| Summary: | 博士 === 國立中央大學 === 土木工程研究所 === 92 === Under excellent quality control during construction period, concrete pavement will have higher capacity for traffic load, lower maintenance cost, and longer service life.
Although considerable expenses spent to maintain the concrete pavement, many repaired cases repeatedly failed. Thus, concrete pavement rehabilitation becomes a difficult task for engineers. Regarding the concrete pavements constructed during early stage, it is nearly out of their service life and should be fully replaced or completely overlaid by topping material. Nonetheless, for other pavements which are still having sound structures, properly perform partial-depth repair for dealing with the initial failures will not only prevent the damage area from expansion, but also reduce the cost from further rehabilitation in the future and extend the service life of the pavement.
The tests for basic engineering properties of repair materials, the evaluation of bonding compatibility of repairing interface between repair materials and original concrete were presented in this study. In addition, 3D finite element models studied how the changes of shape and size of repair area influence the stress distributions on the repaired interface when applying various repair materials. To develop a reinforced repairing method for enhancing the performance of partial-depth repair for corner and side damages of concrete pavement, this investigation also studied the fundamental parameters influencing the performance for anchorage, and simulated the behavior of the repairs conducted by reinforced repairing method. Furthermore, a field practice was conducted in Taishan section of national highway no. 1 to proof the feasibility of the reinforced repairing method.
The results indicate that the cement based materials offered better compatibility with original concrete than the resin based materials, and the stresses in the repaired area were relatively lower when using the cement based materials as repair materials. Besides, resin based repair materials were not suitable for the areas with significant changes in temperature. The durability tests also reveal that the fastening performance of the anchor was not affected by the cycling when the depth of anchor embedment reached 8 cm. For corner damages, epoxy mortar is not suitable in square repair areas; moreover, triangular or spherical repair areas are recommended for small repairs. For edge damages, width of repair area should maintain 10~15 cm, and the length/width ratio of the repair area should possibly approach 2.
Finally, the results of lab tests, the technique reports, the published papers and the airport maintenance specifications were summarized to compose “Guidelines for conducting partial-depth repair in concrete pavement” and “Illustrations of procedures for performing reinforced repairing method in partial-depth repairs of concrete pavement” to improve the effectiveness of concrete pavement rehabilitation.
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