Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6724343 | Construction and Building Materials | 2014 | 7 Pages |
Abstract
This paper investigates bughole minimization techniques in self-compacting concrete in a precast concrete plant in Brazil. Specifically, the objective of this study was to improve the final surface appearance of self-compacting concrete precast elements with respect to the presence of bugholes. Bugholes are imperfections that appear on a concrete surface after demoulding. The experimental study was based on the modification of concrete composition and the use of two types of release agents. In particular, ethyl-alcohol and biodegradable-oil-based admixtures were applied on laminated plywood formwork. By using a specific image analysis method, the concrete surface was analyzed using digital images taken from concrete board plates with dimensions of 1.00Â ÃÂ 0.30Â ÃÂ 0.08Â m. The results indicate that a reduction in the concrete shear stress ratio contributed to reduce the percentage of bugholes, whereas no significant difference in the concrete surface appearance was observed as a function of the investigated release agents.
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Authors
W.R.L. da Silva, D.S. Lucena, P. Å temberk, L.R. Jr.,