The thixotropic behavior of fresh cement asphalt emulsion paste

Jian Ouyang*, Yiqiu Tan, David J Corr, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The workability of grouting cement asphalt emulsion (CA) mortar is governed by the intrinsic thixotropic behavior of CA paste, but limited information is reported about the thixotropic behavior of CA paste. A new thixotropy method of constant shear rate test is proposed to study the thixotropic behavior of CA paste with different asphalt emulsion to cement ratios (AE/C). In the model, the initial structure parameter and the structure rebuilding rate are used to quantitatively describe the structure rebuilding process, the characteristic time of de-flocculation is used to evaluate the de-flocculation process, and the equilibrium shear stress is used to study the irreversible change of CA paste in the thixotropy test. Results show that CA pastes have significantly different thixotropic behavior compared to cement paste. The initial structure parameter and structure rebuilding rate of CA pastes are much smaller than cement paste, and the structure rebuilding rate decreases significantly with AE/C. The characteristic time of de-flocculation of cement paste changes little at different resting time, however, it increases significantly at the first 5 min resting time and then keep stable for CA pastes. The equilibrium shear stress of cement paste does not change in 20 min, but it increases with time for CA pastes due to the demulsification of asphalt emulsion.

Original languageEnglish (US)
Pages (from-to)906-912
Number of pages7
JournalConstruction and Building Materials
Volume114
DOIs
StatePublished - Jul 1 2016

Keywords

  • Cement asphalt emulsion paste
  • De-flocculation
  • Structure rebuilding
  • Thixotropy

ASJC Scopus subject areas

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

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