Effects of temperature and loading rate on the compressive behaviour of CA mortar

Wu, Xi; Wang, Jinfeng; Xu, Rongqiao; Chen, Yi-ri

doi:10.1680/jmacr.15.00451

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…In addition, the prestressed tendons of the track slab were tensioned at 7 d, and the ambient relative humidity in the shrinkage and creep model was 70%. The initial relative humidity of CA mortar is 100%, and the average strength is 11.35 MPa [ 49 ].…”

Section: Finite Element Modelingmentioning

confidence: 99%

Numerical Investigation of Interlaminar Stress of CRTS II Slab Ballastless Track Induced by Creep and Shrinkage of Concrete

Zheng

Liu

et al. 2022

Materials

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The secondary development of ABAQUS was carried out to calculate the shrinkage and creep of concrete, and a finite element model of the China Railway Track System (CRTS) II slab ballastless track was established. Then, the interlaminar stress of CRTS II slab ballastless track at different ages of the track slab during laying (AOTSL) caused by concrete shrinkage and creep was studied. The obtained results showed that the stress redistribution occurred in the sliding layer, which resulted in the generation of a gap. Although the gap length was slightly reduced due to the shear cogging, the sliding layer at the slab edge is more prone to produce gaps. Under the effect of shrinkage and creep of the ballastless track, large additional shear stress, up to 0.676 MPa, was induced at the interface between CA mortar and the track slab. Meanwhile, the appearance of additional vertical and lateral forces of the shear cogging was caused by the shrinkage and creep of the ballastless track. Additionally, by further analysis, the recommended AOTSL ranges from 120 days to 180 days.

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Section: Finite Element Modelingmentioning

confidence: 99%

Numerical Investigation of Interlaminar Stress of CRTS II Slab Ballastless Track Induced by Creep and Shrinkage of Concrete

Zheng

Liu

et al. 2022

Materials

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“…e compressive strength, tensile strength, dynamical modulus, and stress-strain response of CAM with different asphalt to cement ratio were experimentally studied when the temperature was varied. e experimental results indicated that (1) the mechanical properties of CAM decreased with the increasing temperature [2,9], (2) the temperature sensitivity of CAM was closely related to the asphalt to cement ratio [11,12], and (3) the temperature-sensitive behavior of CAM was also found to be correlated with the loading rate and water pressure [13][14][15]. According to the research, the behavior of CAM under low and high temperature can be well interpreted and reasonably predicted by the proposed model.…”

Section: Introductionmentioning

confidence: 99%

Temperature Sensitivity of Mechanical Properties of Cement Asphalt Mortar with Nanoparticles

Fan

Wang

2020

Advances in Civil Engineering

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Cement asphalt mortar (CAM) in high-speed lines is subjected to varying environmental conditions, which lead to the deterioration of CAM. e nanoparticles of nano-SiO 2 and nano-TiO 2 are added to improve the performance of CAM, and the temperature sensitivity of CAM with nanoparticles is primarily studied in this paper. e flexural strength and compressive strength of CAM with and without nano-SiO 2 and nano-TiO 2 were measured and compared to study the effect of nanoparticles on the performance of CAM subjected to different temperatures. Temperature sensitivity factors of flexural and compressive strength based on Arrhenius model were proposed to evaluate the temperature dependence of CAM by nanoparticles. Furthermore, the microstructure of hardened CAM was studied using scan electronic microscope (SEM) to investigate the mechanism of temperature sensitivity of CAM with and without nanoparticles. e results indicated that the flexural and compressive strength of CAM with and without nanoparticles decreased with the increasing temperature; however, the decreasing rate of strength with temperature was different in CAM with and without nanoparticles. e reduction in the decreasing rate of strength was obtained by using nano-SiO 2 rather than nano-TiO 2 in CAM. Based on the SEM results, the free asphalt was seen to be greatly reduced in the CAM with nano-SiO 2 , suggesting a positive effect of nano-SiO 2 on the mitigation of temperature sensitivity of CAM.

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“…To investigate how track slab damages initiate and how they affect vehicle-track system dynamics and track irregularities, previous studies carried out numerical simulations [3][4][5][6][7][8][10][11][12][13][14][15][16], full-scale tests [9,[17][18][19], and field tests [15,20,21]. These studies shed some light on repair works for defects, slab maintenance, and life-cycle management of slab track.…”

Section: Introductionmentioning

confidence: 99%

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

Liu

2019

Sensors

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Slab track is widely used in many newly built high-speed rail (HSR) lines as it offers many advantages over ballasted tracks. However, in actual operation, slab tracks are subjected to operational and environmental factors, and structural damages are frequently reported. One of the most critical problems is temperature-induced slab-warping deformation (SWD) which can jeopardize the safety of train operation. This paper proposes an automatic slab deformation detection method in light of the track geometry measurement data, which are collected by high-speed track geometry car (HSTGC). The characteristic of track vertical irregularity is first analyzed in both time and frequency domain, and the feature of slab-warping phenomenon is observed. To quantify the severity of SWD, a slab-warping index (SWI) is established based on warping-sensitive feature extraction using discrete wavelet transform (DWT). The performance of the proposed algorithm is verified against visual inspection recorded on four sections of China HSR line, which are constructed with the China Railway Track System II (CRTSII) slab track. The results show that among the 24,806 slabs being assessed, over 94% of the slabs with warping deformation can be successfully identified by the proposed detection method. This study is expected to provide guidance for efficiently detecting and locating slab track defects, taking advantage of the massive track inspection data.

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Effects of temperature and loading rate on the compressive behaviour of CA mortar

Cited by 9 publications

References 27 publications

Numerical Investigation of Interlaminar Stress of CRTS II Slab Ballastless Track Induced by Creep and Shrinkage of Concrete

Numerical Investigation of Interlaminar Stress of CRTS II Slab Ballastless Track Induced by Creep and Shrinkage of Concrete

Temperature Sensitivity of Mechanical Properties of Cement Asphalt Mortar with Nanoparticles

Identification of Temperature-Induced Deformation for HSR Slab Track Using Track Geometry Measurement Data

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