Study on material property of young concrete and control of cracks in concrete slabs

Title: Study on material property of young concrete and control of cracks in concrete slabs
Author(s): C. Li, X. Gu, F. Lin, L. Yang, H. Qu
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 725 - 733
Total Pages: 9
Nb references: 9
Language: English

Abstract: Cracking of concrete is a complex process closely related to material properties at early age, and cracks may reduce the service life of concrete structures. To prevent and control the unexpected cracks, the technique of control joints set in concrete slabs was studied in this project. Firstly, experimental study on the material properties of two kinds of concrete with different mix proportions was performed, focusing on free shrinkage, split tensile strength, elastic modulus, and stress-strain relationship of concrete under uniaxial compression. The concrete ages were from two days to half a year. As a result, the time-dependent laws of these material properties were derived by means of aggressive analysis. Moreover, based on the results of material properties, experimental study and numerical simulation on control joints in concrete slabs were conducted. Sixteen reinforced concrete slabs with different control joints and other two without joints were cast in pre-formed steel moulds. The tests lasted for a half year. Initiation and development of cracks in slabs were recoded and then numerically simulated. It was shown that cracks in young concrete slabs could be effectively controlled by means of properly setting the control joints.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00