Study on interlayer bonding coefficient of CPC-AC composite pavement(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年01期
- Page:
- 1-8
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Study on interlayer bonding coefficient of CPC-AC composite pavement
- Author(s):
- GUO Yin-chuan; SHEN Ai-qin; LI Bo-cheng; ZHAO Yao-hui
- 1. Key Laboratory of Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Louisiana Transportation Research Center, Louisiana State University, Baton Rouge LA70803, Louisiana, USA
- Keywords:
- road engineering; composite pavement; bending test; interlayer bonding coefficient; partially-bonded two-layered beam
- PACS:
- U416.01
- DOI:
- -
- Abstract:
- To study interlayer bonding behavior and explore the representation and solution of the interlayer bonding state of CPC-AC (cross-tensioned prestressed concrete and asphalt concrete composite pavement), the spacing changes of neutral axis were proposed to characterize interlayer bonding state, and the calculation formulas of interlayer bonding coefficient η of partially bonded CPC-AC was derived. The three-point bending tests and simulation tests of double-layer beam at low temperature of indoor single beam were designed, and calculation parameters such as elasticity modulus of signal beam and flexural rigidity of partially bonded double-layer beam were determined. In order to analyze the interlayer bonding coefficient η, representing interlayer bonding ability of composite pavement, three treatments such as grooving, chiseling and crash stone were set on the CPC deck. Interlayer bonding adopted SBS modified asphalt and SBS modified asphalt synchronous chip sealing layer with different spraying volume, respectively. The feasibility of the interlayer bonding coefficient η representing interlayer bonding behavior of composite pavement was proved by shear test. The results show that η can be obtained by the indoor bending simulation test of double-layer beam and calculating formula of the flexural rigidity of double-layer beams. With different interlayer treatments, the change rules of η are in agreement with the result of shear tests, and therefore the η has the capability to characterize interlayer bonding state of CPC-AC composite pavement. The interlayer bonding coefficient is largely different with different treatment and interlayer bonding. The best bonding state for CPC is using crash stone and SBS modified asphalt tack coat, the spraying volume amount of asphalt is 0.4 kg/m2, and the interlayer bonding coefficient is 0.463.
Last Update: 2018-02-05