Hw 2 - CCEV360-04 January 27, 2008 Dillon Gauthier Atkins...

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CCEV360-04 January 27, 2008 Dillon Gauthier Atkins Ch. 4 #18-30, omit 28 18. a. Soft particles that are used in road bases can be harmful because of the constant traffic, will become rounded, or polished, making the road surface less skid-resistant. Aggregates in roadbeds are subjected to innumerable cycles of load application and removal. Particles that tend to break or powder will result in a change in gradation and other properties and reduced strength of the structure. b,c. Aggregates in asphalt and concrete pavements that are too soft will crumble, and the broken particles will not be cemented together, and would have no tensile strength. 19. Original mass: 5008.7 g Final mass: 2764.9 g % loss = (5008.7 – 2764.9)/5008.7 = 44.8% Loss is 44.8%, which is above the allowable 40%, therefore fails the abrasion test. 20. Aggregates that are exposed to cycles of freezing and thawing will undergo stresses caused by the freezing water in the aggregate pores. Water freezing inside aggregate pores will expand and may cause cracking, especially if it’s numerous cycles of freezing and thawing (winter). 21. The soundness test is used to measure an aggregate’s susceptibility to
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This note was uploaded on 04/07/2008 for the course CCEV 360 taught by Professor Lambrechts during the Spring '08 term at Wentworth Institute of Technology.

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Hw 2 - CCEV360-04 January 27, 2008 Dillon Gauthier Atkins...

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