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% (CSC-I), 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.

Panorama atual dos estudos sobre reaproveitamento de resíduos na construção civil brasileira

“…Ademais, de acordo com os autores 2020), a resistência se relaciona com a porosidade da matriz do material, quanto mais poroso menor será a sua resistência mecânica, situação que ocorre nos materiais estudados. A mesma situação ocorre com o resíduo de louça sanitária, que apresenta diminuição da porosidade e aumento da resistência à compressão (ALMEIDA et al, 2019). O resíduo de gesso também apresenta melhora na resistência à compressão, assim como à flexão, porém uma característica da adição deste material é o aumento da fluidez da argamassa, afetando sua trabalhabilidade (CRUZ et al, 2022).…”

Mechanical Properties and Durability of Sustainable Concrete Manufactured Using Ceramic Waste: A Review

“…According to the microstructure, the improvement in the thickness and modulus of elasticity of the interfacial transition zone (ITZ) between pastes and sanitary ware aggregates explained the increase in concrete strength [79]. Almeida et al [80] found that the 28 d compressive strengths of concrete in which 25%, 50%, 75%, and 100% of the cement had been replaced with sanitary ware coarse aggregates were 3.2%, 7.7%, 5.2%, and 1.4% higher, respectively, than that of the reference concrete. In addition, the use of sanitary ware aggregates did not have a significant impact on the compressive strength of selfconsolidating concrete and high-strength concrete [29,81].…”

Resíduos De Louça Sanitária Como Componentes De Concretos E Argamassas

“…A trabalhabilidade do concreto produzido com até 25% de agregado de RLS não foi significativamente afetada, não sendo necessário o aumento de água na mistura (ALMEIDA et al, 2019;MEDINA et al, 2011MEDINA et al, , 2016a.…”