| With the high speed development of the domestic construction engineering industry and the road engineering industry,the deposition of siltated waste soil has become more and more serious.In order to solve this problem well,soil stabilizer also arises at the historic moment,which is concerned by various engineering fields of the society because of its high-efficiency strength improvement ability for soft soil.This test adheres to the concept of sustainable development,in order to reuse the mucky clay caused by engineering waste,taking the mucky clay of a construction site in Hangzhou as the research object,and in order to replace the traditional cement-based curing agent and reduce the emission of harmful gases,the slag in industrial waste slag has entered our field of vision,taking into account the engineering requirements The application and research of rice material is not perfect.We introduce a new type of nano material nano-W,and take slag,nano-W and quicklime as the main curing agent.Through orthogonal test,we carry out mix proportion design;Through the UCS test and split test of the solidified soil,the influence of the slag-nano W composite soil solidification agent on the macro-mechanical properties of the silty clay was explored,combined with the water stability test of the solidified soil and The freeze-thaw cycle test observes its durable road performance;finally,we use the scanning electron microscope(SEM)test method and the X-ray diffraction(XRD)test method to study the effect of the slag-nano W composite soil solidification agent on the microstructure of the silty clay And mechanism of action.The specific conclusions are as follows:(1)The orthogonal test method of three factors and three levels was used in this experiment,and 9 experiments were designed The results were analyzed by range analysis and variance analysis.The optimal mix proportion of slag nano-W composite soil stabilizer is quicklime: nano-W : slag = 32:3:65.(2)According to the optimal mix proportion of solidified agent obtained by orthogonal design,the influence of different dosage and curing age of solidified agent on muddy clay is explored through UCS test and splitting test.It is found that with the increase of dosage of slag nano-W composite soil solidified agent,the compressive strength of muddy clay first increases and then decreases,as the number of days of curing age of the solidified soil increases,the strength of the solidified soil will increase accordingly.In order to consider the economic benefits and design requirements of the actual project,this paper finally determines that the optimal dosage of slag nano-W composite soil stabilizer is 10%,and puts forward the empirical formula of the strength of the corresponding stabilizer to solidify the silt,which is convenient for the actual project to select the appropriate dosage and maintenance period.(3)According to the optimal dosage of slag nano-W composite soil stabilizer,through water stability test and freeze-thaw test,it can be easily found that the water stability coefficient of slag nano-W composite soil is negatively correlated with the curing age at first and then positively correlated;in freeze-thaw test,slag nano-W composite soil meets the design requirements.(4)SEM and XRD tests were used to compare the microstructure of muddy clay before and after adding slag nano-W composite curing agent.It was found that the hydration reaction,pozzolanic reaction and cation exchange reaction would occur between muddy clay and solidified agent.These reactions would enhance the attraction between soil particles,reduce the pore area of soil,enhance the connection between soil particles,and improve the stability of soil The reason for the increase of the strength of solidified soil is well explained from the microcosmic point of view. |
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