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KSCE Journal of Civil Engineering

, Volume 23, Issue 12, pp 5163–5172 | Cite as

Effect of Carboxylic Density on Sulfate Sensitivity of Polycarboxylate Superplasticizers

  • Yan HeEmail author
  • Xiong Zhang
  • Tao Ji
  • Liangliang Shui
Structural Engineering
  • 5 Downloads

Abstract

Effect of carboxylic density on sulfate sensitivity of polycarboxylate superplasticizers (PCEs) was analyzed. PCEs with different carboxylic densities were synthesized by changing molar ratio of isopropyl oxy polyethylene glycol (TPEG) macro-monomer to acrylic acid. The compositions of the self-synthesized PCEs were tested by 1H nuclear magnetic resonance spectroscopy (1H NMR), and the molecular weight was tested by size exclusion chromatography (SEC). Effects of sulfates on the adsorption-dispersing properties of PCEs and the surface charge of cement system in function of PCEs were investigated through total organic carbon (TOC) analyzer, mini-slump cone, and Zeta potential analyzer. Influence mechanisms of sulfates on the dispersing force of PCEs were evaluated through the competitive adsorption of sulfates, the aggregation of PCEs and the calcium ion concentration in pore solution. The results show that the competitive adsorption between PCE and SO42− impairs the dispersing capability of PCEs. In comparison with calcium sulfate, sodium sulfate has higher negative effects on the dispersing capability of PCEs. High amount of sulfate ions leads to the aggregation of PCEs, which further impairs the dispersing capability of PCEs. PCE with higher carboxylic density is less sensitive to the impact of sulfates.

Keywords

sulfates polycarboxylate superplasticizer dispersing capability adsorption behavior aggregation 

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Notes

Acknowledgments

The authors acknowledge the support of the National Natural Science Foundation of China (51808369), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJB560016), the Opening Project of State Key Laboratory of Green Building Materials (YA-615), the Opening Project of State Key Laboratory of Silicate Materials for Architectures (SYSJJ2018-09), the Construction System Science and Technology Project of Jiangsu Province (2018ZD049), and the Natural Science Foundation of Suzhou University of Science and Technology (XKQ2018009).

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Copyright information

© Korean Society of Civil Engineers 2019

Authors and Affiliations

  • Yan He
    • 1
    • 5
    • 6
    Email author
  • Xiong Zhang
    • 2
  • Tao Ji
    • 3
  • Liangliang Shui
    • 4
  1. 1.School of Civil EngineeringSuzhou University of Science and TechnologySuzhouChina
  2. 2.Key Laboratory of Advanced Civil Engineering Materials of Education MinistryTongji UniversityShanghaiChina
  3. 3.School of Architecture and EngineeringNanjing Institute of TechnologyNanjingChina
  4. 4.Shanghai Municipal Engineering Design Institute Co., Ltd.ShanghaiChina
  5. 5.State Key Laboratory of Green Building MaterialsChina Building Materials AcademyBeijingChina
  6. 6.State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhanChina

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