Stress-carbonation of fly ash concrete

Title: Stress-carbonation of fly ash concrete
Author(s): Y. Zhang, W. Sun, S. Chen, F. Guo
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: 583 - 592
Total Pages: 10
Nb references: 13
Language: English

Abstract: In this paper, a preloading frame is firstly designed to accurately apply external flexural stress to concrete specimens. Then a method that is used to measure one and two dimensional (1D and 2D) carbonation depth of concrete under flexural stress is developed. Using this method and preloading frame, 1D and 2D stress-carbonation depth at different carbonation ages is systematically investigated for fly ash concretes made with different fly ash content (0%, 10%, 20%, 40%, 60%), types of fly ash (grade I, grade II), water to binder ratios (0.3, 0.35, 0.4), amount of binders (458kg/m3, 380kg/m3), curing ages (28d, 90d). The stress accelerating effect on 1D and 2D carbonation is also quantitatively analyzed through a comparison between stress carbonation and non-stress carbonation. Finally, the process of the initiation, prorogation and distribution of microcracks on the tensile face of specimen is in-situ observed by using small-sized loading frame and Scanning Electron Microscope (SEM). The above research provide an insight into carbonation attack on the edge reinforcing bars of concrete structures under flexural stress, such as large-span beam and board in the field of civil engineering.

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