Waterproofing mixed material

Abstract

To provide a waterproofing admixture which can be produced at low cost and can impart high waterproofing properties to concrete and ground. [Solution] The waterproofing admixture of the present invention is characterized by being a powder mixed so that the total of each component is 100% by weight, when rounded off to the first decimal place, within the range of 45-47% by weight of silica sand, 20-21% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, and 29% by weight of a mixture of hydrated lime, dolomite lime, and fly ash. Each component is inexpensive and easily available, so that the manufacturing cost can be reduced. By mixing the waterproofing admixture of the present invention with concrete as an admixture or with soil as a soil improvement agent, it is possible to impart high waterproofing to concrete and ground.

Description

[Technical field]

[0001] The present invention relates to a waterproofing admixture capable of imparting high waterproofing properties to concrete and ground. [Background technology]

[0002] As a technique for imparting waterproofing to ground or concrete, for example, Patent Document 1 discloses a ground improvement material in which an aqueous emulsion of asphalt and polypropylene is mixed with a cement-based solidifying agent in a predetermined ratio. Moreover, Patent Document 2 discloses a waterproof concrete containing cement, fine aggregate, coarse aggregate, a non-air-entraining water-reducing agent, reinforcing metal fibers and water. The present inventors have developed a waterproofing admixture that can be produced at low cost and that can impart high waterproofing properties to concrete and ground, and have obtained a patent for it (Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-53889 [Patent Document 2] JP 2005-247663 A [Patent Document 3] Patent No. 7122792 Summary of the Invention [Problem to be solved by the invention]

[0004] The higher the waterproofing performance, the more preferable, and there is a demand for admixtures having higher waterproofing performance than the techniques disclosed in the above-mentioned patent documents.

[0005] In consideration of such problems, the present invention has an object to provide a waterproofing admixture which can be produced at low cost and can impart high waterproofing properties to concrete and ground. [Means for solving the problem]

[0006] The waterproofing admixture of the present invention is a value rounded off to the first decimal place. The latter value is Silica sand 45~47 weight %、 water 20 Weight% or more , 1 weight of cement % , waterproof material 3 weight % , 13% by weight of slaked lime, 11% by weight of dolomite and 5% by weight of fly ash It is characterized in that it is a powder in which the total of each component is 100% by weight. It is also characterized by being mixed with concrete. It is also characterized as being a soil improvement material that is mixed with soil. Effect of the Invention

[0007] As a result of intensive research, the inventors of the present application have rounded off the first decimal place to obtain a waterproofing admixture. The latter value is Silica sand 45~47 weight %、 water 20 Weight% or more , 1 weight of cement % , waterproof material 3 weight % , 13% by weight of slaked lime, 11% by weight of dolomite and 5% by weight of fly ash It was found that the optimum powder is one in which the total of each component is 100% by weight. Since each component is inexpensive and easily available, the manufacturing cost can be reduced. The waterproofing admixture of the present invention can be mixed with concrete as an admixture, or with soil as a soil improvement agent, to impart high waterproofing properties to concrete and ground. [Brief description of the drawings]

[0008] [Figure 1] Table showing the component ratio of the waterproofing admixture of the present invention [Diagram 2] A table showing the details of the component ratios of each test specimen in the examples in terms of volume % and weight %. [Diagram 3] A table showing the component ratios of each test specimen in the examples in weight percent rounded off to the nearest whole number. [Figure 4] Graph showing the results of waterproof performance tests DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the waterproof material of the present invention will be described. As shown in Figure 1, the waterproofing admixture is made by mixing the following components together to make a total of 100% by weight: 45-47% by weight of silica sand, 20-21% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, and 29% by weight of a mixture of hydrated lime, dolomite lime, and fly ash (rounded to the first decimal place), then solidifying and powdering the mixture.

[0010] Silica sand is sand mainly composed of quartz grains, the main component of which is silica, and has numerous micropores. The specific gravity, porosity, and particle size of the silica sand used in the present invention are not particularly limited. Cement is "a grayish-white powder made by sintering and crushing limestone, clay, and iron oxide" (Kojien). Cement is a hydraulic material, and it hardens and sets by hydrating with water. There are no particular restrictions on the types of materials that make up cement, so any common material can be used.

[0011] Examples of waterproofing materials include, but are not limited to, asphalt-based, inorganic materials mainly composed of silicon dioxide, silicone-based, modified silicone-based, urethane-based, polysulfide-based, and polyisobutylene-based waterproofing materials. Examples of waterproofing materials that can be used include asphalt-based materials such as Narufalt C (registered trademark) from Naruse Chemical Co., Ltd. and Alpha Sol (registered trademark) from Sansei Kako Co., Ltd., and inorganic materials mainly composed of silicon dioxide such as Beston (registered trademark) from Beston Co., Ltd. Slaked lime refers to calcium hydroxide. Dolomite lime is "a lime fertilizer containing 3.5% or more citric acid-soluble magnesium" (Kojien), and is a substance whose main components are calcium carbonate and magnesium oxide. Fly ash is a combustion ash produced by burning coal and is mainly composed of silica and alumina. EXAMPLES

[0012] The results of various tests using the waterproofing admixture of the present invention are shown below. [Test specimen] The blending ratios of test specimens (1) to (6) are shown in FIG. 2 and FIG. Test specimens (2) to (4) are waterproof admixtures of the present invention. Test specimen (2) is 45% by weight of silica sand, 20% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, 5% by weight of fly ash, 11% by weight of dolomite lime, and 13% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime is 29% by weight). Note that the total of each component does not equal 100% by weight because the figures are rounded off to the nearest tenth. The same applies below. Test specimen (3) was composed of 46% by weight of silica sand, 21% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, 5% by weight of fly ash, 11% by weight of dolomite lime, and 13% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime was 29% by weight). Test specimen (4) was composed of 47% by weight of silica sand, 20% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, 5% by weight of fly ash, 11% by weight of dolomite lime, and 13% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime was 29% by weight).

[0013] Test specimens (1), (5) and (6) are comparative examples and are not included in the waterproofing admixture of the present invention. Test specimen (1) was composed of 44% by weight of silica sand, 21% by weight of water, 2% by weight of cement, 4% by weight of waterproofing material, 5% by weight of fly ash, 11% by weight of dolomite lime, and 14% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime was 30% by weight). Test specimen (5) was composed of 48% by weight of silica sand, 20% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, 5% by weight of fly ash, 10% by weight of dolomite lime, and 12% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime was 27% by weight). Test specimen (6) was composed of 49% by weight of silica sand, 20% by weight of water, 1% by weight of cement, 3% by weight of waterproofing material, 5% by weight of fly ash, 10% by weight of dolomite lime, and 12% by weight of slaked lime (total of fly ash, dolomite lime, and slaked lime was 27% by weight). The components were mixed as described above and solidified to prepare test specimens.

[0014] [Waterproof performance test] The components were mixed as described above to prepare plate-shaped test specimens. A certain amount of water was poured onto the surface of the test specimen, and the time it took for the water to penetrate was measured. As shown in the graph in Figure 4, this test was carried out on each test specimen when it was 4 weeks, 8 weeks, and 12 weeks old. Specimens that took more than 150 hours for water to penetrate (water retention time) at the 4-week age were deemed "waterproof." Usually, "4-week strength" is used as a guideline when measuring the strength of concrete. This is because the strength of concrete begins to increase gradually after it is poured, and is thought to stabilize after 4 weeks.

[0015] According to the graph in Figure 4, specimens (2), (3) and (4) had water retention times exceeding 150 hours at the age of four weeks. The comparative specimens (1), (5), and (6) also had a relatively high water retention time at the age of 4 weeks, but at the age of 8 and 12 weeks, the water retention times of specimens (1), (5), and (6) were significantly lower than those of specimens (2), (3), and (4), and therefore they were deemed unacceptable. Note that, in the waterproofing admixture disclosed in the above Patent Document 3, those with a water retention time of more than 6 hours are deemed to be "waterproof," so it can be seen that the comparative specimens (1), (5), and (6) also had sufficiently high waterproof performance.

[0016] [Conclusion] Specimens (2), (3) and (4) were found to have high waterproof performance. Specimen (2) in particular was found to have extremely high waterproof performance. It is presumed that the waterproofing admixture of the present invention will exhibit high waterproofing performance when mixed with concrete as an admixture or mixed with soil as a soil improvement agent. [Industrial Applicability]

[0017] INDUSTRIAL APPLICABILITY The present invention provides a waterproofing admixture which can be produced at low cost and can impart high waterproofing properties to concrete and ground, and has industrial applicability.

Claims

1. A waterproofing admixture characterized by being a powder mixture of 45-47% by weight silica sand, 20% by weight or more water, 1% by weight cement, 3% by weight waterproofing material, 13% by weight slaked lime, 11% by weight dolomite lime, and 5% by weight fly ash, with the total of each component being 100% by weight, rounded off to the first decimal place.

2. 2. The waterproofing admixture according to claim 1, which is admixed with concrete.

3. 2. The waterproofing admixture according to claim 1, which is a soil improvement material to be mixed with soil.

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