What is it about?
A microfine-cement-based grout (MCG) with Class C microfine fly ash (MFA) was prepared and the maximum grain size (dmax) was controlled at 20 μm. The ‘microfine’ effects of particles and the synergistic effects of MC, microfine fly ash (MFA) and SP on the viscous behaviour and the strength performance of grouts have not been systematically reported. The relatively new concept of ‘static viscosity’ was considered. A low initial viscosity of the optimised MCG ensured desirable rheology properties and satisfactory mechanical properties of the hardened grout.
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Why is it important?
Ordinary Portland cement (OPC) cannot be injected into medium/fine sands or microcracks, and chemical grouts were are extremely expensive, pose health and environmental hazards and show poor bonding in moist environments and insufficient durability. The microfine-cement-based grout (MCG) was designed to instead chemical grouts for grouting practices especially in geotechnical engineering. The research is also based on requirements of green and sustainable developments.
Perspectives
Writing this article was a great pleasure for our team, this article was a representative research result of interdisciplinary between material science and engineering and grouting technologies of geotechnical engineering. This article was also based on my previous disaster grouting control experience, the practical and engineering significance were big.
Fei Sha
Shandong University
Read the Original
This page is a summary of: Investigation of viscous behaviour and strength of microfine-cement-based grout mixed with microfine fly ash and superplasticiser, Advances in Cement Research, May 2017, ICE Publishing,
DOI: 10.1680/jadcr.16.00118.
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