Durability of Sustainable Ceramics Produced by Alkaline Activation of Clay Brick Residue

Fabiana Pereira Da Costa,Izabelle Marie Trindade Bezerra,Gelmires De Araújo Neves,Jucielle Veras Fernandes,Alisson Mendes Rodrigues,Romualdo Rodrigues Menezes

doi:10.3390/su131910931

Fabiana Pereira Da Costa, Izabelle Marie Trindade Bezerra + Show 4 more

Open Access

https://doi.org/10.3390/su131910931

Copy DOI

Journal: Sustainability	Publication Date: Oct 1, 2021
Citations: 6	License type: CC BY 4.0

Affiliation: Universidade Federal de Campina Grande

Abstract

Alkali-activated materials (AAMs) were produced using residues from the red ceramic industry as a precursor, and sodium hydroxide (NaOH), potassium hydroxide (KOH), and sodium silicate (Na2SiO3) as alkaline activators. The effect of activators and curing conditions on physical-mechanical properties and durability were evaluated. The processing parameters (amount of water and consistency index) and the activation conditions (the activator contents and curing temperature) were defined based on an experimental design getting the flexural rupture module as the response. The durability behavior was evaluated by natural aging, accelerated aging (simulated rain test), exposure to the marine environment (salt fog), and acidic environments (HCl and H2SO4). The results showed that the NaOH- and KOH-activated samples exhibited inferior mechanical behavior than those activated with Na2SiO3. In the durability studies, due to leaching, there was a decrease in mechanical strength when samples are subjected to aggressive exposure conditions. However, the strength values are still higher than the minimum indicated for traditional ceramic applications.

Highlights

The red ceramic industry is an important economic segment of the global production chain and generates several jobs
The results showed that the ceramic residues showed high pozzolanic reactivity and are rich in silica and alumina, which are fundamental for synthesizing activated materials (AAMs)
RCR formulations contained in this region have higher amounts of #80 and According to the results of the experimental design carried out for the amount of water and the consistency index, the Z composition (40% of #40, 2.5% of #80, and 57.5 of #200) was chosen to evaluate under which cure temperatures and alkaline activators concentrations obtained the best flexural strength values

Summary

Introduction

The red ceramic industry is an important economic segment of the global production chain and generates several jobs. The residues of the red ceramic industry have several potentials for reuse; among them stand out the production of traditional ceramics or cementitious materials [7,8,9,10]. Alkali-activated materials (AAMs) have attracted worldwide attention for their low CO2 emissions and excellent mechanical and durability properties. These materials are formed from reactive aluminosilicate raw materials that, in an alkaline medium, undergo a series of chemical reactions giving rise to alkaline aluminosilicate gels with cementitious properties [12]

Objectives

Methods

Results

Conclusion