Research on Strength Characteristics of Glass Fiber-lime Composite Modified Red Clay
In order to study the effect and mechanism of glass fiber-lime composite modified red clay under curing age,the unconfined compressive strength test,direct shear test,X-ray diffraction test and scanning electron microscope(SEM)were carried out on the plain red clay,lime modified soil and glass fiber-lime composite modified soil of Dongchuan red clay in Kunming.The test results show that:lime improved soil and glass fiber-lime composite improved soil can effectively improve the unconfined compressive strength of the soil,but the composite improvement effect is better,and the optimal ratio is lime mass admixture 5％and glass fiber mass admixture 0.3％.Lime and glass fibers can improve the unconfined compressive strength,shear strength,and cohesive strength of red clay soils,and the shear strength of the composite improved soils gradually increases with the increase of curing time and vertical pressure.A series of physical and chemical reactions take place in the improved soil,and the glass fibers cause the formation of an interwoven fiber mesh structure within the soil,increasing the tensile stress between the soil particles.However,the improvement effect of fiber will be affected by the rate of soil water content,with the increase of soil water content,the shear strength of fiber-improved soil gradually decreases,and gradually close to the shear strength of plain red clay.In the improved soil,the hydration reaction of lime generates cementing substances such as Ca(OH)2 and CaCO3,which bind the independent and adjacent soil particles,making the pores between soil particles smaller,and the bonding force at the soil-reinforcement interface is further increased,making the soil mass denser.The synergistic effect of lime and glass fibers ultimately leads to an increase in the overall strength of the soil.
foundation reinforcementred claylimeglass fibercuring timemechanical propertiesmicro-structure
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