Bamboo Reinforced Concrete Beams for Precast Slab
T.L. Gonçalves, L.E. Moreira
Abstract. The precast slabs are one of the most commonly used elements in Brazilian construction industry. They are made out of pre-fabricated beams which is composed of a steel truss fixed in a rectangular base of concrete, and this way commercialized. These easily produced beams are equally spaced and arranged to make the slabs. Afterwards, the gaps between then will receive fill blocks, which may be made out of Styrofoam, or ceramic. These blocks are permanent forms. Over this system a capping steel mesh is placed and then a concrete layer of 3 to 5 centimeters thick is set. This way the steel apex of the steel truss is merged into the concrete mass leading to the precast slab, a monolithic system easy to manufacture, low weight and high safety level, a plate ribbed by the beams. This paper presents the mechanical tests and the construction techniques that allowed replacing the steel bars by bamboo. The three points bending flexural test were performed in 2 prototypes beams, one of them made of steel and the other made of bamboo. Also characterization tests were run: – concrete compression and bamboo tension. The results were very effective, leading to the possibility of replacement of the steel by bamboo. The replacement of steel bars by bamboo bars on concrete precast slabs means using 2,9 kgf of bamboo instead of 4 kgf of steel in 1 square meter of slab. In 100 m2, 400 kgf of steel could be saved.
Keywords
Bamboo, Reinforced Concrete, Slab, Bending Mechanical Tests, Sustainability
Published online , 10 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: T.L. Gonçalves, L.E. Moreira, ‘Bamboo Reinforced Concrete Beams for Precast Slab’, Materials Research Proceedings, Vol. 7, pp 180-189, 2018
DOI: http://dx.doi.org/10.21741/9781945291838-17
The article was published as article 17 of the book Non-Conventional Materials and Technologies
References
[1] ABN (NBR 7215). Cimento Portland– Determinação da Resistência à compressão, 1996.
[2] ABNT( ISO/DIS 22156) – Projeto de Estruturas de Bambu – Procedimento, 2016.
[3] Ghavami, K. Bamboo as reinforcement in structural concrete elements. Cement& Concrete Composites 27, 637-649. www.sciencedirect.com, 2005. https://doi.org/10.1016/j.cemconcomp.2004.06.002
[4] Navarro, E.H.A. Bambu – Material ¨High Tech¨ como reforço em concreto; PhD thesis; Pontifícia Universidade Católica do Rio de Janeiro, RJ, 2011.
[5] ABNT (NBR 6120). Cargas para o Cálculo de Estruturas de Edificações,1980.
