摘要
采用水泥、粉煤灰、矿渣固化/稳定化大冶红星湖重金属污染底泥,考察掺加剂配比、养护期及初始含水率对底泥固化土无侧限抗压强度的影响及浸出毒性研究。结果表明:影响底泥固化土强度的因素按重要性排序为:水泥>矿渣>粉煤灰;水泥、粉煤灰和矿渣掺加量最佳配比为A3B3C3,即水泥∶粉煤灰∶矿渣=13∶25∶15。无侧限抗压强度随着养护期的延长呈现出逐渐增大的趋势,在第21 d强度达到最大值为1 232 k Pa。当初始含水率为60%时,底泥固化土的无侧限抗压强度较大,但随着含水率的增加,强度逐渐降低。底泥固化土中重金属Cu、Pb、Cd、Zn、Cr、Ni浸出浓度均低于《危险废物鉴别标准浸出毒性鉴别》(GB5085.3-2007)中规定的限值。
A cement-flyash-slag system was used to solidify and stabilize heavy-metal-contaminated sediments in Hong-xing Lake. It was investigated that the effects of the mixing ratio,curing time and initial water content on the unconfined compressive strength of the solidified sludge and leaching toxicity research. The results demonstrated that the importance of influencing factors on the strength of solidified soil were as follows ： cement slag fly ash,and the best ratio of cement,fly ash,slag was A3 B3 C3,that was cement ∶ fly ash ∶ slag = 13 ∶ 25 ∶ 15. Unconfined compressive strength reached a maximum value of 1 232 k Pa in the twenty-first day,which showed a gradually increasing trend with the extension of curing period. In addition,When the initial water content was 60 %,the unconfined compressive strength was larger,which decreased with the increase of the water content. The leaching concentrations of heavy metals including Cu,Pb,Cd,Zn,Cr and Ni in the solidified sediments were all lower than those of identification standards for hazardous wastes-identification for extraction toxicity （ GB5085. 3-2007）.
出处
《湖北理工学院学报》
2016年第5期22-27,39,共7页
Journal of Hubei Polytechnic University
基金
湖北省科技支撑计划项目(项目编号:2014BHE0030)
关键词
重金属
底泥
固化/稳定化
无侧限抗压强度
浸出浓度
heavy metal
sediment
solidification/stabilization
unconfined compressive strength
leaching concentration
