Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium

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Title: Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium
Authors: Ortega, José Marcos | Esteban Pérez, María Dolores | Rodríguez Escribano, Raúl Rubén | Pastor Navarro, José Luis | Ibanco, Francisco José | Sánchez, Isidro | Climent, Miguel-Ángel
Research Group/s: Durabilidad de Materiales y Construcciones en Ingeniería y Arquitectura | Ingeniería del Terreno y sus Estructuras (InTerEs)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Civil
Keywords: Micropiles | Sustainability | Special geotechnical works | Impedance spectroscopy | Microstructure | Compressive strength | Fly ash | Ground granulated blast furnace slag | Sulphate attack | Cement grouts
Knowledge Area: Ingeniería de la Construcción | Ingeniería del Terreno
Issue Date: 30-May-2017
Publisher: MDPI
Citation: Ortega JM, Esteban MD, Rodríguez RR, Pastor JL, Ibanco FJ, Sánchez I, Climent MÁ. Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium. Materials. 2017; 10(6):598. doi:10.3390/ma10060598
Abstract: Nowadays, one of the most popular ways to get a more sustainable cement industry is using additions as cement replacement. However, there are many civil engineering applications in which the use of sustainable cements is not extended yet, such as special foundations, and particularly micropiles, even though the standards do not restrict the cement type to use. These elements are frequently exposed to the sulphates present in soils. The purpose of this research is to study the effects in the very long-term (until 600 days) of sulphate attack in the microstructure of micropiles grouts, prepared with ordinary Portland cement, fly ash and slag commercial cements, continuing a previous work, in which these effects were studied in the short-term. The microstructure changes have been analysed with the non-destructive impedance spectroscopy technique, mercury intrusion porosimetry and the “Wenner” resistivity test. The mass variation and the compressive strength have also been studied. The impedance spectroscopy has been the most sensitive technique for following the sulphate attack process. Considering the results obtained, micropiles grouts with slag and fly ash, exposed to an aggressive medium with high content of sulphates, have shown good behaviour in the very long-term (600 days) compared to grouts made with OPC.
Sponsor: The fee for publishing this open access paper has been provided by the R&D Center of Excellence in Architecture, Engineering and Design of European University (Spain). The research work included in the paper has been financially supported by the University of Alicante (Spain) through project GRE13-25.
URI: http://hdl.handle.net/10045/66557
ISSN: 1996-1944
DOI: 10.3390/ma10060598
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Peer Review: si
Publisher version: http://dx.doi.org/10.3390/ma10060598
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