Effect of freeze–thaw on fatigue damage characteristics of cement emulsified bitumen mastic

2019 ◽  
pp. 1-16 ◽  
Author(s):  
Yunliang Li ◽  
Xin He ◽  
Haijiao Sun ◽  
Yiqiu Tan
Keyword(s):  
Fatigue Damage ◽  
Freeze Thaw ◽  
Damage Characteristics

scholarly journals Effect of freeze–thaw cycle on physical and mechanical properties and damage characteristics of sandstone

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Longxiao Chen ◽  
Kesheng Li ◽  
Guilei Song ◽  
Deng Zhang ◽  
Chuanxiao Liu
Keyword(s):  
Mechanical Properties ◽  
Shear Failure ◽  
Triaxial Compression ◽  
Physical And Mechanical Properties ◽  
Freeze Thaw ◽  
Damage Characteristics ◽  
Large Pore ◽  
Natural Rock ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

AbstractRock deterioration under freeze–thaw cycles is a concern for in-service tunnel in cold regions. Previous studies focused on the change of rock mechanical properties under unidirectional stress, but the natural rock mass is under three dimensional stresses. This paper investigates influences of the number of freeze–thaw cycle on sandstone under low confining pressure. Twelve sandstone samples were tested subjected to triaxial compression. Additionally, the damage characteristics of sandstone internal microstructure were obtained by using acoustic emission (AE) and mercury intrusion porosimetry. Results indicated that the mechanical properties of sandstone were significantly reduced by freeze–thaw effect. Sandstone’ peak strength and elastic modulus were 7.28–37.96% and 6.38–40.87% less than for the control, respectively. The proportion of super-large pore and large pore in sandstone increased by 19.53–81.19%. We attributed the reduced sandstone’ mechanical properties to the degenerated sandstone microstructure, which, in turn, was associated with increased sandstone macropores. The macroscopic failure pattern of sandstone changed from splitting failure to shear failure with an increasing of freeze–thaw cycles. Moreover, the activity of AE signal increased at each stage, and the cumulative ringing count also showed upward trend with the increase of freeze–thaw number.

Fatigue Damage Characteristics of Deformable Mirrors for Wavefront Correction

2016 ◽  
Vol 43 (11) ◽  
pp. 1105002
Author(s):  
陈丽霞 Chen Lixia ◽  
胡小川 Hu Xiaochuan ◽  
张 彬 Zhang Bin ◽  
孙年春 Sun Nianchun
Keyword(s):  
Fatigue Damage ◽  
Deformable Mirrors ◽  
Wavefront Correction ◽  
Damage Characteristics

scholarly journals Geomechanical and Acoustic Properties of Intact Granite Subjected to Freeze–Thaw Cycles during Water-Ice Phase Transformation in Beizhan’s Open Pit Mine Slope, Xinjiang, China

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2309 ◽  
Author(s):  
Yu Wang ◽  
Wenkai Feng ◽  
Huajian Wang ◽  
Jianqiang Han ◽  
Changhong Li
Keyword(s):  
Energy Balance ◽  
Fatigue Damage ◽  
Frequency Band ◽  
Open Pit Mine ◽  
Acoustic Properties ◽  
Open Pit ◽  
Cold Regions ◽  
Detection Techniques ◽  
Freeze Thaw ◽  
Energy Balance Approach

The deterioration of rock geomechanical behaviors subjected to freeze–thaw (F–T) action is a determining factor for rock engineering and rock structures in cold regions. In this work, taking six groups of granite obtained from an open pit mine as the research object, F–T cycle treatment, in-situ AE (acoustic emission) monitoring and ultrasonic detection techniques were performed to experimentally reveal the effects of F–T fatigue damage on the mechanical and acoustic properties of granite. The results indicate that the F–T action impacts the rock’s mesoscopic structure, deformation, strength, P and S-wave velocities, AE pattern and energy release. The accumulated AE counts and accumulated AE energy show a decreasing trend as the F–T cycle increases. The frequency spectrum revealed that the width of the low frequency band decreases and the high frequency band increases with increasing F–T cycles, indicating that there is an increase in large-scale cracks for a sample with high F–T treatment. In addition, energy balance analysis further illustrates the energy dissipation and release mechanism. The energy proportion used to drive the crack propagation is relatively small with high F–T treatment, and the final released energy becomes the minimum. The energy evolution characteristics analyzed by the energy balance approach is in good agreement with AE results. It is suggested that the F–T fatigue damage influences the rock energy storage and release characteristics and the instability of rock in the cold regions.

Fatigue damage characteristics of geocell-reinforced asphalt mixture

2021 ◽  
Vol 269 ◽  
pp. 121252
Author(s):  
Wang Xianrong ◽  
Zhang Xiedong ◽  
Zhu Yunsheng ◽  
Li Xiaowei
Keyword(s):  
Fatigue Damage ◽  
Asphalt Mixture ◽  
Damage Characteristics

Coupled effects of chemical environments and freeze–thaw cycles on damage characteristics of red sandstone

2016 ◽  
Vol 76 (4) ◽  
pp. 1481-1490 ◽  
Author(s):  
Feng Gao ◽  
Qiaoli Wang ◽  
Hongwei Deng ◽  
Jian Zhang ◽  
Weigang Tian ◽  
...  
Keyword(s):  
Red Sandstone ◽  
Freeze Thaw ◽  
Damage Characteristics

scholarly journals Further Investigation on Damage Model of Eco-Friendly Basalt Fiber Modified Asphalt Mixture under Freeze-Thaw Cycles

2018 ◽  
Vol 9 (1) ◽  
pp. 60 ◽  
Author(s):  
Wensheng Wang ◽  
Yongchun Cheng ◽  
Guirong Ma ◽  
Guojin Tan ◽  
Xun Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Splitting Tensile Strength ◽  
Stiffness Modulus ◽  
Freeze Thaw ◽  
Damage Characteristics ◽  
Indirect Tensile

The main distresses of asphalt pavements in seasonally frozen regions are due to the effects of water action, freeze-thaw cycles, and so on. Basalt fiber, as an eco-friendly mineral fiber with high mechanical performance, has been adopted to reinforce asphalt mixture in order to improve its mechanical properties. This study investigated the freeze-thaw damage characteristics of asphalt mixtures reinforced with eco-friendly basalt fiber by volume and mechanical properties—air voids, splitting tensile strength, and indirect tensile stiffness modulus tests. Test results indicated that asphalt mixtures reinforced with eco-friendly basalt fiber had better mechanical properties (i.e., splitting tensile strength and indirect tensile stiffness modulus) before and after freeze-thaw cycles. Furthermore, this study developed logistic damage models of asphalt mixtures in terms of the damage characteristics, and found that adding basalt fiber could significantly reduce the damage degree by about 25%, and slow down the damage grow rate by about 45% compared with control group without basalt fiber. Moreover, multi-variable grey models (GM) (1,N) were established for modelling the damage characteristics of asphalt mixtures under the effect of freeze-thaw cycles. GM (1,3) was proven as an effective prediction model to perform better in prediction accuracy compared to GM (1,2).

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