Laboratory testing of silica sol grout in coal measure mudstones

Dongjiang Pan, Nong Zhang, Zhengzheng Xie, Xiaowei Feng, Yong Kong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

The effectiveness of silica sol grout on mudstones is reported in this paper. Using X-ray diffraction (XRD), the study investigates how the silica sol grout modifies mudstone mineralogy. Micropore sizes and mechanical properties of the mudstone before and after grouting with four different materials were determined with a surface area/porosity analyser and by uniaxial compression. Tests show that, after grouting, up to 50% of the mesopore volumes can be filled with grout, the dominant pore diameter decreases from 100 nm to 10 nm, and the sealing capacity is increased. Uniaxial compression tests of silica sol grouted samples shows that their elastic modulus is 21%-38% and their uniaxial compressive strength is 16%-54% of the non-grouted samples. Peak strain, however, is greater by 150%-270%. After grouting, the sample failure mode changes from brittle to ductile. This paper provides an experimental test of anti-seepage and strengthening properties of silica sol.

Original languageEnglish
Article number940
JournalMaterials
Volume9
Issue number11
DOIs
Publication statusPublished - 2016

Keywords

  • Coal measure mudstone
  • Grouting effectiveness
  • Sealing and reinforcement of micropores
  • Silica sol

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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