Performance Degradation Rules of Cement-stabilized Macadam with Construction Waste Recycled Aggregate Under Environmental Loads
To investigate the applicability of construction waste recycled aggregate in cement-stabilized macadam,this study adopted the scouring tests,wet-dry tests,freeze-thaw tests,and splitting fatigue tests to examine the performance degradation rules of recycled aggregate cement-stabilized macadam(CACSM)under environmental loads.The influences of scouring time,wet-dry cycles,and freeze-thaw cycles on CACSM mechanical strength were clarified.The performance degradation prediction models for CACSM under different conditions were constructed.The degradation limits and fatigue life of CACSM under combined environmental loads were proposed.The result indicates that the mass loss of CACSM under water scouring increases with a higher content of recycled fine aggregate.After an initial rapid increase,the mass loss tends to stabilize with extended scouring time.CACSM exhibits the significant strength degradation under wet-dry effect and freeze-thaw effect.The CACSM ultimate strength degradation can be accurately predicted with the degradation models.Due to the porous structure and high water absorption of recycled aggregate,CACSM's load-bearing capacity decreases during wet-dry and freeze-thaw cycles with the minimum degradation coefficients of 84.1%and 63.5%respectively.Additionally,CACSM with 45%recycled fine aggregate shows a slightly higher fatigue life than that with cement-stabilized macadam,indicating that an appropriate amount of recycled fine aggregate will not compromise the ability of cement stabilized macadam to resist the repeated loading.CACSM with high recycled aggregate content experiences considerable degradation under environmental loads.In actual engineering applications,it is necessary to verify whether the limit value of mechanical strength degradation meets the road base requirements.
NETL
NSTL
万方数据
