Natural Fluorite from Órgiva Deposit (Spain). A Study of Its Pozzolanic and Mechanical Properties

This work presents the results of the partial substitution of Portland cement (PC) by natural fluorite (NF) and calcined fluorite (CF) in mortars, at 10%, 25% and 40%. To meet these objectives, a sample of fluorite was initially studied by XRD, SEM and Raman Spectroscopy (RS). A chemical quality ana...

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Bibliographic Details
Published in:Crystals (Basel) 2021-11, Vol.11 (11), p.1367
Main Authors: Martín, Domingo A., Costafreda, Jorge Luis, Estévez, Esteban, Presa, Leticia, Calvo, Alicia, Castedo, Ricardo, Sanjuán, Miguel Ángel, Parra, José Luis, Navarro, Rafael
Format: Article
Language:English
Subjects:
Cement
Compressive strength
Energy costs
Fluorite
Graphite
Laboratories
Mechanical properties
mechanical strength
Mineralogy
mortar
Mortars (material)
Portland cements
pozzolan
Raman spectroscopy
reduction of CO2 emissions
Scanning electron microscopy
Spectrum analysis
X-ray diffraction
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Summary:This work presents the results of the partial substitution of Portland cement (PC) by natural fluorite (NF) and calcined fluorite (CF) in mortars, at 10%, 25% and 40%. To meet these objectives, a sample of fluorite was initially studied by XRD, SEM and Raman Spectroscopy (RS). A chemical quality analysis (CQA) and a chemical pozzolanicity test (CPT) at 8 and 15 days were carried out in a second stage to establish the pozzolanic properties of the investigated sample. Finally, a mechanical compressive strength test (MCST) at 7, 28 and 90 days was carried out on specimens made up with PC/NF and PC/CF mixes, at a ratio of 10%, 25% and 40%. XRD, SEM and RS results indicated fluorite as the major mineralogical phase. The CPT and CQA showed an increase in the pozzolanicity of the samples from 8 to 15 days. The MCST showed an increase in compressive strength from 7 to 90 days for both PC/NF and PC/CF specimens. The results obtained establish that fluorite produces positive effects in the mortar and contributes to the gain of mechanical strength over time, being a suitable material for the manufacture of cements with pozzolanic addition with a reduction of CO2 emissions, and by reducing the energy costs of production.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11111367