The cracking of asphalt pavement caused by temperature changes is one of the main problems in cold highlands where climate characteristics include a low average temperature and a large variation in temperature. Temperature contraction cracking has a greater relation to the flexural strength of asphalt mixture. The effects of the temperature, nominal maximum size of aggregate and the asphalt-aggregate ratio on flexural strength are investigated in the laboratory combining with the climate features of cold areas. The results show that there are two strategic points, - 10°C and 15°C in the curve of the flexural tensile strength under the five kinds of temperatures. The flexural tensile strength of AC-13 is greater than that of AC-16 at lower temperatures. The asphalt-aggregate ratio is given for the maximum flexural strength of 6.0%-7.0%.The extent of influence on flexural strength is analyzed by variance analysis, revealing that temperature and asphalt-aggregate ratio have a highly significant influence on flexural strength of asphalt mixture. Regression analysis is conducted for the results using a binary quadratic model. The yield for temperature and asphalt-aggregate ratio can be described well by the model.
Research on Flexural Strength of Asphalt Mixture in Cold Highlands
Ninth Asia Pacific Transportation Development Conference ; 2012 ; Chongqing, China
Sustainable Transportation Systems ; 567-573
28.06.2012
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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