Pavement performance of a regenerated cement stabilized mixture on construction waste(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年04期
- Page:
- 52-61
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Pavement performance of a regenerated cement stabilized mixture on construction waste
- Author(s):
- LI Wei1; 2; WEI Hui2; WANG ZHAOlun2; LI Yumei1; FENG Xuemao3
- (1.Henan Transportation Research Institute CO., LTD, Zhengzhou 450006, Henan, China; 2. State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410076, Hunan, China; 3. Guangxi Xinhengtong Expressway CO., LTD, Nanning 530029, Guangxi, China）
- Keywords:
- road engineering; construction waste; regenerated aggregate; cement stabilized mixture; pavement performance
- PACS:
- -
- DOI:
- -
- Abstract:
- To analyze the feasibility and applicability of construction waste recycling aggregate on a road base, an optimal design method for a mixture ratio was established. The recycled aggregate size type and the mixing ratio of natural aggregate and cement were determined. The influences of such factors as recycled aggregate proportion (mass fraction, 10, 18, and 28%, the same below) and curing age (7~90 d) on mechanical strength performance and the mechanical stiffness, frost resistance, erosion resistance, and shrinkage performance of the recycled mixture were studied. The results show that the mechanical strength of the recycled aggregate is lower than that of natural aggregate and the water absorption rate reaches 10%, and when the mixing amount reaches 28%, the mechanical strength of the mixture composed of the 5 to 10 mm recycled aggregate, is higher than that of the 10 to 20 mm recycled aggregate, and the dispersion of the test results also significantly decreases. With an increase in the regenerated aggregate dosage, the pavement performance indicators of the regenerated aggregate are all deteriorated, among which, the degradation amplitude of splitting strength is the largest, followed by the compressive resilient modulus, the effect of compressive strength is the smallest. Within the range of 10% to 18% of the mixing amount, the loss of freezethaw strength significantly decreases while the loss of washing quality significantly decreased within the range of 18% to 28%. With the increase in curing age, the higher the proportion of recycled aggregate, the more obvious the improvement effect of the mechanical strength, which can compensated for the lack of early strength. With an increase in ambient temperature, the temperature contraction coefficient of the regenerated mixture significantly increases and the sensitivity of the regenerated aggregate dosage to the temperature contraction coefficient is further improved. Compared to natural aggregate, the basic performance indexes of urban construction waste recycling aggregate are reduced. However, it can still meet the standard requirements in part of the grade road base via reasonable processing and it is suggested to strengthen the control of the raw material index during application. 5 tabs, 13 figs, 25 refs.
Last Update: 2019-07-29