This study prepared a mud resistant polycarboxylate superplasticizer(KNPCE)using octadecyltrimethylam-monium chloride(STAC)as a sacrificial agent.The effects of different synthesis temperatures,different STAC dosages of KNPCE,and the presence or absence of montmorillonite on the performance of cement mortar were studied.The optimal proportion of superplasticizer was selected to prepare recycled concrete,and the working performance,mechanical proper-ties,and microstructure were analyzed.The results showed that KNPCE had the best performance improvement effect on mortar at a synthesis temperature of 80 ℃ and a sacrificial agent dosage of 0.4％;The slump,compressive strength,and splitting tensile strength of recycled concrete increase with the increase of KNPCE content;Sacrificial agents can increase the crystallinity of PCE crystals,but they do not change the crystal structure of PCE;The cumulative heat release of ce-ment using KNPCE is higher than that of cement using ordinary PCE.
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