Neutralization-preventive high-early-strength cement composition

Abstract

Provided is a neutralization-preventive high-early-strength cement composition characterized by comprising 60 to 97 wt% of a highly reactive cement and 3 to 40 wt% of an inorganic admixture, wherein the highly reactive cement is produced by adding 1.5 to 4.0 wt% of gypsum in terms of SO3 content to a highly reactive cement clinker that has a mineral composition comprising more than 70% of C3S and less than 5% of C2S as calculated in accordance with a Bouge's equation, an L. S. D. value of more than 1 and a free lime content of 0.5 to 7.5 wt%, and the inorganic admixture comprises at least one material selected from a blast furnace slag, an anhydrite, a limestone micropowder and a pozzolan substance. The neutralization-preventive high-early-strength cement composition enables the efficient use of a previously developed highly reactive cement having a high C3S content and an extremely low C2S content, and is suitable as a cement for a concrete or a mortar which is used under a low-temperature environment such as a cold region or an environment in which neutralization is likely to progress.

Description

technical field [0001] The present invention relates to a neutralization inhibition type early-strength cement composition, which is the mineral composition in the clinker based on the calculated value of Bouger's formula as C 3 S>70% and C 2 The neutralization-inhibited early-strength cement composition with S<5% high-activity cement as the matrix has the same strength performance and neutralization-inhibition performance as ordinary Portland cement even if it is a substance similar to the mixed cement. Cement suitable for concrete and mortar used in low-temperature environments such as cold regions or in environments where neutralization is likely to occur. Background technique [0002] In recent years, as one of measures to prevent global warming, the reduction of carbon dioxide emissions has been sought, and even the cement industry has focused on this reduction. As one of the reduction measures, attention has been paid to the mixing of blast furnace slag and fly ...

AI Technical Summary

Problems solved by technology

[0006] In addition, as one of the other disadvantages of the above-mentioned mixed cement and cement composition, there are cases where the strength performance is low in a short period of time, and the strength performance at low temperatures such as winter is poor.

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