Experimental investigation of static fatigue strength of textile reinforced concrete

Title: Experimental investigation of static fatigue strength of textile reinforced concrete
Author(s): S. Ortlepp, F. Jesse
Paper category : conference
Book title: ICTRC'2006 - 1st International RILEM Conference on Textile Reinforced Concrete
Editor(s): J. Hegger, W. Brameshuber and N. Will
Print-ISBN: 2-912143-97-7
e-ISBN: 2351580087
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 131 - 140
Total Pages: 10
Nb references: 10
Language: English

Abstract: Static fatigue strength is a crucial parameter for the design and dimensioning of textile reinforced concrete (TRC) for structural applications. The tension strength of TRC is controlled by the tension strength of the reinforcement. Since textile reinforcements are made of AR-glass fibers and glass is known for showing a pronounced correlation between load and lifetime, information on the static fatigue strength of TRC is of high interest. For estimating the lifetime of TRC, first tests with long-term loading under constant environmental conditions have been conducted. At high load levels the strain rate decreases continuously. Before failure, the strain-rate increases exponentially and finally a sudden failure without notice occurs. At lower load levels, the behavior changes. During constant loading for the duration of up to six months, the specimens did not fail. Residual strength measurements at those specimens sometimes showed increased strength, which contradicts usual ideas. This effect may be explained by internal load redistributions which lead to reduced stresses in highly loaded filaments. Furthermore, the test results showed that a simple creep test is not able to obtain the static fatigue strength of TRC at serviceability limit load levels within available resources, in particular test duration and number of samples. Based on the present state of knowledge of the multitude of mechanisms interacting in TRC during lifetime, extrapolation from short-time periods is common but connected with many uncertainties. Consequently, more efficient test methods must be used.

Online publication: 2006-06-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580087.013