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Laboratory Testing of Silica Sol Grout in Coal Measure Mudstones

Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
Author to whom correspondence should be addressed.
Academic Editors: Andy Fourie and Jorge de Brito
Materials 2016, 9(11), 940;
Received: 29 August 2016 / Revised: 26 October 2016 / Accepted: 16 November 2016 / Published: 22 November 2016
PDF [6996 KB, uploaded 22 November 2016]


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. View Full-Text
Keywords: silica sol; coal measure mudstone; grouting effectiveness; sealing and reinforcement of micropores silica sol; coal measure mudstone; grouting effectiveness; sealing and reinforcement of micropores

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Pan, D.; Zhang, N.; Xie, Z.; Feng, X.; Kong, Y. Laboratory Testing of Silica Sol Grout in Coal Measure Mudstones. Materials 2016, 9, 940.

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