Improvement of Cemented Gangue Backfill Material with Barium Hydroxide in Acid Mine Water  

作　　者：Xiaoli Ye Yuxia Guo Peng Wang Yonghui Zhao Wenshuo Xie Guorui Feng 

机构地区：[1]College of Mining Technology,Taiyuan University of Technology,Taiyuan,030024,China [2]Province Coal-Based Resources Green and High-Efficiency Development Engineering Center,Taiyuan,030024,China

出　　处：《Journal of Renewable Materials》2023年第3期1451-1467,共17页可再生材料杂志（英文）

基　　金：sponsored by the National Natural Science Foundation of China(Grant No.51974192);the Distinguished Youth Funds of National Natural Science Foundation of China(Grant No.51925402);Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Project(2021SX-TD001).

摘　　要：As a kind of green concrete,the mechanical properties and durability of cemented gangue backfill material(CGBM)will be affected if they are in acid mine water with sulfate ions in the long term.To improve the performance of CGBM in acid mine water with sulfate ions,CGBM specimens with different doses of barium hydroxide were immersed in sulfuric acid solutions of different concentrations for 270 days.The changes of mass,ultrasonic pulse velocity(UPV)and compressive strength of the specimens at different ages were analyzed.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)were used to analyze the microstructure and composition of the specimens.The results show that incorporation of barium hydroxide into CGBM specimen can promote the formation of barium sulfate precipitation and inhibit the generation of corrosion products such as ettringite.Meanwhile,barium sulfate precipitation blocks the pore channel invaded by sulfuric acid solution,delaying the progress of corrosion reaction and making the interior of CGBM specimen more complete.And the specimen with 2.0 kg/m^(3)barium hydroxide was more effective in improving performance.This study provides a basis for the ratio design of CGBM in acid mine water with sulfate ions.

关 键 词：Cemented gangue backfill material sulfate ions CORROSION barium hydroxide microscopic performance deterioration mechanism 

分 类 号：TU526[建筑科学—建筑技术科学]