FATIGUE-RESISTANT FLEXIBLE ROAD STRUCTURE
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
Dec 30, 2022
filing date -
Dec 30, 2022
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Abstract
A fatigue-resistant flexible road structure that includes one or more sub-base structural support layers positioned over a compacted earth foundation. At least one of the sub-base structural support layers is an elastic sub-base layer for more completely distributing surface loads. The elastic sub-base layer includes aggregate, filler, binder, and recycled tire rubber. The recycled tire rubber is included in an amount of 3% to 5% by weight of the sum of aggregate, filler, and rubber. The elastic sub-base layer has a fatigue life at least 25 percent greater than a non-elastic sub-base layer without recycled rubber. Further, the elastic sub-base layer has a modulus of elasticity at least 25 percent lower than a non-elastic sub-base layer without recycled rubber.
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