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Structural Engineering and Mechanics
  Volume 74, Number 5, June10 2020, pages 589-600

Bond-slip constitutive model of concrete to cement-asphalt mortar interface for slab track structure
Miao Su, Gonglian Dai and Hui Peng

    The bonding interface of the concrete slab track and cement-asphalt mortar layer plays an important role in transferring load and restraining the track slab's deformation for slab track structures without concrete bollards in high-speed railway. However, the interfacial bond-slip behavior is seldom considered in the structural analysis; no credible constitutive model has been presented until now. Elaborating the field tests of concrete to cement-asphalt mortar interface subjected to longitudinal and transverse shear loads, this paper revealed its bond capacity and failure characteristics. Interfacial fractures all happen on the contact surface of the concrete track slab and mortar-layer in the experiments. Aiming at this failure mechanism, an interfacial mechanical model that employed the bilinear local bond-slip law was established. Then, the interfacial shear stresses of different loading stages and the load-displacement response were derived. By ensuring that the theoretical load-displacement curve is consistent with the experiment result, an interfacial bond-slip constitutive model including its the corresponding parameters was proposed in this paper. Additionally, a finite element model was used to validate this constitutive model further. The constitutive model presented in this paper can be used to describe the real interfacial bonding effect of slab track structures with similar materials under shear loads.
Key Words
    bond-slip model; interface; push-shear test, concrete; cement-asphalt mortar; slab track
Miao Su, Hui Peng: School of Civil Engineering, Changsha University of Science and Technology, NO. 960, Wanjiali South Road, Changsha 410114, China
Miao Su: Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720 USA
Gonglian Dai: School of Civil Engineering, Central South University, NO. 68, Shaoshan South Road, Changsha 410075, China

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