Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Xu, Wang; Wei, Xiaoshu; Wei, Jintao; Chen, Zhengxiong

doi:10.3390/ma13081876

Cited by 22 publications

(5 citation statements)

References 32 publications

(32 reference statements)

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“…High interlocking increases the tensile strength and the cracking resistance of the modified asphalt mixtures (Modarres and Hamedi, 2014;Aliha et al, 2015;Movilla-Quesada et al, 2019b). In summary, failure in asphalt mixtures is mainly initiated and propagated around the coarse aggregate of the mixtures (Xu et al, 2020;Radeef et al, 2021b). Thus, the presence of the plastic coat with modified asphalt can lead to a decrease in the rate of cracking propagated throughout.…”

Section: Moisture Damagementioning

confidence: 97%

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

et al. 2021

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In recent years, the proliferation of plastic waste has become a global problem. A potential solution to this problem is the dry process, which incorporates plastic waste into asphalt mixtures. However, the dry process often has inconsistent performance due to poor interaction with binder and improper distribution of plastic waste particles in the mixture skeleton. This inconsistency may be caused by inaccurate mixing method, shredding size, mixing temperature and ingredient priorities. Thus, this study aims to improve the consistency of the dry process by comparing the control asphalt mixture and two plastic waste-modified asphalt mixtures prepared using the dry process. This study used crushed granite aggregate with the nominal maximum aggregate size of 14 mm whereas the shredded plastic bag is in the range of 5–10 mm. Quantitative sieving analysis and performance tests were carried out to examine the effects of plastic waste added into the asphalt mixture. The volumetric and performance properties combined with image analysis of the modified mixtures were obtained and compared with the control mixture. In addition, the moisture damage, resilient modulus, creep deformation and rutting were evaluated. This study also highlighted in detail the distribution of plastic particles in the final skeleton of the asphalt mixture. Based on the analysis, an enhanced dry process of mixing procedure was proposed and evaluated. Results showed that the addition of plastic particles using the conventional dry process leads to the deviation in the aggregate structure as high plastic content is added. Furthermore, the enhanced dry process developed in this study presents substantial enhancement in the asphalt performance, particularly with plastic waste that accounts for 20% of the weight of the asphalt binder.

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Section: Moisture Damagementioning

confidence: 97%

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

et al. 2021

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“…Tis form of damage is yield damage. In this paper, we defne the area of the shaded part of the graph as the impact toughness, which is the work done when the load acts at its maximum [27,28]. According to formulas (4) and ( 5) can be seen, impact toughness can refect the ability of the material to resist fracture damage, combined with Origin software and MATLAB software can calculate the product of the shaded part in Figure 3.…”

Section: Impact Toughness Researchmentioning

confidence: 99%

Ductile–Brittle Transition Temperature of Epoxy Asphalt Concrete of Steel Bridge Deck Pavement Based on Impact Toughness

Zhang

Nie

Sha

et al. 2023

Advances in Materials Science and Engineering

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To solve the common low-temperature cracking problem of epoxy asphalt concrete pavement on the steel bridge deck, based on the principle of fracture mechanics and energy method, this paper puts forward the impact toughness as the evaluation index of crack resistance of epoxy asphalt concrete and verifies the feasibility of this index through theoretical analysis and experiment. At the same time, based on the study of impact toughness, the ductile–brittle transition temperature of epoxy asphalt concrete was explored, and the working state of epoxy asphalt concrete at different temperatures was mastered. The results show that the impact toughness is closely related to the J integral, which can better evaluate the crack resistance of epoxy asphalt mixture. The Boltzmann function can accurately reflect the relationship between impact toughness and temperature and can determine the ductile–brittle transition temperature and transition interval of epoxy asphalt concrete. Impact toughness and ductile–brittle transition temperature can be used as the evaluation index of crack resistance of epoxy asphalt concrete, which provides a new design idea for the study of crack resistance of epoxy asphalt concrete and the scope of engineering application.

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“…Fracture toughness (K IC ) is one of the variables for analysing failure mechanisms; it is the material's resistance to crack propagation [18,20,21]. Various experimental procedures existed to estimate the K IC of asphalt mixtures as follows:…”

Section: Introductionmentioning

confidence: 99%

The Characterisation of Fracture Resistance of Asphalt Mixtures Containing Rubber Modifiers and a Wax-Based Additive

Poovaneshvaran

Hasan

Jamshidi

et al. 2023

Advances in Materials Science and Engineering

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Asphalt mixture modification with rubberised material frequently results in improved characteristics and extended service life in actual application. This research characterised the synergistic consequences of rubber modifiers (crumb rubber powder (CRP) and natural rubber latex (NRL)) and wax-based admixtures (Tough Fix Hyper (TFH)) on the performance of the asphalt mixture from the fracture energy and laboratory fracture resistance perspectives. Semicircular bending (SCB) and indirect tensile strength (ITS) tests were conducted to assess the fracture properties of the asphalt mixture samples. To prepare asphalt mixture samples, the wet method was utilised. Higher CRP levels resulted in greater strength and a longer time to attain peak force for both control and mixtures containing wax admixture, as determined by SCB. The interaction between the higher CRP or NRL content and the TFH additive enhanced the fracture resistance, indicating that the components are highly compatible. The 10L + TFH additive produced the highest fraction of energy, indicating a more significant improvement than the counterpart mixes containing the CRP modifier. In addition, incorporation of the CRP and NRL increased the fracture plastic zone (FPZ), resulting in increased fracture toughness. Therefore, the gradient of fracture toughness and fracture energy in the asphalt mix depends on the rubber type, content, and TFH. Although the higher CRP, NRL, and TFH improve the fracture energy and cracking resistance, they increase the crack initiation and propagation velocities, whereby the high bitumen stiffness makes the mixture more brittle than the control mixture. Caution should be exercised when selecting the content of rubber modifier and TFH for the asphalt pavements in low-temperature service. Also, there is a direct interconnection between fracture resistance and fracture energy in the mixtures containing CRP, NRL, and TFH. Such correlations can be used as the premise of predictive micro- and macro-models to evaluate mixture performance in terms of fracture resistance.

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Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Cited by 22 publications

References 32 publications

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

Enhanced Dry Process Method for Modified Asphalt Containing Plastic Waste

Ductile–Brittle Transition Temperature of Epoxy Asphalt Concrete of Steel Bridge Deck Pavement Based on Impact Toughness

The Characterisation of Fracture Resistance of Asphalt Mixtures Containing Rubber Modifiers and a Wax-Based Additive

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