TW575532B - Foundation solidifying materials - Google Patents

Description

575532 5. Description of the invention (1) The present invention relates to a suspension type site consolidation material of neutral silica sol and fine particle cement system, especially a site consolidation which can increase the penetration time, has excellent permeability, and has high consolidation strength. Results. As cementing materials for site injection of consolidated sites, there have been various disclosures in the past. For example, the use of water glass with a small mole ratio and a high degree of inspection, and slag-based water glass cement is one of them. Although the cementing material has high consolidation strength, it has the problem of alkali dissolution. Furthermore, it is known that those who add polyvalent metals to the neutral silica sol to make cementitious materials on the site, but its low consolidation strength is its disadvantage. In order to improve the consolidation strength, a method of injecting neutral silica sol and Portland cement at a ratio of 1.5 in recent years has been adopted. However, the gelation time of the cemented material injected by this confluence is only at most Within one minute, its gelation time is very short, resulting in poor permeability. In addition, it is also known to add blast furnace slag powder and Portland cement to the neutral silica sol as a cementing material. However, when using a cementing material with a neutral silica sol, it is generally poured on the ground with a measuring cup. The gelation time measured by legislation is very short, and the gelation time in the soil is shorter, so the permeability is poor, and it is easy to cause clogging between soil particles, and it has the disadvantage that the gelation time cannot be increased in the soil. The present invention aims to solve the shortcomings of the above-mentioned conventional examples, and develops a novel technology for site consolidation materials, which is a combination of a specific amount of neutral silica sol and particulate cement and particulate slag as required under certain conditions. The compounding liquid system gradually exhibits a definite viscosity and a clear gelation time for maintaining a plastic state. The blending liquid system in this state has good permeability, and it is easy to adjust the viscosity increasing time, which can increase the penetration time.

575532 V. Description of the invention (2) It loses its fluidity and solidifies substantially, and has the same effect as the cementitious material showing the gelation time. The present invention aims to provide a suspension type site consolidation material with a long penetration time, excellent permeability, high consolidation strength, and little alkali dissolution without affecting the environment, such as neutral silica sol and particulate cement. Purpose, the site consolidation material of the present invention is to treat water glass by ion exchange resin, to remove most of the alkali in the water glass, and then to obtain a neutral silica sol through granulation, and the neutral silica Sol and particulate cement and particulate slag as required are added as effective ingredients. The above-mentioned neutral silica sol is blended in such a way that the thickening does not form a significant gelation state after blending. Either or both of the following requirements (1) and (2) are features of the present invention. That is: (1) The ratio of the amount of the liquid containing no particles after the particles are settled to the total amount of the compounded liquid, that is, the sedimentation rate is 40% or less. (2) The compounding liquid system after being mixed for more than 1 minute is in a plastic state, and it can be in a plastic state for more than 10 minutes. The site consolidation material of the present invention will be described in detail below. The consolidation material of the construction site according to the present invention is thickened after being compounded, and the viscosity is increased after a while to maintain the plasticity state, but no gelation will occur. Its thickening time is more than 1 minute, and about 10 to 12 0 minutes is appropriate, and then it is better to continue for 20 minutes. In addition, the site consolidation material according to the present invention uses the sedimentation rate, that is, the ratio of the amount of the liquid containing no particles after the particles are settled to the total solution, after the particles are settled by standing the solution. % Below match. Also, Yu Zeng

575532 5. Description of the invention (3) After sticking, in order to prevent it from forming a plastic state, the sedimentation rate is preferably less than 20%. The consolidation material for the construction site of the present invention is any one of a condition that the plasticized state is continuously maintained for more than 10 minutes after more than 1 minute has elapsed after the compounding, and that the sedimentation rate of the compounding liquid is 40% or less. Both are characteristic. When the compound liquid according to the present invention is injected into the site, when the site is compact, the compound liquid acts in the thickening stage at the same time as conventional gelation and cannot penetrate. On the other hand, when the site is coarse, the compounding liquid system can be continuously injected (infiltrated) in a plastic state from the thickening stage. Furthermore, after the instant cement is injected into the site in advance for rough plugging, the site consolidation material of the present invention is injected into the site as a retarding cement, which can further improve the improvement effect of the site. Here, the conventional site consolidation material uses a measuring cup to invert legislation to measure the gelation time. For the case where the measuring cup is inverted and the site consolidation material does not flow out as the gelation time, the present invention uses a type B The viscometer measures the gelation time, and for those solidified materials on the site of about 500 cps (centipoise) to less than 1000 cps, even if it is measured with a measuring cup inverted legislation, there will be no situation where it cannot flow out of the measuring cup. When using a B-type viscometer to measure the gelation time, the process time from the time when the compound solution is prepared to the viscosity of 500 cps is used as its "thickening time". Moreover, there are some problems if the suspension is measured with a B-type viscometer, but it is known that if the viscosity of the compounding liquid is measured with a B-type viscometer, the viscosity of the compounding liquid will be at the beginning of thickening. That is, it sharply rises to gel and become highly viscous above 2000 cps.

575532 5. Description of the invention (4) degrees, so the value measured by the B-type viscometer is used as an approximate standard. The above-mentioned gelation means that the liquid compounding liquid has shape retention due to a chemical reaction, and when it is measured by the measuring cup inversion method as described above, it is in a state that the measuring cup cannot be flowed out even if it is tilted slightly. Such a compounding liquid is completely impermeable once gelatinized, which is quite different from the compounding liquid of the present invention which can maintain a plastic state. Furthermore, even if the ungelatinized compound solution is injected into the site with the measuring cup inverted legislation, it will gradually solidify (or consolidate) if no external force is applied between the soil particles. This property does not correspond to the " No obvious gelatinous state was formed. " Moreover, if the viscosity-increasing time of the present invention is more than 10 minutes, a plastic state of more than 10 minutes can be almost continuously maintained. In addition, the sedimentation rate is a standard for the consolidation of the whole of the above-mentioned complex liquid. When using a B-type viscometer to measure the viscosity of more than 500 cps, the sedimentation rate is almost 40% or less. Since the sedimentation rate of general occasions is less than a few percentages, is the viscosity 5500 cps? It becomes a judgment criterion. Since the ungelatinized complexing liquid usually has more or less sedimentation, especially the low viscosity complexing liquid has a larger sedimentation rate, but when the complexing liquid becomes a plastic state, the particles hardly settle. The sedimentation rate is, for example, that the compounding liquid is placed in a graduated cylinder or the like and allowed to stand still, and the sedimentation rate is calculated from the amount of water separated after standing. Furthermore, at the stage where the compound solution is not flowing after the injection is completed, the sedimentation rate is related to the uniformity, water resistance and strength of the solidified substance. Therefore, the present invention measures the increase of the compound solution. Settling rate after sticking. Furthermore, the plasticity state means that when an external force such as injection is applied, it shows a flow.

575532 V. Description of the invention (5) Mobility, but once the external force is removed, it will appear immobile. At the time of cooperation, when such a plastic state is formed, the permeability will be deteriorated, but the present invention does not have such a case, that is, the invention must take at least 1 minute to form a plastic state. In addition, in the case where the duration of the plastic state is short, subsequent gelatinization may occur. Therefore, the time of the plastic state must be at least 10 minutes, and preferably 60 minutes or more. Subsequently, even if curing is performed by standing or the like, the achievement of the object of the present invention is not affected. The above-mentioned invention is a site consolidation material comprising neutral silica sol, fine particle cement, preferably fine particle cement in combination with fine slag, and the use amount of the neutral silica sol is necessary for thickening the compound liquid. That is, the amount used is 0.5 ~ 4% (capacity) of the whole compound solution, and the fine particle cement is the one with a Brun specific surface area of more than 4 00 cm V g, and an adjustment of the thickening time can be added as needed. Agent. Moreover, the active silica obtained by de-alkalizing water glass with ion exchange resin can be gelled only after mixing with sodium bicarbonate. Therefore, even before the gelation, When the silica is mixed with the cement suspension, it does not produce a plastic state like that in the case of using the active silica of the present invention. According to the site consolidation material of the present invention, the blending amount of the above-mentioned neutral silica sol is the amount of the gel that does not produce an elastic force like the uniform gel of a water glass solution type cement when the blending solution is thickened. The compounding amount is different due to the combination of the particle size of the particulate cement and the particulate slag, and even the amount of the adjusting agent for the thickening time. In terms of the time of feasible penetration, it is obviously different due to the condition of the site

Page 10 575532 V. Description of the invention (6) It is self-evident that when using the conventional silica sol-cement cement as a general neutral silica sol, its gelation time is within 30 minutes (especially in summer) Within about 3 minutes, it is almost impossible to increase the gelation time). Not only the gelation time is extremely short, but also the gelation system after the thickening begins to occur sharply, and the gel strength after gelation is also very large. It is not possible to break the gel for penetration, which is a disadvantage of the conventional example.

In view of the shortcomings of this conventional example, the site consolidation material of the present invention can increase the thickening time to more than 1 hour, and the so-called gel strength (the present invention is not plastic strength because it forms a plastic state) ) Is also weak, and can penetrate the site after the thickening time has elapsed. In this way, the time of feasible penetration can be fully extended. Furthermore, for the case where cement is injected into the site with a separate suspension liquid, the cement system descends while blocking the pores, but the site consolidation material of the present invention can be attached to the silica with a neutral silica sol. On the cement particles, the lubricity between the cement particles is good, so the permeability is also good, and then by the subsequent thickening, almost all of the injection liquid can be solidified.

The present invention uses a neutral silica sol to treat water glass with an ion exchange resin to separate and remove almost all alkalis such as Na ions, and to obtain a translucent liquid with a particle size of 6 to 50 nm by heating and granulation. And is neutral to weakly alkaline, preferably a weak alkaline with a P value of 8. 0 to 1 0.5, a specific gravity of 1. 16 to 1. 24, Si 0 to 10 to 40% by weight, And "2〇 is in the range of 0 · 0 1 ~ 4% by weight. When Na 20 is 4 W% or more, the silicic acid colloid is dissolved and an aqueous solution of silicate is formed. On the other hand, when Na 20 When it is below 0.1 W%, silicic acid

Page 11 575532 V. Description of the invention (7) Those who have a stable glue system and perform agglutination. That is, when Na 20 is in the range of 0.01 to 4% by weight, Na ion can be distributed on the surface of the silicic acid colloid while maintaining a stable colloidal shape. In this case, the particle size of the silicic acid colloid is mainly about 6 to 50 nm. When the particle size of the silicic acid colloid is greater than 50 nm, precipitation occurs. The above-mentioned silica gel system has a molar ratio (S i 0 2 / Na 20) of about 1 0 0 to 1 0, and a P value of 8 to 10, which is beneficial to the stability of the colloid. The thus prepared silicic acid glue system forms a semi-permanent stability, so when it is transported from the factory to the construction site or injected, there is no concern about gelation. In terms of the self-permeability of the particulate cement used in the present invention, it is preferable that the specific surface area of the buren is 4000 cm2 / g or more. In order to make the thickening time longer, especially increase the amount of particulate cement. Furthermore, in the case of a compound that is easy to gel, if it is desired to obtain a compound that is not easy to gel, it can be achieved by using particulate slag in combination. The combined surface area of the particulate slag used in combination is 4,000 cm V g or more, and preferably 10,000 cm2 / g or more. The strength of the consolidated material can be appropriately selected according to the application, but the amount of particulate cement used is preferably a ratio of 1 000 0 0 m 1 to 3 0 to 5 0 g of the site consolidation material. In particular, in order to obtain a high-strength, durable consolidation, the amount of particulate cement used is preferably the site consolidation material 1 0 0 0 0 m 1 to 50 g or more. The slag is also very good. In this case, the ratio of the particulate cement to the particulate slag is preferably 80 to 20:20 to 80. According to the above aspect of the neutral silica sol-fine cement system of the present invention, the thickening time can be adjusted by changing the use amount of the neutral silica sol and fine particle cement, but if further adjusting agent for thickening time is added Delayed thickening

Page 12 575532 V. Description of the invention (8) In the case of time, the permeability can be improved due to low viscosity. In the case of gelling in a short time, it can be achieved and increased by adding an adjusting agent for thickening time. There is no gelation when sticking. The amount of the adjusting agent for the thickening time depends on the use conditions of the injection material on the site. Especially J can be appropriately selected according to the liquid temperature, but the thickening time can be more than 30 minutes or even adjusted as needed. It is a feature of the present invention for several hours or more. In this case, the adjusting amount of the thickening time can be used for the fine cement of 0.1, -1. 0% by weight. Bicarbonate Λ Carbonate, Filler Acidic Carboxylate Λ Pyrophosphate citrate citrate tartaric acid 5 Sodium lignin lutein sodium polysulfonate etc. ) Cement flow agent, etc. Among the above-mentioned adjusting agents, especially bicarbonate and carbonate salts of metal test, which have little effect on the strength of the fixture, are the best adjusting agents for T ^ 7. This type of adjusting agent for thickening time The effect of adding to the neutral silica sol side and mixing with the suspension of particulate cement during injection is better. Furthermore, in the case of adding cement flow agent, it is better to add to the particulate cement side. In this case, other adjusting agents It is better to add it to the side of the neutral silica sol. In the case of adding an adjusting agent, it is better to dissolve it in water before adding the neutral silica sol. It is better to choose an adjusting agent with a uniform use state. The addition of the viscosity increasing time adjusting agent can make the viscosity of the two AB liquids smaller and make the permeability even higher. In the following the present invention will of Example described later in detail with the square body like this is only of Example

Page 13 575532 V. Description of the invention (9) The examples of the present invention are not limited to those exemplified in these embodiments, and those covered by the spirit of the present invention belong to the scope of patent application of the present invention, and are not to be waited for. Speak. The contents of the modifiers used in the examples and comparative examples of the present invention, such as neutral silica sol, slag, cement, and tackifier time, are collectively shown below. (1) Neutral silica sol: The neutral silica produced by Asahi Denka Kogyo Co., Ltd. with the composition shown in Table 1 is obtained by subjecting water glass to ion exchange resin treatment to remove most of the alkali, followed by granulation. Sol.

[Table 1] Specific gravity Si02 (%) PH particle size (millimicron) 1.20 30.5 9.5 10 ～ 20 (2) Slag: Use three types of slag with different composition and grind degree as shown in Table 2. [Table 2] Types of slag Si〇2 ai2〇3 Fe2〇3 CA〇MGO Salinity and hydraulicity Bronby table (%) (%) (%) (%) (%) Area cm2 / g 1 31.4 18.6 '1.0 46.2 1.3 2.11 .0.91 8.000 2 31.4 18.6 1.0 46.2 1.3 2.11 .0.91 10.000 j 31.4 18.6 1.0 46.2 1.3 2.11 .0.91 15.000

(3) Cement:

Page 14 575532 V. Description of the invention (ίο) Use Portland cement and South furnace cement with different composition and grind degree as shown in Table 3. [Table 3] Types of cement Si02 (%) Al2〇3 (%) Fe203 (%) CA〇 (%) MG〇 (%) Salinity hydraulic specificity Braun specific surface area cm: / 'g Portland cement 21.9 5.3 3.1 65.1 1.4 3.28 2.15 3200 Portland cement 21.9 5.3 3.1 65.1 1.4 3.28 2.15 6200 Portland cement 21.9 5.3 3.1 65.1 1.4 3.28 2.15 8100 Portland cement 21.9 5.3 3.1 65.1 1.4 3.28 2.15 10000 Blast furnace cement 25.8 9.4 2.0 54.9 3.4 2.61 1.47 8300 Blast furnace water 25.8 9.4 2.0 54.9 3.4 2.61 1.47 9700 (4) Adjusting agent for thickening time: A representative sodium bicarbonate (reagent level: NaHCOa) is used for adjusting the thickening time. Examples 1 to 9 and Comparative Examples 1 to 6: In Table 1, the neutral silica sol and sodium bicarbonate are used as the A liquid, and the B liquid is a suspension liquid of slag and cement. The ratios in Table 4 were mixed to prepare various site consolidation materials. The completed site consolidation material was measured by a B-type viscometer to measure the thickening time, and the uniaxial compressive strength was measured in accordance with the Japanese Geotechnical Society's standard "One Soil Axial Compression Test Method". Any combination of Examples 1 to 9 is a plastic state that lasts for more than 10 minutes after thickening. The results are shown in Table 4. 【Table 4】

Page 15 575532 V. Description of the invention (11) Example A liquid (500ml) B liquid (500mJ) AB combined liquid Comparative example neutral sodium bicarbonate water slag cement water thickening-axial compressive strength silica sol (g) time (Kg / cm2) NO. (G) (ml) Table 2 Weight Table 2 Weight Water (Min) 7-30 N, (g) N (g) (ml) Real 1 30 5 Residual j 150 4 50 residual 60 14.9 33.0 solid 2 60 5 residual 3 150 4 50 residual 40 16.3 41.5 solid 3 15 2.5 residual 3 150 4 50 residual 80 12.5 30.1 solid 4 15 5 residual 2 150 4 50 residual 70 11.8 29.6 silver 1030 6 Remaining 6 200 Remaining 30 9.6 25.7 Zea M 1 0 60 3 Remaining 1 150 4 50 Residual 60 10.5 35.9 «k? Η Bayi / 15 2.5 Remaining 1 150 j 50 Remaining 110 9.1 27.6 Real 8 8 2 Residual 4 200 Residual 20 17.2 39.4 Real 9 60 勹 J Residual? 200 Residual 40 8.9 30.2 Ratio 1 240 16 Residual 3 150 4 50 Residual Gelation 18.8 44.1 Residual 2 180 7.5 Residual 3 150 4 50 Residual Gelation 17.0 42.4 Than 3. 180 10, Residual 3 150 丨 5 50 Residual gelation 12.4 33.9 Than 4 Residual j 150 5 50 1 5.3 14.4 Note residue residue residue gelled than 4200 524 016 22.3 40.2 a ratio of a residue Bao 6605 j 150 1 1 50 2 3.7 Residual 10.3 NOTE

Note 1: After 3 hours, almost no viscosity increase.

Note 2 · After 3 hours, the viscosity did not reach 500 CPS. Thickening time is measured at the liquid temperature of 2 0 C. Hereinafter, Examples 10 to 12 and Comparative Examples 7 and 8 of the present invention will be described. These examples and comparative examples are permeation tests and settling tests for several combinations. The results are shown in Table 5.

Page 16 575532 V. Explanation of the invention (12) [Penetration test]: This penetration test will use Fengpu standard sand to fill a 50 X 100 cm acrylic tube with a relative density of about 60%, and then add water to make it After saturation, the compound liquids of the above-mentioned representative examples and comparative examples were injected at a pressure of 1 kgf / cm 2 and the penetration distance was measured. The filling of Toyura Standard Sand is performed several times in a quantitative manner, each time tapping the side of the acrylic tube with a wooden hammer. In addition, the preparation of the mixing liquid is to firstly put the two liquids A and B into the mixer and stir for 10 seconds. The penetration distance is defined as the range of clear color change measured by visual observation from the outside of the acrylic tube.

In addition, one week after the injection, the unconsolidated portion was washed away with water, and the estimated consolidation rate can be obtained according to the formula. In addition, the injection amount of the compounding liquid is the value of the residual amount after the injection is deducted from the day-to-day amount. Also, the void amount of the consolidated part is filled with sand as the uniform, and the void amount of the mold body of the self-consolidated part. Subtract the amount of sand to obtain. [Formula 1] The void amount of the phantom in the consolidation part (ml)-the filling amount of sand in the consolidation part (ml)

Consolidation rate (%) = ---- xlOO injection volume (ml)

[Sedimentation test] · The sedimentation test is performed by mixing the mixed liquid with a stirrer for 10 seconds to prepare the mixed liquid. When the viscosity is measured with a B-type viscometer to reach 500 cps (in comparative examples, it does not increase) After mixing for 30 minutes with the mixing solution), inject 10 m 1 into the graduated cylinder and let it stand, and every 30 minutes

Page 17 575532 V. Explanation of the invention (13) The amount of water does not change. The amount of liquid (particle water) without particles is measured by visual inspection. After the amount of water and the sedimentation rate are calculated by the formula [Formula 2] Amount of water (ml) Settling rate (%) = ^ —- X 100 Initial mixed liquid volume (ml) [Table 5]

Examples Comparative Example NO. Permeation distance (cm) of compounding solution Consolidation rate (%) Settling rate (%) Example 1 100 Table 2 Example 1 100 96 2 Example 1 Example 2 of Table 4 丨 100 99 1 Sinus 12 12 Example 4 of Table 4 65 94 η j than 1 7 Comparative Example 2 of Table 4 | 451 1 98 0 to 8 8. Comparative Example 4 of Table 4 15 57 60 Page 18 1 The symbol indicates Comparative Example 7 because Those that increase viscosity quickly and shorten the penetration distance are described below with reference to Examples 1 to 16 and Comparative Examples 9 and 10 of the present invention. For these examples and comparative examples, the viscosity increasing time was measured at a liquid temperature of 300 ° C for several combinations, and the amount of the viscosity increasing time adjusting agent (sodium bicarbonate) is shown in Table 6. The amounts are the same, and the results are shown in Table 6. According to this test result, even under high temperature, its thickening time is long and it can fully penetrate. In terms of its plastic state, except for the comparative example, any one of the examples of the present invention is 30 minutes or more. 575532 V. Description of the invention (14) [Table 6] Examples Comparative Example NO. Blending solution sodium bicarbonate (g) Thickening time (minutes) Dou 13 Example of Table 1 7 80 Dou 1 14 S 4 Implementation Example 2 6 50 Example 1 Example 3 of Table 4 4 115 Example 1 Comparative Example 6 of Table 4 4 75 Compared to Example 9 of Table 4 2 10 20 * Comparative Example 5 of Table 4 5 20 3 * The * symbol indicates the gelation time measured by the measuring cup inversion method. Examples 17 and 18 and Comparative Examples 1 and 12 of the present invention will be described below. For these examples and comparative examples, the gelation time and thickening time (or gelation time) in the soil were measured for several combinations. The results are shown in Table 7. [Measurement of gelation time in soil]: This measurement method uses a stirrer to mix and mix the mixed solution for 10 seconds to prepare a mixed solution, and then 50 g of the mixed solution is added to and mixed with 100 g of Fengpu standard sand. Then, let it stand inside, and then pierce the bamboo string into it and then pull it out, and then measure the residual time of the traces of the bamboo string piercing, and use this residual time as the gelation time in the soil. Also, at the same time with the remaining complex solution

Page 19 575532 V. Description of the invention (15) When measuring its thickening [Table 7] Examples Comparative Example NO. Thickening time (minutes) of compounding solution Gelation time (minutes) in soil Example 17 Table 4 4 70 > 120 Example 18 Table 4 5 30 110 Example 11 Table 4 Comparative Example 2 17 * 7 Ratio -12 Comparative Example 4 of Table 4 29 * 11 * The symbol indicates that the ratio is as mentioned above for particulate cement (By using a specific amount (1) by neutral a slightly into the injection disk L, 卩 gt > < combined with the slag for the refining and refining by fine grains} and} the gelation time of the case is clear The site consolidation material of the present invention is a site consolidation material mainly composed of neutral silica sol and particulate slag, and the following effects can be obtained by using neutral silica sol. > The addition of a small amount of sol can reduce the particle cement (and the clogging between soil particles when entering the site, which is permeable. f) Longer the site injection time, it is possible to inject a liquid into the liquid type. Consolidation strength.

Page 575532 Simple Explanation of Drawings Page 22

Claims (1)

575532 6. Scope of patent application (2) When more than 1 minute has passed after compounding, the compounding liquid is in a plastic state, and the plastic state can be maintained for more than 10 minutes. 3. The site consolidation material according to item 1 or 2 of the scope of the patent application, which is injecting the instant cement into the site in advance, and then injecting it into the site as a retarding cement. Page 24 Application Date: 8 '久 f 丨 丨 ^ IPC Classification Application Number: Another 7ίΠ〇Γΐ (the above columns are filled by the Office) Invention Patent Specification • 575532 Chinese Site Consolidation Materials, Invention Name English FOUNDATION SOLIDIFYING MATERIALS Name (Chinese) 1. Three rounds of seeking 2. Name of Kashiwabara 22 (English) 1. Motomu MIWA 2. Kenji KAYAHARA Inventor (total 2 persons) Nationality (Chinese and English) 1. Japan JP 2. Japan JP Residence (Chinese) 1. 2-15-10 Hono, Bunkyo-ku, Tokyo, Japan 2. 2-15-10 Hono, Bunkyo-ku, Tokyo, Japan (English) 1. 2. Name or Name (Chinese) 1. Japanese Business · Name or Name of English for Strengthening Earth Engineering Co., Ltd. (English) 1. KY0KAD0 ENGINEERING CO., LTD. Three Nationalities (Chinese and English) 1. Japanese JP Applicant (1 person in total) Residence (Business Office) (Chinese) 1. 2-15-10 Hongo, Bunkyo-ku, Tokyo, Japan (This address is the same as the applicant who applied to your office before.) Residence (Business Office) (English) 1. 1 1 Representative (Chinese) 1. Shimada Shunsuke Representative (English ) 1. Shunsuke SHIMADA 575532 V. Description of the invention (16) (4) Because the neutral silica sol does not contain a large amount of high alkali components like ordinary water glass, there are few problems that affect the environment due to the dissolution of alkali components. (5) Even when a large amount of cement is used, the neutral stone sol hardly contains high alkali components such as ordinary water glass, so that the solidified material has good durability. The calcium component of cement is easily soluble in water due to alkali, but the use of neutral silica sol makes the calcium component difficult to dissolve in water due to the chemical reaction with the neutral silica sol (石 夕 酸 # 5 ), So that the consolidation has good financial longevity. Page 21