Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

Author:

de Oliveira Alencar Ibeiro1,Subhani Mahbube2ORCID,Aramburu Arthur Behenck3ORCID,Rossetto Hebert Luis14,Trindade Guilherme Höehr4ORCID,dos Santos White José5,de Avila Delucis Rafael14ORCID

Affiliation:

1. Postgraduation Program in Materials Science and Engineering, Federal University of Pelotas, Pelotas 96010-610, Brazil

2. School of Engineering, Deakin University, Waurn Ponds, VIC 3217, Australia

3. Postgraduation Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, Porto Alegre 91509-900, Brazil

4. Graduate Program in Civil Engineering, Engineering Center, Federal University of Pelotas, Pelotas 96010-610, Brazil

5. Department of Materials Engineering and Civil Construction, Federal University of Minas Gerais, Belo Horizonte 31270-901, Brazil

Abstract

The pulp and paper industry generates a significant volume of solid waste during its operations. In order to mitigate the environmental impact caused by this industry, one of its residues was applied in eco-friendly composites. Therefore, this research aims to use green liquor dregs as a partial replacement for lime in coating mortars. Hydrated lime was replaced by dregs in percentages of 10%, 15%, 20%, and 30%, and the manufactured mortar specimens were tested in terms of their flowability, air content, and specific gravity in the fresh state. In the hardened state, physical and chemical characterization was carried out to determine the influence of the introduction of the dregs on the properties of the different types of mortar. Mechanical testing of the mortar specimens’ compressive, flexural, and adhesive strengths was carried out, and scanning electron microscopy was performed to evaluate the microstructural features of the cement composites. In general, the types of mortar with dregs showed a high degree of similarity to conventional mortar in all studied aspects, including the 30% replacement group. The obtained SEM images indicated that the presence of dregs in the mortar did not change the formational mechanism of C-S-H crystals, maintaining the mechanical properties of the material even after the accelerated aging procedure was performed, reaching similar levels of flexural, compressive, and tensile bond strengths when compared to the neat mortar. Furthermore, tensile bond levels reached approximately 0.9 MPa for all the studied types of mortar, allowing the material to be used in external applications.

Funder

Coordination for the Improvement of Higher Education—CAPES

National Council for Scientific and Technological Development—CNPq

Publisher

MDPI AG

Subject

Engineering (miscellaneous),Ceramics and Composites

Reference46 articles.

1. Quina, M.J., and Pinheiro, C.T. (2020). Inorganic Waste Generated in Kraft Pulp Mills: The Transition from Landfill to Industrial Applications. Appl. Sci., 10.

2. (2022, September 05). IBÁ Relatório Anual. Available online: https://iba.org/datafiles/publicacoes/relatorios/relatorio-iba-2020.pdf.

3. Caracterização de resíduos sólidos da indústria de celulose tipo kraft visando sua aplicação no desenvolvimento de materiais cerâmicos;Rodrigues;22° CBECiMat Congr. Bras. Eng. Ciência Mater.,2016

4. Technological and environmental comparative of the processing of primary sludge waste from paper industry for mortar;Azevedo;J. Clean. Prod.,2020

5. Formaggio, A.R., Formaggio, R.A., and Sanches, I.D. (2017). Sensoriamento Remoto em Agricultura, Oficina de Textos. [1st ed.].

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