CHAPTER I
INTRODUCTION
1.1 Background.
In the past forty years, Malaysia has developed rapidly into an industrialized country, producing a variety of products. There was unparallel amount of development in infrastructure especially in road network system. There are approximately 73 403 km of roads with a staggering 78% of paved road and the remaining are soil/earth or gravel roads (K.P.Chong, 2004). This system has served to great importance to the development of Malaysia. However, many of these roads have reached a point where it needs maintenance to preserve it at an acceptable level. Therefore, a pavement rehabilitation process is needed urgently to carry out maintenance on these roads.
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Rehabilitation is a process to recover the condition of the defected roads. Asphalt overlays, mill, replacing and reconstruction are among the technique used to rehabilitate the existing asphalt. In mid 80's, the recycling technique was introduced in Malaysia (K.P.Chong, 2004). Since......
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