Fracture characteristics of concrete at early ages

Title: Fracture characteristics of concrete at early ages
Author(s): Y. Lee, J.-K. Kim
Paper category : conference
Book title: International Conference on Advances in Concrete and Structures
Editor(s): Ying-shu Yuan, Surendra P. Shah and Heng-lin Lü
Print-ISBN: 2-912143-41-1
e-ISBN: 2351580176
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 263 - 270
Total Pages: 8
Nb references: 10
Language: English

Abstract: 
The objective of this study is to experimentally investigate the fracture characteristics of concrete at early ages such as critical crack tip opening displacement(CTODc), critical stress intensity factor(KIc), and bilinear softening curve based on the concepts of the effective-elastic crack model and the cohesive crack model. A wedge-splitting test was performed on cubical specimens. For various strengths and ages, load-crack mouth opening displacement curves were obtained and these curves were evaluated by linear elastic fracture mechanics(LEFM) and finite element analysis.The test and analysis show that critical crack tip opening displacement decreases and critical stress intensity factor increases with concrete ages from 1 day to 28 days. By iteration procedure, four parameters of bilinear softening curve from 1 day to 28 days were obtained. It was noted that the parameters ft and f1 increase and the parameters w1 and wc decrease with increasing age. The results of this research can be used as a fracture criteria and an input for finite element analysis of concrete.

Online publication: 2003-08-10
Publication type : full_text
Public price (Euros): 0.00