Impact of Loading Rate and Temperature on Tensile Strength of Asphalt Mixtures at Low Temperatures

Steiner, Daniel; Hofko, Bernhard; Dimitrov, M; Blab, Ronald

doi:10.1007/978-94-024-0867-6_10

Cited by 12 publications

(5 citation statements)

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“…One of the methods that describe direct tensile strength of asphalt mixtures at low temperatures is the uniaxial tension stress test (UTST) [16,17]. Tensile strength reserve is defined as the difference between stress curves derived from both the TSRST and the UTST.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Pszczoła

Szydłowski

2018

Materials

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In regions with low-temperatures, action transverse cracks can appear in asphalt pavements as a result of thermal stresses that exceed the fracture strength of materials used in asphalt layers. To better understand thermal cracking phenomenon, strength properties of different asphalt mixtures were investigated. Four test methods were used to assess the influence of bitumen type and mixture composition on tensile strength properties of asphalt mixtures: tensile strength was measured using the thermal stress restrained specimen test (TSRST) and the uniaxial tension stress test (UTST), flexural strength was measured using the bending beam test (BBT), and fracture toughness was measured using the semi-circular bending test (SCB). The strength reserve behavior of tested asphalt mixtures was assessed as well. The influence of cooling rate on the strength reserve was investigated and correlations between results from different test methods were also analyzed and discussed. It was observed that the type of bitumen was a factor of crucial importance to low-temperature properties of the tested asphalt concretes. This conclusion was valid for all test methods that were used. It was also observed that the level of cooling rate influenced the strength reserve and, in consequence, resistance to low-temperature cracking. It was concluded that reasonably good correlations were observed between strength results for the UTST, BBT, and SCB test methods.

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Section: Introductionmentioning

confidence: 99%

Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Pszczoła

Szydłowski

2018

Materials

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“…Normally, a faster loading rate or lower temperature will lead to a higher strength value ( 24 – 26 ). The relationship was built between the strength and strain rate at the temperature of 10°C for an asphalt mixture with a maximum nominal aggregate size of 22 mm and a polymer modified binder ( 27 ), as shown in the following Equation 10:…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Study on Thermal Reflective Cracking of Asphalt Concrete Overlays on Concrete Pavements Under Moderate Temperature Variations Using Finite Element Model

Jiao

Harvey

et al. 2023

Transportation Research Record: Journal of the Transportation R

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This study investigated the effects of moderate daily temperature variations on reflective cracking in asphalt concrete (AC) overlays on Portland cement concrete (PCC) pavements using three-dimensional (3D) finite element (FE) modeling. The FE model consists of an AC overlay on top of PCC slabs, followed by aggregate base and subgrade. The year-round temperature variations were divided into discrete groups using a clustering technique and each group was applied separately in the FE model. The maximum stress and strain values associated with each temperature variation group were determined using the FE model and used as the driving force corresponding to the thermally induced damage in the AC overlay. The results show that the maximum stress and strain values in the overlay depend on the hourly temperature variation as well as the seasonal temperature profile. The daily temperature variation controls the deformation of the underlying PCC slabs, whereas the seasonal temperature profile determines the viscoelastic properties of the AC overlay. The estimated maximum tensile stress and strain values suggest that the AC overlay is primarily subjected to damage from repetitive thermal loading instead of one-time fracture events for moderate temperature variations. In addition, when the AC overlay is fully bonded to the PCC slabs, the thermal strains are much greater than the traffic induced strains, indicating a high possibility of thermal reflective cracking being the dominant damage mechanism for these cases.

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“…ozone, nitric oxides) and UV radiation (Menapace & Masad, 2018;Morian, Hajj, Glover, & Sebaaly, 2011). Bitumen becomes stiffer and more brittle and thus, pavements are more prone to failure by low temperature and fatigue cracking with increasing ageing of the binder (Eberhardsteiner & Blab, 2017;Farrar, Hajj, Planche, & Alavi, 2013;Mogawer et al, 2015;Steiner, Hofko, Dimitrov, & Blab, 2016;Teshale, Moon, Turos, & Marasteanu, 2011). Since bitumen ageing affects durability and recyclability of pavements crucially, it is important to assess ageing behaviour and resistance to ageing of binders and mixes at the stage of mix design optimisation to achieve cost-and energy-efficient pavements with low maintenance demands, a long service-life and high recycling potential.…”

Section: Introductionmentioning

confidence: 99%

Introducing a nitrogen conditioning to separate oxidative from non-oxidative ageing effects of hot mix asphalt

Steiner

Hofko

Blab

2018

Road Materials and Pavement Design

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Bitumen used as a binder is subjected to ageing that leads to increased stiffness and brittleness. For the simulation of long-term ageing of hot mix asphalt (HMA), most methods are based on conditioning at high temperatures to increase oxidation. This paper investigates the impact of non-oxidative / thermal and oxidative effects on long-term ageing of asphalt mix specimens in the laboratory and aims at separating these effects. Therefore, specimens are placed in a heating cabinet at different temperatures ranging from + 60°C to + 160°C. One part of the specimens is exposed to the air atmosphere, while the other part is stored under nitrogen atmosphere (N-VAPro). Thereby, oxidative ageing is avoided for the nitrogen-stored specimens and the combination of thermal effects can be separated from oxidative effects. The changes in the material behaviour of HMA as a result of the different ageing regimes are investigated by stiffness tests at intermediate temperatures. Furthermore, Dynamic Shear Rheometer (DSR) tests are carried out on virgin, aged binder (RTFOT, RTFOT + PAV) as well as on recovered bitumen of both conditioning groups. The results indicate that conditioning temperatures must be kept below 110°C to prevent the asphalt mixtures from non-oxidative ageing effects. However, atmospheric air conditioning for HMA specimens is only suitable as a long-term ageing procedure for temperatures above 110°C to increase the oxidation rate to an efficient rate. This threshold temperature can also be seen as the limit value for lab-ageing procedures that should not be exceeded to avoid non-oxidative ageing effects that cannot occur in the field due to limited maximum temperatures. Furthermore, a double exponential increase with the ageing temperature on the binder level was shown.

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Impact of Loading Rate and Temperature on Tensile Strength of Asphalt Mixtures at Low Temperatures

Cited by 12 publications

References 1 publication

Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Study on Thermal Reflective Cracking of Asphalt Concrete Overlays on Concrete Pavements Under Moderate Temperature Variations Using Finite Element Model

Introducing a nitrogen conditioning to separate oxidative from non-oxidative ageing effects of hot mix asphalt

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