Corrosion Behavior of Steel Reinforcement in Concrete with Recycled Aggregates, Fly Ash and Spent Cracking Catalyst

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Title: Corrosion Behavior of Steel Reinforcement in Concrete with Recycled Aggregates, Fly Ash and Spent Cracking Catalyst
Authors: Gurdián Curran, Flora Hebé | García Alcocel, Eva María | Baeza Brotons, Francisco | Garcés, Pedro | Zornoza, Emilio
Research Group/s: Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura | Tecnología de Materiales y Territorio (TECMATER) | Ingeniería del Terreno y sus Estructuras (InTerEs) | Espectroscopía Atómica-Masas y Química Analítica en Condiciones Extremas
Center, Department or Service: Universidad de Alicante. Departamento de Construcciones Arquitectónicas | Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Recycled aggregate | Spent catalytic cracking catalyst | Fly ash | Concrete | Corrosion | Mechanical properties
Knowledge Area: Construcciones Arquitectónicas | Ingeniería de la Construcción
Issue Date: 21-Apr-2014
Publisher: MDPI
Citation: Materials. 2014; 7(4):3176-3197. doi:10.3390/ma7043176
Abstract: The main strategy to reduce the environmental impact of the concrete industry is to reuse the waste materials. This research has considered the combination of cement replacement by industrial by-products, and natural coarse aggregate substitution by recycled aggregate. The aim is to evaluate the behavior of concretes with a reduced impact on the environment by replacing a 50% of cement by industrial by-products (15% of spent fluid catalytic cracking catalyst and 35% of fly ash) and a 100% of natural coarse aggregate by recycled aggregate. The concretes prepared according to these considerations have been tested in terms of mechanical strengths and the protection offered against steel reinforcement corrosion under carbonation attack and chloride-contaminated environments. The proposed concrete combinations reduced the mechanical performance of concretes in terms of elastic modulus, compressive strength, and flexural strength. In addition, an increase in open porosity due to the presence of recycled aggregate was observed, which is coherent with the changes observed in mechanical tests. Regarding corrosion tests, no significant differences were observed in the case of the resistance of these types of concretes under a natural chloride attack. In the case of carbonation attack, although all concretes did not stand the highly aggressive conditions, those concretes with cement replacement behaved worse than Portland cement concretes.
Sponsor: Authors thank to University of Alicante and Generalitat Valenciana the financial support given to this research through projects GRE11-27 and GV/2013/021.
URI: http://hdl.handle.net/10045/36811
ISSN: 1996-1944
DOI: 10.3390/ma7043176
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Peer Review: si
Publisher version: http://dx.doi.org/10.3390/ma7043176
Appears in Collections:INV - DMCIA - Artículos de Revistas
INV - TECMATER - Artículos de Revistas
INV - INTERES - Artículos de Revistas
INV - SP-BG - Artículos de Revistas

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