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Crack Attenuating Mixture Texas Department of Transportation [case study]
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2021-12-01
[PDF-988.45 KB]
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Abstract:This is one of five case studies highlighting FHWA’s Every Day Counts initiative known as Targeted Overlay Pavement Solutions (TOPS). The purpose of TOPS is to integrate innovative overlay procedures into practices to improve performance, lessen traffic impacts, and reduce the cost of pavement ownership. Reflective cracking can be a concern for rehabilitation projects. Blankenship (2019)1 found that cracks typically migrate approximately one inch per year through conventional overlays. According to Blankenship’s research, properly designed crack attenuating mixture (CAM) interlayers may reduce the number of reflective cracks and slow the rate of reflective cracking by up to 50 percent. The concept of CAM interlayers was initially developed as a reflective cracking mitigation strategy for Jointed Reinforced Concrete Pavement rehabilitation. However, according to Kwater, TxDOT has used these mixes successfully on Continuously Reinforced Concrete Pavement (CRCP) and asphalt surfaces where crack mitigation is desired.
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