A Self-Learning Manual - Institution of Engineers Mauritius

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A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU For ground penetrating radar, it sends radio waves into the ground and receives signals from reflections from utilities. It has the advantage of locating both the depth and alignment of utilities. More importantly, it can detect both metallic and non-metallic utilities. However, it suffers from the disadvantage that it is quite expensive and interpretation of data is not simple. Reference is made to LD, DSD (2000). 268
A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU Level Two (Advanced FAQs) Part I: Road Joints 1. Which joint sealant is better, acrylic, polysulfide, polyurethane or silicone? (RJ1) There are four generic types of joint sealant with high performance. Their properties are highlighted in the following table: Acrylic Polysulfide Polyurethane Silicone Accommodate 12% movement. Exhibit shrinkage upon curing Solvent-based. Poor recovery in high cyclic movements Exhibit excellent chemical resistance Good performance in submerged conditions. 269 Accommodate 50% movement. Excellent bonding, can be used without primer Good UV resistance Accommodate 50% movement. Excellent low temperature movement capability Excellent UV and heat stability 2. Can joint sealant provide a perfect watertight seal in joints? (RJ1) The two main principal functions of joint sealant are to minimize the entry of surface water and prevent the ingress of incompressible material from entering the joint. Other minor function of joint sealant is to reduce the possibility of corrosion of dowel bar by the entrance of de-icing chemicals. Water entry into joints is undesirable because it leads to the softening of subgrade and pumping of subgrade fines under heavy traffic. However, it is impractical to maintain a completely watertight pavement structure. In fact, vacuum tests show that no sealants could provide 100% watertight seal. The current philosophy to combat water ingress into joints is only to minimize but not to completely prevent water from entering the pavement structure. Instead, a permeable subbase is designed to remove water from the pavement. 3. In expansion joints why are plastic sleeve normally used in dowel bars instead of debonding agent? (RJ2) The purpose of plastic sleeve or debonding agent around dowels bars in
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A Self-Learning Manual - Institution of Engineers Mauritius

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