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.
Highlights
R Paste filling is a mining method for coalmines solid waste processing including rock, fly ash, limestone powder, slag, poor soil, city solid waste and other solid waste intoA high concentration slurry which has the characteristic of critical velocity and does not need to be dehydrated, and using large filling industrial pump transportD the slurry into goaf and replacing coal resources [1]
This paper studied the mechanical properties such as lay binding specificity, dry shrinkage, adiabatic temperature rise, setting time and durability of paste under the provide the theoretical foundation for improving stability and security of filling body, reducing filling cost and improving filling efficiency
Prism specimens (100 mm100 (1) The limestone powder mixing amount had a less impact on the VC value and gas content of paste under the condition of same water binder ratio
Summary
R Paste filling is a mining method for coalmines solid waste processing including rock, fly ash, limestone powder, slag, poor soil, city solid waste and other solid waste into. The traditional paste filling materials include rock, fly ash, Portland cement and. Using limestone powder replace fly ash can reduce. R There are two kinds of views on the influence of limestone powder on paste. Ein the cement hydration process and has an influence on working performance, mechanical properties and durability. This paper studied the mechanical properties such as lay binding specificity, dry shrinkage, adiabatic temperature rise, setting time and durability of paste under the provide the theoretical foundation for improving stability and security of filling body, reducing filling cost and improving filling efficiency
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