New developing method of concrete members against sulfate attack with low shrinkage and chemical stability

本研究的目的是评价使用γ-C2S、高压灭菌器和加速碳化对与硫酸盐抗性相关的硫酸盐离子渗透性的影响，并从反应产物和孔隙率的角度阐明硫酸盐离子的渗透性。结果表明，当γ-C_2S的置换率为80%时，由于球石的生成，硫酸盐离子渗透量最小。此外，还可抑制1.1 nm托勃莫来石在硬化体中的溶解。此外，硬化体表面的低Ca/SiC-S-H可能有助于提高硫酸盐离子的渗透阻力。

The purpose of this research is to evaluate the effect of usingγ-C_2S, autoclave and accelerated carbonation to permeability of sulfate ions related to the sulfate resistance, and clarify the permeability of sulfate ions from the view point of the reaction products and the porosity. As a result, in the case of 80% replacement ratio ofγ-C_2S with autoclave and accelerated carbonation, the sulfate ion penetration was the smallest due to the generation of vaterite. In addition, dissolution of 1. 1nm tobermorite in the hardened body could be inhibited. Also, low-Ca/Si C-S-H at the surface of hardened body could possibly contribute to the resistance of sulfate ion penetration.