Concrete composition using blast furnace slag composition

Abstract

Concrete compositions including a binder, water, a fine aggregate, a coarse aggregate and an admixture are provided. The binder is formed with a blast-furnace slag composition including 100 mass parts of a mixture of 80-95 mass % of blast-furnace slag fine particles with fineness 3000-13000 cm2 / g and 5-20 mass parts of gypsum for a total of 100 mass % and 0.5-1.5 mass parts or 5-45 mass parts of an alkaline stimulant. Such concrete compositions can maintain superior operability by reducing the discharged amount of carbon dioxide and the decrease with time in fluidity and air content of the prepared concrete compositions. They can also reduce the drying shrinkage of the obtained hardened objects and allow the obtained hardened objects to manifest necessary strength.

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...

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