Synthesis and Characterization of Polyether Type Polycarboxylate Superplasticizer and Its Microscopic Action Mechanism on Cement

Abstract

Abstract: In this paper, polycarboxylate superplasticizers JS-PCE and BT-PCE were synthesized by free radical polymerization using polyether, acrylic acid and hydroxyethyl acrylate as raw materials. JS-PCE synthesis condition is optimized by orthogonal design as follows: the polymerization temperature is 25 ℃, the dripping time of ascorbic acid-mercaptopropionic acid mixture and acrylic acid is 3 h and 2.5 h, respectively, the ratio of acid to ether is 4.25∶1, and the initiator dosage is 1.10% of polyether total mass. The fluidity of the cement slurry with JS-PCE is up to 230 mm, which shows good fluidity. Interfacial chemistry and electrochemical methods were used to explore the micro-mechanism of superplasticizer on Xinjiang cement. The results show that the polycarboxylate superplasticizers have saturated adsorption capacity on the surface of cement particles, and there was strong adsorption between the polycarboxylate superplasticizers and cement particles, which contributed to dispersion and water reduction effect. The rheological behavior analysis shows that the optimal content of JS-PCE and BT-PCE is 0.3% and 0.4%, respectively.

Key words: polycarboxylate superplasticizer, cement, action mechanism, rheology

CLC Number:

TQ172.1

ZHANG Xiaoyu, ZHEN Weijun, GUAN Shoulu, CHEN Jun. Synthesis and Characterization of Polyether Type Polycarboxylate Superplasticizer and Its Microscopic Action Mechanism on Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3366-3375.

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