Influence of specimen geometry on mode I fracture toughness of asphalt concrete

Fuan, Si; Ma, Keping; Kang-he, Liu; Li, Kun; Aliha, M.R.M.

doi:10.1016/j.conbuildmat.2020.122181

Cited by 55 publications

(22 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value of mode I fracture toughness increases from 0.66 MPam 0.5 (obtained from the BD specimen) to 0.82 MPam 0.5 (obtained from the SCB specimen). According to recent works published by Aliha and co-workers [25,26,48], the mode I fracture toughness of asphalt mixtures depends on the geometry and loading conditions of the employed test specimen. Based on their finding (that is confirmed in this research as well), the mode I fracture toughness value obtained from the diametral compression test is lower than the value obtained by bending type specimen.…”

Section: Fracture Resistance Values Of Tested Samplesmentioning

confidence: 99%

Contribution of Interface Fracture Mechanism on Fracture Propagation Trajectory of Heterogeneous Asphalt Composites

Liang

Yang

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

Asphalt mixture is a type of textured composite material made of aggregates and mastic part. Overall strength and failure behavior in such materials depends on the texture or heterogeneity of the mixture. In particular, the crack growth mechanism from the tip of the pre-crack is significantly affected by the texture of the asphalt composite and environmental conditions. The crack can extend through the soft mastic, tight aggregates or interface of the mastic/aggregates. In this research, by performing some fracture tests on a typical asphalt mixture with different test specimens under mode I, mixed mode I/II and mixed mode I/III, the fracture resistance and trajectory of propagating crack is studied at two low and medium temperatures (i.e., −15 and +15 °C). The load bearing capacity and the fracture resistance of the tested asphalt samples increases by decreasing the temperature. It is also shown that a significant part of fracture plane passes through the soft mastic and boundary of aggregates (i.e., the interface of aggregates and mastic) and only about 10–15% of the fracture surface of the propagating crack passes via the tight aggregates by breaking them. This percentage decreases for mode II and III loading conditions and higher testing temperatures. Compared to brittle and isotropic materials, the fracture path of the asphalt mixture shows more deviation, and this deviation increases for those mixtures containing coarser aggregates in the ligament and tested under medium temperature conditions.

show abstract

Section: Fracture Resistance Values Of Tested Samplesmentioning

confidence: 99%

Contribution of Interface Fracture Mechanism on Fracture Propagation Trajectory of Heterogeneous Asphalt Composites

Liang

Yang

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…where P is the applied load and Y I is the mode I geometry factor that is a function of the specimen geometry (i.e., a/R or a/t) and loading conditions (i.e., S/R or S/L) of the ENDB, SCB, SENB and ENDC specimens [31,32,[58][59][60][61][62]. The corresponding values of these geometry factors can be determined using finite element analysis.…”

Section: Fracture Toughness Test Specimensmentioning

confidence: 99%

Comparison of Testing Method Effects on Cracking Resistance of Asphalt Concrete Mixtures

2021

View full text Add to dashboard Cite

As an inherent characteristic of materials, the fracture toughness is an important parameter to study the cracking behavior of asphalt concrete mixtures. Although material compositions and environmental conditions have a significant effect on the fracture toughness, for a certain material and testing environment, the test condition including the specimen configuration and loading type may also affect the obtained fracture toughness. In this paper, the effect of specimen configuration and applied loading type on the measured pure mode-I fracture toughness (KIc) is investigated. In order to achieve this purpose, using a typical asphalt mixture, four different test specimens including Semi-Circular Bend (SCB), Edge Notch Disc Bend (ENDB), Single Edge Notch Beam (SENB) and Edge Notch Diametral Compression (ENDC) disc are tested under pure mode I. The mentioned specimens have different shapes (i.e., full disc, semi-disc and rectangular beam) and are loaded either with symmetric three-point bending or diametral compressive force. The tests were performed at two low temperatures (−5 °C and −25 °C) and it was observed that the critical mode-I fracture toughness (KIc) was changed slightly (up to 10%) by changing the shape of the test specimen (i.e., disc and beam). This reveals that the fracture toughness is not significantly dependent on the shape of the test specimen. However, the type of applied loading has a significant influence on the determined mode I fracture toughness such that the fracture toughness determined by the disc shape specimen loaded by diametral compression (i.e., ENDC) is about 25% less than the KIc value with the same geometry but loaded with the three-point bending (i.e., ENDB) specimen. In addition, the fracture toughness values of all tested samples were increased linearly by decreasing the test temperature such that the fracture toughness ratio (KIc (@-25 °C)/KIc (@-5 °C)) was nearly constant for the ENDB, ENDC, SCB and SENB samples.

show abstract

“…Nowadays, several specimens with disc‐shaped geometries (with various loading setups) are used to investigate the fracture behavior of geomaterials subjected to pure mode I and pure mode II 28–30 . Some of these specimens are Brazilian disc (BD) specimen, 31–33 flattened BD specimen, 34 center cracked ring‐shaped specimen, 35,36 which are loaded using diametral compression, and the edge‐cracked semicircular bend disc (SCB), 22,37–40 edge‐cracked cylindrical specimen, 41 and edge‐notched disc bend (ENDB), 42–45 which are tested under three‐point bending load. However, specific difficulties can be seen in practice based on the utilized test specimens (e.g., preparation of center or chevron notches in the BD specimens).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, researches showed that the fracture toughness of a material varies with the change of geometry and loading type of the test specimen (i.e., tension, compression, bending, and torsion) 23,24,43,46 . In this context, choosing a suite test specimen for conducting the fracture toughness measurements requires proper attention to the available equipment.…”

Section: Introductionmentioning

confidence: 99%

“…This procedure is a reliable method to measure the fracture toughness for a material with different shapes and loading types. The SCB specimen is a well‐known fracture toughness test specimen mentioned in different standards and used by several researchers, 43,47–52 and the ENDB is a recently introduced specimen by Aliha et al, 53–55 which is increasingly used for fracture behavior studies of concrete materials 19,42,56–58 . Using the mentioned specimens, pure mode I and pure mode II fracture toughness is measured experimentally.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Hajiloo

Karimi

Aliha

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The effect of some important testing conditions including test specimen (SCB and ENDB), fracture mode (I and II), loading rate (0.5, 1.0, and 5.0 mm/min), and temperature (−5°C, −15°C, and −25°C) is evaluated on fracture toughness of asphalt material containing different percentages of fibers (0%, 0.025%, 0.05%, and 0.1% of unit weight). The experimental and numerical results show that the addition of 0.025%, 0.05%, and 0.1% of the polyolefin–aramid fiber in asphalt mixture increases the fracture toughness of the control mixture by about 8%, 17%, and 23% in pure mode I and 7%, 16%, and 24% in pure mode II, respectively; which are among the most promising enhancements compared to other fibers. Results also reveal that fracture toughness at mode I obtained from the SCB and ENDB specimens is similar. However, the mode II fracture toughness obtained from the ENDB specimen is about 12% higher than the corresponding value obtained from the SCB specimen.

show abstract

Influence of specimen geometry on mode I fracture toughness of asphalt concrete

Cited by 55 publications

References 61 publications

Contribution of Interface Fracture Mechanism on Fracture Propagation Trajectory of Heterogeneous Asphalt Composites

Contribution of Interface Fracture Mechanism on Fracture Propagation Trajectory of Heterogeneous Asphalt Composites

Comparison of Testing Method Effects on Cracking Resistance of Asphalt Concrete Mixtures

Crack resistance of fiber‐reinforced asphalt mixtures: Effect of test specimen and test condition

Contact Info

Product

Resources

About