Experimental Study on Mechanical Properties of Silty Sand Solidified by Multi-source Solid Waste Stabilizer
Silty soil is prone to loosening and difficult to compact,and is prone to collapse when exposed to water.Various diseases are prone to occur during the filling of roadbeds,which seriously affects the performance of highways.Cement and lime stabilization of sandy soil can provide high strength and good road performance.However,the production of cement and lime causes high cost and large emissions of carbon dioxide,leading to serious environment pollution.To improve the mechanical properties of silty sand,reduce economic cost and environmental pollution,industrial solid waste such as calcium carbide slag and fly ash were prepared as stabilizers to solidify sandy loam soil in this study.The effects of different factors such as stabilizer dosage,compaction degree,and curing time on the mechanical properties of the solidified soil were investigated.The experimental results showed that:1)The CBR(California Bearing Ratio),unconfined compressive strength,and splitting strength of the solidified soil first increased and then decreased with the increase of stabilizer dosage,and the soil with a 10%dosage of stabilizer exhibited the best mechanical properties.The CBR,unconfined compressive strength,and splitting strength of the solidified soil increased with the increase of compaction degree;2)The solidified sandy soil with a stabilizer dosage no less than 2%can meet the requirements for filling the upper roadbed according to Specifications for Design of Highway Subgrades(JTG D30-2015);3)While the solidified sandy soil with a stabilizer dosage no less than 6%can meet the strength requirements for the subbase layer as specified in Technical Guidelines for Construction of Highway Roadbases(JTG/T F20-2015).
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