Geomechanics and Engineering

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Expansion performance and mechanical properties of expansive grout under different curing pressures

  • Yiming Liu (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Yicheng Ye (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Nan Yao (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Changzhao Chen (School of Resources and Environmental Engineering, Wuhan University of Science and Technology)
  • Received : 2021.05.11
  • Accepted : 2023.03.05
  • Published : 2023.05.25
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Abstract

The expansion capacity and strength of expansive grout have a significant influence on the stress state of a supported rock mass and the strength of a grout-rock mass structure. The expansion and strength characteristics are vital in grouting preparation and application. To analyze the expansion performance and mechanical properties of expansive grout, uniaxial compressive strength (UCS) tests, expansion ratio tests, XRD, SEM, and microscopic scanning tests (MSTs) of expansive grout under different curing pressure conditions were conducted. The microevolution was analyzed by combining the failure characteristics, XRD patterns, SEM images, and surface morphologies of the specimens. The experimental results show that: (1) The final expansion ratio of the expansive grout was linear with increasing expansion agent content and nonlinear with increasing curing pressure. (2) The strength of the expansive grout was positively correlated with curing pressure and negatively correlated with expansion agent content. (3) The expansion of expansive grout was related mainly to the development of calcium hydroxide (Ca(OH)2) crystals. With an increase in expansion agent content, the final expansion ratio increased, but the expansion rate decreased. With an increase in the curing pressure, the grout expansion effect decreased significantly. (4) The proportion of the concave surfaces at the centre of the specimen cross-section reflected the specimen's porosity to a certain extent, which was linear with increasing expansion agent content and curing pressure.

Keywords

Acknowledgement

This study was supported by the National Natural Science Foundation of China (Grant No. 51804224) and the Key Research and Development Plan of Hubei Province (No. 2020BCA082), and the Graduate Innovation and Entrepreneurship Fund of Wuhan University of Science and Technology (No. JCX201858). We would like to thank Elsevier Language Editing Services for English language editing.

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