Experimental Study on the Influencing Factors and Engineering Properties of Mineral Powder Bubble-mixed Lightweight Soil
Due to the complex geological conditions,few available land resources,and high requirements for construction technology and ecological environmental protection,the low-grade highway reconstruction and expansion project in the southwest mountainous area ur-gently needs to adopt a green,environmental-friendly,economical and reasonable highway upgrading plan.By introducing the composi-tion and mechanism of bubble-mixed lightweight soil,exploring the influencing factors and laws of bubble-mixed lightweight soil,con-ducting compressive strength and dry shrinkage performance tests on bubble-mixed lightweight soil with 5 different mineral powder dosa-ges,evaluation on the bubble-mixed lightweight soil is carried out with consideration of the actual application effect.The results show that the secondary reaction between cement hydration and mineral powder can promote the hardness of bubble-mixed lightweight soil,and the interface coupling effect can improve the interface strength and compactness.Portland cement has the best effect and the amount of foaming agent has an impact on fluidity and compressive strength.The admixture affects dry shrinkage and compressive strength.Different dosage admixtures have different effects on its dry density,compressive strength and water absorption.Aggregates can adjust internal hu-midity and affect dry shrinkage deformation;When the mineral powder mix ratio is less than 30%,the compressive strength and dry shrinkage of the lightweight soil are good,which can meet the design requirements on strength of the subgrade material.
bubble-mixed lightweight soilworking mechanisminfluencing factorengineering propertysubgrade construction
万方数据
维普
