Research on Fracture Mechanism of Expanded Soil Improved by Waste Tire Rubber Powder
In order to investigate the fracture evolution mechanism of waste tire rubber powder improved expanded soil under the action of wet and dry cycles,the optimal particle size was selected from different particle sizes(20 mesh,60 mesh,100 mesh)according to the results of unconfined compressive strength test,and the fracture evolution mechanism and microstructure of soil with different dosages(0,4%,8%,12%,16%)under the optimal particle size were investigated by the wet and dry cycling test and scanning electron microscope.The results showed that the fracture area rate of the improved soil was lower than that of the plain soil,and the fracture area rate showed an increasing and then stable trend with the increase of the number of wet and dry cycles,after the 5th wet and dry cycle,the fracture area rate of the improved soil decreased by 40.03%,46.78%,56.75%and 66.55%compared with that of the plain soil;under the same number of wet and dry cycles,the fracture area rate decreased with the increase of doping;the healing rate decreased with the increase of doping;the healing rate increased with the increase of dosage,and the improved soil with 20 mesh parti-cle size and dosage of 4%,8%,12%,and 16%of rubber powder improved 10.56%,14.57%,19.42%and 44.85%respectively compared with the plain soil.This is because the addition of rubber powder will be loose units converge a group,fill the soil pore space,make the microstructure more dense,improve the soil water holding capacity,make the soil structure more stable,and play a better inhibition effect on the development of cracks in the soil.
rubber powderexpansive soildry-wet cyclefracture area rate
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