Evaluation of mechanical properties of grouts substituting the natural coarse aggregate for ceramic civil construction waste

Hinoel Zamis Ehrenbring,Bernardo Fonseca Tutikian,Diego Logue Do Espirito Santo,Bianca Carlin Cadore,Maira Janaina Ott

doi:10.1590/s1517-707620200001.0878

Hinoel Zamis Ehrenbring, Bernardo Fonseca Tutikian + Show 3 more

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https://doi.org/10.1590/s1517-707620200001.0878

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Abstract

ABSTRACT The lack of control regarding waste generation is a problem still faced by the construction industry, whereas its inputs could be used in the production of new cementitious composites, maintaining the quality, performance and sustainability of structures. This study developed grouts through the substitution of natural aggregate for residues of crushed ceramic bricks, evaluating its fresh state and mechanical properties. The samples displayed loss of workability and initial slump in fresh state, besides loss of compressive strength, elastic modulus, total water absorption and capillary water absorption in hardened state. In addition, composites with grog presented less consistency in fresh state when compared to the reference sample. The differences were even greater over time. As for the hardened state, the compressive strength of the samples was similaramong them at both ages, and all results remained above 14 MPa at 28 days, as required by ASTM C476, hence being characterized as structural grouts for masonry. For the elastic modulus test, the results were higher for samples with lower amounts of waste due to less internal voids and higher volume of natural aggregates. The substitution of natural aggregate for civil construction waste (CCW) in the mixtures increased void ratio and water absorption, while causing the lowest specific gravities of the research. Overall, the sample that presented the most satisfactory values was CCW 25%, showing that it is possible to obtain benefits from waste produced in factories and buildings, even for higher replacement levels, occasionally

Highlights

RESUMO A falta de controle com relação à geração de resíduos é um problema ainda enfrentado pela indústria da construção civil, enquanto seus coprodutos podem reutilizados na produção de novos compósitos cimentícios, mantendo a qualidade, o desempenho e a sustentabilidade das estruturas
The compressive strength and elastic modulus of samples with construction waste (CCW) were impaired, despite every mixture presenting results that were satisfactory with regards to compressive strength, with results close to each other at 28 days and above the limits of ABNT NBR 15961-2 [19];
The smallest slump losses were yielded by CCW 25%, which turned out to be similar to REF up to 90 minutes of testing

Summary

Introduction

RESUMO A falta de controle com relação à geração de resíduos é um problema ainda enfrentado pela indústria da construção civil, enquanto seus coprodutos podem reutilizados na produção de novos compósitos cimentícios, mantendo a qualidade, o desempenho e a sustentabilidade das estruturas. Civil construction industry is known for being one of the greatest consumers of natural resources and generators of solid waste, and how does it expose Santos et al [1], considering a disposal of materials between 20 to 50% of the total acquired. Most of these materials are not disposed correctly, namely without focusing on recycling and sustainability, regardless of the intensity of environmental regulations. This material shows good results in researches, depicting the potential of the material inherent to these cementitious matrices for González et al [10]

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