Campuran asfalt suam (WMA) telah diterima secara meluas oleh industri asfalt terutamanya di Amerika Syarikat kerana kemampuannya yang membolehkan penghasilan campuran asfalt suam dan pemadatan pada suhu 20°C hingga 55°C, lebih rendah berbanding campuran asphalt panas (HMA). Oleh itu, WMA telah dilabelkan sebagai teknologi mesra alam kerana ia mengurangkan pelepasan bahan toksik ke udara. Namun demikian, penurunan suhu penghasilan WMA menimbulkan kecenderungannya terhadap masalah kelembapan, kelekatan dan kekuatan. Untuk mengatasi masalah berikut, penambahan agen anti-pelucutan telah diperkenalkan. Antara agen anti-pelucutan yang digunakan dalam kajian ini adalah ZycoTherm dan Tough Fix. Thesis ini bertujuan untuk mengkaji kesan penambahan agen anti-pelucutan, penuaan dan suhu pernyediaan terhadap ciri dan perekatan bitumen PG 64. Ujian hentaman telah dijalankan atas asfalt dengan mengunakan acuan yang baru direka. Keputusan analysis menunjukkan bahawa rekatan adalah paling kuat pada suhu 35°C dalam keadaan penuaan jangka panjang. Selain itu, keputusan keseluruhan menunjukkan bahawa penambahan ZycoTherm dan Tough Fix memberi kesan dalam meningkatkan prestasi asfalt dari segi kukuatan perekatan dan keliatan. Teknik analisis imej juga digunakan untuk mengukur kegagalan perekatan yang dialami oleh asfalt selepas menjalani ujian hentaman. Melalui teknik ini, peratusan kegagalan perekatan didapati meningkat apabila mengalami penuaan jangka panjang dan disediakan pada suhu yang rendah.
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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.
Effects of aging condition, preconditioned temperature and anti-stripping agent on the adhesive and cohesive behaviour of asphalt binder and mastics / Goh Xiao Wen