Asphalt concrete, when subject to continuous loading versus impact loads: a. is

Question

Asphalt concrete, when subject to continuous loading versus impact loads: a. is less resilient b. is more resilient c. has the same resiliency The following substance chemically deteriorate asphalt cement: a. calcium chloride (road salt) b. sodium chloride (table salt) c. benzene (paint thinner) d. ammonium chloride (household cleaner) Name three properties of aggregate (other than gradation) which are important for asphalt concrete. Indicate why they are important. Discuss (in four sentences or less) the advantages of gyratory compaction (SHRP Program) over impact compaction (Marshall Test). An asphalt briquette has a mass of 739.2 grams in air and 411.7 grams submerged. Find the density in kg/m^3 and lbs/ft^3 The design engineer specifies a concrete strength of 5000 psi. Determine the required average compressive strength required for: a. A new plant where s is unknown b. A plant where s = 300 psi for 16 test results c. A plant with extensive history of producing concrete with s = 200psi

Explanation / Answer

Answer 7) Option (C) has the same resiliency is correct

Expalnation: Asphalt concrete has same value of resilience hence it is used in making flexible pavements.

Answer 8) Option (C) Benzene paint thinner is correct

Expalnation: Asphalt in the pavement gets dissolved in the benezene paint thinner. and bonding of aggregate losses by the same.

Answer 9) three properties are

a. Absorption: abosorption relates to the particles capacity of taking in the liquid.it is importatant because it may lead to freezing and thawing in aggregates.

b. Porrosity : it may lead to fractures in asphalt concrete after paving.

c. Strength: it is the measure of property of aggregate to withstand the loading & crushing when concrete is laid and subjected to loading.

Answer 10) In gyratory compaction static stress is applied in one direction while soil is subjected to gyratory motion advantages:

a. shear resistance of the mixture can be assesed throughout therange in density throughout the range in density from as compacted to traffic densified.

b. combined the effects of aggregate gradation.

c. Design mix can be evaluated to simulate acceptable feild production variations in gradation and asphalt particularly combined intrest in mineral filler and asphalt binder.

sufficiently answered first 4 questions

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