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The bond of pavement l ayers plays an important role to achieve good performance of a flexible pavement. It has been observed that the poor bonding b etween pavement layers causes pavement overlay distresses such as compaction difficulty, top down cracking, pot holes, premature fat igue and surface l ayer delamination. Slippage failure i s the most commonly observed problem often occurring at the locations where traffic accelerates, decelerates or turns.
In order to prevent such distresses, t ack coat will be sprayed between the pavement l ayers. A variety of Asphalt materials are used for t ack coats. A tack coat is an application of a bituminous emulsion or bituminous binder between an existing bituminous / concrete surface and a newly constructed bituminous overlay. . Normally, hot bituminous binders, cutback bitumen or bituminous emulsions are used as tack coat materials. This s tudy is aimed to evaluate the bond st rength at the interface between pavement layers by performing laboratory t ests. In this three special attachments are fabricated for use in Marshall Loading Frame to finding the performance of tack coat laid at the interface between Bituminous Concrete ( BC) and Dense Bituminous Macadam ( DBM) layers in the laboratory. In this study, the results of the specimens prepared with 100 mm and 150 mm diameter specime ns using two types of normally used emulsions, named CMS - 2 and CRS- 1 as tack coat of application rates varying at 0. 30 kg/ m 2 , 0. 35 kg/ m 2 and 0. 40 kg/ m 2 made at 250 C temperature are presented. It is observed that CRS - 1 as tack coat provides higher interface bond strength value compared to CMS - 2.
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