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Title: The use of recycled vehicle tyre on road paving in Hong Kong
Authors: Wong, Cheuk-ching
Degree: M.Phil.
Issue Date: 2006
Abstract: In Hong Kong, more than half of the highways are paved with asphalt, some of them are requiring resurfacing and inlaying due to the end of service life. With the ever-increasing traffic engineers have been trying to develop a new mix with a better and durable performance. The main research effort, so far, has been in introducing proprietary modifiers, additives and fibers to asphalt cement. However, disposal of waste tires (a valuable resource for pavement construction in many other countries) carries on and now has been becoming a serious environmental concern in Hong Kong. Over 2 million wasted tires are discarded in Hong Kong each year. The Government's latest budget plan stated that a sales tax on tires would be introduced and effective in the middle of 2006. The money from the sales tax of tires would be used as a fund for conducting research in waste tire recycling. This study aimed to conduct a comparative study of crumb rubber modifier on high temperature susceptibility of wearing course mixture is conducted in the hope to gain basic information on using crumb rubber modified mixtures in Hong Kong. This study investigates the effects of different sizes of crumb rubber modifier (CRM) on the high temperature susceptibility of three gradations (AC-10, AC-20 and PA) of wearing course mixtures. A wet process and 10% CRM by total weight of binders were used in these studies and the control variables for these studies included three CRMs of sizes 0.15mm, 0.30mm and 0.60mm. The evaluations were twofold. Firstly, a comparison of the properties of those modified and unmodified binders at a wide range of testing temperatures and ageing conditions was conducted. Secondary, a comparison of the rutting resistance of the CRM and conventional mixtures was made. The results show that all the CRMs have overall contributed to better performance of both binders and mixtures at high temperatures. In addition, among these three CRM sizes, mixtures modified with 0.15mm CRM exhibited the best effect on the dense-graded mixture (AC-10 and AC-20) whereas mixtures modified with 0.60mm CRM exhibited the best effect on the open-graded mixture of porous asphalt (PA).
Subjects: Hong Kong Polytechnic University -- Dissertations
Waste products as road materials
Tires -- Recycling
Pages: xv, 169 leaves : ill. ; 31 cm
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