Abstract
In order to investigate the creep performance of cement asphalt mortar (CA mortar), the field sampling of CA mortar cylinder samples was produced, and all samples were tested on WDW series electric universal testing machine by using uniaxial static creep test at 25°C, and the load stress levels were 0.05 MPa, 0.1 MPa, 0.3 MPa, and 0.5 MPa. The greater the load is, the bigger the creep deformation is. The creep performance was simulated by using Burgers model, and the correlation coefficients between fitting results of Burgers model and experimental results are all greater than 0.9. Based on the requirements of finite element software, the Prony series of Burgers model was obtained, and the short-term creep process of CA mortar was simulated by the finite element software ANSYS. The relative error between simulation results and experimental data is not more than 2.5%, which indicates that the short-creep process of CA mortar can be simulated by ANSYS software. The study results can improve the structural design theory of slab track.
Highlights
The nonballast slab track consists of concrete roadbed, reinforced concrete track slab, and cement asphalt mortar (CA mortar) injected between the roadbed and track slab [1]
With the rapid development of high-speed railway, cement and asphalt mortar (CA mortar) which is the key material of the cushion layer of ballastless slab track is widely used in high-speed railways in Japan [2, 3], Germany, France, and China [4], and it consists of cement, emulsified asphalt, fine aggregates, water, and admixtures and is an organic– inorganic composite material formed by mechanical mixing, whose main functions are supporting and adjustment, buffer and load transfer, blocking cracking, and providing elasticity and resistance for track structure [5]
The short-term creep properties of CA mortar were studied by the independently uniaxial static creep experiment, the creep properties of CA mortar were fitted by Burgers model, and the short-term creep process was simulated by ANSYS software
Summary
The nonballast slab track consists of concrete roadbed, reinforced concrete track slab, and cement asphalt mortar (CA mortar) injected between the roadbed and track slab [1]. CA mortar is very important for the safety, stability, and comfortable degree of high-speed railway [6]. Wang et al [7] investigated the compressive strength developing process and the microstructure of CA mortar. Yutaka et al [8] introduce the CA mortar used in cold weather, and Kazuyosi and Yosio [9] and Wang et al [10] studied the compressive strength of CA mortar and its temperature susceptibility. Liu et al [11] studied the static and dynamic mechanical properties of CA mortar. Xu et al [13] investigated the dynamic compression damage properties of CA mortar under different strain rates. Creep property is an important index for evaluating the viscoelastic behavior of CA mortar, and according to survey, after the high-speed railway has been operated for 3–5 years, the CA mortar layer will have unrecoverable deformation. The study on the creep properties of CA mortar is very necessary
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