Final Exam_Civil Engineering_Civil Engineering Materials,CE-102

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Q#1: a)What are the major components of bitumen? What are SARA components and discuss the importance of SARA components in flexibility of bitumen? b) What is flash and fire point of bitumen? Discus... s the application of this test in the field in detail c) What is softening point of bitumen? What are the applications of this test in the field? Discuss in detail 2 a) What are Paints and Varnishes? b) Discuss the composition of paints in detail? c) Discuss the characteristics of good paint in detail? Q#3. a) Discuss various defects in paints with suitable sketches? b) What do you mean by bitumen modification? Why and what are the additives used to modify bitumen? Solution#3 Ans#3 (a) DEFECTS IN PAINTS: Bleeding: Its an disruption and straining of the painted surface by chemical action. It happens when an incorrect paint is applied over another such as bituminous one. The remedy is to remove the old paint and renew with a like one. Blistering: It is a common failure caused by poor adhesion or by moisture pushing off the paint. It is prevented by having a dry background, proper prining and removal of very resionous knots. [Show More]

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