Abstract

GUTIERREZ GONZALEZ, Mateo; BONILLA SANTOS, Jessika Isabel; CRUZ AMADO, María Fernanda  and  QUINTERO ARANZALEZ, Juan Guillermo. Linear expansion and fiber saturation point of Guadua angustifolia Kunth. Colomb. for. [online]. 2018, vol.21, n.1, pp.69-80. ISSN 0120-0739.  https://doi.org/10.14483/2256201x.11501.

Guadua angustifolia Kunth is a bamboo species, which has been widely used in construction. G. angustifolia is considered a hygroscopic material due to its capacity of absorb water, leading to changes in dimensions, strength, and stiffness due to variation of moisture content. The fibre saturation point (FSP) is reached when at certain moisture content, the material does not present dimensional changes and does not undergo variations in the mechanical strength. Specimens from the upper, middle and upper part of the bamboo were analysed in order to determine the FSP. Two methods were used to determine the FSP; the first method used the dimensional variation of the material at different moisture contents. The results showed that FSP is around 34.05%. The second method allowed verifying the FSP of Guadua angustifolia Kunth from the analysis of the parallel compression strength at different moisture contents. This method found that FSP was around 34%. Finally, a modification factor due to moisture content for compression strength was presented, as well as the equation for linear expansion of the material.

Keywords : moisture content; hygroscopic; fibre saturation point; compression strength; stiffness; dimensional variation..

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