摘要
将无活性固废材料(污泥)部分替代细骨料制备污泥细骨料充填体,通过微观结构表征和物理力学试验,分析了不同掺量(0%、4%、6%、8%、10%)污泥细骨料充填体的流动度、初凝时间、终凝时间、吸水率、孔隙指数等物理特性和抗压强度,并优化了污泥细骨料的最佳掺量。结果表明:含4%、6%、8%和10%污泥细骨料的充填体试样流动性分别比不掺污泥细骨料的充填体试样降低了3.0%、11.2%、12.2%和14.3%。污泥细骨料掺量为4%、6%、8%和10%的试样没有发生显著的流动性降低问题;养护28 d后,掺入8%的污泥细骨料充填体试样力学性能最优,其抗压强度为51 MPa,较不掺污泥细骨料充填体试样(42 MPa)提升了21.4%。污泥细骨料掺量为4%、6%、8%和10%的试样抗压强度较不掺污泥细骨料试样分别提升了9.5%、19.0%、21.4%和14.3%,反映出污泥细骨料的掺入显著提升了充填体抗压强度。在水中浸泡28 h后,不掺污泥细骨料充填体试样较掺污泥细骨料充填体试样吸收了更多水,反映出后者孔隙指数低于前者,吸水率也较低。掺入6%的污泥细骨料充填体试验初凝和终凝时间最长,一定掺量下的污泥细骨料延长了凝结时间,污泥细骨料的最佳替代率为8%。
The inactive solid waste(sludge)was partially replaced by fine aggregate to prepare sludge fine aggregate backfill.Through microstructure characterization and physical and mechanical tests,the fluidity,initial setting time,final setting time,water absorption rate,pore index and other physical properties and compressive strength of the sludge fine aggregate backfill with different content(0%,4%,6%,8%,10%)were analyzed.The optimum amount of fine aggregate was optimized.The results show that the fluidity of the backfill samples containing 4%,6%,8%and 10%sludge fine aggregate is reduced by 3.0%,11.2%,12.2%and 14.3%,respectively,compared with the backfill samples without sludge fine aggregate.The samples with 4%,6%,8%and 10%sludge fine aggregate content did not have significant fluidity reduction.After 28 days of curing,the mechanical properties of the sample with 8%sludge fine aggregate filling were the best,and its compressive strength was 51 MPa,which was 21.4%higher than that of the sample without sludge fine aggregate filling(42 MPa).The compressive strength of the samples with 4%,6%,8%and 10%fine aggregates increased by 9.5%,19.0%,21.4%and 14.3%,respectively,compared with the samples without fine aggregates,reflecting that the addition of fine aggregates significantly improved the compressive strength of the backfill.After soaking in water for 28 h,the sample of fine aggregate backfill without sludge absorbed more water than that of fine aggregate backfill with sludge,reflecting that the pore index of the later was lower than that of the former,the water absorption rate was also lower.The initial and final coagulation time of 6%sludge fine aggregate filling body is the longest,the coagulation time is extended with a certain amount of sludge fine aggregate,and the best replacement rate of sludge fine aggregate is 8%.
作者
张果瑞
王赟潇
刘羿甫
ZHANG Guorui;WANG Yunxiao;LIU Yifu(Department of Engineering Management,Henan Technical College of Construction,Zhengzhou 450064,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《金属矿山》
CAS
北大核心
2024年第11期284-288,共5页
Metal Mine
基金
河南省科技厅重点研发与推广专项(编号:222400410338)。
关键词
固废材料
细骨料
充填体
流动度
抗压强度
孔隙指数
凝结时间
solid waste material
fine aggregate
backfill
fluidity
compressive strength
pore index
setting time
作者简介
张果瑞(1989-),女,讲师,硕士;通信作者:刘羿甫(1986-),男,讲师,博士研究生。
