Comparison of low-temperature fracture and strength properties of asphalt mixture obtained from IDT and SCB under different testing configurations

Falchetto, Augusto Cannone; Moon, Ki Hoon; Wang, Di; Riccardi, Chiara; Wistuba, Michael P.

doi:10.1080/14680629.2018.1418722

Cited by 76 publications

(13 citation statements)

References 15 publications

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“…The theories of maximum tensile stress and strain are implemented as the failure criterion of asphalt pavement [24,25]. The laboratory strength test methods mainly include direct tension [26,27,28,29], unconfined compression [30,31,32], bending [33,34,35], indirect tension [36,37,38,39], shear [40,41], and triaxial tests [42,43], which are performed to evaluate the tensile, compressive, bending, and shear properties of materials. For the unconfined compression test, the applied strain rate in height direction of specimens is 1.3 mm/(min .…”

Section: Introductionmentioning

confidence: 99%

Unified Strength Model of Asphalt Mixture under Various Loading Modes

et al. 2019

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Although the rutting resistance, fatigue cracking, and the resistance to water and frost are important for the asphalt pavement, the strength of asphalt mixture is also an important factor for the asphalt mixture design. The strength of asphalt mixture is directly associated with the overall performance of asphalt mixture. As a top layer material of asphalt pavement, the strength of asphalt mixture plays an indispensable role in the top structural bearing layer. In the present design system, the strength of asphalt pavement is usually achieved via the laboratory tests. The stress states are usually different for the different laboratory approaches. Even at the same stress level, the laboratory strengths of asphalt mixture obtained are significantly different, which leads to misunderstanding of the asphalt mixtures used in asphalt pavement structure design. The arbitrariness of strength determinations affects the effectiveness of the asphalt pavement structure design in civil engineering. Therefore, in order to overcome the design deviation caused by the randomness of the laboratory strength of asphalt mixtures, in this study, the direct tension, indirect tension, and unconfined compression tests were implemented on the specimens under different loading rates. The strength model of asphalt mixture under different loading modes was established. The relationship between the strength ratio and loading rate of direct tension, indirect tension, and unconfined compression tests was adopted separately. Then, one unified strength model of asphalt mixture with different loading modes was established. The preliminary results show that the proposed unified strength model could be applied to improve the accurate degree of laboratory strength. The effectiveness of laboratory-based asphalt pavement structure design can therefore be promoted.

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Section: Introductionmentioning

confidence: 99%

Unified Strength Model of Asphalt Mixture under Various Loading Modes

et al. 2019

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“…A notch with a width of 2.5 mm and a depth of 15 mm was cut in the middle of each SCB specimen. The cutting method was recommended in the technical specification for cold recycling construction of emulsified asphalt on Highway Asphalt Pavement (DB13/T-2020) [ 11 , 32 , 33 ].…”

Section: Raw Materials and Experimental Designmentioning

confidence: 99%

Study on Low-Temperature Index and Improvement Measures of Emulsified Asphalt Cold Recycled Mixture

Han

et al. 2022

Materials

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With the promotion of cold recycled mixture (CRM) in cold areas and the improvement of its application layer, the enhancement of the low-temperature performance of mixtures is particularly important. The applicability of the current low-temperature bending test method to CRM is controversial. Firstly, the low-temperature crack resistance of CRM with different gradations and emulsified asphalt contents was studied by the indirect tensile (IDT) test and the semi-circular bending (SCB) test. Thereafter, the low-temperature performance evaluation index suitable for CRM was put forward. Then, the low-temperature performance of CRM with different gradations, fiber types, and contents was evaluated by using the above low-temperature evaluation index. The results show that the low-temperature performance of CRM with different gradations and emulsified asphalt contents can be distinguished by fracture work (W) and fracture energy (Gf). Not only do the test results have little variability (about 12% and 15%, respectively), but also the correlation coefficient with the new asphalt film thickness is the highest (0.8595 and 0.8939, respectively). Compared with coarse gradation (AC-25) and fine gradation (AC-13), medium-gradation (AC-20) CRM has higher low-temperature performance, and polyester fiber can significantly improve the low-temperature performance of CRM. Compared with non-fiber, the W and Gf of CRM of polyester fiber (0.3% content) can be increased by at least 42% and 30%, respectively.

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“…These fracture parameters for pavement structure are functions of the elastic modulus and Poisson's ratio of the asphalt components, the crack length, the thickness of the HMA layer, and so on 7 . In recent years, several researchers have used different laboratory tests including the semicircular bending (SCB) test, 20–28 the dissipated creep strain energy (DCSE) test, 29 the disc‐shaped compact tension (DCT) test, 30,31 the edge notch disc bend (ENDB) test, 32–39 and so on 40,41 for investigating and analyzing the fracture behavior of asphalt mixtures. However, many of these laboratory tests cannot simulate exactly the cracking mechanism of real asphalt mixture in the field 23,36,42–53 .…”

Section: Introductionmentioning

confidence: 99%

Mixed mode I+II fracture parameters and cracking trajectory of heterogeneous multilayer pavement structure containing reflective crack

Ziari

Aliha

Fard

et al. 2022

Fatigue Fract Eng Mat Struct

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Using aggregate generation and packing algorithm technique coupled with finite element method, a part of reconstructed asphalt pavement structure with five layers and containing a bottom-up crack was simulated. For more realistic modeling and more accurate analyzing the cracking behavior of pavement, a region surrounding the initial crack (and bottom-up crack) region and its neighborhood was modeled as a heterogeneous two-phase (aggregate/mastic) mixture. The results of numerical analyses showed that a significant difference exists between the crack tip fracture parameters (i.e., K I , K II , K eff , T-stress, and Biaxiality ratio) of the homogenous and heterogeneous models. The heterogeneous simulation (in this case study) leads to approximately 70% reduction in the effective stress intensity factor. Furthermore, it was shown that the fracture trajectory of a simulative reflective cracking (SRC) test conducted on a real bilayer asphalt beam sample can be predicted well by modeling the beam layers as a heterogeneous two-phase mixture. K E Y W O R D Saggregate generation and packing algorithms, bottom-up crack, finite element method, fracture parameters, reflective cracking trajectory, two-phase heterogeneous asphalt modeling

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Comparison of low-temperature fracture and strength properties of asphalt mixture obtained from IDT and SCB under different testing configurations

Cited by 76 publications

References 15 publications

Unified Strength Model of Asphalt Mixture under Various Loading Modes

Unified Strength Model of Asphalt Mixture under Various Loading Modes

Study on Low-Temperature Index and Improvement Measures of Emulsified Asphalt Cold Recycled Mixture

Mixed mode I+II fracture parameters and cracking trajectory of heterogeneous multilayer pavement structure containing reflective crack

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