A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Acoustic Emission-Based Test to Determine Asphalt Binder and Mixture Embrittlement Temperature
A major form of deterioration in asphalt pavements constructed in cold climates is low temperature (or thermal) cracking, resulting from the restrained contraction of the asphalt mixture during cooling cycles. Pavement temperature is lowest at the surface and temperature changes are also the highest at the surface. Contractive strains induced by pavement cooling cause thermal tensile stress development in the restrained pavement layer. The induced thermal stresses are greatest in the longitudinal direction of the pavement (in the direction of traffic). Thermal cracking in the pavement manifests itself as transversely-oriented, surface-initiated cracks of various lengths and widths. For very severe cooling cycles (very low temperatures and/or very fast cooling rates) transverse thermal cracks may develop at specific locations within the pavement under one or very few cooling cycles. This is generally referred to as low-temperature cracking or single-event thermal cracking. Additional cracks will develop at different locations as the pavement is exposed to subsequent cooling cycles. For milder cooling conditions, cracks may advance and develop at a slower rate, such that it may take several cooling cycles for cracks to propagate completely through the surface layer. This is generally referred to as thermal fatigue cracking. Both phenomena are typically classified under the general category of thermal cracking in pavement engineering.
Acoustic Emission-Based Test to Determine Asphalt Binder and Mixture Embrittlement Temperature
A major form of deterioration in asphalt pavements constructed in cold climates is low temperature (or thermal) cracking, resulting from the restrained contraction of the asphalt mixture during cooling cycles. Pavement temperature is lowest at the surface and temperature changes are also the highest at the surface. Contractive strains induced by pavement cooling cause thermal tensile stress development in the restrained pavement layer. The induced thermal stresses are greatest in the longitudinal direction of the pavement (in the direction of traffic). Thermal cracking in the pavement manifests itself as transversely-oriented, surface-initiated cracks of various lengths and widths. For very severe cooling cycles (very low temperatures and/or very fast cooling rates) transverse thermal cracks may develop at specific locations within the pavement under one or very few cooling cycles. This is generally referred to as low-temperature cracking or single-event thermal cracking. Additional cracks will develop at different locations as the pavement is exposed to subsequent cooling cycles. For milder cooling conditions, cracks may advance and develop at a slower rate, such that it may take several cooling cycles for cracks to propagate completely through the surface layer. This is generally referred to as thermal fatigue cracking. Both phenomena are typically classified under the general category of thermal cracking in pavement engineering.
Acoustic Emission-Based Test to Determine Asphalt Binder and Mixture Embrittlement Temperature
W. G. Buttlar (author) / B. Behnia (author) / H. M. Reis (author)
2011
51 pages
Report
No indication
English
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