화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.55, 91-100, November, 2017
DOI10.1016/j.jiec.2017.06.032  Export Citation
Effect of sodium gluconate on dispersion of polycarboxylate superplasticizer with different grafting density in side chain
Fubing Zou1, Hongbo Tan1, †, Yulin Guo1, Baoguo Ma1, Xingyang He2, and Yang Zhou1, 3
  • 1State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China
  • 2School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430070, PR China
  • 3College of Water and Architectural Engineering, Shihezi University, Shihezi 832000, PR China
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Sodium gluconate is a commonly used retarder, and the incorporation of SG has been accepted as the most efficient way to improve the basic performance of polycarboxylate superplasticizer (PCE) system in real concrete. However, this improvement cannot be always achieved, and the main reason for this uncertainty is because the interaction between PCE and SG has not completely understood. In order to gain deeper insight into this interaction, adsorption behavior and dispersion mechanism of PCE-SG system involved in two kinds of PCE with different grafting density of carboxyl groups in side chain have been investigated. Specifically, the dispersion was assessed with the fluidity of the cement paste, and adsorption behavior was estimated with total organic carbon and zeta potential. The combination between PCE and SG was characterized with conductivity, dynamic light scattering, and X-ray photoelectron spectroscopy. Finally, several models were proposed to illustrate the mechanism behind. The results show that gluconate grafted as side chain of PCE and the increase in length of PEO chain caused by addition of SG can provide contribution to dispersion. Competitive adsorption between SG and PCE would take place to reduce the dispersion, and the declining degree depends on the relative adsorption between PCE and SG. Dispersion of PCE-SG is not only dependent on added dosage of SG, but also decided by molecular structure of PCE. This result provides guidance on how to promote the basic performance of the PCE-retarder system in real engineering practice.
Keywords:Sodium gluconate;Polycarboxylate superplasticizer;Competitive adsorption;Combination
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