Transverse crack is one of the major distresses in asphalt pavements. Theobjective of this research is to establish an effective evaluation methodof transverse crack in asphalt pavements on China's freeways. Two single indicators are presented, which assess the key properties of transverse crack. One single indicator is the Transverse Crack Spacing (TCS) and the other single indicator is the Transverse Crack Width Ratio (TWR). The Transverse Crack Condition Index (TCCI) is then developed as a comprehensive evaluation index of transverse crack in this study. The feasibility of this evaluating method was checked with the analysis of field detection data from Wu Xuan freeway in Anhui Province and two other freeways in Jiangsu Province, China. By introducing "experts evaluation mark technology", the index TCCI was converted into 0-100 scale and the threshold value was confirmed. Furthermore, the corresponding maintenance treatment method was determined according to the different transverse crack condition levels. The results showed that the TCCI can make a good assessment to the transverse crack in freeway asphalt pavements. The index value can be correlated with theactual condition of the in-site pavement. Therefore, a scientific and rational evaluating method is established for freeways transverse crack.
Samenvatting