Effects of aging condition, preconditioned temperature and anti stripping agent on the adhesive and cohesive behaviour of asphalt binder and mastics
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Date
2017-06
Authors
Goh, Xiao Wen
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Abstract
Warm Mix Asphalt (WMA) has gain wide acceptance by asphalt industry
especially in the United States due to its ability to lower asphalt mixing and compaction
temperatures by 20°C to 55°C compared to the conventional Hot Mix Asphalt (HMA).
This characteristic makes WMA a greener technology as less emission will be released
into the air. However, the lowered temperature gives rise to greater moisture
susceptibility, which related to coating and bonding problems. Addition of anti-stripping
agents is a feasible solution to the current predicament. The two anti-stripping agents
used were ZycoTherm and Tough Fix. The impact test was conducted, using a newly
fabricated mould, and the effects of aging conditions and preconditioning temperatures
of bitumen incorporating either ZycoTherm or Tough Fix, were investigated. The
analysis results showed that bond strength of binder and mastics was at their strongest at
intermediate temperature (35°C) and it improved directly proportional to the aging
condition. The overall test results indicated that both ZycoTherm and Tough Fix had
significant effects on improving the performance of bitumen in terms of bond strength
and fracture toughness. Image analysis technique was used to classify the adhesive and
cohesive failures of bitumen after undergoing impact test. It was found that percentage
adhesive failure of bitumen increases at aged condition and low temperature.