Experimental study on mechanical and acid resistance properties of limestone powder paste filling material
LYU Wenyu
HE Xuyan
XIE Panshi
LI Bo
ZHOU Xinxin
GUO Kai
TANG Li'an
Abstract：Aiming at the problems of large demand and high cost of fly ash in traditional coal mine paste filling materials,the mech-anical properties and acid resistance of limestone powder instead of part of fly ash as admixture of paste filling materials were stud-ied.The optimal ratio of limestone powder paste filling material and its effect on acid resistance were determined by mixed orthogon-al test and limit test.The results show that the strength of filling body is the best when the paste ratio is 25%-50%of limestone powder replacement,25-38 μm of limestone powder fineness,190 kg/m3 of cement content and 82%of mass fraction.In the acid mine water,the limestone powder paste has both hydration reaction and decomposition reaction,and the compressive strength in-creases first and then decreases.Its acid resistance is positively correlated with the fineness of limestone powder and negatively cor-related with the substitution amount of limestone powder.When the substitution amount of limestone powder is 25%and the fine-ness of limestone powder is 25 μm,the paste has better acid corrosion resistance.
Keywords：limestone powderflyashpaste fillingfilling materialcompressive strengthacid resistance
Publication Date：2025-12-20
Online Publishing Date：2025-12-29(First online date of this platform, not the publication date of the document)
Pages：8( 141-148 )