Paper Title:

Effects of Polycarboxylate Superplasticizers on Hydration and Microstructure of Hardened Cement Paste

Periodical Advanced Materials Research (Volume 487)
Main Theme Emerging Materials and Mechanics Applications
Edited by Elwin Mao and Wenya Tian
Pages 692-696
DOI 10.4028/www.scientific.net/AMR.487.692
Citation Rui Jun Gao et al., 2012, Advanced Materials Research, 487, 692
Online since March, 2012
Authors Rui Jun Gao, Sheng Hua Lv, Qiang Cao
Keywords Hydration, Microstructure, Polycarboxylate, Superplasticizer
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Abstract

Polycarboxylate (PC) superplasticizer was synthesized by radical copolymerization using ammonium persulfate (APS) as initiator at 90 °C for 5 h. The effect of PC on the hydration process and microstructure of hardened cement at different hydration ages (4 h, 1 d and 7 d) was investigated. Hydration of cement paste results show that the nucleation and growth of hydration product of ettringite (Aft) was inhibited by PC at the early hydration ages, and the generation of the hydration products of calcium hydroxide (CH) and calcium carbonate (CaCO3) was promoted at late hydration ages. SEM result indicates that PC can make the structure of hardened cement more homogeneous and more density.