Improvement of cement-based grouts for underground engineering

What is it about?

To determine the viscoelastic behaviour of MCG comprehensively and enhance its injectability, the viscosity variation characteristics of MCG suspensions need to be known. In this research, the new test method of ‘static viscosity’ was adopted and the synergistic effects of microfine cement (MC) fineness, water/solids (w/s) ratio and contents of microfine fly ash (MFA), silica fume (SF) and superplasticiser (SP) on the static viscosity of MCGs were studied comprehensively.

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Why is it important?

The optimised viscoelastic behaviour, desirable spreading ability and flowability of MCGs can ensure their injectability, grouting effects and substitution for chemical solution in grouting applications, especially for small voids and microcracks.