Title: Effect of the side chains of ether polycarboxylic acid-type water reducers on its properties
Abstract:A series of ether polycarboxylic acid-type water reducers(PCWRs) were synthesized in the water solution by using allyl polyoxyethylene ether(APEG),acrylic acid(AA),maleic anhydride(MA) and sodium meth...A series of ether polycarboxylic acid-type water reducers(PCWRs) were synthesized in the water solution by using allyl polyoxyethylene ether(APEG),acrylic acid(AA),maleic anhydride(MA) and sodium methylallyl sulfonate(MAS) as monomers,and the ammonium persulfate as initiator.The different side chain length of each water-reducer was measured by gel-permeation chromatography(GPC).The adsorption behavior of the polyether water-reducers with different molecular weight on the cement particle surface,and their cement dispersibility and the effect on the early hydration of cement were investigated.The results indicated that cement particle can selectively absorb the water-reducer molecules with different molecular weight and different side chain structure.Those with high weight molecular weight among the single side chain and those with moderate weight molecular weight among the complex side chain water-reducer molecules can be preferentially absorbed on the surface of cement particle under the same experimental conditions.The water-reducer molecules with complex side chain and moderate weight molecular weight possess remarkable dispersibility for cement and can also obviously delay the early hydration of cement paste.Read More
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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