Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Costafreda Mustelier, Jorge Luis and Martín Sánchez, Domingo Alfonso and Presa Madrigal, Leticia and Parra y Alfaro, José Luis (2021). Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties. "Molecules/Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties", v. 26 (n. 17); ISSN 1420-3049. https://doi.org/10.3390/molecules26175348.

Description

Title: Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties
Author/s:
  • Costafreda Mustelier, Jorge Luis
  • Martín Sánchez, Domingo Alfonso
  • Presa Madrigal, Leticia
  • Parra y Alfaro, José Luis
Item Type: Article
Título de Revista/Publicación: Molecules/Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties
Date: 2 September 2021
ISSN: 1420-3049
Volume: 26
Subjects:
Freetext Keywords: Altered volcanic tuff; pozzolanicity; mortar; cement; mechanical strength
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: None

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Abstract

This work presents the results of the study of the physical, chemical, mineralogical and pozzolanic properties of the altered volcanic tuffs (AVT) that lie in the Los Frailes caldera, south of the Iberian Peninsula, and demonstrates their qualities as pozzolans for the manufacturing of mortars and pozzolanic cements of high mechanical strength. The main objective of this research is to show to what extent the AVTs can replace portland cement (PC) in mortars, with standardised proportions of 75:25% and 70:30% (PC-AVT). To achieve these objectives, three AVT samples were studied by a petrographic analysis of thin section (PATS), DRX, FRX and MEB. The pozzolanic properties were determined by three methods: electrical conductivity (ECT), chemical pozzolanicity tests (CPT) at 8 and 15 days and mechanical strength tests (MS) of the specimens at 2, 7, 28 and 90 days. Studies of a PATS, DRX, FRX and MEB showed that the AVT samples’ constitutions are complex where smectite (montmorillonite), mordenite, quartz, halloysite, illite, kaolinite, volcanic glass and lithic fragments coexist. The results of the ECT and CPT tests confirmed the pozzolanic properties of the samples analysed and proved an increase in mechanical strength from 2 to 90 days of testing.

More information

Item ID: 69427
DC Identifier: https://oa.upm.es/69427/
OAI Identifier: oai:oa.upm.es:69427
DOI: 10.3390/molecules26175348
Official URL: https://www.mdpi.com/1420-3049/26/17/5348#
Deposited by: Dr. Jorge Luis Costafreda Mustelier
Deposited on: 13 Jan 2022 07:06
Last Modified: 13 Jan 2022 07:06
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