Air permeability of cover concrete quality of precast box culverts affected by casting direction
- 18 Downloads
Casting direction is an external factor that can influence the properties, including air permeability of concrete structures. In the current study, the effect of this factor on the air permeability of precast box culverts was investigated. The Torrent air permeability test was used to measure coefficient of air permeability kT for two box culvert specimens produced using ordinary Portland cement, water-to-binder ratio of 0.485, different casting directions (vertical and horizontal) at the age of 3 months. The obtained results show the different cover concrete qualities between the surfaces of the horizontal casting specimen, whereas the shortcomings during casting process were detected of the vertical casting specimen.
KeywordsCover concrete Air permeability Box culvert Casting direction
Unable to display preview. Download preview PDF.
This study was supported by the All Japan Box-Culvert Association. The authors are grateful to Mr. Hideaki Karasawa, Mr. Yuji Tadokoro and other members of the association for assisting with the specimen preparation in experiments.
- 3.X. Pan, Z. Shi, C. Shi, T.C. Ling, N. Li, A review on surface treatment for concrete–part 2: performance, Constr. Build. Mater., 133, 81-90 (2017).Google Scholar
- 6.M.S. Chin, M.A. Mansur, T.H. Wee, Effects of shape, size, and casting direction of specimens on stress-strain curves of high-strength concrete. Materials Journal, 94(3), 209-219 (1997).Google Scholar
- 7.ACI Committee 238, Report on Measurements of Workability and Rheology of Fresh Concrete, Farmington Hills (2008)Google Scholar
- 12.C. I. Goodier, Skills and training in the UK precast concrete manufacturing sector, (2008).Google Scholar