Full range I/II fracture behavior of asphalt mixtures containing RAP and rejuvenating agent using two different 3-point bend type configurations

2022 ◽  
Vol 314 ◽  
pp. 125590
Author(s):  
Seyed Ataollah Saed ◽  
Hamid Reza Karimi ◽  
Sina Mousavi Rad ◽  
M.R.M. Aliha ◽  
Xijun Shi ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Full Range ◽  
Asphalt Mixtures ◽  
Point Bend

scholarly journals Fracture Behavior Analysis of Semi-Circular Bending Test

2019 ◽  
Vol 271 ◽  
pp. 03007
Author(s):  
David Renteria ◽  
Shadi Saadeh ◽  
Enad Mahmoud
Keyword(s):  
Fracture Behavior ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Random Generation ◽  
Crack Initiation And Propagation ◽  
Air Voids ◽  
Generation Technique ◽  
Initiation And Propagation ◽  
Scb Test

The objective of this paper is to investigate the effect of air voids on the fracture properties of asphalt mixtures using SCB test in Discrete Element Method (DEM). Superpave and Coarse Matrix High Binder (CMHB) mixtures gradation were used to generate the percentages of aggregate, mastic, and air voids within the specimens. Aggregates and air voids were randomly generated for each asphalt mixture case. Model results illustrate that the crack initiation and propagation is controlled by the location of the aggregate particles and air voids in the mixture. Additionally, the absence of air voids above the tip of the notch increases the stiffness of the sample and increase its resistance to failure. The novelty of using DEM and the random generation technique for generating numerical specimens proved to be a useful approach in investigating the properties of the mastic, aggregate and interface as they relate to fracture of asphalt mixtures.

Investigation of Fracture Behavior of Recycled Asphalt Mixtures Using a Discrete Element Computational Model

2021 ◽  
pp. 1197-1204
Author(s):  
Meng Xu ◽  
Jia-Liang Le ◽  
Tianhao Yan ◽  
Mugurel Turos ◽  
Mihai Marasteanu ◽  
...  
Keyword(s):  
Computational Model ◽  
Fracture Behavior ◽  
Discrete Element ◽  
Asphalt Mixtures ◽  
Recycled Asphalt

Effect Of Aggregate Content On Fracture Behavior Of Concrete

1995 ◽  
Vol 409 ◽  
Author(s):  
Y. Xi ◽  
F.E. Amparano ◽  
Zongjin Li
Keyword(s):  
Fracture Energy ◽  
Fracture Process ◽  
Fracture Behavior ◽  
Fracture Process Zone ◽  
Volume Fraction ◽  
Process Zone ◽  
Aggregate Content ◽  
Grain Structures ◽  
Point Bend ◽  
Two Parameters

AbstractEffect of aggregate content on fracture behaviors of concrete is studied by testing on geometrically similar three-point bend beams. The results are analyzed by using a size effect method in which the fracture behavior of concrete is characterized by two parameters, fracture energy Gf and effective fracture process zone cf. Test results showed that with increasing volume fraction of aggregate in the range 45% - 75%: (1) the modulus of elasticity of concrete decreases slightly, (2) fracture energy Gf increases, but the rate is very small; (3) the size of the fracture process zone, cf, decreases, which may be explained by changes in coarseness of grain structures defined in terms of mosaic patterns.

scholarly journals Numerical Simulation of Crack Propagation in Flexible Asphalt Pavements Based on Cohesive Zone Model Developed from Asphalt Mixtures

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1278 ◽  
Author(s):  
Pengfei Liu ◽  
Jian Chen ◽  
Guoyang Lu ◽  
Dawei Wang ◽  
Markus Oeser ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Cohesive Zone ◽  
Fracture Behavior ◽  
Cohesive Zone Model ◽  
Mechanical Design ◽  
Design Methods ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Fracture Mechanisms ◽  
Zone Model

To give engineers involved in planning and designing of asphalt pavements a more accurate prediction of crack initiation and propagation, theory-based models need to be developed to connect the loading conditions and fracture mechanisms present in laboratory tests and under traffic loading. The aim of this study is to develop a technical basis for the simulation of fracture behavior of asphalt pavements. The cohesive zone model (CZM) approach was applied in the commercial FE software ABAQUS to analyze crack propagation in asphalt layers. The CZM developed from the asphalt mixtures in this study can be used to simulate the fracture behavior of pavements and further optimize both the structure and the materials. The investigations demonstrated that the remaining service life of asphalt pavements under cyclic load after the initial onset of macro-cracks can be predicted. The developed CZM can, therefore, usefully supplement conventional design methods by improving the accuracy of the predicted stress states and by increasing the quality, efficiency, and safety of mechanical design methods by using this more realistic modeling approach.

Effect of Testing Configuration in Semi-Circular Bending Fracture of Asphalt Mixtures: Experiments and Statistical Analyses

2019 ◽  
Vol 2673 (5) ◽  
pp. 320-328 ◽  
Author(s):  
Gabriel Nsengiyumva ◽  
Yong-Rak Kim
Keyword(s):  
Fracture Behavior ◽  
Peak Load ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Statistical Analyses ◽  
Test Results ◽  
Scb Test ◽  
Transportation Agencies ◽  
Bending Fracture ◽  
Flexibility Index

The semi-circular bending (SCB) test is a simple, efficient, and easily applicable method in the pavement community to characterize fracture behavior. This makes it widely used as a quality control (QC) and quality assurance (QA) approach at several transportation agencies. However, public–private testing laboratories have implemented SCB test methods using different load-support fixture conditions with an insufficient understanding of how the conditions affect the results and testing variability. This could be particularly problematic when using SCB test results obtained from different load-support fixtures as QC–QA (or pass/fail) purposes. This study investigated the effect of SCB testing configurations on test results and their variability by conducting tests using six different load-support fixtures. Several fracture-related indicators such as fracture energy, flexibility index, peak load, and the coefficient of the cracking index resulting from the six different load-support fixtures were compared. Test results and statistical analyses showed that SCB tests generally showed repeatable results, whereas load-support fixtures can affect test results and their repeatability, thus care should be taken when choosing a testing fixture. The addition of roller springs generally increased the variability of the test results. It appears that the mid-span jig was detrimental to testing repeatability, and friction at the support should be avoided because it can erroneously increase fracture resistance with a higher variability.

Evaluation of low temperature viscoelastic properties and fracture behavior of bio-asphalt mixtures

2016 ◽  
Vol 19 (4) ◽  
pp. 362-369 ◽  
Author(s):  
Brian Hill ◽  
Daniel Oldham ◽  
Behzad Behnia ◽  
Elham H. Fini ◽  
William G. Buttlar ◽  
...  
Keyword(s):  
Low Temperature ◽  
Viscoelastic Properties ◽  
Fracture Behavior ◽  
Asphalt Mixtures

scholarly journals Fracture Behavior of Permeable Asphalt Mixtures with Steel Slag under Low Temperature Based on Acoustic Emission Technique

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5090 ◽  
Author(s):  
Bing Zhu ◽  
Hanbing Liu ◽  
Wenjun Li ◽  
Chunli Wu ◽  
Chao Chai
Keyword(s):  
Acoustic Emission ◽  
Low Temperature ◽  
Real Time ◽  
Fracture Behavior ◽  
Steel Slag ◽  
Asphalt Mixtures ◽  
Control Group ◽  
Test Results ◽  
Coarse Aggregates ◽  
Splitting Test

Acoustic emission (AE), as a nondestructive testing (NDT) and real-time monitoring technique, could characterize the damage evolution and fracture behavior of materials. The primary objective of this paper was to investigate the improvement mechanism of steel slag on the low-temperature fracture behavior of permeable asphalt mixtures (PAM). Firstly, steel slag coarse aggregates were used to replace basalt coarse aggregates with equal volume at different levels (0%, 25%, 50%, 75%, and 100%). Then, the low-temperature splitting test with slow loading was used to obtain steady crack growth, and the crack initiation and propagation of specimens were monitored by AE technique in real time. From the low-temperature splitting test results, SS-100 (permeable asphalt mixtures with 100% steel slag) has the optimal low-temperature cracking resistance. Therefore, the difference of fracture behavior between the control group (permeable asphalt mixtures without steel slag) and SS-100 was mainly discussed. From the AE test results, a slight bottom-up trend of sentinel function was founded in the 0.6–0.9 displacement level for SS-100, which is different from the control group. Furthermore, the fracture stages of the control group and SS-100 could be divided based on cumulative RA and cumulative AF curves. The incorporation of 100% steel slag reduced the shear events and restrained the growth of shear cracking of the specimen in the macro-crack stage. Finally, the considerable drops of three kinds of b-values in the final phase were found in the control group, but significant repeated fluctuations in SS-100. In short, the fracture behavior of PAM under low temperature was significantly improved after adding 100% steel slag.

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