Study on the mechanical and microscopic properties of recycled concrete aggregate to improve loess
In order to explore the strength and microscopic variation of recycled aggregate improved loess,triaxial tests and scanning electron microscopy tests were carried out on regenerated and improved loess and pure loess.The results of consolidation shear test show that with the increase of water content,the stress-strain relationship between improved loess and pure loess samples gradually changes from a curve with obvious stress peaks to a strain hardening form without significant peaks.Moreover,the ultimate axial stress of the sample mixed with recycled concrete aggregate is increased by 23%～49%compared with that of pure loess,and the growth trend shows an approximate linear relationship with the confining pressure.Electron microscope scanning tests were carried out on the samples before and after shearing.Among them,the microscopic porosity and average particle area of improved loess decrease with confining pressure to a greater extent than that of pure loess,that is,the microstructure of regenerated loess before and after shearing is more compact than that of pure loess,which also confirms the conclusion that its macroscopic ultimate axial stress has been increased.Based on the regression analysis,it was found that the influence of the content and water content of the large and small aggregates on the maximum axial stress was very high,and the increase of water content would lead to the deterioration of soil strength,and the increase of large and small aggregate content could improve the soil strength.
万方数据
维普
