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Effects of CFB Ash on the Adsorption Mechanism of Polycarboxylate Superplasticiser

  • Juanhong Liu (刘娟红)Email author
  • Meng Gao
  • Shaomin Song
Advanced Materials
  • 4 Downloads

Abstract

The effects of circulating fluid bed (CFB) ash on the adsorption performance of polycarboxylate superplasticiser and the mechanism of this influence on the dispersive property of the polycarboxylate superplasticiser were investigated by determing the cement paste fluidity, total organic carbon adsorption, infrared spectroscopic analyses and ζ potential test. The experimental results show that the addition of an inorganic salt into the mixture to change the content of SO42- and Fe2O3 can improve the adaptability between the CFB ash and polycarboxylate superplasticiser. Adsorption may occur between the polycarboxylate superplasiciser and Fe2O3, SO42- or other components in CFB ash, leading to a significant reduction in paste fluidity. As the content of Na2SO4 in CFB ash reaches 3% or Fe2O3 reaches 9%, the paste loses its liquidity. The organic carbon content in the liquor decreases with an increase in Na2SO4 or Fe2O3 content. Adding some Ba(NO3)2 and Na2S to the liquor can recover the organic carbon content to a certain extent, and the absolute value of ζ potential will increase. The addition of Ba(- NO3)2 or Na2S reduces the adsorption property of Na2SO4 or Fe2O3 in CFB ash on the polycarboxylate superplasticiser.

Key words

CFB ash polycarboxylate superplasticiser fluidity TOC adsorption 

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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Juanhong Liu (刘娟红)
    • 1
    • 2
    Email author
  • Meng Gao
    • 3
  • Shaomin Song
    • 4
  1. 1.School of Civil and Resource EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.Beijing Key Laboratory of Urban Underground Space EngineeringBeijingChina
  3. 3.College of Civil Engineering and ArchitectureHenan University of TechnologyZhengzhouChina
  4. 4.School of Civil and Transportation EngineeringBeijing University of Civil Engineering and ArchitectureBeijingChina

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