Study on expansion properties of alkali-activated slag-based backfill slurry

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Nov.2023, Vol.46 No.11: 1510-1515

DOI: 10.3969/j.issn.1003-5060.2023.11.012

Authors

YU Yayun $ ^{1,2} $, ZHAN Binggen $ ^{1,2} $, LI Jingzhe $ ^{1,2} $, LIU Yang $ ^{1,2} $, ZHOU Yaozong $ ^{1,2} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Engineering Research Center of Low-carbon Technology and Equipment for Cement-based Materials of Ministry of Education, Hefei 230009, China)

Abstract and Keywords

Abstract: In this paper, a new type of chemical blowing agent as an expansion agent was mixed into the alkali-activated slag-based filling slurry, and the effects of different dosage of expansion agent and mass fraction of tailing sand on the expansion rate and compressive strength of the filling slurry were investigated. The experimental results show that the expansion velocity and expansion rate increase with the increase of the dosage of expansion agent and the mass fraction of tailing sand, and the expansion rate and the dosage of expansion agent show an approximately linear relationship; the expansion agent produces air holes in the filling slurry, so that the compressive strength of the filling slurry decreases with the increase of the dosage of expansion agent; and the compressive strength of the filling slurry increases with the increase of the mass fraction of tailing sand. The research results can provide theoretical reference for the application of expansive filling slurry in mine roof-contacted filling.

Keywords: cemented paste backfilling; roof-contacted filling; new expansion agent; expansion rate; compressive strength

作者信息

余雅韵 $ ^{1,2} $，詹炳根 $ ^{1,2} $，李景哲 $ ^{1,2} $，刘洋 $ ^{1,2} $，周耀宗 $ ^{1,2} $

(1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 水泥基材料低碳技术与装备教育部工程研究中心，安徽合肥 230009)

摘要和关键词

摘要: 文章将一种新型化学发泡剂作为膨胀剂掺入碱激发矿渣基的充填浆体中, 研究不同膨胀剂掺加质量分数(简称“掺量”)与尾矿砂质量分数对充填浆体膨胀率与抗压强度的影响。实验结果表明, 膨胀速率和膨胀率均随膨胀剂掺量与尾矿砂质量分数增加而增加, 膨胀率与膨胀剂掺量呈近似线性关系; 膨胀剂在充填浆体内产生气孔, 使得充填浆体抗压强度随膨胀剂掺量增加而降低; 充填浆体抗压强度随尾矿砂质量分数增加而增加。研究结果可为膨胀充填浆体在矿山充填接顶中的应用提供理论参考。

关键词: 胶结充填；充填接顶；新型膨胀剂；膨胀率；抗压强度

Funding

中国能建重大科技专项资助项目（STDC2019-KJZX-01-04）

合肥工业大学学报(自然科学版)

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