Evaluation of the Influence of PU/EVA Waste-Based Lightweight Aggregates on the Physical Properties of Alkali-Activated Mortars

Abstract:

The objective of this study is to evaluate the effect of the relationship of waste polyurethane (PU) and Ethylene-Vinyl Acetate (EVA), as a replacement for conventional construction sand, on the physical properties of water absorption, bulk density and open porosity of fly ash-based and alkali-activated metakaolin mortars. By means of processing involving extrusion and milling, PU/EVA-based aggregates were prepared in three proportions: 30/70, 50/50 and 70/30. The reference alkali-activated mortars were prepared using a 1:2 (fly ash + metakaolin : conventional construction sand) ratio, by weight. The waste-containing mortars were prepared via partial replacement of construction sand with the PU/EVA waste in percentages of 10%, 20%, 30% and 40%, relative to the volume of sand. The activators used in all mortars were NaOH and Na₂SiO₃. The mortars were cured at 80°C for 21 hours. Based on the procedures of ASTM C 642, the water absorption, open porosity and bulk density of the alkali-activated mortars were determined at the ages of 7, 28 and 91 days. The open porosity and water absorption values ​​increased as the amount of sand replaced with PU/EVA waste increased. The absorption values ​​were found to be in the range from 8.0% to 17.00%. The values ​​obtained for open porosity varied from 20.00% to 29.00%. With regard to bulk density, the behavior was reversed: increasing the amount of sand replaced by waste, decreased the bulk density value. The values ​​ranged between 2.10 and 2.48 kg/dm³. Therefore, based on these results, mortars containing up to 40% PU/EVA have potential for use in the manufacture of non-load-bearing elements for civil construction.

• Periodical: Key Engineering Materials (Volume 634)
• Pages: 278-287
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.634.278
• Online since: December 2014
• Authors: Fabiano André Trein, Alexandre Silva Vargas, Marco Antônio Siqueira Rodrigues, João Paulo Castro Gomes
• Keywords: Alkali-Activated Mortars, Bulk Density, Open Porosity, PU/EVA Lightweight Aggregate, Water Absorption

References

[1] MANSUR, A.A.P., NASCIMENTO, O.L.; MANRIR, H.S. Physicochemical characterization of EVA-modified Mortar and porcelain tiles interfaces Original Research Article Cement and Concrete Research, Volume 39, Issue 12, December 2009, Pages 1199-1208.

DOI: 10.1016/j.cemconres.2009.07.020

[2] MESSAN, A; LENNY, P.; NECTOUX, D. Free and restrained early-age shrinkage of mortar: Influence of glass fiber, cellulose ether and EVA (ethylene-vinyl acetate) Original Research Article Cement and Concrete Composites, Volume 33, Issue 3, March 2011, Pages 402-410.

DOI: 10.1016/j.cemconcomp.2010.10.019

[3] SILVA, D.A., ROMAN, H.R., GLEIZE, P.J.P. Evidences of chemical interaction between EVA and hydrating Portland cement Original Research Article Cement and Concrete Research, Volume 32, Issue 9, September 2002, Pages 1383-1390.

DOI: 10.1016/s0008-8846(02)00805-0

[4] FRAJ, A.B.; KISMI, M.; MOUNANGA, P. Valorization of coarse rigid polyurethane foam waste in lightweight aggregate concrete. Construction and Building Materials, V. 24, 2010; 1069–77.

DOI: 10.1016/j.conbuildmat.2009.11.010

[5] LINDEN, Angela Eloisa. Framework for a system of solid waste management in the footwear industry: contribution to environmental performance. 188 p. Thesis (Master's in Environmental Quality) - Feevale, Novo Hamburgo-RS, (2010).

[6] ROBINSON, L.C., Study on the level of evolution of the footwear industry for the development of environmentally friendly shoes. Thesis (Master's in Environment) – Feevale University Center, Novo Hamburgo, (2009).

[7] TREIN, F.; VARGAS, A.; RODRIGUES, M.; GOMES, J. Evaluation of the Mechanical and Environmental Behavior of Alkali-Activated Mortars Containing PU/EVA-Based Waste Luso-Brazilian Conference on Sustainable Construction Materials CLB-MCS. Guimarães, Portugal. (2014).

DOI: 10.4028/www.scientific.net/kem.634.235

[8] BRAZILIAN ASSOCIATION OF TECHNICAL STANDARDS (ABNT). Regulatory Standard NBR 9935: Aggregates - terminology. Rio de Janeiro, (2011).

[9] BRAZILIAN ASSOCIATION OF TECHNICAL STANDARDS (ABNT). Regulatory Standard NBR 7215: Portland cement – Determination of compressive strength, Rio de Janeiro, (1996).

[10] ASTM C 642 – Standard Test for Density, Absorption, and Voids in Hardened Concrete, West Conshohocken – United States, (2006).

[11] NEVILLE, A. M. Properties of concrete. São Paulo: Pini, 1997. Trad. Salvador E. Giamusso.

[12] BRAZILIAN ASSOCIATION OF TECHNICAL STANDARDS (ABNT). ABNT NBR 15270-1: 2005. Ceramic components Part 1: Hollow ceramic blocks for non-load-bearing masonry - Terminology and requirements. Rio de Janeiro, (2005).

DOI: 10.4028/www.scientific.net/msf.958.35

[13] JUNCO, C.; GADEA, J.; RODRIGUEZ, A.; GUTIÉRREZ-GONZÁLES, S.; CALDERÓN, V. Durability of lightweight masonry mortars made with white recycled polyurethane foam Original Research Article Cement and Concrete Composites, Volume 34, Issue 10, November 2012, Pages 1174-1179.

DOI: 10.1016/j.cemconcomp.2012.07.006

[14] SEVERO, C; COSTA,D.; BEZERRA, I., MENEZES, R.; NEVES, G. Characteristics, particularities and scientific principles of alkaline-activated materials. Revista Eletrônica de Materiais e Processos, V. 8. 2 (2013) 55 –67.

[15] PACHECO-TORGAL, F.; ABDOLLAHNEJADA, A.; CAMÕES, A.; JAMSHIDI, M.; DING, Y. Durability of alkali-activated binders: A clear advantage over Portland cement or an unproven issue? Construction and Building Materials. V. 30 (2012) 400–405.

DOI: 10.1016/j.conbuildmat.2011.12.017

[16] KANI, E.;, ALLAHVERDI, A.; PROVIS, J. Efflorescence control in geopolymer binders based on natural pozzolan. Cement and Concrete Composites. Volume 34, Issue 1, January 2012, Pages 25–3.

DOI: 10.1016/j.cemconcomp.2011.07.007