No abstract

Bamboo constitutes a family of plants that are very promising and interesting as renewable materials for both large and small structure construction. To be used as an alternative to traditional materials; the understanding of its morphology and mechanical behavior is of crucial importance. As the distribution of fibers and vascular bundles differs for each type of bamboo; several bamboo types have been characterized: Phyllostachys aurea (PA), Arundinaria amabilis (AA) and Dendrocalamus strictus (DS). Morphological analysis has been performed by optical (OM) and scanning electron microscopy (SEM). Differences in density; surface morphology and wall thickness have been found. In fact; PA and AA have shown a great morphological regularity; while DS presents the greatest thickness; to the point that it can be considered full culm. The plant’s own ducts constitute a very important factor for future impregnations and the optimization of mechanical properties for structure construction.

Banbuak, geometria tubularra duen landarea, eraikuntzaren sektorerako material sintetiko tradizionalen ordezko aukera interesgarriak aurkezten ditu. Gainera, ingurumenarekiko iraunkorra eta berriztagarria da. Hala ere, bere erabilera sustatzeko banbuen propietate mekanikoak eta kimikoak ezagutzea beharrezkoa da. Lan honek, gaur egun eraikuntzan ezezagunak diren baino tradizionalki oso erabiliak izan diren hiru espezie, kimikoki eta mekanikoki aztertzen du: Phyllostachys aurea (PA), Arundinaria amabilis (AA) and Dendrocalamus strictus (DS). Azterketa kimikorako TAPPI arauak erabili dira, eta ezaugarri mekanikoak konpresioan eta dinamometroarekin makurdura hiru puntutan neurtuta aztertu dira. Propietate mekanikoen emaitzek erakutsi dute banbuaren dentsitateak eragin zuzena duela, bai erresistentzia, baita zurruntasun ikuspuntutik ere. Aztertutako hiru banbu espezieetan, dentsitatea zenbat eta handiagoa izan, erresistentzia eta zurruntasuna handiagoa dela ikusi da.

The cooperative O-H•••O-H interactions in crystalline CHL reveal its actual conformation.Melting involves the reversal of the intramolecular hydrogen bonds.The Conformation of Chloramphenicol in the ordered and disordered phases.

Bamboo is a material with good tensile and flexural resistance. As a construction material with structural capacity, using bamboo implies considerable environmental advantages in relation to other typical materials such as steel or concrete. For its correct implementation, it is necessary to define its mechanical properties and durability. Bamboo is susceptible to degradation due to the lack of natural toxins and thin walls, which means that shallow decomposition processes can imply appreciable reductions in its mechanical capacity. The main degrading agents considered in this study were beetles, termites, and xylophagous fungi. The aim of this study was to analyze the durability of three different species: DS, PA, and AA. Durability and mechanical tests results after 6 months of exposure to biotic and abiotic agents were compared with their original properties and chemical composition. In this study, durability was analyzed in two ways. Firstly, the loss of mass due to fungal infection was investigated. The results obtained were based on the standard EN 113 using the fungus CP. Secondly, bending and compressive strength was evaluated after a durability test according to the standard EN 335:2013 for the CU3.1 use class after a 6 month period in the city of Donostia/San Sebastian, Spain. The DS and AA varieties were rated as very durable CD1, while the PA variety is durable CD2, thus proving to be an attractive material for construction.