支化结构超塑化剂的应用性能及作用机理

he application performances of self-synthesized branch-shaped superplasticizer and conventional comb-shaped superplasticizer were systematically investigated, and their water reducing rate of mortar, setting time and inhibition to clay's side effect were also measured. The results showed that the branch-shaped superplasticizer exhibited longer setting effect, higher water reducing rate of mortar, more excellent fluidity and fluidity retention at high clay dosage. The adsorption amount on the surfaces of cement particles and Zeta potential of branch-shaped and comb-shaped superplasticizers were compared, and the corresponding mechnism was also discussed. The results showed that the adsorption amount of branch-shaped superplasticizer on the surfaces of cement particles was higher, and its special multi-arm structure can achieve persistent workability, displaying a prominent superiority in macroscopic performances.