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Open AccessArticle

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

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Departamento de Ingeniería Civil, Universidad de Alicante, Ap. Correos 99, 03080 Alacant/Alicante, Spain
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Departamento de Ingeniería Civil, Urbanismo y Aeroespacial, Escuela de Arquitectura, Ingeniería y Diseño, Universidad Europea, c/Tajo s/n, 28670 Villaviciosa de Odón, Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Materials 2017, 10(6), 598; https://doi.org/10.3390/ma10060598
Received: 21 April 2017 / Revised: 16 May 2017 / Accepted: 25 May 2017 / Published: 30 May 2017
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. View Full-Text
Keywords: micropiles; sustainability; special geotechnical works; impedance spectroscopy; microstructure; compressive strength; fly ash; ground granulated blast furnace slag; sulphate attack; cement grouts micropiles; sustainability; special geotechnical works; impedance spectroscopy; microstructure; compressive strength; fly ash; ground granulated blast furnace slag; sulphate attack; cement grouts
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MDPI and ACS Style

Ortega, J.M.; Esteban, M.D.; Rodríguez, R.R.; Pastor, J.L.; Ibanco, F.J.; Sánchez, I.; Climent, M.Á. Long-Term Behaviour of Fly Ash and Slag Cement Grouts for Micropiles Exposed to a Sulphate Aggressive Medium. Materials 2017, 10, 598.

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