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Concrete composition using blast furnace slag composition

A technology for concrete composition and blast furnace slag, which is applied in cement production and other directions, can solve the problems of decreasing and increasing the compressive strength of the hardened body, unable to ensure workability, and difficult to suppress the drying shrinkage of the hardened body, etc. The effect of suppressing drying shrinkage and good workability

Inactive Publication Date: 2012-05-16
TAKEMOTO YUSHI KK
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Problems solved by technology

However, in these conventional proposals, if the amount of blast furnace slag fine powder used is actually increased, 1) good workability cannot be ensured, 2) it is difficult to suppress the drying shrinkage of the hardened body, and 3) the decrease in the compressive strength of the hardened body increases. and other issues that in some respects pose significant obstacles

Method used

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  • Concrete composition using blast furnace slag composition
  • Concrete composition using blast furnace slag composition
  • Concrete composition using blast furnace slag composition

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Embodiment 1～36

[0068] Under the blending conditions recorded in Table 3, each specified amount of mixing water (tap water), blast furnace slag composition, and fine aggregate (river sand produced in the Oi River system, density=2.58) was dropped into a 50-liter pot-type forced mixer. g / cm 3 ), in addition to adding a specified amount of mixed materials such as cement dispersant, drying shrinkage reducing agent, and expansion material, and further adding an air volume regulator (AE agent manufactured by Takemoto Oil Co., Ltd., trade name AE-300), kneading for 45 seconds. Finally, put in a specified amount of coarse aggregate (crushed stone from Okazaki, density = 2.68g / cm 3 ), mixed for 60 seconds to manufacture a concrete composition with a target slump of 18 ± 1 cm and a target air volume of 4.5 ± 1% water / blast furnace slag composition mass ratio of 45% or 40%.

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Abstract

Disclosed is a concrete composition which is capable of securing good construction workability by suppressing decrease in fluidity of the concrete composition or decrease of air in the concrete composition over time, while suppressing the discharge amount of carbon dioxide. The concrete composition is also capable of suppressing drying shrinkage of a hardened product thereof and providing the hardened product with a necessary strength. Specifically disclosed is a concrete composition containing at least a cementitious material, water, a fine aggregate, a coarse aggregate and an admixture, wherein the blast furnace slag composition described below is used as the cementitious material at a mass ratio of water / blast furnace slag composition of 30-60%. Blast furnace slag composition: a blast furnace slag composition which is obtained by adding 0.5-1.5 parts by mass or 5-45 parts by mass of an alkali activator per 100 parts by mass of a mixture that contains 80-95% by mass of a ground granulated blast furnace slag powder having a fineness of 3,000-13,000 cm2 / g and 5-20% by mass of gypsum (with the total of the blast furnace slag powder and the gypsum being 100% by mass).

Description

technical field [0001] The present invention relates to a concrete composition obtained using a blast furnace slag composition. In recent years, there has been an increasing demand for reduction of carbon dioxide emissions and improvement of energy consumption efficiency. In view of the foregoing, in the field of concrete compositions, granulated blast furnace slag (blast furnace castor slag) by-produced from ironworks is effectively used as a raw material of blast furnace slag cement in the form of blast furnace slag fine powder. Blast furnace slag cement, which is usually used in concrete compositions, is manufactured by mixing blast furnace slag fine powder with ordinary Portland cement. According to JIS-R5211, it is classified into type A (more than 5% to 30%), Type B (over 30% to 60%), and Type C (over 60% to 70%). The above-mentioned blast furnace slag cement has the following advantages: low heat of hydration, large increase in long-term strength (strength), high wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08C04B7/02C04B22/06C04B22/14C04B24/26C04B24/32
CPCC04B2103/50C04B2111/34C04B28/08C04B7/19Y02P40/10C04B7/02C04B22/143C04B24/2647C04B24/32C04B7/21C04B18/141C04B22/144C04B24/26C04B28/04
Inventor 米泽敏男三井健郎井上和政池尾阳作和地正浩莲见孝志木之下光男齐藤和秀黑田萌玉木伸二
Owner TAKEMOTO YUSHI KK
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