Redução do impacto ambiental com o emprego de adições minerais no concreto

Abstract

The subject to be developed in this monograph involves topics as sustainability, eco-efficiency and environmental pollution that concern the scientific community and population in general. Besides inciting research and development of clean technologies, aiming in reducing or eliminating adverse impacts to the environment and to the health of community, was developed a research work that could be used by interested elements as a way of warning society to the reduction of environmental damages caused by the improper disposal of fly ash, rice husk ash and slag by employing these mineral additions on the civil construction. The Portland concrete cement is a largely used material on the constructions engineering due to its versatility. It is, also, the repository that possesses the greater potentiality to incorporate mineral additions, with the corresponding reduction of clinquer consumption. The largest is the proportion of additions to the concrete, the bigger are the social benefits achieved. The use of fly ash, rice husk ash and slag, in replacement of Portland cement, seeks the balance of ecology and economy, having as a purpose to produce concrete with less energy, raw material, waste and pollution, aiming eco-efficiency and sustainability of the structures, besides recycling and/or reusing industrial sub-products. The viability of employing high quantities of pozzuolana in structural concrete using an adequate technology will allow the slag, the fly ash and the rice husk ash, polluting residues with great occurrence in Rio Grande do Sul and Santa Catarina, instead of causing unbalance to the environment, be used into many purposes, as an example, in replacement to the cement part in concrete structures.