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原文传递 Performance Evaluation and Specification of Trackless Tack

题名：	Performance Evaluation and Specification of Trackless Tack
作者：	Wilson, B.; Seo, A. Y.; Sakhaeifar, M.
关键词：	Pavements##Trackless tack coat##Tracking resistance##Cracking resistance##Rheology##Bond strength##Bond energy##Pull-off test##Interface shear test##Texas Department of Transportation(TxDOT)##
摘要：	Several trackless tack products have come to market in Texas; however, there are currently no specifications to ensure the products have trackless properties and adequate bond strength. The objectives of this project were to (1) evaluate the tracking resistance of different trackless tacks, (2) evaluate bond strength and other construction parameters of different trackless tacks, (3) construct test sections in the field to evaluate performance, and (4) develop test procedures and specifications for trackless tack. For tracking resistance, a track-free time test and a dynamic shear rheometer (DSR) tackiness test both distinguished between trackless tack and conventional tack. The DSR test further distinguished among stiff-residue and soft-residue trackless tacks. For bond strength of laboratory samples, all samples had acceptable bonding, but stiff-residue trackless tack had the highest bond energy, followed by soft-residue trackless tack, conventional tack, and then no tack. Higher ambient and hot mix asphalt (HMA) compaction temperatures improved bonding. Bonded trackless tack samples were resistant to fatigue cracking and cold temperature delamination. Bond strengths from field samples were considerably lower (15–95 psi) than for lab-molded samples (100–200 psi) and varied among different overlay projects. This was likely due to different project conditions (e.g., pavement surfaces, HMA overlay designs, compaction temperatures). In most cases tack rate did not affect the bond strength. The researchers recommend adopting the DSR tackiness test and track-free time test to qualify trackless tack materials. The researchers also recommend adopting the shear bond strength test. Draft test methods and a trackless tack material specification are provided.
总页数：	142
报告类型：	科技报告