β-CD-Based Clay Inhibitor Mixed with Polycarboxylate Superplasticizer

Abstract

Aiming at the negative effect of high clay content in concrete raw materials on traditional polycarboxylate superplasticizer, atom transfer radical polymerization (ATRP) was used to polymerize methyl acryloyloxyethyl trimethylammonium chloride (DMC) by a macroinitiator based on β-CD, and the target product of a clay inhibitor was obtained. The results of the mini-slump test indicated better dispersity and dispersion stability with the initial fluidity of 255mm and the fluidity of 285mm after 60 min. When the water/cement (w/c) ratio was 0.29, the dosage of PCE and the clay inhibitor were 0.13 wt% and 0.01 wt%, respectively. Compared with the traditional polycarboxylate superplasticizer (PCE) and anti-clay polycarboxylate superplasticizer (APC), the cement paste still has better dispersity and dispersion stability, showing fine anti-clay effect and certain retarded properties.