The influence of surface preparation on the behavior of ECC/concrete layer repair system under drying shrinkage conditions

Title: The influence of surface preparation on the behavior of ECC/concrete layer repair system under drying shrinkage conditions
Author(s): Mo Li, Victor C. Li
Paper category : conference
Book title: International RILEM Workshop on High Performance Fiber Reinforced Cementitious Composites in Structural Applications
Editor(s): G. Fischer and V. C. Li
Print-ISBN: 2-912143-93-4
e-ISBN: 2912143942
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 175 - 184
Total Pages: 10
Nb references: 10
Language: English

Abstract: The paper presents the effect of concrete substrate surface preparation on the performance of Engineered Cementitious Composites (ECC)/concrete layer repair system under restrained drying shrinkage. In repair applications where “new” repair materials are bonded with “old” concrete, drying shrinkage often induces surface cracking in the repair materials, together with interface delamination between the repairs and the concrete substrates. Experimental study shows that when a “smooth” concrete substrate surface was present, the interface delamination was large. However, when an adequate bond was achieved by roughing the surface and/or using bonding agent, the high ductility of ECC could suppress large surface cracks and interface delamination, therefore greatly improving durability and structural integrity of the repair system.
The performance of ECC repair, which is dependent on concrete substrate surface preparation, is significantly different from repairs made of brittle or quasi-brittle materials. Discussions are made on the potential impact on the current ACI Repair Guide with the application of ECC as innovative concrete repair material.

Online publication: 2005-05-15
Classification: Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143942.019