Major Factors Influencing the Performance of Structural Repair


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Title: Major Factors Influencing the Performance of Structural Repair

Author(s): Ying-Suyuan and Marton Marosszeky

Publication: Special Publication

Volume: 128


Appears on pages(s): 819-838

Keywords: beams (supports); creep properties; modulus of elasticity; moment distribution; performance tests; polymer-cement concrete; repairs;serviceability; shrinkage; spalling; stiffness; tensile strength; Construction

Date: 11/1/1991

Six single-span beams and two two-span beams with preformed cavities simulating concrete spalling were cast and long-term tests were carried out to investigate the performance of structural repair. The early age properties of three types of polymer-modified concrete, i.e., tensile strength, modulus of elasticity, shrinkage and creep, were investigated under the same environmental conditions as the beams. The test results show that the effect of shrinkage of polymer cement concrete on the stress at serviceability of a repaired structure is quite significant. The restrained shrinkage can lead to cracking in the repair patch and to additional tensile stresses in the substrate. Simulation analyses were also carried out to support this experimental investigation. An analytical method has been calibrated by the test results. Tests and analyses show that the major factors influencing the performance of structural repair include free shrinkage, creep coefficient and tensile strength and ultimate tensile strain in early age properties of a repair material. Stiffness of the member and moment redistribution in the repaired structure are also important.