Interaction of Polycarboxylate-based Superplasticizer/Poly(vinyl alcohol) with Bentonite and Its Application in Mortar with Clay-bearing Aggregates

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Title: Interaction of Polycarboxylate-based Superplasticizer/Poly(vinyl alcohol) with Bentonite and Its Application in Mortar with Clay-bearing Aggregates

Author(s): Weishan Wang, Zuiliang Deng, Zhongjun Feng, Lefeng Fu, and Baicun Zheng

Publication: Special Publication

Volume: 302

Issue:

Appears on pages(s): 333-348

Keywords: adsorption; bentonite; clay; intercalation; manufactured sand; mortar; polycarboxylate superplasticizer; poly(vinyl alcohol)

Date: 6/1/2015

Abstract:
Interaction mechanisms of polycarboxylate-based superplasticizer (PCE) and poly(vinyl alcohol) (PVA) with bentonite were systematically investigated. The adsorption of PCE onto bentonite in aqueous solution was carried out, and changes in the surfaces and microstructures of the resultant PCE/bentonite complex were characterized by FTIR, XRD, TGA and HRTEM. The results indicated a large adsorption amount of PCE onto bentonite ranging from 157 mg/g to 230 mg/g. The interlayers of bentonite were intercalated by PCE molecules with some surface adsorption. PVA adsorbed onto bentonite competitively with PCE which decreased the adsorption amount of PCE drastically. Cement mortar experimental data showed ether-based PCE had better clay tolerance than ester-based PCE. PVA as sacrifice agent can enhance the dispersibility of PCE for cement with clay.