Term
| What determines the minimum thickness of hot-mi asphaltic concrete layers? |
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Definition
| Aggregate size; the thickness of the compacted pavement should be at least twice the. maximum nominal particle size of the aggregate |
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Term
| How are courses of asphaltic concrete bound together? |
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Definition
| a special tack coat of asphalt cement is sprayed on to the surface prior to placing the next course. |
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Term
| What are the options for laying bases of asphaltic concrete? |
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Definition
directly on compacted sub grade
compacted aggregate base course
on a base of concrete pavement. |
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Term
| What is the benefit of using a base course with asphaltic concrete instead of using a full-depth design? |
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Definition
| the aggregate base course minimizes the potential damage caused by frost heave and helps in the distribution of load over the sub grade; which can reduce the thickness of the asphaltic concrete layer. The base course can be treated with asphaltic cement to increase its strength and load distribution. |
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Term
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Definition
| The spraying of asphalt onto an aggregate base. Binds the base together and binds base layer to asphaltic layer above. A coated layer can have twice the load bearing strength of an untreated base. |
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Term
| What is a drawback of an aggregate base course for asphaltic concrete? |
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Definition
| an aggregate base course has no capability to transfer tensile forces, whereas the full-depth asphaltic concrete pavement can transfer both compressive and tensile forces and therefore distribute loads over a larger area of the subgrade; requiring less thickness. |
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Term
| What is the desired void content for asphaltic paving? |
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Definition
| 2-8% for dense graded asphaltic concrete design mixes. Removes most voids, but leaves enough to allow for thermal expansion. |
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Term
| What is the usual thickness of asphaltic surface treatments? |
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Definition
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Term
| What are the 5 categories of damage to asphaltic concrete pavement? |
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Definition
| cracks, distortions, disintegration, slippery surfaces, and surface treatment problems. |
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