Fracture Resistance Characterization of Superpave Mixtures Using the Semi-Circular Bending Test

Zhong, Wang; Mohammad, Louay N.; Wang, L B; Mull, M. A.

doi:10.1520/stp37628s

Cited by 20 publications

(13 citation statements)

References 3 publications

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“…In the current research study, the J‐integral concept was incorporated to investigate the fracture properties of asphalt mixtures. The J‐integral is a path independent line integral that characterizes the energy release rate for nonlinear fracture behaviour, and many researchers have studied the fracture behaviour using this concept . Theoretically, the aforementioned energy release rate can be calculated according to the following relationship:

J = true \underset{normalΓ}{true\int} ((), W d x_{2} - t . \frac{\partial u}{\partial x_{1}} d_{S})

in which W ( x 1 , x 2 ) is the strain energy density, x 1 and x 2 are the coordinate directions, u is the displacement vector, t is the surface traction vector and Γ is a contour around the crack tip.…”

Section: Experimental Programmementioning

confidence: 99%

“…Wu et al introduced the critical value of J‐integral ( J c ) as a criterion for measuring the cracking resistance of asphalt mixtures at intermediate temperatures. With at least two different crack lengths, the critical strain energy release rate can be achieved by:

J_{c} = ((), - \frac{1}{b}) \frac{\partial U}{\partial a}

where b is the thickness of specimen, U is the strain energy and a is the crack or notch depth.…”

Section: Experimental Programmementioning

confidence: 99%

See 1 more Smart Citation

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Ameri

Nowbakht

Molayem

et al. 2016

Fatigue Fract Eng Mat Struct

145

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Load‐induced cracking is one of the primary forms of distress in asphalt pavements at intermediate temperatures. Binder modification is a good alternative to promote the cracking resistance of asphalt mixtures. In the current research study, the effects of carbon nanotubes as a binder modifier on the fatigue and fracture performance of asphalt mixtures are investigated. The carbon nanotubes are added at five different percentages ranging from 0.2% to 1.5% to the base binder to study their effects on the fracture resistance and fatigue life of the asphalt mixtures. Using the cracked semi‐circular bend specimen, the critical value of J‐integral (Jc) was obtained for the investigated modified asphalt mixtures. Also, the fatigue behaviour of asphalt mixtures was studied using flexural beam fatigue test specimen. By employing the ratio of dissipated energy change approach, the plateau value of tested mixtures was determined as a measure of fatigue performance. Results showed that the carbon nanotubes can enhance both fracture resistance and fatigue performance of tested asphalt mixtures especially at higher percentages of the carbon nanotube.

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J = true \underset{normalΓ}{true\int} ((), W d x_{2} - t . \frac{\partial u}{\partial x_{1}} d_{S})

Section: Experimental Programmementioning

confidence: 99%

J_{c} = ((), - \frac{1}{b}) \frac{\partial U}{\partial a}

where b is the thickness of specimen, U is the strain energy and a is the crack or notch depth.…”

Section: Experimental Programmementioning

confidence: 99%

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Ameri

Nowbakht

Molayem

et al. 2016

Fatigue Fract Eng Mat Struct

145

View full text Add to dashboard Cite

show abstract

“…Due to the restriction by the limited thickness of the actual asphalt pavement layer, the specimen geometry is one of the critical considerations in selecting of the fracture test. Because of the ease in sample preparation from the gyratory compacted cylinders or field cored samples, the Semi-Circular Bending (SCB) test configuration has been adopted by many researchers in the asphalt pavement community [13,18,19,[24][25][26]. However, very limited material factors and testing conditions were included in these studies.…”

Section: Introductionmentioning

confidence: 99%

Using Semi Circular Bending Test to Evaluate Low Temperature Fracture Resistance for Asphalt Concrete

Marasteanu

2009

Exp Mech

228

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This work presents a repeatable semi circular bending (SCB) fracture test to evaluate the low temperature fracture resistance of asphalt mixture. The fracture resistance of six asphalt mixtures, which represent a combination of factors such as binder type, binder modifier, aggregate type, and air voids, and two testing conditions of loading rate and initial notch length, was evaluated by performing SCB fracture tests at three low temperatures. Fracture energy was calculated from the experimental data. Experimental results indicated strong dependence of the low temperature fracture resistance on the test temperature. Experimental plots and low coefficient of variation (COV) values from three replicates show a satisfactory repeatability from the test. The results of the analysis showed that fracture resistance of asphalt mixtures is significantly affected by type of aggregate and air void content. Experimental results also confirmed the significance of binder grade and modifier type with relation to cracking resistance of asphalt mixtures. Analysis of result also indicated that both the loading rate and initial notch length had significant effect on the fracture energy at the highest test temperature, whereas the effect was strongly diluted at the two lower temperatures. No clear trend was found with the fracture peak load from either the effect of loading rate or notch length.

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“…Nevertheless, tensile resistance is a vital consideration for hot asphalt mixtures design [18]. Cracking of asphalt pavements is widespread due to such reasons such as (i) extreme traffic load, (ii) poor design, and (iii) use of stiff asphalt mixtures in the pavement layers [18][19][20]. The current Superpave volumetric-based mixture design method barely considers the performance of asphalt mixes [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hybrid Modification and Type of Compaction on the Cracking Properties of Asphalt Concrete

Abed

2020

NJES

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This paper focused on evaluating the effect of aggregate gradation and polymer modification on indirect tensile strength (ITS) and the static stiffness for hot asphalt mixtures. In particular, data from ITS tests have been processed to obtain stiffness measurements through the application of Hondros theory. The results showed that fine mixtures had a better tensile strength by 26.3% than the coarse mixtures. The effect of compaction also was examined, the results showed that samples compacted with the Superpave gyratory compactor (SGC) had an enhancement in ITS by 36.58 and 23.1% in comparison with Marshall and roller compactor respectively. Polymer modifiers were used to estimate their effect on tensile strength, adding 4, 6, and 8% of Styrene-Butadiene-Styrene (SBS), which can rise the ITS by 3.2,6.14 and 13.3% of the non-modified asphalt mixture. Furthermore, using 4, 6, and 8 percent of SBS could increase static stiffness by 53.9, 209.6, and 302.4% respectively for roller compacted fine mixes and 58, 220, and 379.3% for SGC compacted mixes. Furthermore, SBS raised the stiffness modulus by 52.3, 188, and 295% for Marshall compacted mixes. Using hybrid modifier can improve the stiffness of the asphalt mixture. However, The results indicate that using 1, 2 and 3% polyvinyl chloride (PVC) can magnify the stiffness of mixtures by 41.2, 199.8% and 262.6 for roller compacted mixtures and 133.4, 212.1 and 354% for SGC compacted mixtures, whereas there is a stringent increasing by 133.4, 189.2 and 354% for Marshall compacted mixes. Otherwise, polymer-modification can decrease the fracturing index for coarse and fine mixtures.

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Fracture Resistance Characterization of Superpave Mixtures Using the Semi-Circular Bending Test

Cited by 20 publications

References 3 publications

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Investigation of fatigue and fracture properties of asphalt mixtures modified with carbon nanotubes

Using Semi Circular Bending Test to Evaluate Low Temperature Fracture Resistance for Asphalt Concrete

Effect of Hybrid Modification and Type of Compaction on the Cracking Properties of Asphalt Concrete

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