Apuama

Cement Composite with Partial Sand Replacement by Eggshell Particles

O Brasil é um dos maiores produtores agrícolas, gerando um grande volume de resíduos após o processamento das matérias-primas. No setor avícola, são geradas quantidades significativas de casca de ovo, basicamente constituída de carbonato de cálcio. No presente artigo, buscou-se a aplicação de tais resíduos em argamassa de cimento Portland e areia.

Abstract

agro-industrial activities generate a large amount of wastes. According to their specific properties, most of them can partially replace mineral aggregates, aiming to produce non-structural cement composites. In this research work, the behavior of a Portland cement mortar with partial replacement of sand by treated eggshell particles (0% to 66%) has been evaluated. Firstly, chemical compatibility between eggshell particles and Portland cement was carried by hydration curves. In a second step, a mixture of cement mortar based on treated eggshell (cold water, warm water and oven-dry) was prepared. Composite hardening was monitored by an ultrasound technique. At initial ages, ultrasonic pulse velocity (UPV) along the time was sensitivity enough to detect the sand-to-e sggshell ratio effect. Compressive strength at 28 days ranged from 23 to 9 MPa depending on sand to eggshell particles ratio, which indicated that the composite was suitable for non-bearing sructures, mainly at rural areas.

Keywords

Non-conventional materials, NDE, ultrasound, hydration Curve, agricultural waste

Author

Beraldo, A. L.

 

Received 16 July 2014; revised 15 August 2014; accepted 15 September 2014 Copyright © 2014 by author and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY).

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Antonio

Licenciado em Matemática (USP-1974), Engenheiro Agrícola (UNICAMP, 1980), Docteur en Sciences du Bois (ENSTIB, Nancy, France, 1994) - o autor possui enorme admiração pela "Dádiva dos Deuses" - o Bambu. Co-autor do livro "Bambu de Corpo e Alma", agora em segunda edição, e administrador do site www.apuama.org, projeto pessoal desenvolvido desde 2009.

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