Cimentos especiais à base de escória granulada de alto forno aditivada por CO2

Abstract

The manufacture of Portland cement requires a temperature of approximately 1450ºC, with high consumption of limestone and clay, added to the aggravation of being responsible for approximately 15% of indirect CO2 emissions. In this sense, the development of cementitious materials with a lower environmental impact becomes necessary. Therefore, this work aimed to produce special cement (EC) based on accelerated carbonation activated blast furnace slag (BFS). For this, an carbonation chamber prototype was developed to perform the BFS accelerated carbonation process. Cylindrical specimens, with a diameter of 5 cm and a height of 10 cm, were prepared and subjected to a 100% CO2 environment. The controlled variables were temperature and activation time by CO2. Compressive strength tests were performed on after the carbonation. As expected results, we seek to determine the optimal temperature, water/slag ratio and accelerated activation time conditions of the BFS that provide the best performance of the compressive strength of the EC.