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Pozzolanic reaction in bamboo added mortar 

Author: Francesca Parotti ; Typology: Tesi di Laurea Magistrale Facoltà di Ingegneria

Licence: CreativeCommons CC BY-NC-ND 3.0 ; Year: 2009; Language: italiano

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Abstract
In this paper the possibility of using bamboo waste as a basis for a natural occurring
pozzolanic admixture have been presented. This consideration stems from the changes in lime mortar put in contact with bamboo fibres.
The bamboo species of choice was Guadua Angustifolia, a giant bamboo that grows up in South America. The union of bamboo and mortar was used for structural applications,
where the mortar was the matrix in a new generation of joints in bamboo structures. The chemical analysis of bamboo revealed the presence of SiO2. This fact has been proved by analysis with S.E.M. and led to the hypothesis that the presence of amorphous SiO2 could drive to the observed pozzolanic properties. Two lime mortars with different hydraulic properties were prepared, one type being cured solely in atmosphere, the other one inside the bamboo culm. Both samples were analyzed with an X-ray diffractometer at different distances from the bamboo surface. Later a bamboo powder has been reduced in ash in a high power oven. Time and temperature of burning have been defined by sequential test to remove organic residues without altering the structure of silica. The dimension and the morphology of Bamboo Waste Ash (BWA) is very similar to the one of C type fly ash. BWA reacts with calcium hydroxide to create CaSiO3, a product of the hydration of cement. Ash has been used both to replace that in addition to mortar to obtain cubic samples. After a minimum of 28 days compression tests were performed and they showed a significant increase in strength of maximum load. In this paper the properties of Guadua Angustifolia, the methods adopted in the preparation of the investigation, the analysis methods and the results obtained are reported
 

 

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