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Title High-performance carboxylate superplasticizers for concretes: Interplay between the polymerization temperature and properties
Date 15.06.2017
Number 53121
Abstract Polycarboxylate superplasticizers based on acrylic acid (AA) and maleic anhydride (MAn) were synthesized via free-radical copolymerization with an ethylene glycol monomer and characterized. The copolymerization temperature (ranging from 50 to 90·°C) appeared to be the key operating factor governing the chemical structure of the superplasticizers. The chemical structures of the products were analyzed by gel permeation chromatography, whereas an optimized sample was further analyzed by Fourier transform infrared spectroscopy and 1H-NMR. Superplasticizers of the AA and MAn classes were then incorporated into concrete, and their performances were measured by slump and slump loss tests, where a large dependency of the microstructure on the synthesis temperature was recognized. The optimum temperatures were found to be 50 and 80·°C for the AA and MAn modifiers, respectively. At their own optimum temperatures, the AA and MAn superplasticizer revealed slump losses from 23 to 4·cm and 15 to 5·cm, respectively, after 45·min. The chemical structures of the plasticizers were patterned illustratively to speculate the performance of each superplasticizer according to changes that took place in the backbone length and side-chain density. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44908.
URL http://dx.doi.org/10.1002/app.44908
Publisher Journal of Applied Polymer Science
Identifier 0
Citation Journal of Applied Polymer Science 134 (2017) ID44908
DOI http://dx.doi.org/10.1002/app.44908
Authors Tajbakhshian, A. ; Saeb, M. R. ; Jafari, S.H. ; Najafi, F. ; Khonakdar, H. A. ; Ayoubi, M. ; Asl, F.H.
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