CM Lab 6-Asphalt - VMA was found to be 16.9% which is...

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CVE 474 Construction Materials/ Concrete Lab Experiment #5: Asphaltic Concrete: Tests for the Physical Properties of Ingredients and Mix Design by the Marshall Method 5/17/2011 Jonathan Brate Discussion/Questions: 1. Aside from the value obtained for the percent of Asphalt content by weight of aggregate, which was 1305.33, the stability of this mix meets the 1600 lbs minimum criteria. While there are some points between 3% and 5%, there are also quite a few that range from 2% to 7%, therefore, the specified air voids % criteria is not met. Most of the points are
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between 10 and 15 on the flow graph, however they range from 10 to 18. VFA specifications are not met as the points range from 65 to 90, not 65-75. The minimum
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Unformatted text preview: VMA was found to be 16.9% which is greater than 13%. 2. Pavements with heavier traffic will have higher specified values of stability but lower limits on flow because too much asphalt leads to stability problems and too little asphalt leads to durability problems. Stability increases with an increase in asphalt then drops off because only so much asphalt can be added before it weakens the mixture. 3. Possible negative behaviors that may occur if air void % goes outside the specified range of 2% to 6% include cracking, over-saturation, under-saturation, and potholes....
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CM Lab 6-Asphalt - VMA was found to be 16.9% which is...

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