Microstructural Effects of Sulphate Attack in Sustainable Grouts for Micropiles

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Title: Microstructural Effects of Sulphate Attack in Sustainable Grouts for Micropiles
Authors: Ortega, José Marcos | Esteban Pérez, María Dolores | Rodríguez Escribano, Raúl Rubén | Pastor Navarro, José Luis | Sánchez, Isidro
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 | Special geotechnical works | Impedance spectroscopy | Microstructure | Fly ash | Ground granulated blast furnace slag | Sulphate attack | Cement grouts
Knowledge Area: Ingeniería de la Construcción | Ingeniería del Terreno
Issue Date: 8-Nov-2016
Publisher: MDPI
Citation: Ortega Álvarez JM, Esteban Pérez MD, Rodríguez Escribano RR, Pastor Navarro JL, Sánchez Martín I. Microstructural Effects of Sulphate Attack in Sustainable Grouts for Micropiles. Materials. 2016; 9(11):905. doi:10.3390/ma9110905
Abstract: Nowadays, the use of micropiles has undergone a great development. In general, they are made with cement grout, reinforced with steel tubing. In Spain, these grouts are prepared using OPC, although the standards do not forbid the use of other cements, like sustainable ones. Micropiles are in contact with soils and groundwater, in which the presence of sulphates is common. Their deleterious effects firstly affect to the microstructure. Then, the aim of this research is to study the effects of sulphate attack in the microstructure of micropiles grouts, prepared with OPC, fly ash and slag commercial cements, compared to their behaviour when they are exposed to an optimum hardening condition. The microstructure evolution has been studied with the non-destructive impedance spectroscopy technique, which has never been used for detecting the effects of sulphate attack when slag and fly ash cements are used. Its results have been contrasted with mercury intrusion porosimetry and “Wenner” resistivity ones. The 28-day compressive strength of grouts has been also determined. The results of microstructure characterization techniques are in agreement, although impedance spectroscopy is the most sensitive for following the changes in the porous network of grouts. The results showed that micropiles made using fly ash and slag cements could have a good performance in contact with aggressive sodium sulphate media, even better than OPC ones.
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 and the “Ministerio de Economía y Competitividad” (formerly “Ministerio de Ciencia e Innovación”) of Spain and FEDER through project BIA2011-25721.
URI: http://hdl.handle.net/10045/59871
ISSN: 1996-1944
DOI: 10.3390/ma9110905
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 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/ma9110905
Appears in Collections:INV - DMCIA - Artículos de Revistas
INV - INTERES - Artículos de Revistas

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