以碱渣与粉煤灰、元明粉混合制成路堤填垫用碱渣拌合土,通过多种物理与力学性能试验对比分析元明粉的影响与拌合土的工程特性.结果表明:碱渣与粉煤灰混合后不同龄期的界限含水率和颗粒分析结果证实了两者之间存在化学作用;元明粉与碱渣中的Ca(OH)2和CaCl2发生瞬时化学反应,生成NaOH和CaSO4;粉煤灰受碱激发生成多种凝胶物质充填固体颗粒孔隙,提高土体结构胶结性;元明粉使碱渣拌合土的力学性能得到显著提高,且在掺量为0%~8%范围内,拌合土力学性能随着掺量增大呈现增大趋势;但拌合土抗冻性能差,建议加入少量水泥或NaOH活性剂来改善.
Soda residue was mixed with class F fly ash and sodium sulfate to synthesize the mixing soils using for filling embankment.Several physical and mechanical tests were conducted to compare and analyze the effects of sodium sulfate and the engineering properties of mixing soils.Results show that the chemical interaction between soda residue and fly ash can be confirmed by the results of boundary moisture content and particle analysis at different curing time.The instantaneous chemical reactions have happened between Ca(OH)2 and CaCl2 to produce NaOH and CaSO4.The pores among solid particles are filled with gel substances from the alkali-activated fly ash and the cementation of soil structure is improved.The mechanical properties of soda residue mixing soils are significantly improved by sodium sulfate,and are increasing with contents in the range of 0%-8%.But the frost resistance performance of mixing soils is poor.And it is recommended that a small amount of cement or NaOH be added to improve the frost resistance performance.
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