Influence of Material Ductility on Performance of Concrete Repair

Premature repair deterioration is induced in concrete repairs through lack of durability. Repair layer cracking results from "new" repair material drying shrinkage restrained by "old" concrete substrate, and repair and concrete substrate interface delamination. A material solution to these common repair failures is investigated in this paper. This study employs a high-early-strength engineered cementitious composite (HES-ECC) developed for concrete repair. High tensile strain capacity several hundred times that of normal fiber-reinforced concrete or normal concrete and high early-age strength (over 47 MPa [6,885 psi] in seven days) is possessed by the HES-ECC. To verify that high HES-ECC ductility can relieve shrinkage-induced stresses at the repair/old concrete interface and in the repair layer, experimental and numerical studies were conducted on a layered repair system. Verification simultaneously suppressed interface delamination and large repair surface cracks. This paper reports on detailed results of these studies.

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  • English

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  • Accession Number: 01142890
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 13 2009 6:46PM