Avaliação da substituição do agregado miúdo pelas cinzas do bagaço da cana-de-açúcar em argamassas

Abstract

The residual ashes from the sugarcane bagasse, produced through the burning of the bagasse in boilers, by the process of generating energy, are generally used for fertilizing crops, even though it does not have properties for this purpose, or then discarded in the environment of inadequate form. From this, studies in the area of technologies of the civil construction are being carried out, verifying the substitution of raw materials, such as cement and aggregates, by urban and agroindustrial waste. Thus, the present work was carried out with the objective of evaluating the use of sugarcane bagasse ash as a partial substitute for fine aggregate in the production of mortars, with the respective levels of substitution of 0%, 10%, 20% and 30% of CBC. Initially, the sand and CBC materials were physically characterized so that the molding of the specimens could be performed according to the traces elaborated for each content. After that the assays of absorption of water and axial compressive strength of the mortar had been carried through, where the results had indicated an increase of the water absorption, and a reduction of the resistance in relation to the sample of reference. It was then concluded that the amount of water added during the preparation of the mixture had a significant influence on the final results.