Determination of master curves for asphalt mixtures by means of IT-CY tests^1

Tóth, Csaba; Ureczky, Judit

doi:10.3311/pp.ci.2010-2.09

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…These studies have identified many interrelated factors such as; source of bitumen, bitumen type, absorption, production temperature and silo storage time etc. [11,12] The results of their studies have depicted that, laboratory aging procedures brought in similar properties to the bitumen with the field aging [6,[13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Different Laboratory Aging Methods of Bituminous Mixtures

Durmaz

Şengöz

Özdemir

et al. 2021

Period. Polytech. Civil Eng.

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The predicted performance and service life of the pavement depend largely on the properties of bitumen used in the mixtures. The most important feature of bitumen, which has profound effect on the performance of the road is durability. The durability of bitumen is expressed as the resistance to aging. In this study, the bituminous mixture aging was performed instead of bitumen aging in order to represent the aging in the field in the best possible way. The aim of this paper is to evaluate different proposed laboratory aging methods (NCHRP 09-52, NCHRP 09-54 and RILEM) in relation with the current Standard AASHTO R30 (Standard Practice For Mixture Conditioning of Hot Mix Asphalt standard) and to make comparison with the samples performance taken from the field in terms of Indirect Tensile Strength (ITS). The level of aging has also been compared with the samples taken from recently constructed pavement surface and from the five years old pavement surface. Results depicted that, laboratory aging methods revealed the field aging properties on the unaged bitumen. Based on the results, 2 hours forced draft oven aging at 135°C is recommended as short term aging condition because, 2 hours or 4 hours short term forced draft oven aging did not yield significant variation in terms of ITS values. Additionally, 120 hours (5 days) oven aging of compacted samples at 85°C can be recommended as long term aging condition.

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Section: Introductionmentioning

confidence: 99%

Investigation of Different Laboratory Aging Methods of Bituminous Mixtures

Durmaz

Şengöz

Özdemir

et al. 2021

Period. Polytech. Civil Eng.

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“…The mechanical behavior of bituminous composites is viscoelastic. i.e., its mechanical properties depend on temperature and the load amplitude (frequency) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation to Quantify the Rate of Damage within Mortar Bituminous Materials: Modeling of Cracks Initiation and Propagation

Haloui

Bougrine

Omari

et al. 2019

Period. Polytech. Civil Eng.

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Asphalt concrete is highly used to construct pavement layers in the civil engineering field. It is defined as a complex medium composed of aggregates (inclusions), mortar (matrix) and air void. The mortar itself is a mixture of fillers, sand and bitumen. Furthermore, mortar is the phase that links the coarse aggregates. In general, fracture of asphalt concrete occurs within mortar or among aggregate-mortar interface. Therefore, two types of fracture can be identified, i.e., adhesive and cohesive damages. The first type is occurred among the interface of aggregate-mortar. The second is taken place within the mortar. This paper presents numerical investigations of the damage initiation and stiffness degradation within the asphalt concrete matrix. Numerical simulations were carried out to investigate, firstly, how damage is initiated and developed, and then, to simulate how cracks can be initiated and propagated within this material. Cohesive finite elements method was adopted to simulate fracture. For adhesive damage, the model was represented by one rectangular aggregate that is linked to the asphalt concrete thanks to a thin layer of the mortar. For cohesive damage, the model was considered as a thick layer of the mortar in between two coarse aggregates. The applied loading was derived from the speed of traffic vehicle. A comparative analysis between four mortars was conducted. The effect of loading and the type of mortar on damage initiation and stiffness degradation will be shown. Moreover, the initiation and propagation of cracks as function of loading and stiffness modulus will be illustrated.

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“…1 compares dynamic modulus of DGAC and GGARC imported to MEPDG as input level 1. The dynamic modulus master curves for DGAC and GGARC at each test temperature and frequency are obtained using unconfined and confined compression tests [14,15]; although, the results of other tests such as indirect tension test on cylindrical specimen (IT-CY) can be used to develop master curve [26]. In the case that dense graded asphalt concrete is used as overlay layer, its characteristics are considered the same as the properties of the existing asphalt concrete layer as shown in Table 2.…”

Section: Pavement Layers Characteristicsmentioning

confidence: 99%