A STUDY ON THE SENSIBILITY OF CONVENTIONAL VINYL ETHER-BASED POLYCARBOXYLATE SUPERPLASTICIZERS TOWARD DIFFERENT CLAY MINERALS

Author(s): Lei Lei, Johann Plank
Paper category: Proceeding
Book title: Design, Performance and Use of Self-Consolidating Concrete
Editor(s): Caijun Shi, Zhihua Ou and Kamal Henri Khayat
Print-ISBN: 978-2-35158-143-8
e-ISBN: 978-2-35158-144-5
Publisher: RILEM Publications SARL
Publication year: 2014
Pages: 126
Total Pages : 1
Language : English

Abstract: The sensibility of conventional vinyl-ether based polycarboxylate (PCE) superplasticizers toward three different clay minerals (montmorillonite, kaolinite and muscovite) was studied. At first, two vinyl-ether PCEs possessing different side chain length were synthesized from maleic anhydride (MA), mono methoxy poly (ethylene glycol) ester of MA and 4-hydroxy butyl vinyl ether (HBVE). Next, the effect of three different clay minerals on the fluidity of cement paste admixed with these PCE samples was investigated. It was found that the PCEs are negatively affected by the clays in the order: montmorillonite >> kaolin > muscovite. The study suggests that vinyl ether-based conventional PCEs containing ethylene glycol side chains reasonably tolerate all types of clay minerals except montmorillonite. When montmorillonite is present as a contaminant, then these PCEs loose their dispersing effectiveness completely. A mechanistic study revealed that such conventional PCEs indeed incorporate into the layer structure of the aluminosilicate. This behavior explains their strongly decreased performance. At the end, some suggestions are made to overcome the sensibility problem of PCEs with clay contaminants.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00