RESEARCH ARTICLE


Partially Replacing Fly Ash with Limestone Powder in the Paste - Influence and Characterization



Lv Wenyu*, 1, 2, Zhang Zhihui2
1 School of Energy Engineering, Xi`an University of Science and Technology, Xi`an, Shanxi, 710054, P.R. China
2 Technology Center, Sichuan Coal Industry Group Co., Ltd., Chengdu, Sichuan, 610091, P.R. China


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Creative Commons License
© 2015 Wenyu and Zhihui;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Energy Engineering, Xi`an University of Science and Technology, Xi`an, Shanxi, 710054, P.R. China; Tel:+8613679287758; E-mail: lvwenyu2816@126.com


Abstract

Paste filling is an important research direction of coalmine “green mining” which can dispose coalmines solid waste and achieve environmental protection. The mechanical properties such as compressive strength, workability, ultimate tension value, shear strength and splitting strength of paste, in which the fly ash was partially replaced by limestone powder, was studied. Adiabatic temperature rise, setting time, shear strength, permeability, frost resistance and dry shrinkage of different substitution rate were investigated and the results were compared with traditional paste. The test results showed that the influence of limestone powder on workability, permeability and frost resistance performance of paste was slight, the setting time of paste were shortened, adiabatic temperature rise and mechanics performance of paste were decreased, dry shrinkage value was increased with limestone powder content increasing.

Keywords: Coalmine, fly ash, limestone powder, mechanical properties, paste, workability.