Portland blended cements: demolition ceramic waste management

Abstract

Demolition ceramic wastes (DCWs) were investigated in order to determine their potential use as supplementary cementitious materials in Portland Blended Cements (PBCs). For this purpose, three ceramic wastes were investigated. After characterization of the materials used, the effect of ceramic waste replacement (8, 24 and 40% by mass) was analyzed. Pozzolanic activity, hydration progress, workability and compressive strength were determined at 2, 7 and 28 days. The results showed that the ground wastes behave as filler at an early age, but as hydration progresses, the pozzolanic activity of ceramic waste contributes to the strength requirement. RESUMEN:Cementos Portland con adiciones: manejo de residuos cerámicos de demolición. Se estudiaron residuos cerámicos de demolición (DCWs) a fin de determinar su potencial uso como materiales cementicios suplementarios en cementos mezcla (PBC). Para este propósito, se investigaron tres residuos cerámicos. Luego de la caracterización de los materiales a utilizar, se analizó el efecto del reemplazo por residuos cerámico (8, 24 y 40% en peso). Se estudió la actividad puzolánica, el progreso de la hidratación, la trabajabilidad y la resistencia a compresión a 2, 7 y 28 días. Los resultados mostraron que los residuos molidos se comportaron como fillers a edades tempranas, pero con el progreso de la hidratación, la actividad puzolánica de los residuos cerámicos contribuye a los requerimientos de resistencia.

Portlandite consumption by red ceramic waste due to alkali activation reaction

“…For the red ceramic waste, Figure 2 shows the predominance of Illite (I), and small concentrations of Quartz (Q), and Hematite (H). Similar crystalline phases were observed on the industrial ceramic block, mud brick and sanitary ceramic waste evaluated by Trezza et al (2017). It was not possible to find characteristic peaks of 1:1 mullite and cristobalite (crystalline silica), normally formed only at high temperatures, indicating that the heat treatment of the ceramic block did not occur above 1000 °C (CARNEIRO;ANGÉLICA, 2003;FRÍAS et al, 2008;SANTOS et al, 2006).…”

“…The XRD test was performed completely at the curing ages of 3, 7, 28 and 56 days and Figure 5 shows the variation of the intensity of the main peak for the elements: portlandite and hydrated monocarboaluminate over time. The reduction in the intensity of the Portlandite peak, observed in all samples, is related to the consumption of this compound in the alkali-reaction resulting in hydrated compounds formation (ADORNO et al, 2018;TREZZA et al, 2017), although they do not present variations in the diffractograms as a function of the compositions. It can be observed in Figure 5 that the reduction of the Portlandite in compositions C1, C2 and C3 were, respectively, 45%, 47% and 70%.…”

Overview of cement and concrete production in Latin America and the Caribbean with a focus on the goals of reaching carbon neutrality

“…A scrap of the ceramic industry from different ceramic sources (bricks, tiles, sanitary wares, pottery) can be recycled as SCMs based on its pozzolanic activity [83][84][85][86]. More than 50% of construction and demolition waste comprises ceramic materials.…”

The effect of the addition of construction & demolition waste on the properties of clay-based ceramics

“…Substantial research has been carried out regarding the use of C&DW with cements and lime as binding agents [10,11], mortars [12,13] and aggregates [14,15]. Experiments conducted with three ceramic wastes as supplementary cementitious materials in Portland Blended Cements, in quantities of 8, 24 and 40 % by mass, showed that ceramic wastes from the construction and demolition process have pozzolanic activity, and it has been indicated that they should be classified as slow pozzolana [16]. Baroso and Pala [17] investigated the effect of incorporating construction and demolition waste into clay-based ceramic materials and showed that a mixture containing 20 % C&DW had the best chemical and mechanical properties.…”