scholarly journals Deformation superposition effect of asphalt mixture based on experiments and micromechanical modeling

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Chun Li ◽  
Xinxing Bian ◽  
Qifeng Dong ◽  
Huining Xu
Keyword(s):  
Asphalt Mixture ◽  
Micromechanical Modeling ◽  
Penetration Test ◽  
Wheel Load ◽  
Heavy Load ◽  
Micromechanical Property ◽  
Micromechanical Characteristics ◽  
Internal Reason ◽  
Penetration Tests ◽  
Superposition Effect

Abstract Under multi-wheel heavy load, the asphalt mixture is prone to exhibit the deformation superposition effect, which exacerbates the damage of pavement structure. Multi-point penetration tests and numerical simulations by discrete element method (DEM) are performed to investigate the deformation superposition effect and micromechanical characteristics of asphalt mixture. The effect of wheel spacing, wheel group, and the evolution of micromechanical deformation superposition behavior are analyzed. Results indicate that the deformation superposition resistance of the asphalt mixture under the multi-wheel load decreases dramatically with the decrease in wheel spacing and the increase in the number of wheels, specifically the wheel spacing is 54 mm and the number of wheels is 4. The DEM simulations reflect the micromechanical property of asphalt mixture in the multi-point penetration test. The reduction of tensile chains is the internal reason for asphalt mixture deformation superposition, indicating the decrease of the adhesive strength of the material. A remarkably positive correlation is found between the reduction of the tensile chain and the deformation effect coefficient. In the process of superposition, the aggregate skeleton force chains are gradually destroyed and decrease to zero until cracking. The numerical simulation outcome is consistent with the laboratory penetration test outcome.

Deformation Superposition Effect of Asphalt Mixture Based on Experiments and Micromechanical Modeling

2021 ◽  
Author(s):  
Chun Li ◽  
Xinxing Bian ◽  
Qifeng Dong ◽  
Huining Xu
Keyword(s):  
Asphalt Mixture ◽  
Micromechanical Modeling ◽  
Penetration Test ◽  
Wheel Load ◽  
Heavy Load ◽  
Micromechanical Property ◽  
Micromechanical Characteristics ◽  
Internal Reason ◽  
Penetration Tests ◽  
Superposition Effect

Abstract Under multi-wheel heavy load, the asphalt mixture is prone to exhibit the deformation superposition effect, which exacerbates the damage of pavement structure. Multi-point penetration tests and numerical simulations by discrete element method (DEM) are performed to investigate the deformation superposition effect and micromechanical characteristics of asphalt mixture. The effect of wheel spacing, wheel group, and the evolution of micromechanical deformation superposition behavior are analyzed. Results indicate that the deformation superposition resistance of the asphalt mixture under the multi-wheel load decreases considerably with the increase in wheel spacing and the number of wheels. The DEM simulations reflect the micromechanical property of asphalt mixture in the multi-point penetration test. The reduction of tensile chains is the internal reason for asphalt mixture deformation superposition, indicating the decrease of the adhesive strength of the material. A remarkably positive correlation is found between the reduction of the tensile chain and the deformation effect coefficient. In the process of superposition, the aggregate skeleton force chains are gradually destroyed and decrease to zero until cracking. The numerical simulation outcome is consistent with the laboratory penetration test outcome.

Research on Shear Strength for Asphalt Mixture by the Uniaxle Penetration Test Method

2011 ◽  
Vol 97-98 ◽  
pp. 220-225 ◽  
Author(s):  
Yang Cai
Keyword(s):  
Shear Strength ◽  
High Temperature ◽  
Linear Correlation ◽  
Shear Test ◽  
Asphalt Mixture ◽  
Test Method ◽  
Penetration Test ◽  
Triaxial Shear Test ◽  
Different Temperatures ◽  
Penetration Tests

With uniaxle penetration test method and Triaxial Shear method test, the shear strengths for asphalt mixture were analyzed. It turns out that the result of triaxial shear test is a little conservative than that of uniaxle penetration test. Then reasonable structure factor for shear strength should be considered by uniaxle penetration test. Uniaxle penetration tests at different temperatures revealed there were a linear correlation between shear strength and temperature.The asphalt was not the main fator of shear strength at high temperature.

Rutting Treatment Technology of Asphalt Pavement of Abrupt Slope Section in Heavy Load and High Temperature Zone

2011 ◽  
Vol 287-290 ◽  
pp. 858-861
Author(s):  
Hui Wang ◽  
Zhou Qing Zhao ◽  
Jian Zeng
Keyword(s):  
High Temperature ◽  
High Performance ◽  
Polyester Fibre ◽  
Asphalt Mixture ◽  
Good Control ◽  
Treatment Technology ◽  
Heavy Load ◽  
Test Road ◽  
Overlay Design ◽  
New Material

Aiming at the characteristics of pavement rutting damage of test road under the condition of heavy load and abrupt slope, an overlay design scheme and a new overlay material with high performance was proposed. The new material is PG82 modified asphalt SMA-13 added polyester fibre which can significantly improve the high temperature performance of asphalt mixture under severe environment, and its strength and crack resistance are superior to normal SMA-13. Tracking survey of test road shows that the pavement performances keeps good and rutting is under good control. Therefore those measurements are successful and can be a reference to similar projects.

An Intelligent Nail Design for Lithium Ion Battery Penetration Test

2016 ◽  
Author(s):  
Tanvir R. Tanim ◽  
Mayank Garg ◽  
Christopher D. Rahn
Keyword(s):  
Position Control ◽  
Short Circuit ◽  
Time History ◽  
Lithium Ion ◽  
Penetration Test ◽  
Electrically Conductive ◽  
Multiple Sensors ◽  
Efficient Data ◽  
History Of ◽  
Penetration Tests

Internal short-circuiting is the most dangerous abuse scenario for lithium ion batteries. A nail penetration test simulates the internal short circuit process by penetrating a test cell/pack with an electrically conductive nail. Pass or failure of the cell and/or chemistry is determined by the presence of smoke or flame following penetration. To understand and eliminate the safety concerns arising from the internal shorts, it is important to fully understand the cell/pack dynamics during the shorting process. Gathering useful data at the point of penetration during nail penetration tests is very challenging due to the inherent destructive nature of the test. This paper presents an intelligent nail (iNail) design consisting of four parts where multiple sensors (thermo-couples, strain gauges, etc.) can be conveniently placed for reliable and efficient data collection. The time history of temperature distributions through the cell/pack thickness can be recorded with the iNail without position control of the nail penetration tester, greatly simplifying the test. A prototype stainless steel iNail is manufactured with three embedded thermocouples. Nail penetration tests are conducted on fully charged 4 Ah gr/NCM pouch cells. The iNail successfully recorded the temperature time history at the penetration point during the tests. Pack level nail penetration tests (three pouch cells in parallel) were also performed with iNail temperature measurements.

Review of advances in micromechanical modeling of aggregate–aggregate interactions in asphalt mixtures

2007 ◽  
Vol 34 (2) ◽  
pp. 239-252 ◽  
Author(s):  
Zhanping You ◽  
Qingli Dai
Keyword(s):  
Finite Element ◽  
Particle Interaction ◽  
Asphalt Mixture ◽  
Complex Mixture ◽  
Element Model ◽  
Laboratory Simulation ◽  
Micromechanical Modeling ◽  
Discrete Elements ◽  
Interacting Particles ◽  
Work Done

This paper presents a comprehensive review of the work done by a number of researchers on the modeling of asphalt mixture. Included are some of the earliest models such as those with non-interacting particles (models with and without geometry specified), models with particle interaction, and some new models developed in recent years. The paper focuses on the description and comparison of the most recently developed finite element network model (FENM), a clustered discrete element model (DEM), and a micromechanical finite element model (FEM) used in micromechanical modeling of asphalt mixture. These models consider the complex mixture microstructure and aggregate–aggregate interaction. These models are demonstrated and applications of the advances are provided, where virtual laboratory simulation and laboratory tests were employed. The feasibility of nanotechnology application in asphalt mixture is also briefly discussed.Key words: micromechanical modeling, micromechanics, aggregate–aggregate interaction, finite elements, discrete elements, asphalt mixture.

Comparison of Test Methods for High-Temperature Performance of Asphalt Mixtures

2013 ◽  
Vol 361-363 ◽  
pp. 1629-1634 ◽  
Author(s):  
Guo Xiong Wu ◽  
Xiao Ke Zhang ◽  
Rui Lin Wang
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Shear Test ◽  
Asphalt Mixture ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Penetration Test ◽  
Shear Elastic Modulus ◽  
Temperature Performance ◽  
Slant Shear

Through a comparative study of high-temperature asphalt mixture performance by three methods: the standard rutting test, uniaxial penetration test on cylindrical specimens, and slant shear test, this paper displays that the shear elastic modulus gained by both cylindrical uniaxial penetration test and slant shear test can reflect well the properties of shear deformation of asphalt mixture under high temperature. However, there are certain limitations in these test methods.

The Deformation Analysis about Guide Way Contact of Large Span and Heavy Load Cross-Rail

2010 ◽  
Vol 26-28 ◽  
pp. 93-97 ◽  
Author(s):  
Yong Sheng Zhao ◽  
Xue Jiao Dong ◽  
Tie Neng Guo ◽  
Wen Tong Yang
Keyword(s):  
Simulation Method ◽  
Numerical Control ◽  
Deformation Condition ◽  
Deformation Analysis ◽  
Load Curve ◽  
Heavy Load ◽  
Large Span ◽  
Finite Element Software ◽  
Rail Structure ◽  
Superposition Effect

The article used the large span and heavy load cross-rail of some machine tools plant’s heavy-type numerical control milling planer for research object, by using the finite element software to build the model and force analysis. It also researched the force distribution and deformation condition of the large span motion girder under the actual working condition. It considered the slide carriage superposition effect to build the describing method and establishing process of the large span load curve by contacting analysis and restraining analysis, and got the knifepoint trajectory deformation. The research provided the sufficient theory basis and simulation method for designing improvement of cross-rail structure and got a perfect arch in advance.

Mix Design and Performance Verification of Asphalt Mixture to Improve the Service Performance in Inner Mongolia Heavy Asphalt Pavement

2016 ◽  
Vol 858 ◽  
pp. 312-315
Author(s):  
Jing Wang ◽  
Jin Yan ◽  
Miao Miao Tian ◽  
Ya Fei Li
Keyword(s):  
Inner Mongolia ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Service Performance ◽  
Mix Design ◽  
Heavy Load ◽  
Performance Verification ◽  
One Belt One Road ◽  
And Performance ◽  
The One

With the implementation of the "One Belt, one Road" national strategy, the western region traffic can develop rapidly. This paper aims to improve the service performance in Inner Mongolia cold and heavy-load asphalt pavement through research. The mix design and performance verification of Zhuozi mountain mixture is the main line, in order to get a good fit to the local situation, and draw the key technical indicators of the design.

A Method for Temperature Correction of HMA Dynamic Modulus

2012 ◽  
Vol 178-181 ◽  
pp. 1615-1618 ◽  
Author(s):  
Ya Li Ye ◽  
Chuan Yi Zhuang ◽  
Ren Feng Zhang
Keyword(s):  
Dynamic Modulus ◽  
Asphalt Mixture ◽  
Temperature Correction ◽  
Reference Temperature ◽  
Wheel Load ◽  
Pavement Deterioration ◽  
Design Guide ◽  
Falling Weight ◽  
Asphalt Concrete Pavement

HMA dynamic modulus is one of key inputs to the Mechanistic-Empirical Pavement Design Guide. In order to analyze and evaluate bearing capacity of asphalt concrete pavement and to determinate the rules of pavement deterioration of modulus of asphalt layer under repeated wheel load and ambient, temperature correction for HMA is applied to the modulus so as to compare them with the same temperature. In order to get temperature correction coefficients for HMS moduli, a method of temperature correction for HMA moduli was put forward. In this method, the specimen of asphalt mixture or HMA cores from in-situ pavements were tested by Superpave Simple Performance Tester(SPT), or falling weight deflection(FWD) was tested on the site of in-situ pavements. The correlation between HMA dynamic modulus and temperature was regressed, and then dynamic modulus regression model was put forward. Results show that exponential function was fitted to the data to determine and adjust the modulus to a reference temperature, the recommendation regression equation can reflect the features of asphalt mixture at the reference temperature.

scholarly journals STRENGTH CHARACTERIZATION OF FOUNDATION SOILS AT FEDERAL UNIVERSITY LOKOJA BASED ON STANDARD PENETRATION TESTS DATA

2017 ◽  
Vol 36 (3) ◽  
pp. 671-676
Author(s):  
JA Sadeeq ◽  
AB Salahudeen
Keyword(s):  
Soil Properties ◽  
Estimation Method ◽  
Average Energy ◽  
Standard Penetration Test ◽  
Analytical Models ◽  
Penetration Test ◽  
Strength Characterization ◽  
Penetration Tests ◽  
Allowable Bearing Pressure

Strength characteristics of foundation soils in the Permanent site of the Federal University Lokoja in Kogi State were evaluated based on standard penetration test (SPT) results using some conventional analytical models proposed by different researchers. The study was carried out in order to take precise engineering decisions on the type of foundations suitable for the proposed structures and to determine the optimal depth of foundation embedment.  The SPT N-values were first corrected to the standard average energy of 60% (N60) before they were used to correlate soil properties. Evaluation of the soil properties were done at foundation embedment depths of 0.6, 2.1 and 3.6 m. Results show that bearing capacity generally increased with boring depth. Based on the Meyerhof allowable bearing pressure estimation method, foundation pressures in the range of 150 – 600  kN/m2 were evaluated for use in the study area at shallow depths (depths in the range of 0.6 - 3.6 m).http://dx.doi.org/10.4314/njt.v36i3.2

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