Setting and Hardening Performance of PC-CSA under C-S-H Seed and Aluminum Sulfate
LU Zichen
MOHAMMAD Mahadi Hasan
ZHANG Liheng
JIA Yayun
SUN Zhenping
Abstract：Through tests of setting time and compressive strength,the effect of calcium silicate hydrated(C-S-H)seed and aluminum sulfate(AS)on the setting and hardening performance of ordinary Portland cement-calcium sulfoaluminate cement(PC-CSA)was systematically investigated.Moreover,the mechanism was revealed with the combined techniques of hydration process,hydration product and microstructure analysis.The results show that both C-S-H seed and AS significantly shorten the setting time of PC-CSA.The combined addition of C-S-H seed and AS significantly promotes the silicate phase reaction of PC-CSA and densifies the microstructure to enhance the compressive strength of PC-CSA.When AS is doped alone,the nucleation and growth processes of hydration product C-S-H in PC-CSA are inhibited.However,the addition of C-S-H seeds mitigates the inhibition effect on the nucleation process of hydration product C-S-H by providing nucleation sites,thereby promoting the silicate phase reaction.Hence,these results address the imbalance between rapid setting and enhanced early strength of the shotcrete.
Keywords：shotcreteC-S-H seedaluminum sulfatecalcium sulfoaluminate cementhydration propertypore structure
Publication Date：2025-02-27
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 95-102 )