Coupled Thermo-Hydro-Mechanical Analysis of Freeze–Thaw Behavior of Pavement Structure over a Box Culvert

2017 ◽  
Vol 2656 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Bin Luo ◽  
Tatsuya Ishikawa ◽  
Tetsuya Tokoro ◽  
Hao Lai
Keyword(s):  
Mechanical Analysis ◽  
Freeze Thaw ◽  
Pavement Structure ◽  
Box Culvert

scholarly journals Comparison of Two Typical Professional Programs for Mechanical Analysis of Interlayer Bonding of Asphalt Pavement Structure

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Shuangxi Li ◽  
Liang Tang ◽  
Kang Yao
Keyword(s):  
Asphalt Pavement ◽  
Mechanical Analysis ◽  
Layered System ◽  
Professional Programs ◽  
Comprehensive Comparison ◽  
Modeling Calculation ◽  
Pavement Structure ◽  
Calculation Processing ◽  
Interlayer Bonding ◽  
Selection Of

The mechanical analysis of interlayer bonding problem of asphalt pavement is performed by the elastic layered system theory or finite element method (FEM); then, a lot of specialized programs based on the above theories emerged successively, of which BISAR3.0 and EverStressFE are quite representative. In order to further clarify the characteristics of BISAR3.0 and EverStressFE for investigating interlayer bonding problem of asphalt pavement, this paper will carry out a comprehensive comparison from the specific realization viewpoint, such as the principle of interlayer bonding, modeling, calculation processing, and result treatment, and a specific example will be given to compare and analyze their functions. The results indicate that the two programs have certain comparability in analyzing the interlayer bonding problem of asphalt pavement, which will contribute to the foundation for the rational selection of asphalt pavement structure mechanical analysis program.

scholarly journals Influence of Freeze-Thaw Cycles on Mechanical Response of Levee Pavement

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shuan Guo ◽  
Zheng Lu ◽  
Guokun Liu ◽  
Baoli Zhuang ◽  
Yongfeng Fan ◽  
...  
Keyword(s):  
Moisture Content ◽  
Mechanical Response ◽  
Triaxial Compression ◽  
Initial Moisture Content ◽  
Dry Density ◽  
Test Results ◽  
Freeze Thaw ◽  
Temperature Range ◽  
Pavement Structure ◽  
The Stability

The freeze-thaw cycles cause deterioration in mechanical properties of levee soil and further endanger the pavement structure on the embankment. This study attempts to comprehensively understand the mechanical response of pavement after freeze-thaw cycles. In this paper, the freeze-thaw cycles test under an open system was carried out, and then the triaxial compression test was conducted. Based on the test results, the effects of freeze-thaw cycles, temperature range, initial dry density, and initial moisture content of embankment soil on the mechanical response of road structure after freeze-thaw were calculated and analyzed. Finally, the stability of the slope of the levee was evaluated. The results show that the number of freeze-thaw cycles has the most significant impact on the mechanical response of pavement, the stress and strain of the structural layers vary in different ranges, and the pavement deflection increases by 5 times after 7 freeze-thaw cycles. However, the initial dry density and initial moisture content of the soil have little influence on the pavement structure, and the temperature range will exert an influence when it exceeds a certain threshold.

scholarly journals Effect of Freeze-Thaw Cycle on Shear Strength of Lime-Solidified Dispersion Soils

2020 ◽  
Vol 6 (1) ◽  
pp. 114-129 ◽  
Author(s):  
Meng Yao ◽  
Qing Wang ◽  
Bing Ma ◽  
Yaowu Liu ◽  
Qingbo Yu ◽  
...  
Keyword(s):  
Shear Strength ◽  
Mechanical Strength ◽  
Saline Soil ◽  
Mechanical Analysis ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Freeze Thaw ◽  
Sem Image ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

The freeze-thaw cycle of saline soil in the seasonal frozen area will produce diseases such as frost heave and thaw settlement, road frost boiling, collapse and uneven settlement. In order to reduce the occurrence of these undesirable phenomena, it is often necessary to improve the saline soil in engineering. In this paper, the typical carbonate saline soil in the west of Jilin Province, China is taken as the research object. By adding different content of lime (0%, 3%, 6%, 9%, 12%, 15%), the change of mechanical strength of lime solidified saline soil under different freeze-thaw cycles (0, 1, 3, 6, 10, 30, 60 times) is studied. The mechanical analysis is carried out by combining particle size analysis test and SEM image. The test results show that although repeated freeze-thaw cycles make the soil structure loose and the mechanical strength greatly reduced, the soil particles agglomerate obviously after adding lime, its dispersion is restrained by the flocculation of clay colloid, and the shear strength of soil is improved by the increase of the cohesive force between clay particles, and the optimal lime mixing ratio of the saline soil in this area is 9%.

scholarly journals Numerical simulation of degradation of porous building materials caused by freeze-thaw cycles

2019 ◽  
Vol 282 ◽  
pp. 02090
Author(s):  
Jiří Maděra ◽  
Jaroslav Kruis
Keyword(s):  
Numerical Simulation ◽  
Building Materials ◽  
Damage Model ◽  
Mechanical Analysis ◽  
Structural Elements ◽  
Volume Changes ◽  
Porous Building Materials ◽  
Freeze Thaw ◽  
Numerical Example ◽  
Isotropic Damage

Freeze-thaw cycles in porous building materials are studied in this contribution. Degradation and durability of many building materials as well as structural elements are tightly connected with the freeze-thaw cycles. The porosimetry curve and Gibbs-Thomson equation are used for estimates of volume changes caused by the freeze-thaw cycles. The volume changes are used in mechanical analysis based on the isotropic damage model. Numerical example documents the approach proposed.

scholarly journals Comparison of temperature distributions in road pavement obtained in field tests and using transient thermal analysis

2019 ◽  
Vol 262 ◽  
pp. 05007 ◽  
Author(s):  
Jarosław Górszczyk ◽  
Konrad Malicki
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Field Tests ◽  
Field Measurements ◽  
Mechanical Analysis ◽  
Transfer Model ◽  
Road Pavement ◽  
Temperature Distributions ◽  
Pavement Structure ◽  
Transient Thermal

The paper presents the results of comparative analyzes of temperature distributions in the pavement structure. The distributions were determined in field measurements and transient thermal analysis.The phenomenon of thermal conduction in a road pavement is described by the Fourier-Kirchhoff heat transfer equation. The temperature distribution was analyzed at several depths of the pavement structure. The results of calculations are presented in the form of temperature profiles and graphs of temperature variability. The heat transfer model applied in the qualitative aspect correctly shows the heat transfer in the pavement structure, however in quantitative terms it requires calibration to local climatic and material conditions. Knowledge of the temperature distribution in the pavement is very important for the design and mechanical analysis of pavement structure.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Soil Response during Globally Drained and Undrained Freeze–Thaw Cycles under Deviatoric Loading

2021 ◽  
Vol 147 (2) ◽  
pp. 06020030
Author(s):  
Sang Yeob Kim ◽  
Junghee Park ◽  
Wonjun Cha ◽  
Jong-Sub Lee ◽  
J. Carlos Santamarina
Keyword(s):  
Soil Response ◽  
Freeze Thaw

Prediction of Temperature Field of Asphalt Pavement Structure

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Zhizhong Zhao ◽  
Mengchen Li ◽  
Yu Wang ◽  
Wenwen Chen ◽  
Yulong Zhao ◽  
...  
Keyword(s):  
Temperature Field ◽  
Asphalt Pavement ◽  
Pavement Structure
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