Utilização de cinzas debagaço da cana-de-açúcar e madeira de eucalipto para produção de bloco de concreto

Abstract

The intense population growth with the increase in the availability of real estate credit in recent years, led to the expansion of the civil construction sector, increasing the demand for products and inputs to support this demand and mainly reducing the final costs of the sector's production chain. With this increase in demand, the development of new technologies and products for construction systems was required, especially with lower production costs and with low impacts on the environment. This work evaluated the partial replacement of cement for the production of concrete blocks (structural and closure) using sugarcane bagasse ash (SBA) originating from the sugar and alcohol plant and eucalyptus wood ash (EWA) originating from the cellulose. 10%, 15% and 20% of Portland cement were replaced by SBA and EWA. The results showed that although there was a reduction in strength in the final product, the replacement of 10, 15 and 20% of EWA and 10 and 15% of SBA did not significantly change the compressive strength indexes, maintaining the classification of the products as Class B. However, the replacement of 20% of cement by SBA significantly reduced the compressive strength by classifying the final product as Class C but it can still be used as structural as some restriction. Although the ashes needed pretreatment and had an extra cost of treatment and logistics, the production costs using the SBA and EWA ashes were lower when compared to using only cement. Environmental viabilitywasalso positive, as the use of ashes for the manufacture of blocks reduced the disposal of this waste in landfills, reducing environmental liabilities and theirrespectiveimpactsontheenvironment.