JPH1010032A - Method of measuring density of asphalt mixture - Google Patents
Method of measuring density of asphalt mixtureInfo
- Publication number
- JPH1010032A JPH1010032A JP17869996A JP17869996A JPH1010032A JP H1010032 A JPH1010032 A JP H1010032A JP 17869996 A JP17869996 A JP 17869996A JP 17869996 A JP17869996 A JP 17869996A JP H1010032 A JPH1010032 A JP H1010032A
- Authority
- JP
- Japan
- Prior art keywords
- mass
- specimen
- packaged
- state
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010426 asphalt Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 14
- 239000000203 mixture Substances 0.000 title claims description 13
- 229920006280 packaging film Polymers 0.000 claims abstract description 31
- 239000012785 packaging film Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000004806 packaging method and process Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000005484 gravity Effects 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 25
- 230000006837 decompression Effects 0.000 claims description 13
- 239000005022 packaging material Substances 0.000 claims description 6
- 238000001739 density measurement Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 24
- 238000009461 vacuum packaging Methods 0.000 description 16
- 239000012188 paraffin wax Substances 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 238000000605 extraction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、道路や歩道等の舗
装に広く使用されるアスファルト混合物のかさ密度を測
定する測定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the bulk density of an asphalt mixture widely used for pavement such as roads and sidewalks.
【０００２】[0002]
【従来の技術】道路等の舗装の施工には、使用する素材
の性質の評価、素材の組合わせ方の決定、施工現場での
締め固め度をはじめとする状況把握、施工した舗装の管
理などで試験や測定が必要である。また、試験や測定の
結果を一定の尺度で評価するためには同一の試験方法を
用いる必要がある。2. Description of the Related Art In the construction of pavements such as roads, evaluation of properties of materials to be used, determination of combinations of materials, understanding of conditions including compaction degree at construction sites, management of constructed pavements, etc. Requires testing and measurement. In addition, the same test method must be used to evaluate the results of tests and measurements on a certain scale.
【０００３】締め固めたアスファルト混合物の試験には
密度試験とアスファルト抽出試験とがあるので、従来は
同じ位置で密度試験用とアスファルト抽出試験用との少
なくとも２つの供試体を採取する。したがって、従来の
試験においては、まず、舗装現場でボーリング装置等の
機械を使用して所定寸法の供試体を２つ採取し、採取し
た両供試体をシュリンク包装するとともに分類票を添付
する。なお、供試体の大きさは、一般的には直径４イン
チ、重量２５０ｇ以上，５Ｋｇ以下である。そして、こ
れらの供試体を試験場に持ち込んで、一方の供試体を使
用して密度を測定する。[0003] Since tests of the compacted asphalt mixture include a density test and an asphalt extraction test, conventionally, at least two specimens for the density test and the asphalt extraction test are taken at the same position. Therefore, in the conventional test, first, two specimens having a predetermined size are collected on a pavement site using a machine such as a boring device, and both the collected specimens are shrink-wrapped and a classification sheet is attached. In addition, the size of the specimen is generally 4 inches in diameter, 250 g or more and 5 kg or less in weight. Then, these specimens are brought to a test site, and the density is measured using one of the specimens.
【０００４】この測定方法は、空中重量と水中重量との
関係から体積を割り出し、空中重量を体積で除すること
により密度を算出するものである。具体的に説明する
と、供試体を室温の空気中に少なくとも１時間静置した
後、室温において乾燥状態の供試体の空中質量Ａを計測
する。そして、この供試体を常温の水中に約１分間放置
した後、水中重量Ｃを計測する。供試体の表面が緻密で
吸水しない場合には、次の式１により密度ρmを求める
ことができる。なお、ρwは水の密度（≒１ｇ／ｃｍ3）
である。In this measuring method, the volume is determined from the relationship between the weight in the air and the weight in the water, and the density is calculated by dividing the weight in the air by the volume. More specifically, after the specimen is allowed to stand in the air at room temperature for at least one hour, the air mass A of the specimen in a dry state at room temperature is measured. After the specimen is left in water at room temperature for about 1 minute, the weight C in the water is measured. When the surface of the test piece is dense and does not absorb water, the density ρm can be obtained by the following equation 1. Here, ρw is the density of water (≒ 1 g / cm 3 )
It is.
【式１】 (Equation 1)
【０００５】しかし、供試体の表面が滑らかだが吸水す
る場合には、水中重量Ｃを計測した供試体の表面の水分
を柔らかい布等で手早くぬぐい、表乾質量Ｂを計測し
て、次の式２により密度を求める。However, if the surface of the test piece is smooth but absorbs water, the water on the surface of the test piece whose water weight C is measured is quickly wiped off with a soft cloth or the like, and the surface dry mass B is measured. 2. Determine the density by 2.
【式２】 (Equation 2)
【０００６】また、供試体の表面が粗く、間隙も多い場
合には、水の浸入を防ぐために供試体をパラフィンで被
覆してから質量測定する必要がある。パラフィン被覆す
る場合には、供試体を暖めたパラフィン中に浸して、供
試体の全表面にパラフィンの被膜を作る。パラフィンの
被膜は、供試体表面の空隙をすべて封ずるように十分な
厚さとする。被覆した供試体は常温の空気中で３０分間
放冷した後、室温において乾燥重量Ｄを計測する。この
計測方法の場合には、供試体を被覆しているパラフィン
の重量と体積とが加えられているので、密度を算出する
にはパラフィンの体積（Ｄ−Ａ）／Ｆを差し引いて次の
式３により算出する。なお、Ｆはパラフィンの比重であ
る。If the surface of the specimen is rough and there are many gaps, it is necessary to coat the specimen with paraffin and then measure the mass in order to prevent water from entering. In the case of paraffin coating, the specimen is immersed in warm paraffin to form a paraffin coating on the entire surface of the specimen. The paraffin coating should be thick enough to seal any voids on the specimen surface. The coated sample is allowed to cool in air at room temperature for 30 minutes, and then the dry weight D is measured at room temperature. In the case of this measurement method, since the weight and volume of the paraffin coating the specimen are added, the density is calculated by subtracting the paraffin volume (DA) / F to obtain the following equation. Calculated by 3. F is the specific gravity of paraffin.
【式３】 (Equation 3)
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、供試体
をパラフィン被膜で被覆する作業は人手によるので手間
が掛かるし、空隙をすべて封ずる必要があるばかりでな
く均一にすることが望ましいので、作業にはある程度熟
練を要する。また、密度測定後供試体をほかの試験に利
用するためにパラフィン被膜を取り除きたい場合には、
予めタルク（滑石）粉末をまぶしておく必要があり、面
倒である。However, the work of coating the specimen with a paraffin film is labor-intensive because it is performed manually, and it is necessary not only to seal all the voids but also to make them uniform. Requires some skill. Also, if you want to remove the paraffin coating to use the specimen after density measurement for other tests,
It is necessary to apply talc (talc) powder in advance, which is troublesome.
【０００８】そして、道路舗装のアスファルト混合物を
試験する場合には、供試体の数が膨大になるので、パラ
フィン被覆に要する労力だけでも多大である。[0008] When testing an asphalt mixture for road pavement, the number of specimens becomes enormous, so that the labor required for paraffin coating alone is enormous.
【０００９】そこで本発明の目的は、供試体の表面封止
作業を少ない労力で簡単に行えるアスファルト混合物の
密度測定方法を提供しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for measuring the density of an asphalt mixture in which the work for sealing the surface of a specimen can be easily performed with a small amount of labor.
【００１０】[0010]
【課題を解決するための手段】本発明は上記目的を達成
するために提案されたもので、請求項１に記載の密度測
定方法は、アスファルト混合物の供試体を包装フィルム
内に収納した状態で減圧室内に載置し、減圧室内を減圧
して包装フィルム内部の空気を排除し、この減圧状態で
包装フィルムの開口部を密封し、密封後に減圧室内を大
気圧に戻してから供試体を取り出す供試体包装工程と、
包装した供試体の質量を空中で計測する空中質量計測工
程と、包装した供試体を液中に没した状態で供試体の質
量を計測する液中質量計測工程と、を含み、空中質量計
測工程で得られた空中質量と液中質量計測工程で得られ
た液中質量に基づいて密度を算出することを特徴とする
アスファルト混合物の密度測定方法である。Means for Solving the Problems The present invention has been proposed to achieve the above object, and a method for measuring density according to claim 1 is a method for measuring a density of an asphalt mixture in a state where the specimen is contained in a packaging film. It is placed in a decompression chamber, the pressure inside the decompression chamber is reduced to eliminate the air inside the packaging film, the opening of the packaging film is sealed in this decompressed state, and after the sealing, the pressure in the decompression chamber is returned to the atmospheric pressure, and the specimen is taken out Specimen packaging process,
An air mass measurement step of measuring the mass of the packaged specimen in the air, and a liquid mass measurement step of measuring the mass of the specimen with the packaged specimen immersed in the liquid; A density is calculated based on the in-air mass obtained in the above and the in-liquid mass obtained in the in-liquid mass measurement step.
【００１１】請求項２に記載の測定方法は、アスファル
ト混合物の供試体の空中質量を非包装状態で計測する非
包装状態空中質量計測工程と、供試体を包装フィルム内
に収納した状態で減圧室内に載置し、減圧室内を減圧し
て包装材内部の空気を排除し、この減圧状態で包装材の
開口部を密封し、密封後に減圧室内を大気圧に戻してか
ら供試体を取り出す供試体包装工程と、包装した供試体
の質量を空中で計測する包装状態空中質量計測工程と、
包装した供試体を液中に没した状態で供試体の質量を計
測する包装状態液中質量計測工程と、を含み、非包装状
態空中質量計測工程で得られた非包装状態空中重量と包
装状態空中質量計測工程で得られた包装状態空中質量と
液中質量計測工程で得られた包装状態液中質量と包装材
の比重に基づいて密度を算出することを特徴とするアス
ファルト混合物の密度測定方法である。According to a second aspect of the present invention, there is provided a method for measuring an aerial mass of an asphalt mixture specimen in an unwrapped state in an unwrapped state, and a decompression chamber with the specimen stored in a packaging film. The vacuum chamber is decompressed to eliminate the air inside the packaging material, the opening of the packaging material is sealed in this decompressed state, and after the sealing, the vacuum chamber is returned to the atmospheric pressure and the specimen is taken out. A packaging step, a packaged aerial mass measurement step of measuring the mass of the packaged specimen in the air,
Measuring the mass of the test sample in a state where the packaged test sample is submerged in the liquid; and A method for measuring the density of an asphalt mixture, wherein the density is calculated based on the packaged air mass obtained in the air mass measurement process and the specific gravity of the packaging material obtained in the packaged air mass and the liquid mass obtained in the liquid mass measurement process. It is.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。本発明に使用する器具は、真空包
装装置１、はかり２、金網かご３、越流装置４のある容
器５、吊り金具６などである。真空包装装置１は、供試
体１０の大きさに応じた減圧室を備えたものである。は
かり２は、秤量５Ｋｇ以上，感度０．５ｇ以下のものを
使用する。金網かご３は、目の開きが５ｍｍの金網かご
３で、直径，高さとも約２０ｃｍのものであることが望
ましい。容器５は、上記した様に越流装置付きが望まし
く、水位を一定に保ちながら、金網かご３を水中に浸す
ことのできるものであることが測定精度向上のために望
ましい。吊り金具６は、はかり２の計量皿２′の中心か
ら、水中質量を計測するための金網かご３を吊す装置で
ある。Embodiments of the present invention will be described below with reference to the drawings. Instruments used in the present invention are a vacuum packaging apparatus 1, a scale 2, a wire mesh basket 3, a container 5 having an overflow device 4, a hanging metal fitting 6, and the like. The vacuum packaging apparatus 1 is provided with a decompression chamber corresponding to the size of the specimen 10. The scale 2 has a weighing of 5 kg or more and a sensitivity of 0.5 g or less. The wire mesh basket 3 is preferably a wire mesh basket 3 having an opening of 5 mm and having a diameter and a height of about 20 cm. The container 5 is desirably provided with an overflow device as described above, and it is desirable that the wire mesh basket 3 can be immersed in water while maintaining a constant water level in order to improve measurement accuracy. The hanging bracket 6 is a device that suspends the wire mesh basket 3 for measuring underwater mass from the center of the weighing dish 2 ′ of the scale 2.
【００１３】供試体１０は、アスファルト混合物の試験
室で作製したもの、または道路などの舗装体より切り取
ったもの（切取りコアー）で、質量は従来と同様に、２
５０ｇ以上，５Ｋｇ以下とする。なお、道路や歩道など
の長い舗装体から採取する供試体１０は、数量が多いの
で、図１（ｂ）に示すように、採取後直ちにシュリンク
フィルム包装１１を施すとともに、採取地等のデータを
記載した分類票１２を添付することが望ましい。そし
て、この供試体１０を試験室に運び込んで密度を測定す
る。The specimen 10 was prepared in an asphalt mixture test room or cut from a pavement such as a road (cut core).
50 g or more and 5 kg or less. In addition, since the number of the test specimens 10 collected from a long pavement such as a road or a sidewalk is large, as shown in FIG. It is desirable to attach the described classification slip 12. Then, the specimen 10 is carried into a test room and the density is measured.
【００１４】次に、密度測定方法について説明する。ま
ず、図１（Ｃ）に示すように、シュリンク包装１１のフ
ィルムを剥して非包装状態とし、供試体１０を室温の空
気中に少なくとも１時間静置しておく。供試体１０を採
取する際に水に濡れるので、風通しの良い場所で質量変
化がなくなるまで乾燥させる。そしてその後、図１
（ｄ）に示すように、供試体１０を計量皿２′上に載せ
てはかり２に掛けて室温における乾燥状態の供試体１０
の空中質量Ａを計測する（計測する非包装状態空中質量
計測工程）。なお、空中質量Ａは、計測値の重量であ
る。Next, a method of measuring the density will be described. First, as shown in FIG. 1 (C), the film of the shrink wrap 11 is peeled off to leave a non-wrapped state, and the specimen 10 is allowed to stand in air at room temperature for at least one hour. Since the specimen 10 gets wet when it is collected, it is dried in a well-ventilated place until there is no change in mass. And then Figure 1
As shown in (d), the specimen 10 is placed on the weighing dish 2 ', placed on the scale 2, and placed in a dry state at room temperature.
(A non-packed state air mass measurement step of measuring). In addition, the air mass A is the weight of the measured value.
【００１５】非包装状態での空中質量の計測が終了した
ならば、この供試体１０を真空包装装置１で真空パック
する。真空包装装置１は、図２および図３に示すよう
に、食品等を真空パックするための装置と構造が類似し
た装置であり、減圧室として機能する蓋付き耐圧容器１
３と、耐圧容器１３内の空気を吸引して容器１３内を減
圧する真空ポンプ１４と、包装フィルム１５の開口部１
５′を密封するヒートシール機構１６に代表される封止
機構と、これらを制御する制御装置などが主要な部材で
ある。なお、ヒートシール機構１６は、制御装置の制御
により、耐圧容器１３内が所定の真空度に達した後に加
熱部１６′，１６′が袋体の開口部１５′を加熱押圧す
ることにより開口部１５′を溶着して密封するように構
成されている。When the measurement of the air mass in the non-packaged state is completed, the specimen 10 is vacuum-packed by the vacuum packaging apparatus 1. As shown in FIGS. 2 and 3, the vacuum packaging device 1 is a device similar in structure to a device for vacuum-packing foods and the like, and is a pressure-resistant container 1 with a lid that functions as a decompression chamber.
3, a vacuum pump 14 for sucking air from the pressure-resistant container 13 to reduce the pressure in the container 13, and an opening 1 in the packaging film 15.
The main members are a sealing mechanism typified by a heat sealing mechanism 16 for sealing 5 'and a control device for controlling these. Under the control of the control device, the heat sealing mechanism 16 heats and presses the opening 15 ′ of the bag by the heating units 16 ′ and 16 ′ after the inside of the pressure-resistant container 13 reaches a predetermined degree of vacuum. 15 'is welded and hermetically sealed.
【００１６】供試体１０を真空包装する包装フィルム１
５は、ポリエチレン樹脂、ポリナイロン樹脂などの高分
子樹脂製のフィルムであり、酸素や空気等の気体を通過
させない気密性、水分などの液体を通過させない液密
性、容易に破れない強度、外部から内容物を確認できる
透明性などの特性の他に熱溶着性を備えていることが望
ましい。そして、この包装フィルム１５は、一辺に開口
部１５′を有する袋体として予め加工されている。A packaging film 1 for vacuum packaging the specimen 10
Reference numeral 5 denotes a film made of a polymer resin such as a polyethylene resin or a polynylon resin, which is airtight so that gas such as oxygen or air does not pass, liquid tight that does not allow liquid such as moisture to pass, strength that is not easily broken, and external strength. It is desirable to have a heat welding property in addition to properties such as transparency from which the contents can be confirmed. The packaging film 15 is processed in advance as a bag having an opening 15 'on one side.
【００１７】上記した構成から成る真空包装装置１を使
用して供試体１０を包装フィルム１５で真空包装する供
試体包装工程について説明する。まず、耐圧容器１３の
蓋１３′を開いて、供試体１０を包装フィルム１５内に
収納した状態で耐圧容器１３の底面上に載置する。この
場合、本実施形態では包装袋体の開口部１５′をヒート
シールによって密封するので、図３に示すように、袋体
の開口部１５′をヒートシール機構１６の加熱部１
６′，１６′の間に位置するように位置調整してセット
する。包装袋体１５のセットが終了したならば蓋１３′
を閉じる。A specimen packaging step of vacuum packaging the specimen 10 with the packaging film 15 using the vacuum packaging apparatus 1 having the above-described configuration will be described. First, the lid 13 ′ of the pressure-resistant container 13 is opened, and the specimen 10 is placed on the bottom surface of the pressure-resistant container 13 while being stored in the packaging film 15. In this case, in this embodiment, the opening 15 ′ of the packaging bag is sealed by heat sealing, so that the opening 15 ′ of the bag is heated by the heating unit 1 of the heat sealing mechanism 16 as shown in FIG.
The position is adjusted and set so that it is located between 6 'and 16'. When the setting of the packaging bag body 15 is completed, the lid 13 '
Close.
【００１８】蓋１３′が閉じられると、この蓋１３′の
閉位置を検出したスイッチからの信号に基づいて制御装
置が真空ポンプ１４を作動せしめ、耐圧容器１３内の空
気を外部に排除し始める。したがって、耐圧容器１３内
の気圧が次第に低下するとともに、包装袋体１５内の空
気も排除される。そして、耐圧容器１３内の気圧が所定
の真空度に達すると、ヒートシール機構１６の駆動源１
７が作動して加熱部１６′を移動し、袋体１５の開口部
１５′を加熱押圧する。したがって、包装袋体１５の開
口部１５′は熱溶着（ヒートシール）されて密封され
る。When the lid 13 'is closed, the control unit activates the vacuum pump 14 based on a signal from the switch which has detected the closed position of the lid 13', and starts removing the air in the pressure-resistant container 13 to the outside. . Therefore, the pressure inside the pressure-resistant container 13 gradually decreases, and the air inside the packaging bag body 15 is also eliminated. When the pressure in the pressure-resistant container 13 reaches a predetermined degree of vacuum, the driving source 1
7 is actuated to move the heating section 16 'to heat and press the opening 15' of the bag body 15. Therefore, the opening 15 'of the packaging bag body 15 is sealed by heat welding (heat sealing).
【００１９】耐圧容器１３内の真空度は、使用する包装
フィルム１５の厚さや強度などに応じて１０乃至３００
ｍｍ／Ｈｇの範囲で設定できるが、約３０ｍｍ／Ｈｇが
好ましい。The degree of vacuum in the pressure-resistant container 13 ranges from 10 to 300 in accordance with the thickness and strength of the packaging film 15 to be used.
Although it can be set in the range of mm / Hg, about 30 mm / Hg is preferable.
【００２０】このようにして、供試体１０を包装袋体１
５内に収納した状態で包装袋体１５の開口部１５′が密
封されると、制御装置が開放弁を開いて耐圧容器１３内
部に大気を導入させる。したがって、耐圧容器１３内が
大気圧に戻る。In this manner, the specimen 10 is placed in the packaging bag 1
When the opening 15 ′ of the packaging bag body 15 is sealed in a state of being housed in the container 5, the control device opens the opening valve to introduce the atmosphere into the pressure-resistant container 13. Therefore, the pressure inside the pressure vessel 13 returns to the atmospheric pressure.
【００２１】耐圧容器１３内が大気圧に戻ると、蓋１
３′を開いて真空包装した供試体１０を取り出すことが
でき、この時、包装袋体１５は大気圧に押し潰されて供
試体１０の表面に密着している。したがって、供試体１
０を真空包装した包装袋体１５は、ヒートシールした部
分が僅かに耳片状に突出するが、円柱状の供試体１０と
ほぼ同じ体積となる。When the pressure inside the pressure vessel 13 returns to the atmospheric pressure, the lid 1
The specimen 10 vacuum-packaged can be taken out by opening 3 '. At this time, the packaging bag 15 is crushed to the atmospheric pressure and is in close contact with the surface of the specimen 10. Therefore, specimen 1
The packaging bag body 15 in which the package 0 is vacuum-packed has a heat-sealed portion slightly protruding in the shape of an ear piece, but has approximately the same volume as the cylindrical specimen 10.
【００２２】この様にして供試体包装工程が終了したな
らば、図１（ｇ）に示すように、包装した供試体１０
を、はかり２を使用して質量を空中で計測する（包装状
態空中質量計測工程）。このときの計測値が包装状態空
中重量Ｄ′である。When the specimen packaging step is completed in this way, as shown in FIG.
Is measured in the air using the balance 2 (packaged aerial mass measurement step). The measured value at this time is the packaged aerial weight D '.
【００２３】次に、金網かご３に入れたまま供試体１０
を容器５内の常温の水中に約１分間放置した後、包装し
た供試体１０を水中に没した状態で供試体１０の質量を
計測する（包装状態液中質量計測工程）。このときの計
測値から金網かご３の重量と吊り金具６を差し引いた重
量が包装状態液中重量Ｅ′である。Next, the specimen 10 is kept in the wire mesh basket 3.
Is left in normal-temperature water in the container 5 for about 1 minute, and then the weight of the test specimen 10 is measured in a state where the packaged test specimen 10 is submerged in water (a packaged liquid mass in liquid measuring step). The weight obtained by subtracting the weight of the wire mesh basket 3 and the hanging hardware 6 from the measured value at this time is the weight E 'in the packaged liquid.
【００２４】この様にして計測を終了して、非包装状態
空中質量計測工程で得られた非包装状態空中重量Ａと包
装状態空中質量計測工程で得られた包装状態空中質量
Ｄ′と液中質量計測工程で得られた包装状態液中質量と
が得られたならば、予め判明している包装袋体１５の比
重と水の比重と上記各質量（重量）に基づいて供試体１
０のかさ密度を算出することができる。After the measurement is completed in this way, the unpacked air weight A obtained in the unpacked aerial mass measuring step, the packed air mass D 'obtained in the packed aerial mass measuring step, and the If the mass in the packaged state liquid obtained in the mass measuring step is obtained, the specimen 1 is determined based on the specific gravity of the packaging bag body 15, the specific gravity of water, and the above-mentioned respective masses (weights) which are known in advance.
A bulk density of zero can be calculated.
【００２５】この場合、供試体１０を包装袋体１５によ
り包装すると、供試体１０の全表面を被覆している包装
袋体１５の分だけ体積が増加するので、この分の体積を
補正すると高い精度でかさ密度を算出することができ
る。包装袋体１５の重量は、別個に重量を計測してもよ
いが、包装状態空中質量Ｄから非包装状態空中重量Ａを
差し引いたＤ′−Ａにより算出することができる。ま
た、包装袋体１５の比重は予め判明したＦ′である。し
たがって、包装した状態おける包装袋体１５自体の体積
は、（Ｄ′−Ａ）／Ｆ′により算出することができる。
したがって、供試体１０のかさ密度は式４により正確に
算出することができる。In this case, when the specimen 10 is packaged in the packaging bag 15, the volume is increased by the amount of the packaging bag 15 covering the entire surface of the specimen 10, and it is high to correct the volume. Bulk density can be calculated with accuracy. Although the weight of the packaging bag body 15 may be measured separately, it can be calculated by D'-A obtained by subtracting the unpacked aerial weight A from the packed aerial mass D. The specific gravity of the packaging bag body 15 is F 'which has been found in advance. Therefore, the volume of the packaging bag 15 itself in the packaged state can be calculated by (D'-A) / F '.
Therefore, the bulk density of the specimen 10 can be accurately calculated by the equation (4).
【式４】 (Equation 4)
【００２６】そして、密度測定が終了した供試体１０の
包装を剥すと、この供試体１０をアスファルト抽出試験
にそのまま使用することができる。なお、前記した説明
では非包装状態空中質量計測工程を最初の工程として説
明したが、この工程は包装状態液中質量計測工程が終了
した後に包装フィルム１５を剥して行ってもよい。ま
た、本願中、質量と重量とは同意である。Then, when the packaging of the specimen 10 whose density measurement has been completed is peeled off, the specimen 10 can be used as it is in the asphalt extraction test. In the above description, the non-packaged aerial mass measurement step is described as the first step. However, this step may be performed by peeling off the packaging film 15 after the packaged liquid mass measurement step is completed. Further, in the present application, mass and weight are synonymous.
【００２７】以上説明した測定方法は、供試体１０を包
装する包装フィルム１５による体積増加までを厳密に考
慮しているので、正確なかさ密度を得ることができる。
しかしながら、包装フィルム１５による体積増加は、包
装フィルム１５の厚さがミクロン単位であり、しかも真
空包装による包装であるために包装フィルム１５は供試
体１０の表面に密着しているので極く僅かである。ま
た、薄くて丈夫な包装フィルム１５を使用してヒートシ
ール部分も最小限に抑えると、包装フィルム１５の重量
自体も極く僅かである。In the measurement method described above, since the increase in volume due to the packaging film 15 for packaging the specimen 10 is strictly considered, an accurate bulk density can be obtained.
However, the increase in the volume due to the packaging film 15 is very small because the thickness of the packaging film 15 is on the order of microns, and since the packaging film 15 is packaged by vacuum packaging, the packaging film 15 is in close contact with the surface of the specimen 10. is there. Also, if the heat-sealed portion is minimized using the thin and durable packaging film 15, the weight itself of the packaging film 15 is extremely small.
【００２８】このため、前記と同様に、供試体１０を包
装フィルム１５内に収納した状態で減圧室内に載置し、
減圧室内を減圧して包装フィルム１５内部の空気を排除
し、この減圧状態で包装フィルム１５の開口部１５′を
密封し、密封後に減圧室内を大気圧に戻してから供試体
１０を取り出す供試体包装工程と、包装した供試体１０
の質量を空中で計測する空中質量計測工程と、包装した
供試体１０を水中に没した状態で供試体１０の質量を計
測する液中質量計測工程とを行い、空中質量計測工程で
得られた空中質量Ｄ′と液中質量計測工程で得られた液
中質量Ｅ′に基づいて密度を算出するしてもよい。即
ち、この場合には、かさ密度ρm＝Ｄ′×ρw÷（Ｄ′−
Ｅ）により算出することができる。For this reason, in the same manner as described above, the specimen 10 is placed in a decompression chamber while being stored in the packaging film 15,
The air inside the packaging film 15 is eliminated by reducing the pressure in the decompression chamber, and the opening 15 ′ of the packaging film 15 is sealed in this decompressed state. Packaging process and packaged specimen 10
An air mass measurement step of measuring the mass of the specimen 10 in the air and a submerged mass measurement step of measuring the mass of the specimen 10 while the packaged specimen 10 is submerged in water were obtained in the air mass measurement step. The density may be calculated based on the air mass D 'and the in-liquid mass E' obtained in the in-liquid mass measuring step. That is, in this case, the bulk density ρm = D ′ × ρw ÷ (D′−
E).
【００２９】なお、前記した実施形態では、液中質量を
計測する際に水を使用したが、液中質量と空中質量との
差により浮力を、そして液の比重で除して体積を算出
し、空中質量を体積で除してかさ密度を算出するのであ
るから、使用する液は水に限らない。しかしながら、水
を使用すれば、安全であり、入手し易く、また、摂氏４
度で比重が「１」であるので計算も容易なので、水を使
用することが好ましい。In the above-described embodiment, water is used when measuring the mass in the liquid. However, the buoyancy is calculated by the difference between the mass in the liquid and the mass in the air, and the volume is calculated by dividing by the specific gravity of the liquid. Since the bulk density is calculated by dividing the mass in the air by the volume, the liquid used is not limited to water. However, the use of water is safe, readily available, and
It is preferable to use water because the specific gravity is "1" and the calculation is easy.
【００３０】また、供試体１０は、前記実施形態では舗
装道路からボーリング装置で採取した円柱形であるが、
この形状に限定されるものでなく、また、大きさなど
も、測定に適したものであればよい。特に、試験室で作
製する場合には形状を自由に選択できるので、真空包装
し易い形状、例えば偏平形状にしてもよい。In the above embodiment, the specimen 10 has a cylindrical shape collected from a paved road by a boring device.
The shape is not limited to this, and the size and the like may be any as long as they are suitable for measurement. In particular, when manufacturing in a test room, the shape can be freely selected, so that the shape may be easily vacuum-packaged, for example, a flat shape.
【００３１】[0031]
【発明の効果】以上説明したように本発明によれば、供
試体をパラフィン被覆する面倒な手作業が必要なくな
り、これに代わって包装フィルムで包装するだけでよ
い。そして、包装フィルムで包装するには真空包装装置
を使用することができるので、真空包装も短時間で簡単
に行うことができ、これにより測定作業の能率を高め、
迅速化を図ることができ、単位時間当たりの処理数量を
増加することができる。したがって、アスファルト混合
物の密度測定の作業効率を著しく高めることができる。As described above, according to the present invention, the troublesome manual work of coating the specimen with paraffin is not required, and instead, it is only necessary to package the specimen with a packaging film. And since vacuum packaging equipment can be used for packaging with a packaging film, vacuum packaging can also be performed easily in a short time, thereby improving the efficiency of measurement work,
Speeding up can be achieved, and the processing quantity per unit time can be increased. Therefore, the working efficiency of the density measurement of the asphalt mixture can be significantly increased.
【００３２】また、包装フィルムにより真空包装するの
で、水などの液が供試体の内部に浸入することを確実に
防止することができる。したがって、従来のパラフィン
被覆に比較して、測定値の精度を高めることができる。Further, since the package is vacuum-packed with the packaging film, it is possible to reliably prevent liquid such as water from entering the inside of the specimen. Therefore, the accuracy of the measured value can be improved as compared with the conventional paraffin coating.
【００３３】さらに、供試体から包装フィルムを剥す作
業も容易であり、剥した後にフィルムが残ることもない
ので、密度測定が終了した供試体をアスファルト抽出試
験に使用しても何等支障がないし、勿論滑石粉末を予め
まぶしておく手間も不要である。このため、従来は同じ
位置で２つの供試体を採取していたが、これを１つ採取
すれば足りることになり、供試体の採取の労力が半減す
るばかりでなく、供試体を保管しておく場所も半減す
る。したがって、労力の軽減と管理スペースの有効利用
を同時に果たすことができる。Further, the work of peeling the packaging film from the specimen is easy, and the film does not remain after peeling, so that there is no problem even if the specimen whose density has been measured is used for the asphalt extraction test. Needless to say, there is no need to previously coat talc powder. For this reason, two specimens were conventionally collected at the same position, but it is sufficient to collect one specimen, which not only reduces the labor of collecting the specimen by half, but also saves the specimen. The place to put is halved. Therefore, it is possible to simultaneously reduce labor and effectively use the management space.
【図１】密度測定の各工程を示す概略説明図であり、
（ａ）は供試体の斜視図、（ｂ）はシュリンク包装した
供試体に分類票を添付する状態を示す斜視図、（ｃ）は
シュリンク包装を剥した状態の供試体の斜視図、（ｄ）
は非包装状態空中質量をはかりを使用して計測している
状態の斜視図、（ｅ）は供試体を包装袋体に入れる状態
を示す斜視図、（ｆ）は真空包装装置に入れる状態を示
す真空包装装置の側面図、（ｇ）は包装状態空中質量を
はかりを使用して計測している状態の斜視図、（ｈ）は
供試体を水に浸して包装状態水中質量を計測している状
態の正面図である。FIG. 1 is a schematic explanatory view showing each step of density measurement,
(A) is a perspective view of a specimen, (b) is a perspective view showing a state where a classification tag is attached to a shrink-wrapped specimen, (c) is a perspective view of a specimen with a shrink package removed, (d) )
Is a perspective view showing a state in which an aerial mass is measured using a scale in a non-packaged state, (e) is a perspective view showing a state in which a specimen is put in a packaging bag, and (f) is a state in which it is put in a vacuum packaging apparatus. The side view of the vacuum packaging apparatus shown, (g) is a perspective view of a state in which the packaged aerial mass is measured using a scale, and (h) is a sample in which the specimen is immersed in water to measure the mass of the packaged underwater. FIG.
【図２】蓋を開いた状態における真空包装装置の斜視図
である。FIG. 2 is a perspective view of the vacuum packaging device in a state where a lid is opened.
【図３】真空包装装置の断面図である。FIG. 3 is a sectional view of a vacuum packaging device.
１ 真空包装装置 ２ はかり ３ 金網かご ４ 越流装置 ５ 容器 ６ 吊り金具 １０ 供試体 １１ シュリンク包装 １２ 分類票 １３ 耐圧容器 １３′ 蓋 １４ 真空ポンプ １５ 包装フィルム（包装袋体） １５′ 開口部 １６ ヒートシール機構 １６′ 加熱部 １７ 駆動源 DESCRIPTION OF SYMBOLS 1 Vacuum packaging device 2 Scale 3 Wire mesh basket 4 Overflow device 5 Container 6 Hanging fitting 10 Specimen 11 Shrink packaging 12 Classification card 13 Pressure-resistant container 13 'Lid 14 Vacuum pump 15 Packaging film (packing bag) 15' Opening 16 Heat Sealing mechanism 16 'Heating unit 17 Drive source
Claims (2)
ルム内に収納した状態で減圧室内に載置し、減圧室内を
減圧して包装フィルム内部の空気を排除し、この減圧状
態で包装フィルムの開口部を密封し、密封後に減圧室内
を大気圧に戻してから供試体を取り出す供試体包装工程
と、 包装した供試体の質量を空中で計測する空中質量計測工
程と、 包装した供試体を液中に没した状態で供試体の質量を計
測する液中質量計測工程と、を含み、空中質量計測工程
で得られた空中質量と液中質量計測工程で得られた液中
質量に基づいて密度を算出することを特徴とするアスフ
ァルト混合物の密度測定方法。1. A sample of an asphalt mixture is placed in a decompression chamber with the specimen stored in a packaging film, and the decompression chamber is depressurized to eliminate air inside the packaging film. After the sealing, the decompression chamber is returned to the atmospheric pressure and the specimen is taken out, and then the specimen is taken out.The aerial mass measurement step of measuring the mass of the packaged specimen in the air is performed. Calculating the density based on the aerial mass obtained in the aerial mass measurement step and the in-liquid mass obtained in the submerged mass measurement step, including a submerged mass measurement step of measuring the mass of the specimen in the immersed state A method for measuring the density of an asphalt mixture.
を非包装状態で計測する非包装状態空中質量計測工程
と、 供試体を包装フィルム内に収納した状態で減圧室内に載
置し、減圧室内を減圧して包装材内部の空気を排除し、
この減圧状態で包装材の開口部を密封し、密封後に減圧
室内を大気圧に戻してから供試体を取り出す供試体包装
工程と、 包装した供試体の質量を空中で計測する包装状態空中質
量計測工程と、 包装した供試体を液中に没した状態で供試体の質量を計
測する包装状態液中質量計測工程と、を含み、非包装状
態空中質量計測工程で得られた非包装状態空中重量と包
装状態空中質量計測工程で得られた包装状態空中質量と
液中質量計測工程で得られた包装状態液中質量と包装材
の比重に基づいて密度を算出することを特徴とするアス
ファルト混合物の密度測定方法。2. A non-packaged aerial mass measuring step of measuring the aerial mass of the asphalt mixture specimen in an unwrapped state; placing the specimen in a packaging film in a decompression chamber; Reduce the pressure to eliminate air inside the packaging material,
In this decompressed state, the opening of the packaging material is sealed, and after sealing, the decompression chamber is returned to the atmospheric pressure and the specimen is taken out, and the mass of the packed specimen is measured in the air. A non-packaged aerial weight obtained in the non-packaged aerial mass measurement step, comprising: a process, and a packaged-state liquid mass measurement step of measuring the mass of the test sample in a state where the packaged sample is submerged in the liquid. And calculating the density based on the specific gravity of the packaging material obtained in the packaging state aerial mass and the packaging state aerial mass obtained in the aerial mass measuring step and the packaging state obtained in the liquid mass measuring step. Density measurement method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17869996A JPH1010032A (en) | 1996-06-20 | 1996-06-20 | Method of measuring density of asphalt mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17869996A JPH1010032A (en) | 1996-06-20 | 1996-06-20 | Method of measuring density of asphalt mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1010032A true JPH1010032A (en) | 1998-01-16 |
Family
ID=16053015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17869996A Pending JPH1010032A (en) | 1996-06-20 | 1996-06-20 | Method of measuring density of asphalt mixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1010032A (en) |
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| US6615643B2 (en) | 2000-10-13 | 2003-09-09 | Instrotek, Inc. | Systems and methods for determining the absorption and specific gravity properties of compacted and loose material including fine and coarse aggregates |
| US6629459B2 (en) | 1999-06-25 | 2003-10-07 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| US6684684B2 (en) | 2000-05-30 | 2004-02-03 | Instrotek, Inc. | Systems and methods for determining the porosity and/or effective air void content of compacted material |
| CN104330334A (en) * | 2014-11-25 | 2015-02-04 | 中国建材检验认证集团股份有限公司 | Testing method for testing density of coating |
| KR20160031628A (en) * | 2014-09-12 | 2016-03-23 | 조선대학교산학협력단 | Regeneration device of waste using variable type screw for a hot in surface recycling asphalt packing method |
| CN105579827A (en) * | 2013-10-18 | 2016-05-11 | 株式会社钟化 | Bulk-density measuring device for pre-expanded particles and method for manufacturing pre-expanded particles |
| CN111470196A (en) * | 2020-05-01 | 2020-07-31 | 姚迎黎 | A kind of anti-cooling asphalt measuring method |
| CN114018759A (en) * | 2021-11-17 | 2022-02-08 | 镇江新区建设工程质量中心试验室 | Auxiliary device and auxiliary method for measuring asphalt density |
| CN116519538A (en) * | 2023-05-08 | 2023-08-01 | 华运通达科技集团有限公司 | Density meter for automatically testing asphalt mixture and application method thereof |
| CN117517163A (en) * | 2023-10-30 | 2024-02-06 | 辽宁省水利水电科学研究院有限责任公司 | A water-filled impregnated closed ecological grid structure void rate detection method |
-
1996
- 1996-06-20 JP JP17869996A patent/JPH1010032A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6817243B2 (en) | 1999-06-25 | 2004-11-16 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| US6321589B1 (en) | 1999-06-25 | 2001-11-27 | Instrotek, Inc. | Methods and apparatus for sealing a porous material sample for density determination using water displacement methods and associated surface conformal resilient compressible bags |
| WO2001001108A1 (en) * | 1999-06-25 | 2001-01-04 | Instro Tek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| US6629459B2 (en) | 1999-06-25 | 2003-10-07 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| US6668647B1 (en) | 1999-06-25 | 2003-12-30 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| AU772034B2 (en) * | 1999-06-25 | 2004-04-08 | Instrotek, Inc. | Methods and apparatus for sealing and analyzing material samples including uncompacted bituminous samples according to water displacement testing methods |
| US6684684B2 (en) | 2000-05-30 | 2004-02-03 | Instrotek, Inc. | Systems and methods for determining the porosity and/or effective air void content of compacted material |
| US6817230B2 (en) | 2000-10-13 | 2004-11-16 | Instrotek, Inc. | Systems and methods for determining the absorption and specific gravity properties of compacted and loose material including fine and coarse aggregates |
| US6615643B2 (en) | 2000-10-13 | 2003-09-09 | Instrotek, Inc. | Systems and methods for determining the absorption and specific gravity properties of compacted and loose material including fine and coarse aggregates |
| CN105579827A (en) * | 2013-10-18 | 2016-05-11 | 株式会社钟化 | Bulk-density measuring device for pre-expanded particles and method for manufacturing pre-expanded particles |
| KR20160031628A (en) * | 2014-09-12 | 2016-03-23 | 조선대학교산학협력단 | Regeneration device of waste using variable type screw for a hot in surface recycling asphalt packing method |
| KR101633080B1 (en) * | 2014-09-12 | 2016-06-24 | 조선대학교산학협력단 | Regeneration device of waste using variable type screw for a hot in surface recycling asphalt packing method |
| CN104330334A (en) * | 2014-11-25 | 2015-02-04 | 中国建材检验认证集团股份有限公司 | Testing method for testing density of coating |
| CN111470196A (en) * | 2020-05-01 | 2020-07-31 | 姚迎黎 | A kind of anti-cooling asphalt measuring method |
| CN111470196B (en) * | 2020-05-01 | 2022-12-06 | 广东德茂建设工程有限公司 | Anti-cooling asphalt metering method |
| CN114018759A (en) * | 2021-11-17 | 2022-02-08 | 镇江新区建设工程质量中心试验室 | Auxiliary device and auxiliary method for measuring asphalt density |
| CN116519538A (en) * | 2023-05-08 | 2023-08-01 | 华运通达科技集团有限公司 | Density meter for automatically testing asphalt mixture and application method thereof |
| CN117517163A (en) * | 2023-10-30 | 2024-02-06 | 辽宁省水利水电科学研究院有限责任公司 | A water-filled impregnated closed ecological grid structure void rate detection method |
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