Properties of concrete manufactured with use of ceramic sanitary ware waste as aggregate

Abstract

In concrete manufacture, cement (Portland type is the most used), water and aggregates (classified into
coarse and fine) are used. With the use of several raw materials the generation of waste is inevitable, both in
construction and in other sectors, such as the industries producing ceramic materials. Among the types of
waste from such industries, can be mentioned the ceramic scrap (from the sanitary ware industry). According
to the above, the aim of this research was to study the addition of ceramic scrap as a coarse aggregate in different
proportions in the concrete formulation. In order to do this, was select wastes from an industry in the
south of Minas Gerais (Brazil), and prepare specimens to determine the fresh (slump test, adhesiveness and
porosity) and hardened (compression strength) of concrete. Were fabricated five concrete formulations, one
reference (RC) and four with ceramic scrap substituted for coarse aggregate in the proportions of 25% (CSCI),
50% (CSC-II), 75% (CSC-III) and 100% (CSC -IV). Fresh concretes, two formulations did not show adhesiveness
(CSC-III and CSC-IV) and two a small water runoff (CSC-I and CSC-II), however, without compromising
the concrete’s workability. Regarding the compression strength, the average values presented were
very good, including the formulation with 100% ceramic scrap (fc = 47.78 MPa). Another important aspect
observed in the rupture modes was the small adhesion between the ceramic scrap and the mortar due to the
glazing in the contour of the waste. As for the porosity of the concretes, those with 25%, 75% and 100% of
ceramic scrap in their composition presented lower values than the reference concrete.
Keywords: Ceramic scrap; Concrete; Waste; Mechanical properties.