Regenerate utilization of worn cement concrete is the key technical problem to be solved in traffic field while the cement concrete pavement built long ago durative disrepair. The study aimed at the worn cement concre...Regenerate utilization of worn cement concrete is the key technical problem to be solved in traffic field while the cement concrete pavement built long ago durative disrepair. The study aimed at the worn cement concrete which can not be reused in site,get recycled aggregate according to the practically technics of regenerate,and then carry out test study on the aggregate and recycle aggregate cement concrete. Test results show recycled fine aggregate is about 26% of recycled aggregate,and substantive sand pulps are adhere on the surface of recycled while the distinct crackle appears on this sand pulp surface. relative to the natural aggregate,one of the remarkable characters of the recycled aggregate is that the inartificial water ratio is relatively low and the water-absorbing ratio can reach 4%～12%,and the water-absorbing ratio increased while the grain getting fine. the second remarkable characters of recycled coarse aggregate is that the weared stone value and crushed stone value of recycled coarse aggregate are both bigger,the Los-angeles weared stone value is 32.7,the crushed stone value is 26.5. So,the recycled aggregate can not meet the criterion,but after mixed into 40% natural aggregate,it can meet. The mixture ratio test results proved that based on the dosage of cement we can through reduce water cement ratio and augment water quantity to improve the working performance of recycled concrete. The destroy form of recycled concrete goes all the way with natural concrete,the recycled aggregate can absolutely used in cement concrete under C50.展开更多
文摘Regenerate utilization of worn cement concrete is the key technical problem to be solved in traffic field while the cement concrete pavement built long ago durative disrepair. The study aimed at the worn cement concrete which can not be reused in site,get recycled aggregate according to the practically technics of regenerate,and then carry out test study on the aggregate and recycle aggregate cement concrete. Test results show recycled fine aggregate is about 26% of recycled aggregate,and substantive sand pulps are adhere on the surface of recycled while the distinct crackle appears on this sand pulp surface. relative to the natural aggregate,one of the remarkable characters of the recycled aggregate is that the inartificial water ratio is relatively low and the water-absorbing ratio can reach 4%～12%,and the water-absorbing ratio increased while the grain getting fine. the second remarkable characters of recycled coarse aggregate is that the weared stone value and crushed stone value of recycled coarse aggregate are both bigger,the Los-angeles weared stone value is 32.7,the crushed stone value is 26.5. So,the recycled aggregate can not meet the criterion,but after mixed into 40% natural aggregate,it can meet. The mixture ratio test results proved that based on the dosage of cement we can through reduce water cement ratio and augment water quantity to improve the working performance of recycled concrete. The destroy form of recycled concrete goes all the way with natural concrete,the recycled aggregate can absolutely used in cement concrete under C50.
