水泥-工业废渣协同制备流态固化土的性能调控研究OA

An orthogonal experimental design was adopted to determine the optimal mix proportions of cement,fly ash,blast furnace slag,and phosphogypsum for preparing a cement-industrial solid waste curing agent.The fluid-ized stabilized soil prepared with cement and industrial wastes was further modified using polycarboxylate su-perplasticizer and calcium chloride.The engineering characteristics of the fluidized stabilized mucky soil were investigated through unconfined compressive strength tests and fluidity tests.The results show that the optimal cement∶fly ash∶slag∶phosphogypsum ratios for early-age and later-age strength are 1∶0.11∶0.44∶0.06 and 1∶0.44∶0.44∶0.06,respectively.At a polycarboxylate superplasticizer dosage of 6.4%,the fluidity of the stabi-lized soil increased by 32.1%and 35.8%for mix proportions Ⅰ and Ⅱ,respectively,and the corresponding 28-day compressive strengths reached 504.1 kPa and 548.8 kPa.With a calcium chloride dosage of 1.5%,the early-age strength of the fluidized stabilized soil increased by 33.0%and 29.1%compared with the untreated specimens,while the fluidity remained essentially unchanged.