United States Department of Transportation
i
Mitigating Joint Reflective Cracks using Stone Interlayers : Case Study on Louisiana Highway 5, Desoto Parish : Research Project Capsule
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2017-12-01
[PDF-189.80 KB]
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Abstract:When Portland cement concrete (PCC) pavement reaches an intolerable level of service, it is commonly overlaid with asphaltic concrete (AC) and is referred to as a composite pavement. Even though AC overlays are designed to resist failure mechanisms such as fatigue cracking and rutting, underlying cracks in the PCC pavement, particularly at joints, often reflect through the AC overlay. Reflective cracking in a composite pavement is caused when discontinuities (cracks or joints) in underlying layers propagate to the surface due to traffic loading and thermal stress, allowing water infiltration through the cracks and subsequent failure of the overlay and deterioration of the base and subgrade layers. Reflective cracking in AC overlays represents a serious challenge associated with pavement rehabilitation. The Louisiana Department of Transportation and Development (DOTD) has experimented with various treatments and techniques to control reflective cracking since the 1970s. One crack-control treatment involves placement of a stone interlayer over the PCC pavement prior to the AC overlay. The purpose of this project is to monitor the effectiveness of stone interlayers in composite pavements, determine the depth of stone required to prevent reflective cracking at the PCC joints, and measure the movement of the PCC joints under traffic loading.
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