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Nanomaterials 2018, 8(1), 46; https://doi.org/10.3390/nano8010046

Long-Term Mechanical Behavior of Nano Silica Sol Grouting

1
Key Laboratory of Deep Coal Resource Mining, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2
Department of Energy and Mineral Engineering, G3 Center and Energy Institute, Pennsylvania State University, PA 16802, USA
*
Authors to whom correspondence should be addressed.
Received: 29 November 2017 / Revised: 8 January 2018 / Accepted: 9 January 2018 / Published: 16 January 2018
(This article belongs to the Special Issue Silicon-Based Nanomaterials: Technology and Applications)
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Abstract

The longevity of grouting has a significant effect on the safe and sustainable operation of many engineering projects. A 500-day experiment was carried out to study the long-term mechanical behavior of nano silica sol grouting. The nano silica sol was activated with different proportions of a NaCl catalyst and cured under fluctuating temperature and humidity conditions. The mechanical parameters of the grout samples were tested using an electrohydraulic uniaxial compression tester and an improved Vicat instrument. Scanning electron microscope, X-ray diffraction, and ultrasonic velocity tests were carried out to analyze the strength change micro-mechanism. Tests showed that as the catalyst dosage in the grout mix is decreased, the curves on the graphs showing changes in the weight and geometric parameters of the samples over time could be divided into three stages, a shrinkage stage, a stable stage, and a second shrinkage stage. The catalyst improved the stability of the samples and reduced moisture loss. Temperature rise was also a driving force for moisture loss. Uniaxial compressive stress-strain curves for all of the samples were elastoplastic. The curves for uniaxial compression strength and secant modulus plotted against time could be divided into three stages. Sample brittleness increased with time and the brittleness index increased with higher catalyst dosages in the latter part of the curing time. Plastic strength-time curves exhibit allometric scaling. Curing conditions mainly affect the compactness, and then affect the strength. View Full-Text
Keywords: nano silica sol; long-term mechanical tests; fluctuating temperature-humidity conditions; micro-mechanism nano silica sol; long-term mechanical tests; fluctuating temperature-humidity conditions; micro-mechanism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pan, D.; Zhang, N.; Zhang, C.; Qian, D.; Han, C.; Yang, S. Long-Term Mechanical Behavior of Nano Silica Sol Grouting. Nanomaterials 2018, 8, 46.

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