Kajian ini dijalankan bagi menilai prestasi campuran asfalt terubahsuai getah yang digabungkan dengan bahan tambahan Zycotherm. Ciri-ciri perkhidmatan campuran asfalt terubahsuai getah dinilai berdasarkan indeks kebolehkerjaan dan indeks pemadatan tenaga untuk menunjukkan kemudahan campuran asfalt untuk dihamparkan, dikendalikan dan dipadatkan. Selain itu, sifat kejuruteraan campuran asfalt telah dinilai dari segi kekuatan tegangan tidak, ujian kebingkasan, ubah bentuk kekal, rintangan lembapan dan kekuatan ricih. Campuran asfalt telah disediakan dan dipadatkan pada lompang udara 4% untuk mensimulasikan keadaan sebenar ditapak. Sedangkan rintangan lembapan diuji dengan menggunakan campuran asfalt pada 7% lompang udara. Berdasarkan dapatan, campuran asfalt terubahsuai mempunyai prestasi yang lebih baik dari segi sifat-sifat kekuatan tegangan, ubah bentuk kekal, ujian kebingkasan, kekuatan ricih dan rintangan lembapan. Daripada indeks kebolehkerjaan dan tenaga pemadatan, campuran asfalt terubahsuai adalah lebih baik daripada campuran asfalt diubahsuai. Prestasi campuran asfalt umumnya mengutamakan kepada campuran asfalt tidak terubahsuai. Oleh itu, campuran asfalt terubahsuai mempunyai prestasi yang lebih baik terhadap trafik yang tinggi intensiti dan gandar beban.
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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.
Performance of rubberized modified asphalt mixutres incorporating silane additive zycotherm / Lim Wee Zheng