JPH0218316B2 - - Google Patents
Info
- Publication number
- JPH0218316B2 JPH0218316B2 JP60056049A JP5604985A JPH0218316B2 JP H0218316 B2 JPH0218316 B2 JP H0218316B2 JP 60056049 A JP60056049 A JP 60056049A JP 5604985 A JP5604985 A JP 5604985A JP H0218316 B2 JPH0218316 B2 JP H0218316B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- strength
- products
- product
- sulfate
- 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.)
- Expired - Lifetime
Links
Landscapes
- Aftertreatments Of Artificial And Natural Stones (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は建材その他に広い用途を有するセメン
ト板、石綿セメント板その他これに類するセメン
ト製品の強度を増大強化せしめる方法に係るもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for increasing and strengthening the strength of cement boards, asbestos cement boards, and similar cement products that have a wide range of uses including building materials and other uses.
（従来の技術及び発明が解決しようとする問題
点）
各種組成のセメント板、石綿セメント板等のセ
メント製品は、時間の経過と共に次第に表面の炭
酸化等により強度が低下するので、一度水和硬化
したセメント製品の強度を増大させることは従来
困難とされていた。本発明はかかるセメント製品
の強度を増大強化させたいとの要望に応える方法
を提供するもので、その詳細は以下に説明すると
おりである。(Problems to be solved by the prior art and the invention) Cement products such as cement boards of various compositions and asbestos cement boards gradually lose their strength over time due to surface carbonation, etc. In the past, it was considered difficult to increase the strength of cement products. The present invention provides a method to meet the desire to increase and strengthen the strength of such cement products, and the details thereof are as described below.
（問題を解決するための手段及び作用、効果）
セメント（普通ポルトランドセメント、早強ポ
ルトランドセメント、超早強ポルトランドセメン
ト、中庸熱ポルトランドセメント等）は一度水和
硬化してしまうと約30日でその最高強度の80〜90
％に達し、その後はその強度を維持するが、前述
の如く時間の経過と共に次第に表面の炭酸化
（Ca（OH）2＋CO2→CaCO3＋H2O）等によつて強
度の低下を起こすことは避け難いこととされてい
た。然るに本発明は一度水和硬化したセメント製
品を硫酸塩水溶液に浸漬することにより強度を増
大せしめることに成功したものである。(Means, actions, and effects for solving the problem) Once cement (ordinary Portland cement, early strength Portland cement, ultra early strength Portland cement, moderate heat Portland cement, etc.) hardens by hydration, it takes about 30 days to harden. Maximum strength 80-90
%, and thereafter maintains its strength, but as mentioned above, the strength gradually decreases over time due to surface carbonation (Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O), etc. was considered unavoidable. However, the present invention has succeeded in increasing the strength of cement products that have been hydrated and hardened by immersing them in an aqueous sulfate solution.
セメント硬化体はこれを硫酸塩水溶液に長期間
浸漬させると、石膏やエトリンガイトを生成する
ことは知られている。 It is known that when a hardened cement body is immersed in an aqueous sulfate solution for a long period of time, gypsum and ettringite are generated.
Ca（OH）2＋NaSO4・10H2O→CaSO4・2H2O＋2NaOH＋8H2
O
3CaO＋Al2O3・12H2O＋３（CaSO4・2H2O）＋13H2O→3CaO
・Al2O3・3CaSO4・31H2O
又アルカリがセメントの硬化促進の触媒となる
ことも知られている。 Ca(OH) 2 +NaSO 4・10H 2 O→CaSO 4・2H 2 O＋2NaOH＋8H 2
O 3CaO + Al 2 O 3・12H 2 O+3 (CaSO 4・2H 2 O) + 13H 2 O → 3CaO
・Al 2 O 3・3CaSO 4・31H 2 O It is also known that alkali acts as a catalyst to accelerate the hardening of cement.
本発明はかかる事実に着目し、これをセメント
製品の強化に利用したもので、石綿セメント板そ
の他の各種のセメント製品を質量濃度20％以下の
硫酸塩水溶液中に浸漬することにより製品の強度
を増大せしめることに成功したものである。以下
これを詳細に説明する。 The present invention focuses on this fact and utilizes this fact to strengthen cement products.The present invention improves the strength of asbestos cement boards and other various cement products by immersing them in an aqueous sulfate solution with a mass concentration of 20% or less. It was successfully increased. This will be explained in detail below.
本発明においては水和硬化したセメント製品を
質量濃度20％以下の硫酸塩水溶液中に浸漬するこ
とにより製品の表面及び内部の空隙が石膏やエト
リンガイトで充填され、これによつて製品の強度
が増大されるものである。そして硫酸塩の濃度は
後記実施例に示すとおり１％程度でも有効である
ことが判明した。（なお20％は概ね飽和濃度であ
る。）又浸漬期間は概ね２週間程度までであり、
それ以上浸漬させると石膏やエトリンガイトの生
成による結晶圧によつて周囲の組織が破壊され反
つて強度の低下を招く。更に石膏とエトリンガイ
トの製品の空隙を充填するまでの間に硫酸塩のア
ルカリ分がセメント製品中の未水和分の水和を促
進することも製品の強度増大に寄与するものと認
められる。 In the present invention, by immersing a hydrated cement product in a sulfate aqueous solution with a mass concentration of 20% or less, the surface and internal voids of the product are filled with gypsum and ettringite, thereby increasing the strength of the product. It is something that will be done. It was also found that a concentration of sulfate of about 1% is effective as shown in Examples below. (Note that 20% is approximately the saturation concentration.) Also, the immersion period is approximately 2 weeks.
If it is immersed for any longer than that, the surrounding structure will be destroyed by the crystal pressure caused by the formation of gypsum and ettringite, causing warping and a decrease in strength. Furthermore, it is recognized that the alkaline content of the sulfate promotes the hydration of unhydrated components in the cement product before filling the voids in the gypsum and ettringite product, which also contributes to increasing the strength of the product.
次に硫酸塩水溶液の液温は概ね15〜40℃程度が
望ましく、通常20℃前後が適当である。液温が15
℃以下に低下すると漸次強度増大の効果は現われ
にくくなり、又適度の加熱によつて効果は促進さ
れるが、40℃以上になると石膏やエトリンガイト
の生成による浸食が進んで強度は低下する。 Next, the temperature of the sulfate aqueous solution is preferably about 15 to 40°C, and usually about 20°C. Liquid temperature is 15
When the temperature drops below 40°C, the effect of gradual strength increase becomes less apparent, and the effect is promoted by moderate heating, but when the temperature rises above 40°C, erosion due to the formation of gypsum and ettringite progresses, and the strength decreases.
上述の如く本発明はセメント製品を濃度20％以
下の硫酸塩水溶液中に適当な液温及び期間、浸漬
することにより製品の強度を増大せしめることを
可能にしたものである。 As described above, the present invention makes it possible to increase the strength of cement products by immersing them in an aqueous sulfate solution with a concentration of 20% or less at an appropriate temperature and for a suitable period of time.
（実施例）
(1) 普通ポルトランドセメント（以下同じ）100
部、石綿20部に水を加えて混練しモルデイング
により石綿セメント板（長さ20cm、巾15cm、厚
さ６mm）を作成した。これを１ケ月間自然養生
した後、10％の硫酸ナトリウム水溶液（液温20
℃）に14日間浸漬した。製品の曲げ強度（Kg/
cm2）は次のとおりである。(Example) (1) Ordinary Portland cement (same below) 100
An asbestos cement board (length 20 cm, width 15 cm, thickness 6 mm) was prepared by mixing and kneading 20 parts of asbestos with water. After natural curing for one month, a 10% sodium sulfate aqueous solution (liquid temperature 20
℃) for 14 days. Product bending strength (Kg/
cm 2 ) is as follows.
自然養生後 250
溶液浸漬後 295
(2) セメント100部、石綿20部、パルプ３部を水
で混練し(1)と同様に板を作成した。２ケ月間自
然養生した後、１％の硫酸マグネシウム水溶液
に14日間浸漬した。製品の曲げ強度は次のとお
りである。 After natural curing 250 After soaking in solution 295 (2) 100 parts of cement, 20 parts of asbestos, and 3 parts of pulp were kneaded with water and a board was prepared in the same manner as in (1). After natural curing for 2 months, it was immersed in a 1% aqueous magnesium sulfate solution for 14 days. The bending strength of the product is as follows.
自然養生後 220
溶液浸漬後 231
(3) セメント100部、砂20部を水で混練しモルデ
イング成型した板を１ケ月間自然養生後、20％
の硫酸ナトリウム水溶液に10日間浸漬した。製
品の曲げ強度は次のとおりである。 After natural curing 220 After soaking in solution 231 (3) After 1 month of natural curing of a board made by mixing 100 parts of cement and 20 parts of sand with water and molding it, 20%
It was immersed in an aqueous solution of sodium sulfate for 10 days. The bending strength of the product is as follows.
自然養生後 170
溶液浸漬後 195
以上実施例の数列を示したが本発明は各種組成
のセメント製品の強化に役立つものである。又本
発明は養生完了直後の製品だけでなく、例えば材
令２ケ月程度の製品にも適用しうることは、該材
令の市販押出成型セメント板の曲げ強度を280か
ら337まで高め得た実験結果からも、これを認め
ることができる。 After Natural Curing 170 After Soaking in Solution 195 Although a series of examples have been presented above, the present invention is useful for strengthening cement products of various compositions. Furthermore, the present invention can be applied not only to products immediately after curing, but also to products that are about 2 months old, for example, based on an experiment in which the bending strength of a commercially available extruded cement board of this age could be increased from 280 to 337. This can be confirmed from the results.
Claims (1)
品を質量濃度20％以下の硫酸塩水溶液中に浸漬す
ることを特徴とするセメント製品の強化方法。1. A method for strengthening cement products, which comprises immersing cement products such as cement boards and asbestos cement boards in a sulfate aqueous solution with a mass concentration of 20% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5604985A JPS61215277A (en) | 1985-03-22 | 1985-03-22 | Enhancement for cement product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5604985A JPS61215277A (en) | 1985-03-22 | 1985-03-22 | Enhancement for cement product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61215277A JPS61215277A (en) | 1986-09-25 |
| JPH0218316B2 true JPH0218316B2 (en) | 1990-04-25 |
Family
ID=13016226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5604985A Granted JPS61215277A (en) | 1985-03-22 | 1985-03-22 | Enhancement for cement product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61215277A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0320913U (en) * | 1989-07-10 | 1991-02-28 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49106521A (en) * | 1973-02-10 | 1974-10-09 |
-
1985
- 1985-03-22 JP JP5604985A patent/JPS61215277A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0320913U (en) * | 1989-07-10 | 1991-02-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61215277A (en) | 1986-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS59227965A (en) | Curable adhesive composition | |
| US4264368A (en) | Admixtures and method for accelerating the setting of portland cement compositions | |
| ES396905A1 (en) | Building construction | |
| DE2727026A1 (en) | PROCESS FOR ACCELERATING THE CURING AND INCREASING THE STRENGTH OF CEMENTS | |
| JPH0218316B2 (en) | ||
| JPH01298050A (en) | Flash setting agent for cement | |
| KR102673681B1 (en) | Reactive control accelerating admixture for blast furnace slag-based non-cement and blast furnace slag-based non-cement using the same | |
| JPS5827833B2 (en) | Nanjiyakujibannoanteikashiyorikohou | |
| SU1740350A1 (en) | Method of manufacturing plaster construction products | |
| JPS59169957A (en) | cement quick setting agent | |
| JPS6256342A (en) | Manufacture of glass fiber reinforced concrete | |
| ATE35530T1 (en) | DRY PROCESS FOR THE MANUFACTURE OF PLASTER BOARDS. | |
| JPH025705B2 (en) | ||
| US1326894A (en) | Treatment of | |
| JPS5884167A (en) | Method of hardening slag inorganic material | |
| US2228061A (en) | Plastic composition | |
| JPH11278910A (en) | Acid-resistant protecting member for concrete | |
| US1900670A (en) | Cement or materials containing cement | |
| KR860000420B1 (en) | Process for preparing cement waterproof stuff | |
| JPS63144154A (en) | Hardened matter | |
| JPS5891047A (en) | Cement additive | |
| JPH0421554A (en) | Mixing method of sulfate-resistant mortar/concrete | |
| JP3791939B2 (en) | Method for producing lightweight cellular concrete board | |
| JPS6351988B2 (en) | ||
| JPH06107479A (en) | Method for producing hardened oil-resistant cement |