Evaluation of Low Temperature Cracking Indicators of Hot Mix Asphalt Pavement

Bagdat Teltayev

《International Journal of Pavement Research and Technology》 7卷5期 (2014/09) Pp. 343-351

https://doi.org/10.6135/ijprt.org.tw/2014.7(5).343

並列摘要

Low temperature cracking is one of the prevalent types of hot mix asphalt pavement defects, and there are many methods of its evaluation. In this paper, the indicators of hot mix asphalt pavement low temperature cracking are evaluated by a combined approach, where hot mix asphalt tensile strength at low temperatures has been determined by testing in conditions of deformation with constant rate, and low temperature stress has been calculated based on integral equation of linear viscoelasticity theory. Conditions of air cooling have been considered through the temperature falling (cooling) rate. It has been ascertained that for the considered hot mix asphalt at cooling rate from 0.4°С/h to 1.6°С/h, Critical stress and Critical temperature do not depend on cooling rate: critical stress σ_(cr)=6.0 to 6.2 MPa, Critical temperature Т_(cr)=-19 to -21°С. The indicator, characterizing the low temperature stress increase rate in hot mix asphalt pavement, at Critical time also does not depend on the cooling rate and has constant value equal to 2.7.

並列關鍵字

Asphalt mixture ； Critical stress ； Critical temperature ； Critical time ； Low temperature cracking