The concrete for pavement repair must have very high-early strength for opening to traffic as soon, good anti-shrinkage and anti-cracking performance, interfacial bond between old and new concrete surface besides the basic pavement performance. High fluidity is also needed for…
The concrete for pavement repair must have very high-early strength for opening to traffic as soon, good anti-shrinkage and anti-cracking performance, interfacial bond between old and new concrete surface besides the basic pavement performance. High fluidity is also needed for simplifying repairing operation and for guaranteeing the repair quality. In a sense, high fluidity is conflict with super high-early strength. In this paper, focusing on the early flexural strength, interfacial bond, shrinkage and cracking performance, the preparing and testing of high-fluidity and super high-early strength concrete (HFESC) for pavement repair was investigated. The repair concrete material, which prepared with Sulphoaluminate cement, Amino-superplasticizer and RF admixture, has 3.5MPa 5h-flexural strength, 20MPa 5h-compressive strength and 200mm slump value. The laboratory test and field pavement repairing results revealed that the concrete has high fluidity and good mechanics performance and durability, which can be used in rapid repair of concrete pavement. 1 INSTRUCTIONS 1996), interfacial bond between old and new concrete surface for long term repair effect besides Cement concrete pavement (CCP in short) is the basic properties (Morgan 1996). High fluidity is possessed of traffic safety, stability and durability also needed for simplifying repairing operation and comparing with asphalt pavement. Besides which, for guaranteeing the repair quality (Palacios et al. the comprehensive cost especially maintenance 2009, Yang et al. 2000). Considering the stress expanse of CCP is lower than that of asphalt characteristics of CCP and the actual specifications pavement. While the rehabilitation of pavement of cement concrete pavement design, flexural surface distress, once it occurs, must be conducted in strength was used as control index and compressive time for avoiding the serious pavement damage.