Optimizing Material Properties by Means of the Instrumented Ring Test

Title: Optimizing Material Properties by Means of the Instrumented Ring Test
Author(s): Folker H. Wittmann, Kai Furtwängler, Xinqi Mao
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: 115 - 124
Total Pages: 10
Nb references: 9
Language: English

Abstract: Shrinkage is one of the major origins for crack formation in reinforced concrete structures. Shrinkage cracks often reduce service-life of reinforced concrete structures considerably. Under usual climatic conditions shrinkage strain overcomes the ultimate strain capacity of normal concrete. Adding high performance polymer fibres is an efficient way to increase ductility of cement-based materials including concrete. In order to optimise material properties with respect to shrinkage cracking different mortars have been tested. For each type of mortar characteristic properties such as strength, elastic modulus, fracture energy, and strain hardening have been determined experimentally. In addition the stress evolution in an instrumented ring test has been determined as function of drying time. The resulting crack width has also been measured. Results will be presented and discussed. It will be shown that micro-crack formation can be limited in ECC to such an extent that durability will essentially not be affected. This is in contrast to crack formation in normal concrete.

Online publication: 2005-05-15
Classification: Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143942.013