Preliminary results about mechanism investigation of plastic shrinkage cracking of cement based materials

Title: Preliminary results about mechanism investigation of plastic shrinkage cracking of cement based materials
Author(s): J. Liu, Q. Tian, C. Miao, M. Tang
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: 1491 - 1500
Total Pages: 10
Nb references: 12
Language: English

Abstract: It is well known that fresh concrete may be susceptible to plastic shrinkage cracking. Such kinds of cracks may not endanger the present service ability of concrete structure but significantly impact its durability. There has been a great efforts devoted to this topic but the behind mechanism is still far beyond understanding. In this paper, a modified restrained slab test was developed which provided both base central restraint and around restraint. A minitensiometer was introduced and then the pore pressure (both at surface and bottom layer) could be monitored continuously till crack observed. The crack patterns, crack initiation time were compared. Combining with high resolution laser displacement transducer the settlement and the water evaporation was continuously monitored. The tensile strength of the surface layer at crack initiation was measured. Four kinds of slurries were designed to investigate the particle size, particle space and cement hydration on plastic shrinkage cracking. The preliminary comparative results provide possible quantitative explanations of the mechanism for plastic shrinkage cracking of cement based materials.

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