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

Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland
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Materials 2018, 11(11), 2118; https://doi.org/10.3390/ma11112118
Received: 27 September 2018 / Revised: 18 October 2018 / Accepted: 24 October 2018 / Published: 28 October 2018
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. View Full-Text
Keywords: asphalt mixture; low-temperature cracking; tensile strength; strength reserve; flexural strength; uniaxial tension stress test (UTST); Thermal Stress Restrained Specimen Test (TSRST); Bending Beam Test (BBT); Semi-Circular Bending Test (SCB) asphalt mixture; low-temperature cracking; tensile strength; strength reserve; flexural strength; uniaxial tension stress test (UTST); Thermal Stress Restrained Specimen Test (TSRST); Bending Beam Test (BBT); Semi-Circular Bending Test (SCB)
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MDPI and ACS Style

Pszczola, M.; Szydlowski, C. Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods. Materials 2018, 11, 2118. https://doi.org/10.3390/ma11112118

AMA Style

Pszczola M, Szydlowski C. Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods. Materials. 2018; 11(11):2118. https://doi.org/10.3390/ma11112118

Chicago/Turabian Style

Pszczola, Marek, and Cezary Szydlowski. 2018. "Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods" Materials 11, no. 11: 2118. https://doi.org/10.3390/ma11112118

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