Synthesis and performance study on EPEG type ultra high slump retaining agent
YU Susu
HAN Ruitao
NIE Guoxin
LIU Chuan
WANG Yafei
Abstract：Ultra high slump retaining agent SK was prepared by liquid-phase radical polymerization using EPEG monomers and functional monomers,and compared with the commercially available slump retaining agent BASF 412.The results showed that the optimal synthesis process parameters for ultra-high slump retaining agent SK are:The dosage of mercaptopropionic acid,H2O2,Vc,Fe-SO4,sodium hypophosphite,and AMPS accounts for 0.3%,1.5%,0.4%,0.86%,0.3%,and 0.57%of the mass of the monomer,respective-ly,synthesis temperature of 17℃,ratio of functional monomer HEA to HPA of 1.00∶2.25.The ultra-high slump retaining agent SK synthesized under optimal reaction conditions has a lower segregation rate compared to B412,similar other properties,and still main-tains slump retaining performance after 3 hours.At the same time,P·O42.5 cement from four different brands showed good adapt-ability and dispersion retention.The concrete has good fluidity,dense connections,and no bleeding or segregation.
Keywords：ultra high slump inhibitorEPEG typefunctional monomersorthogonal experiment
Publication Date：2025-11-25
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：5( 73-76,128 )