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Appl. Sci. 2017, 7(10), 1090; https://doi.org/10.3390/app7101090

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

1
Post-Graduation Program in Civil Engineering (PPGEC), Department of Civil Engineering, Polytechnic School, Meridional College (IMED), Passo Fundo, Rio Grande do Sul 99070-220, Brazil
2
Laboratory of Mineral Processing (LAPROM), Post-Graduation Program in Mining, Metallurgical and Materials Engineering (PPGE3M), Department of Engineering, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul 90130-120, Brazil
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 14 October 2017 / Accepted: 18 October 2017 / Published: 21 October 2017
(This article belongs to the Section Materials)
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Abstract

The main objective of this study was to evaluate the use of construction and demolition waste (CDW) from the Passo Fundo region of Rio Grande do Sul (RS), Brazil, in the development of aerated foamed concrete. This waste had not yet been characterized or even reused. CDW was processed (sieved only), characterized, and used as an aggregate, completely substituting natural sand. The influence of CDW granulometry and the amount of foam upon compressive strength, wet and dry bulk density, water absorption, and the air voids of concrete blocks were determined. Results showed that CDW has regular characteristics for the development of aerated foamed concrete. Compressive strength and density decreased as the amount of foam increased, while water absorption and air voids also increased. Also, CDW that was classified as coarse showed higher compressive strength. On average, CDW medium-sized particles had a higher air void content, while water absorption showed little variation with respect to granulometry. CDW residue from the region of study can be used as aggregate for the development of aerated foamed concrete. However, it must characterized before being used to guarantee the quality of the final product. View Full-Text
Keywords: construction and demolition waste—CDW; foamed concrete; compressive strength; pore structure; density construction and demolition waste—CDW; foamed concrete; compressive strength; pore structure; density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Favaretto, P.; Hidalgo, G.E.N.; Sampaio, C.H.; Silva, R.A.; Lermen, R.T. Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks. Appl. Sci. 2017, 7, 1090.

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