Investigation into crack healing of asphalt mixtures using healing agents

Riara, Martin M.; Tang, Ping; Mo, Liantong; Javilla, Barugahare; Wu, Shaopeng

doi:10.1016/j.conbuildmat.2017.11.074

Cited by 26 publications

(5 citation statements)

References 24 publications

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“…SWFs are added to asphalt mixtures during the first manufacturing phase. Nevertheless, when microcracks are generated or these substances are not added at the manufacturing phase, some additional substances such as healing agents are required to seal and fill cracks in order to enhance healing [17,18]. Bitumen healing is reported greatly sensitive to moisture conditioning [19].…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, saturated samples in moisture were observed to recover from damages caused fatigue in an allowed sufficient rest time [25,29]. In another study, moisture penetration had a nominal influence on multiple fracture-rehealing behavior [18]. erefore, it is necessary to adopt a solution to improve the moisture and self-healing behaviors of mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Hosseinian

Gilani

Joobani

et al. 2020

Advances in Civil Engineering

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The construction of suitable roads in rainy areas has created problems in the construction process due to the low resistance of asphalt to moisture. To solve this problem, materials are commonly used that make mixtures resistant to moisture; however, these materials may reduce the dynamic resistance of asphalt. Therefore, materials should be used that, in addition to increasing the dynamic resistance, also increase the moisture resistance of asphalt mixtures. One of these materials used in this research is steel wool fiber (SWF), which in addition to creating conductive roads also could have a significant effect on moisture resistance. In this study, the impact of 2%, 4%, 6%, 8%, and 10% SWF on the Marshall stability and moisture sensitivity of mixtures was investigated using the Marshall stability and indirect tensile strength (ITS) tests, respectively. Moreover, using SWF as a conductive fiber, the conductivity properties of asphalt mixtures were explored to find the optimal amount of electrical conductivity. The results of the Marshall stability test indicated that by increasing SWF contents, the stability of mixtures increased, compared with the base sample, and greater amounts of 6% SWF resulted in the reduction of the Marshall stability. The results of ITS showed that modification of bitumen by SWF increased ITS and tensile strength ratio (TSR) amounts of mixtures. 6% SWF was the optimal amount for enhancing the resistance of asphalt mixtures to moisture sensitivity. The results of the electrical resistivity test showed that the resistivity had three phases: high resistivity, transit, and low resistivity. Mixtures containing less than 4% SWF illustrated an insulating behavior, with electrical resistivity greater than 7.62 × 108 Ω . m . At the transit phase, the resistivity of mixtures had a sharp reduction from 7.62 × 108 Ω . m to 6.17 × 104 Ω . m . Finally, 8% SWF was known as the optimal content for the electrical conductivity of mixtures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Hosseinian

Gilani

Joobani

et al. 2020

Advances in Civil Engineering

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“…The regeneration process called "healing" consists in recovering the material's capacity to carry loads. Many researchers [4,7,10,13,[16][17][18] noted that the initiation of "healing" begins when the material is not loaded. It has been proven that the appropriate rest time and temperature have an effect on MMA regeneration leading to "recovery" of stiffness, increasing the number of cycles carried by the material.…”

Section: The Difference Between Ordinary Fatigue and The Occurrence Omentioning

confidence: 99%

Healing process in Mineral asphalt mixtures

Mączka

2018

TO - PK

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The article presents an issue related to the phenomenon of regeneration occurring in mineral-asphalt mixtures. The introduction of the work discusses the problem of decreasing strength and fatigue life of asphalt mixtures expressed by changing the stiffness modulus. Attention is paid to the complexity of this phenomenon, which is associated with microstructural changes. The review of the state of knowledge discusses a phenomenon called "healing" referring directly to the regeneration of mineral-asphalt mixtures. Later on, based on fatigue tests of the four-point bending beam in the controlled deformation mode, this phenomenon was analyzed. Rest periods between load and heating of samples regenerating the tested mixture are taken into account. Based on the analysis of the test results, it was found that the heating process is a more effective factor leading to a greater regeneration gain not only the stiffness of the sample, but also its lifespan expressed in cycles compared to the rest period. At the end of the work, hysteresis changes were shown to analyze energy changes and the essence of regenerative processes in the context of extending the life of mineral asphalt mixes used in the pavement construction layers.

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“…Short surface cracking in quasi-brittle or elastic-plastic asphalt concrete pavements can post major problems for their service lifetime due to the stress concentration at cracking sites and invasion of micro-dust, which eliminates any chance of crack-healing [1,2]. The fracture toughness KIC of a brittle homogeneous material as defined by Linear Elastic Fracture Mechanics (LEFM) is the key material property for cracking initiation and propagation, and is known to be an important material parameter of asphalt concrete [3,4].…”

Section: Introductionmentioning

confidence: 99%

Low temperature tensile strength and fracture toughness of asphalt concrete determined from small notched 3-P-B samples

Wang¹

2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Cracking in asphalt concrete at low temperatures and relevant brittleness and toughness properties are primary concerns, considering the long-term complex road service conditions and economic impacts due to costly maintenance. In this study, we examine a simple closed-form solution for tensile strength ft and fracture toughness KIC measurements as the key cracking property characteristics of asphalt concrete. Although the limited size or thickness of real asphalt concrete structures invalidates the application of LEFM and fracture toughness KIC criterion, a Boundary Effect Model (BEM) for quasi-brittle fracture of heterogeneous solids considering the combined effects of ft and KIC [11-13] overcomes the problem. Asphalt concrete AC-13 is chosen in this study, small notched three-point-bending (3-p-b) samples are tested at -10°C. The 3-p-b samples have width (or size) W = 35 mm, span S = 88 mm, and thickness B = 30 mm. Two different notch lengths of 7 and 10 mm (or -ratio = a0/W = 0.2 and 0.3) are selected for Group A and B samples to induce different notch and sample boundary interactions. The average aggregate size (or grain size) G of the asphalt concrete is around 5 mm, i.e. the a0/G ratio is only between 1.4 and 2, making the samples highly heterogeneous. BEM analyses of test results show the relative error between the two groups for strength and toughness is less than 13%. If all tests are grouped together, the relative errors of Group A and B in comparison to the strength (ft = 7.23 MPa) and toughness (KIC = 1.81 MPam) of the total sample population are halved to 6%. These preliminary results show that the simple closed-form solution potentially can provide a reliable method for determination of low temperature fracture properties of asphalt concrete for optimization of materials mix for higher cracking resistance.

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Investigation into crack healing of asphalt mixtures using healing agents

Cited by 26 publications

References 24 publications

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Investigation of Moisture Sensitivity and Conductivity Properties of Inductive Asphalt Mixtures Containing Steel Wool Fiber

Healing process in Mineral asphalt mixtures

Low temperature tensile strength and fracture toughness of asphalt concrete determined from small notched 3-P-B samples

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