海洋环境下复合镍铁渣粉水泥土的强度劣化研究

Study on strength degradation of soil-cement mixed with composite ferronickel slag powder in marine environment

采用实验室模拟的方法,研究海洋环境对掺复合镍铁渣粉水泥土强度的影响。本文将镍铁渣粉和矿粉混合后,作为掺和料掺入到水泥土中。通过海洋环境侵蚀分析、无侧限抗压强度试验、SEM和EDS试验分析,研究了海洋环境对复合镍铁渣粉水泥土的表观特征、强度性能及微观形貌的影响。试验结果表明:海洋环境对水泥土的表观结构具有侵蚀作用,同时对其强度也具有劣化作用,而且随着侵蚀时间的增加海洋环境对其侵蚀劣化作用越来越强;水泥土中掺入的复合镍铁渣粉能发挥出微集料效应和活性效应,因而具有良好的耐久性。复合镍铁渣粉不仅能提升水泥土的强度,同时能降低海洋环境对其表观结构的侵蚀,缓解海洋环境对其强度的劣化作用。

A laboratory simulation method is used in this study to examine the effect of marine environment on the strength of cemented soil mixed with composite ferronickel slag powder.In the experiment,ferronickel slag powder and mineral powder were mixed into admixture,and then added to a cemented soil.Through erosion analysis,unconfined compression tests,and SEM and EDS test analysis,the influence of marine environment on the apparent characteristics,strength and micro-morphology of this modified cemented soil was studied.Results show that in marine environment,the modified cemented soil is eroded and its strength deteriorated.And its erosion degradation is intensifying over time.However,its component of composite ferronickel slag powder has good durability with micro aggregate effect and active effect.Thus,this type of composite powder can not only improve the strength performance of cemented soil but also reduce its erosion in marine environment and alleviate its strength deterioration.