A New Study of the Lower Levels of the Los Frailes Caldera (Spain) for the Location and Characterisation of Pozzolans as Construction Materials

Martín Sanchez, Domingo Alfonso and Costafreda Mustelier, Jorge Luis and Presa Madrigal, Leticia and Zambrano Álvarez, José and Costafreda Velázquez, Jorge Luis (2022). A New Study of the Lower Levels of the Los Frailes Caldera (Spain) for the Location and Characterisation of Pozzolans as Construction Materials. "Construction Materials", v. 2 (n. 1); pp. 40-52. https://doi.org/10.3390/constrmater2010004.

Description

Title: A New Study of the Lower Levels of the Los Frailes Caldera (Spain) for the Location and Characterisation of Pozzolans as Construction Materials
Author/s:
  • Martín Sanchez, Domingo Alfonso
  • Costafreda Mustelier, Jorge Luis
  • Presa Madrigal, Leticia
  • Zambrano Álvarez, José
  • Costafreda Velázquez, Jorge Luis
Item Type: Article
Título de Revista/Publicación: Construction Materials
Date: 25 January 2022
Volume: 2
Subjects:
Freetext Keywords: Pozzolans; zeolitized-bentonitised volcanic tuffs; construction materials; cement; electrical tomography
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: None

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Abstract

Over the last two decades, there was been intensive study of pozzolans on the surface of the Los Frailes Caldera (Spain) for possible use as construction materials; however, research into the deepest underlying horizons has not yet been done. The main object of this paper is to present the results of the research carried out at different levels of depth, down to 30 m, to locate and demonstrate the presence of pozzolans in the depths of the Los Frailes Caldera. To achieve this, a series of analyses were carried out to classify the samples extracted from the various levels of depth, starting at the surface and continuing down to 30 m, which consisted of XRD, XRF, and SEM. Other technological tests were also performed such as chemical analysis of pozzolanic quality (CAQP) and pozzolanicity (PT) tests, at 8 and 15 days. Lastly, a geophysical study using electrical resistivity tomography (ERT) was developed to define the thickness and physical properties of the horizons of pozzolanic materials at depth, as well as to establish the depth of the deposit. The results obtained by XRD, XRF, and SEM confirmed the presence of pozzolans consisting of strongly zeolitized and bentonitised tuffs (ZBVT) in the lower levels of the Los Frailes Caldera, indicating that these horizons continue uninterruptedly beyond 30 m deep. The results of the CAQP and PT established that the ZBVTs that lie in the depths have pozzolanic qualities. On the other hand, the ERT study showed that ZBVT levels continue into the depths, thus proving that the lower limit of the deposit is even deeper. The results obtained in this work could have a positive impact on an increase in the reserves of pozzolanic raw materials in the researched area and could be used in the manufacture of light aggregates for mortars, concretes, and pozzolanic cements, consistent with the environment and effective in reducing CO2 emissions during the production process.

More information

Item ID: 69594
DC Identifier: https://oa.upm.es/69594/
OAI Identifier: oai:oa.upm.es:69594
DOI: 10.3390/constrmater2010004
Official URL: https://www.mdpi.com/2673-7108/2/1/4
Deposited by: Dr. Jorge Luis Costafreda Mustelier
Deposited on: 27 Jan 2022 09:30
Last Modified: 27 Jan 2022 09:30
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