A Correlation Between Soluble and Insoluble Fiber With the Elastic Modulus in Four Varieties of Bamboo
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A CORRELATION BETWEEN SOLUBLE AND INSOLUBLE FIBER WITH THE ELASTIC MODULUS IN FOUR VARIETIES OF BAMBOO L. A. Sanchez-Echeverri1, M. Contreras-Padilla2, M. E. Rodriguez-García1 1 Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, Qro 76230, México. 2 Universidad Autónoma de Querétaro – Facultad de Ingeniería, Cerro de las campanas s/n, Querétaro, Qro 76010, México.
ABSTRACT The fraction of soluble and insoluble fiber was determinate by AOAC International official method for dietary fiber in four varieties of Bamboo called Guadua Angustifolia Kunth. The elastic modulus of the four bamboo varieties was determined using an universal machine INSTROM 4401 based on the ASTM standard method D-143. Finally, the fiber content and the mechanical behavior were correlated using the Pearson coefficient calculated by statistical package STATGRAPHICS 5.1 The fiber content is the main factor responsible for the bamboo mechanical properties. The results show that the all fiber content into the bamboo culms is related with the mechanical behavior. These results confirm that the Guadua Bamboo is a natural composite material with aligned fibers embedded in a matrix formed by soluble fiber.
INTRODUCTION Bamboo is a plant that grows naturally in all continents except in Europe, but major species are in Asia Pacific and South America and is a source for the economic sustenance in these countries [1-2-3]. The bamboo has many applications and has been considered as a natural composite material for different authors [1-4]. Like all composite materials, bamboo has two phases: a matrix compound of hemicellulose classified as soluble fiber and another phase compound by cellulose classified as insoluble fiber, and aligned in the longitudinal direction. The bamboo structure has permitted its use in different applications from biomass to ethanol production until reinforcement for composites to improve mechanical properties [5-6-7]. On the other hand, bamboo also plays an essential role in the daily life of millions of people in subtropical and tropical regions in some countries has include it in their diets. Even in some countries as Japan, bamboo has become an important natural material, and it is widely used for different purposes, such as construction, food, among others. An important feature of bamboo is its high young modulus, which gives high resistance allowing its applications as a structural material in the construction industry. In the present study, the fiber content and mechanical response were measured in four varieties of Bamboo Guadua Angustifolia Kunth, and then these results were correlated to obtain information about the effect of the fiber content on the mechanical properties.
EXPERIMENT DETAILS Bamboo samples were obtained from an experimental field located in Armenia, Quindío (Central region of Colombia) located at 1800 meters above sea level. Four types of Guadua Angustifolia Kunth classified by Macana, Castilla, Rayada Amarilla and Cebolla were used in this study. The main difference between these
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