煤田地质与勘探2024，Vol.52Issue(5)：98-106,9.DOI:10.12363/issn.1001-1986.23.09.0526
丙烯酰胺改性粉煤灰聚合增韧注浆材料研究
Exploring a fly ash-based grouting material for toughening through in situ polymerization of acrylamide
摘要
Abstract
Efficiently controlling the water inflow(loss)of burnt rocks in the roof of coal mining faces requires grouting reinforcement materials with excellent compressive toughness.Silicate cement-based grouting materials,characterized by low costs,have been extensively applied to grouting reinforcement in coal mines.However,their hardened grout is susceptible to deformation,exhibiting poor toughness.By employing the in-situ polymerization of acrylamide(AM)for toughening,this study investigated the effects of AM,cross-linking agent,initiator,and water-cement ratio on the set-ting time,swelling capacity,compressive strength,and toughness index of the fly ash-based grouting materials.Further-more,the microstructures of the hardened grout were observed using a scanning electron microscope(SEM).Key find-ings are as follows:(1)AM can polymerize in-situ in the fly ash grout to form polyacrylamide(PAM)gel.(2)With AM content of 25%,cross-linking agent content of 0.75%,initiator content of 2.25%,and the water-cement ratio of 0.575,the fly ash-based grouting material exhibits a compressive deformation rate of above 60%,a swelling ratio of 113.43,and a toughness index of 257.92%.(3)Observations of SEM images reveal that the hardened grout of the grouting ma-terial forms an inorganic-organic mosaic network structure,with fly ash particles and PAM gel constituting its rigid framework and flexible network,respectively.The deformation rates derived from the compressive stress-strain curves of the hardened grout generally exceed 40%,suggesting significant plastic deformation characteristics.(4)Engineering experimental results show a maximum flexural toughness deformation rate of up to 25.86%.Overall,the grouting mater-ial developed in this study,with excellent toughness and fluidity,as well as favorable swelling properties in water,can be applied to water seepage and leakage control for coal mine roofs.关键词
注浆材料/烧变岩/顶板治理/粉煤灰/丙烯酰胺/韧性/优化Key words
grouting material/burnt rock/roof control/fly ash/acrylamide(AM)/toughness/optimization分类
化学化工引用本文复制引用
张跃宏,王晓东,王海,武博强,姬中奎,朱世彬,韩乐,冯龙飞..丙烯酰胺改性粉煤灰聚合增韧注浆材料研究[J].煤田地质与勘探,2024,52(5):98-106,9.基金项目
陕西省自然科学基础研究计划项目(2022JQ-308) （2022JQ-308）
天地科技股份有限公司科技创新创业资金专项项目(2023-TD-ZD004-003) （2023-TD-ZD004-003）
中煤科工西安研究院(集团)有限公司科技创新基金项目(2023XAYJS11,2023XAYJS02) （集团）
