Performance-based evaluation of crack sealing/filling treatment for asphalt pavement
This study investigated the current state of practice for crack sealing/filling. In addition, the crack sealing/filling practice was experimentally evaluated for the effectiveness of crack sealing/filling, the effectiveness of routing, the performance of the different types of crack sealants and fillers. A new test method is proposed to evaluate the bond strength of crack sealing/filling. The key findings from an extensive literature review and nationwide/statewide survey performed in 2012 are the following: 1) 65% of the responses indicated that the routing is required for the crack sealing/filling application; 2) ASTM D 6690 Type II was the most widely used sealant type; and 3) crack sealing/filling equipment availability and their maintenance were the biggest concerns. Based on the two-year experimental investigation, the crack sealing/filling was determined to be effective in preventing the occurrence of pavement surface crack distress. The crack sealing/filling was concluded to be effective in maintaining crack integrity and resisting sealant and filler deformations due to the seasonal crack movement. The routing was not determined to be effective in terms of the pavement performances. However, Adhesive/Cohesive/Spalling (ACS) failure results showed that the routed sections slightly outperformed the non-routed sections. The correlation between the sealant performance grades and the pavement and crack performances with different types of sealants and fillers were poor and insignificant. The study was conducted to assess the applicability of the modified in situ pull-off test as a tool to evaluate the bond strength between the materials and the asphalt pavement surface and the factors affecting the bond strength. The results demonstrated that the modified pull-off test showed its applicability in measurement of bond strength with both weak and strong conditions. Additionally, its results revealed that the cracks treated with a hot-air lance had higher bond strength than the cracks treated with a conventional air compressor on a wet surface. Based on the results, it can be concluded that the moisture presence is the major factor affecting the bond strength.
Haddock, Purdue University.
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