Performance of rubberized modified asphalt mixutres incorporating silane additive zycotherm
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Date
2018-06
Authors
Lim, Wee Zheng
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Abstract
The purpose of this study is to evaluate the performance of rubber modified
asphalt mixture incorporating silane additive Zycotherm. The service characteristics of
rubber modified asphalt mixture were evaluated using workability index and compaction
energy index to indicate the ease of asphalt mixture to be placed, handling and
compacted. Besides, the engineering properties of asphalt mixture were evaluated in
terms of Indirect Tensile Strength (ITS), Resilient Modulus, permanent deformation,
moisture susceptibility resistance and Leutner Shear (LS) Test. The asphalt mixture was
prepared and compacted at 4 ± 1 % air voids which according to the Standard of Public
Work Department of Malaysia’s (PDW), whereas the moisture susceptibility resistance
was tested with using asphalt mixture compacted at 7 ± 1 % air voids. Based on the
results, it was found that crumb rubber modified asphalt mixtures have a better
performance in terms its tensile properties, permanent deformation, resilient modulus,
shear resistance and moisture resistance. From the workability and compaction energy
index, unmodified asphalt mixture is better than modified asphalt mixture. The asphalt
mixture performance generally favours to the modified asphalt mixture. Therefore,
modified asphalt mixture has better performance against the high traffic intensity and
axle loads.