Experimental Study on Crack-Bridging Ability of ECC for Repair Under Train Loading Flexural Fatigue of High and Ultra High Strength Fiber Reinforced Concrete

Title: Experimental Study on Crack-Bridging Ability of ECC for Repair Under Train Loading
Flexural Fatigue of High and Ultra High Strength Fiber Reinforced Concrete
Author(s): Hiroshi Inaguma, Masaki Seki, Kumiko Suda
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: 499 - 508
Total Pages: 10
Nb references: 4
Language: English

Abstract: Cracks on the beams of railway viaducts tend to move under active loadings of trains passing over them, which can be deleterious in terms of the ingress of detrimental factors or can be a trigger of spallings of the cover concrete. In this study the crack-bridging ability of ECC (Engineered Cementitios Composite), which is one of the HPFRCC materials with tensile strain hardening performance generating smaller cracks due to their multiple crack characteristic, is investigated as a repair material. In the experiment after an introduction of several cracks by a static loading for two RC beam specimens one of which has ECC applied on its bottom surface, fatigue tests of 17 million cycles are conducted giving the cracks such a small amplitude of movement as can be observed on real viaduct beams when trains pass on them.
As a result, it is found that ECC has an effectiveness of lowering the growth and amplitude of the crack width on the base concrete under fatigue loadings. The results also show that little crack dispersion is performed with only one or two small cracks generating on the ECC surface at the openings of the base concrete cracks, however the amplitude of the movement of the new cracks width on the ECC surface is small (less than 0.02mm).
Keywords: railway reinforced concrete bridge, Tokaido Shinkansen, crack switching width, carbonation alleviation countermeasure, ECC, fatigue test

Online publication: 2005-05-15
Classification: Special Considerations
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143942.054