Part B-Question 11 (Total Marks for question 11: 4) 11.1 Asphalt consists of a m

Question

Part B-Question 11 (Total Marks for question 11: 4) 11.1 Asphalt consists of a mixture of bitumen and aggregates. Variations in the quantities and qualities of the individual constituents affect the performance of asphalt. Circle all of the statements that correctly describe asphalt and its constituents. a) As in concrete, air voids in asphalt are detrimental to the performance of b) Some air voids are required to improve the performance of asphalt in c) A higher grade of bitumen is less viscous (ie: stiffer), thus providing d) The use of a lower grade bitumen leads to an improvement in the durability e) The use of higher grade bitumen leads to an improvement in the durability an asphaltic material service. greater resistance to rutting. and fatigue capacity of asphalt. and fatigue capacity of asphalt. f Large aggregates are one component of asphalt and are only used as a filler to replace bitumen in order to reduce the cost of the asphalt. The large aggregates have no useful function asphalt. asphalt. g) Large aggregates are used to improve the strength and rutting resistance of h) Large aggregates are used to improve the durability and fatigue capacity of

Explanation / Answer

Answer 11.1-

correct- (a), (c) ,(e), (f), (h)

Answer 12.1

(c) high degree of water permeability

(d) prevention of passage of soil particle

Answer 12.2-

(a) very strong and can support or distribute load

(b) very strong and can resist damage and puncturing

(g) interlock between geotextile and substrate

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