Rheological properties of cement pastes incorporating polycarboxylate superplasticizers containing different hydrophobic groups

Xin Shu, Yanwei Wang, Yong Yang, Xiumei Wang, Qian Zhang, Hongxia Zhao, Jiaping Liu, Qianping Ran

Research output: Contribution to conferencePaperpeer-review

Abstract

Rheological properties of cement pastes with polycarboxylate superplasticizers (PCE) containing different hydrophobic groups (styrene, n-butyl acrylate units) at different water to cement ratios (w/c) were investigated. Further investigation on the solution behavior (hydrodynamic radius, solution viscosity) and adsorption behavior revealed the fundamental difference of these PCE samples. At high w/c, the rheological properties of cement pastes primarily depended on the ALT and the differences at constant flow diameter were small. At low w/c, the yield stress primarily depended on the ALT, while the apparent viscosity difference relied on the balance of ALT and solution viscosity. The styrene unit enhanced the backbone stiffness and therefore the adsorption affinity, intrinsic viscosity, yet smaller ALT, therefore reduced the apparent viscosity at a proper dosage. The n-butyl acrylate unit always increased the apparent viscosity of cement pastes.

Original languageEnglish
Pages333-347
Number of pages15
Publication statusPublished - Jan 1 2018
Event12th International Conference on Superplasticizers and other Chemical Admixtures in Concrete, ICSP 2018 - Beijing, China
Duration: Oct 28 2018Oct 31 2018

Conference

Conference12th International Conference on Superplasticizers and other Chemical Admixtures in Concrete, ICSP 2018
CountryChina
CityBeijing
Period10/28/1810/31/18

Keywords

  • Apparent viscosity
  • Cement paste
  • Hydrophobic
  • Stiffness
  • Yield stress

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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