Modelling the quasi-static behaviour of bituminous material using a cohesive zone model

Tabaković, Amir; Karač, Aleksandar; Ivanković, Alojz; Gibney, Amanda; McNally, Ciarán; Gilchrist, Michael D.

doi:10.1016/j.engfracmech.2010.06.023

Cited by 23 publications

(12 citation statements)

References 39 publications

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“…The corresponding compression for the mastic mix is about 1.8 MPa, and the vehicle loading pressure is less than 1 MPa [22,23]. After curing at 160 • C, capsules with A/R ratios of 20/80 and 10/90 show a compressive strength less than 0.4 MPa, which is insufficient to survive the asphalt production process.…”

Section: Compressive Tests On Capsulesmentioning

confidence: 99%

Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt

Tabaković

Liu

et al. 2019

Applied Sciences

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It has been demonstrated that calcium alginate capsules can be used as an asphalt healing system by pre-placing rejuvenator (healing agent) into the asphalt mix and releasing the rejuvenator on demand (upon cracking). This healing mechanism relies on the properties of capsules which are determined by the capsule preparation process. In this study, to optimize the calcium alginate capsules, capsules are prepared using varying Alginate/Rejuvenator (A/R) ratios. Light microscope microscopy and Environmental Scanning Electron Microscope (ESEM) are employed to characterize the morphology and microstructure of these capsules. Thermal stability and mechanical property are investigated by thermogravimetric analysis (TGA) and compressive tests. The testing results indicate that higher alginate content results in smaller diameter and lower thermal resistance, but higher compressive strength. The optimum A/R ratio of calcium alginate capsules is found to be 30/70. To prove the effectiveness of the optimized capsules, the capsules are embedded in asphalt mortar beams and a bending and healing program is carried out. The effect of capsule shell material on the mechanical response of asphalt mixture is evaluated through three-point bending on the mortar beams embedded with blank capsules (without the healing agent). Aged mortar beams containing alginate capsules encapsulating rejuvenator demonstrate a higher strength recovery after bending tests, which indicates effective healing due to the release of the rejuvenators from the capsules.

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Section: Compressive Tests On Capsulesmentioning

confidence: 99%

Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt

Tabaković

Liu

et al. 2019

Applied Sciences

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“…surfaces). This test configuration offers several advantages with respect to other testing setups in order to test multiple release and healing with the same fibre [25,30]. The 3PB test geometry allows localization of the damage (development of micro cracks) along the underside specimen face.…”

Section: Three-point Bend (3pb) Testmentioning

confidence: 99%

“…It allows for the initiation and growth of micro cracks along the surface, demonstrating that the healing system is capable of multi crack healing and also testing the fibre healing function for subsequent (multiple) healing events. The test also allows for large cracks to form rapidly which causes full test specimen failure, this can be achieved by increasing the loading rate or reducing the test temperature [30].…”

Section: Three-point Bend (3pb) Testmentioning

confidence: 99%

The reinforcement and healing of asphalt mastic mixtures by rejuvenator encapsulation in alginate compartmented fibres

Tabaković

Post

Cantero

et al. 2016

Smart Mater. Struct.

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This paper explores the potential use of compartmented alginate fibres as a new method of incorporating rejuvenators into asphalt pavement mixtures. The compartmented fibres are employed to locally distribute the rejuvenator and to overcome the problems associated with spherical capsules and hollow fibres. The work presents proof of concept of the encapsulation process which involved embedding the fibres into the asphalt mastic mixture and the survival rate of fibres in the asphalt mixture. To prove the effectiveness of the alginate as a rejuvenator encapsulating material and to demonstrate its ability survive asphalt production process, the fibres containing the rejuvenator were prepared and subjected to Thermogravimetric Analysis (TGA) and Uniaxial Tensile Test (UTT). The test results demonstrated that fibres have suitable thermal and mechanical strength to survive the asphalt mixing and compaction process. The CT scan of an asphalt mortar mix containing fibres demonstrated that fibres are present in the mix in their full length, undamaged, providing confirmation that the fibres survived the asphalt production process. In order to investigate the fibres physiological properties and ability to release the rejuvenator into cracks in the asphalt mastic, the Environmental Scanning Electron Microscope (ESEM) and optical microscope analysis were employed. To prove its success as an asphalt healing system, compartmented alginate fibres containing rejuvenator were embedded in asphalt mastic mix. The three point bend (3PB) tests were performed on the asphalt mastic test samples and the degree to which the samples began to self-heal in response was measured and quantified. The research findings indicate that alginate fibres present a promising new approach for the development of self-healing asphalt pavement systems.

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“…[39]), or combined with finite-volume methods (e.g. [40,41]), the CZM has become one of the most popular approaches to simulate fracture. In particular, cohesive (also called 'interface') elements have been applied to a very wide range of problems involving damage initiation and/or propagation.…”

Section: Theoretical Background: the Cohesive Zone Model (Czm)mentioning

confidence: 99%

Mode I fracture in adhesively-bonded joints: A mesh-size independent modelling approach using cohesive elements

Álvarez

Blackman

Guild

et al. 2014

Engineering Fracture Mechanics

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Modelling the quasi-static behaviour of bituminous material using a cohesive zone model

Abstract: Item record/more information http://hdl.handle.net/10197/3190 Publisher's statement þÿ T h i s i s t h e a u t h o r s v e r s i o n o f a w o r k t h a t

Cited by 23 publications

References 39 publications

Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt

Optimization of the Calcium Alginate Capsules for Self-Healing Asphalt

The reinforcement and healing of asphalt mastic mixtures by rejuvenator encapsulation in alginate compartmented fibres

Mode I fracture in adhesively-bonded joints: A mesh-size independent modelling approach using cohesive elements

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