The traditional early strength agent will have some influence on the performance of concrete early strength anddurability in the practical application process,so it is necessary todevelop a new type of early strength agent.Among them,new type early strength of agentna-no-C-S-H-PCE can better accelerate the early hydration of cement-based materials,which is conducive to the rapid generation of hydra-tion products.It is of great significance for thedevelopment and application of C-S-H-PCE to explore the effect of C-S-H-PCE early strength agent on the hydration of reference cement system.Based on thedissolution-precipitation theory of cement hydration,this paper studies the effect of C-S-H-PCE on the hydration stages of the reference cement system.The effects of C-S-H-PCE and nano-SiO2 on the hydration process were compared and analyzed by hydration heat test,and the setting time and compressive strength of each stage were measured.The results showed that the addition of C-S-H-PCE significantly shortened the hydration induction period,increased the maximum heat release rate of hydration,and promoted thedissolution of unhydrated particles.C-S-H-PCE shortened the initial and final setting time,and the strength of 1d and 3d was significantly improved.It can be seen from this that the action law and influence mechanism of C-S-H-PCE on the hydration of reference cement,so as to establish the relationship between hydration microstructure and macroscopic mechanical properties.
C-S-H-PCE early strength agentstandard cement systemhydration heatcondensation timecompressive strengthnano-SiO2
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