INCORPORATION OF FINE FRACTION OF THE CIVIL CONSTRUCTION WASTE (FCCW) TO PRODUCE ALKALI-ACTIVATED CEMENT-BASED BINDER AND MORTARS

Reference	Presenter	Authors (Institution)	Abstract
04-037	Nilson Santana de Amorim Júnior	Amorim Júnior, N.S.(Federal University of Bahia); Andrade Neto, J.d.(Federal University of Bahia); Cilla, M.S.(Universidade Federal da Bahia); RIBEIRO, D.V.(Federal University of Bahia);	The production of Portland cement, the most man-made material, presents an inefficient ecological footprint, with a high consumption of raw materials and energy, and a high CO2 emission. Based on this, several studies are seeking alternative materials, with less environmental impact compared to Ordinary Portland Cement (OPC), such as alkali-activated cement-based binders (AACB), also called geopolymers, mineral polymers, inorganic polymers, inorganic polymer glasses, alkali-bonded ceramics, alkali ash material, soil cements, hydroceramics, zeocements, zeoceramics, among others. These cements, with lower CO2 emissions in their production, use aluminosilicate-rich raw materials, such as Civil Construction Wastes (CCW) decreasing the environmental impact. Therefore, the present work focuses on the use of the fine fraction of the CCW (FCCW) as a substitution to metakaolin at the levels of 0.0, 25.0 and 50.0 wt.% to produce AACB to the OPC replacement. Samples produced were characterized for flexural tensile strength, axial compression strength, water absorption by capillarity, apparent density and porosity. The substitution of metakaolin by FCCW led to a reduction in the mechanical performance of the produced mortars, which could be explained by the lower reactivity of the material. However, it has been observed that FCCW has the potential to be used as precursor material to produce low mechanical strength binders, such as coating mortars, but further testing is required to prove its technical feasibility.
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