Abstract
A statewide condition survey of continuously reinforced concrete (CRC) pavements was conducted in Indiana in 1972. The survey was statistically designed and the resulting data were analyzed by using a weighted least squares analysis of variance procedure. The results of the survey were used to evaluate the effects of subbase and subgrade type, the methods of paving, steel placement and steel fabrication, concrete slump and traffic on CRC pavement performance. The measure of performance was extent of failures, parallel cracks with less than 30 in. (76 cm) crack spacing, random cracks, spalled cracks and edge pumping. The results of the statistical analysis show that subbase type, the methods of steel placement and steel fabrication, concrete slump and traffic significantly influence CRC pavement performance. Gravel subbases showed poorer performance than crushed stone and bituminous stabilized subbases. Better performance was indicated where deformed wire fabric or loose bars were used as compared with the use of tied bar mats. Depressed steel resulted in superior performance than using steel preset on chairs. The data showed little difference between performance of pavements that were slipformed as compared to those which were side formed. Relative to good performance, an optimum range of concrete slump between 2.0 to 2.5 in. (5.0 to 6.5 cm) was indicated. It was further noted that distress of CRC pavements is associated with traffic. Most of the pumping was observed on pavements with gravel subbases though some pumping was also indicated where bituminous stabilized or crushed stone subbases were used.
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