Abstract
The main objective of this research is to propose an optimized proportion of the fly ash of thermal power plants used in the concrete mixture for underground mine supports in Quang Ninh coal area. Fly ash is used as a partial replacement of cement in fresh concrete for underground mine supports to reduce the cost of drift supporting and to increase the effects of the environment protection. This study also shows that the new trend in using new material to make rock/soil support in the underground mines in Vietnam. Fly ash utilization in concrete as partial replacement of cement is gaining importance day by day. Technological improvements in thermal power plant operations, as well as collection systems of fly ash, improved the quality of fly ash. For the use of fly ash in concrete, cement is replaced partially by fly ash in concrete by laboratory tests at the construction laboratory of Hanoi University of Mining and Geology (HUMG). In this experimental work, concrete mix was prepared with the replacement of fly ash by 0%,10%, 20%, 30%, and 40%.
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