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Durability of HES-ECC repair under mechanical and environmental loading conditions

Author(s): M. Li, V.C. Li
Paper category: Workshop
Book title: Fifth International RILEM Workshop on High Performance Fiber Reinforced Cement Composites (HPFRCC5)
Editor(s): H.W. Reinhardt, A.E. Naaman
ISBN: 978-2-35158-046-2
Pages: 399 - 408
Total Pages: 10
Language: English

The lack of durability in concrete repairs induces premature repair deterioration and endless “repair of repairs”. This paper suggests High Early Strength Engineered Cementitious Composites (HES-ECC) as a material solution to repair failures under both mechanical and environmental loading conditions. HES-ECC is a new class of HPFRCC, which has been micromechanically designed for concrete structure repair applications with high early strength, high ductility and toughness indicated by multiple micro-cracking behavior under unaxial tension. Experimental study shows that when subject to monotonic flexural loading, the HES-ECC layered repair system showed 100% increased load carrying capacity, and 10 times the deformation capacity of HES-Concrete layered repair system. When under the same level of fatigue flexural loading, HES-ECC layered repair system exhibited significantly longer service life. In addition, the high ductility of HES-ECC could relieve shrinkage induced stresses in the HES-ECC repair layer and at the HES-ECC/concrete interface, thereby suppressing large surface cracks and interface delamination. The concept of translating ECC repair material ductility to the whole repair system durability can be widely applied to many concrete structures repair applications for developing cost-effective and durable concrete repairs.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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