Evaluation of mechanichal and fracture properties of single and two lifts concrete pavements

Document Type : Original Research

Authors
M. ahmadi 1
G. ghshafabakhsh 2
A. Hasasni 3
1 Ph.D Candidate of Transportation Engineering, Faculty of Civil Eng., Semnan University
2 Professor, Transportation Eng. Dept., Faculty of Civil Eng., Semnan University
3 Professor, Transportation Eng. Dept., Faculty of Civil Eng., Tarbiat Modares University
Abstract
In order to expand the application of roller Compacted concrete (RCC) in high speed roads, casting a thin layer of concrete with high skid resistance immediately the after implementation and compaction of RCC has been suggested. In the present study, the mechanical and fracture properties of this kind of two lift concrete pavement (2LCP) evaluated and compared with common single lift concrete pavements. Therefore, a thin layer of plain concrete and polypropylene fiber reinforced concrete with relative thickness of 30% of total pavement thickness has been casted of RCC pavement.. Compressive strength and mode I fracture tests were performed on samples after 28 days curing.

Result showed that the addition of polypropylene fibers to plain concrete reduces the compressive strength of concrete slightly. Also, replacement of normal concrete or fiber reinforced concrete with roller concrete in the upper layer of 2LCP did not have a significant negative effect on flexural strength and fracture of the specimens compared to single lift RCC pavement with equivalent thickness.

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Modares Civil Engineering journal
Volume 21, Issue 2
May and June 2021
Pages 7-19