非化学计量C_2S的研究

A STUDY OF NON-STOICHIOMETRIC C2S

本文研究了NaF存在时,非化学计量配比(CaO/SiO_2=2.2)的C_2S的形成和水化。实验结果表明,当将掺3％NaF的非化学计量试样在1370K煅烧1小时,空气急冷后所得的β—C_2S样品中含21％C_3S。这样品的水化速率较高,它的28天以后净浆的抗压强度甚至超过纯C_3S浆体强度。

The formation and hydration of a non-stoichometric C_2S with the addition of NaF was studied. The experimental showed, by adding 3% NaF to a non-stoichiometric sample (C/S=2.2),about 21% C_3S and 79% C_2S, were formed at 1370 OK by air quenching. The hydration reactivity of this sample was higher than that of the β-C_2S formed at 1270OK. The compressive strength of this sample after 28 days hydration was even higher than the C_3S paste in the same hydration age.