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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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
Appears on pages(s): 333-348
Keywords: adsorption; bentonite; clay; intercalation; manufactured sand; mortar; polycarboxylate superplasticizer; poly(vinyl alcohol)
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.
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