Study on spalling of CRCP punch-out area based on two scale model(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:
- 32-40
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Study on spalling of CRCP punch-out area based on two scale model
- Author(s):
- ZHAO Quan-man; ZHANG Hong-liang; GAO Jiang-ping; JIA Zhao-xia
- 1. School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China；2. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
- Keywords:
- road engineering; punch-out; two scale model; CRCP; discrete element method; spalling; influence factor
- PACS:
- U416
- DOI:
- -
- Abstract:
- In order to study the spalling mechanism of concrete in continuous reinforced concrete pavement (CRCP) punch-out area, two-scale model of discrete element method on macro-scale and finite element method on a meso-scale was applied. Firstly, based on the analysis of concrete spalling reasons, spalling was classified into delamination spalling and shears spalling, and mechanics model of spalling was built. Secondly, under the consideration that cement concrete was consisted by aggregates, binding materials and their interface on a meso-scale, numerical simulation test of the compressive strength was made. Meso-structure parameters of concrete of different strength grades were obtained by continuously debug. Based on its parameters, concrete flexural tensile strength test and shear strength test were simulated numerically on a meso-scale. Elastic modulus, flexural tensile strength and shear strength were obtained, and the numerical simulation results were compared with laboratory test results, and the obtained parameters were used in finite element model and analysis of spalling mechanism of concrete. Finally, considering the characteristics of CRCP punch-out area, the mechanics model of CRCP on a macro-scale was established through finite element method to study spalling of CRCP punch-out area under vehicle load, moisture gradient and temperature gradient. Influence of meso-structure parameters concrete (such as cement content, cement strength, and interface strength) and macro influence factors (such as bottom void of pavement, modulus of base course, and modulus of subgrade) on spalling of CRCP punch-out area was analyzed. The results show that the simulated test results on a meso-scale fit well with the laboratory test results. Shear spalling is hard to take place and delamination spalling is easy to take place under vehicle load, moisture gradient while temperature gradient. Concrete strength attenuation under the influence of outside environment, overload and low modulus of subgrade are the main reasons for spalling. Sustainable material types and high strength cement can effectively reduce spalling.
Last Update: 2018-02-06