AN INVESTIGATION OF BINDER CONSUMPTION EFFECTS ON CONCRETE HARDENED STATE.

Reference	Presenter	Authors (Institution)	Abstract
04-076	Mayra Tagliaferri de Grazia	Grazia, M.T.(University of Ottawa); Sanchez, L.F.(University of Ottawa); Mesquita, J.A.(University of São Paulo); Romano, R.C.(University of São Paulo); Pileggi, R.G.(University of Sao Paulo);	Concrete is the most important construction material used in civil industry worldwide. Otherwise, it has a huge environmental impact producing about 7% of the global carbon dioxide (CO2). Cement, which is the primary component of concrete is responsible for more than 90% of the total carbon footprint. Given the rapid growth of CO2 emissions and concerns related to global warming, a number of research studies have been focusing on distinct approaches aiming to reduce the environmental impact of cement consumption; among others the use of supplementary cementitious materials (SCMs), the development of more efficient cement production processes, and the improvement of concrete mix-design techniques through the use of particle packing models (PPMs) were performed. Although the first two approaches were proven to be effective, they could not keep up with the rapid annual growth of cement demand. Otherwise, there is currently a lack of literature results on the efficiency of the use of PPM to reduce cement consumption, while maintaining adequate properties in the fresh and hardened states. This work aims to investigate the influence of continuous PPM (i.e. Alfred model) on the fresh (i.e. rheological characterization) and hardened (compressive strength, modulus of elasticity and permeability) behaviours of mixtures designed with one and two distribution factors and presenting low to moderate cement contents (i.e. 150, 200, and 250 kg/m3).
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