Development of the fracture-based flexibility index for asphalt concrete cracking potential using modified semi-circle bending test parameters

Özer, Hasan; Al‐Qadi, Imad L.; Lambros, John; El-Khatib, Ahmad; Singhvi, Punit; Doll, Berangere

doi:10.1016/j.conbuildmat.2016.03.144

Cited by 216 publications

(68 citation statements)

References 19 publications

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“…Simple three-point bending mechanism using crosshead movements is the main concept in the SCB test method. The experimental procedure used for determining intermediate-temperature cracking resistance of AC mixtures was developed by Wu et al [31,43]. They used a same SCB specimen geometry with different testing parameters (i.e.…”

Section: Introductionmentioning

confidence: 99%

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

Aliha

Fakhri

Kharrazi

et al. 2017

Frattura Ed Integrità Strutturale

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At intermediate service temperatures hot mix asphalt (HMA) concretely are subjected to different loading rates due to movement of vehicles which can significantly affect their mechanical characteristics and final service load. Hence, in this paper the effect of loading rate on intermediate temperature fracture resistance of HMA materials is investigated experimentally in different modes of cracking. Different hot mix asphalt mixtures made of various compositions were subjected to asymmetric threepoint bend loading in the form of edge cracked semi-circular bend (SCB) specimens. The effect of aggregate type and air void were studied on the fracture energy values for three mode mixities (including pure mode I, mixed mode I/II and pure mode II) and at different temperatures of 5°C, 15°C and 25°C. Trends of change in fracture energy values revealed noticeable influence of loading rate on the low and intermediate temperature cracking behavior of tested asphalt mixtures with different air void contents and aggregate types subjected to mixed mode I/II loading. Also, a change observed in fracture resistance of asphalt mixtures at nearly zero (5°C) and intermediate temperatures (25°C) that was due to change in the behavior of bitumen from elastic to viscoelastic.

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Section: Introductionmentioning

confidence: 99%

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

Aliha

Fakhri

Kharrazi

et al. 2017

Frattura Ed Integrità Strutturale

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“…Therefore, the resulting brittleness can prolong the crack initiation but can accelerate the crack propagation afterward. In order to investigate whether the modified asphalt mixtures examined in this study possess both strength and ductility, a fracture based Flexibility Index (FI) proposed by Ozer et al [36] was also calculated for the modified and control asphalt mixtures. In this measure, the combination of post-peak slope of load-displacement curve and the fracture energy is used for characterizing the cracking potential of asphalt mixtures in addition to the fracture toughness.…”

Section: Analysis Of Results and Discussionmentioning

confidence: 99%

The impacts of type and proportion of five different asphalt modifiers on the low temperature fracture toughness and fracture energy of modified HMA

Tafti

Aqda

Motamedi

2018

Frattura Ed Integrità Strutturale

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Low-temperature fracture toughness and fracture energy are two important measures that could be used to investigate the impacts of using asphalt modifiers on the performance of asphalt pavements in cold regions. The aim of this research was to identify the impacts of using various proportions of five different asphalt modifiers on the fracture toughness and the fracture energy of Hot Mix Asphalts (HMA) under mode I loading and at low environmental temperatures. The asphalt modifiers used for this purpose were: Elastoplastomer Polymer Strings (EPS), Parafiber, Sulfur Polymer, Polyolefin-Aramid Compound Structural Fibers (PACSF) and Sasobit. These modifiers were individually used at three different proportions to produce Semi-circular Bend Specimens containing vertical edge crack. Each specimen was then tested under symmetric monotonic three-point bend loading at-15°C. The results indicated that, except for the EPS, both fracture toughness and fracture energy were increased with an increase in the modifier proportion. The highest increase in both measures was observed in the specimens modified with the PACSF, closely followed by specimens modified with the Parafibers. The least increase in these two measures was observed in the specimens modified with the Sulfur Polymer. The results indicated the applicability of examined modifiers to improve the resistance of HMA to crack initiation and crack growth at low temperatures.

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“…On the other hand, Ozer et al (2016) concluded that "the range of FI values for the laboratory produced mixes was in the range from 2 to 16 with an increasing brittleness with lower FI values". As mentioned by Ozer et al (2016), FI may be considered as a parameter of process zone size or other combinations with a good correlation to crack growth speed. Figure 8 shows P-LLD curves of cracked specimens for all RAP groups.…”

Section: Smooth Specimensmentioning

confidence: 99%

“…The comparison between the values of FI measured from the smooth specimens and those from cracked specimens revealed that there is no clear trend for FI, some values increased, others decreased, and the rest kept constant, see Table 6. Furthermore, Ozer et al (2016) suggested three different relations to calculate FI, one of them as suggested by AASHTO TP 124-16 (2016). Therefore, the concept of FI should be reviewed and needs extra work to be verified.…”

Section: Smooth Specimensmentioning

confidence: 99%

Effect of RAP content on flexural behavior and fracture toughness of flexible pavement

Mubaraki

Osman

Sallam

2019

Lat. Am. j. solids struct.

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The use of recycled Reclaimed Asphalt Pavement (RAP) material into flexible pavement contributes to sustainable development with environmental and economic benefits. In the present work, Semi-Circular Bending (SCB) specimen has been adopted to study the flexural strength and mode-I fracture toughness of flexible pavement with and without RAP. Two different resources of RAP, namely KS and KF, with two different percentages (20% and 40%) have been examined. Smooth and cracked specimens have been cast to measure the flexural strength and mode-I fracture of flexible pavement containing RAP, respectively. Smooth and cracked specimens for flexible pavement without RAP, as control beams, have been cast for the sake of comparisons. The experimental results showed that, the flexural strength and mode-I fracture toughness of flexible pavement containing 40% RAP are higher than those of flexible pavement without RAP, for the two types of RAP. Comparison between the of work of fracture calculated based on AASHTO TP 105-13 and AASHTO TP 124-16 showed that, the calculation based on AASHTO TP 105-13 is more accurate than that based on AASHTO TP 124-16. Furthermore, the suggested quad-linear relation to work of fracture predictions is easier and more reasonable for presenting the experimental results especially for the descending part of P-LLD curve than that suggested as exponential curve by AASHTO TP 124-16. For all groups, the type of failure is intergranular-mode fracture.

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Development of the fracture-based flexibility index for asphalt concrete cracking potential using modified semi-circle bending test parameters

Cited by 216 publications

References 19 publications

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

The impacts of type and proportion of five different asphalt modifiers on the low temperature fracture toughness and fracture energy of modified HMA

Effect of RAP content on flexural behavior and fracture toughness of flexible pavement

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