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Open AccessArticle

Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain)

1
Departament d’Enginyeria Electrònica, Escola d’Enginyeria de Barcelona Est (EEBE), Universitat Politècnica de Catalunya Barcelona Tech, Av. d’Eduard Maristany 16, E-08019 Barcelona, Spain
2
Departament d’Enginyeria Minera, Industrial i TIC, Universitat Politècnica de Catalunya Barcelona Tech, Av. Bases de Manresa 61-63, 08242 Manresa, Barcelona, Spain
3
Departament de Mineralogia, Petrologia i Geologia Aplicada, Universitat de Barcelona, Carrer Martí i Franquès s/n, 08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(2), 117; https://doi.org/10.3390/min10020117
Received: 31 December 2019 / Revised: 20 January 2020 / Accepted: 26 January 2020 / Published: 29 January 2020
(This article belongs to the Special Issue Industrial Minerals)
The Camarasa Dam was built in 1920 using dolomitic aggregate and Portland cement with two different compositions: type A (dolomite and Portland cement) and type B (dolomite and sand-cement). The sand cement was a finely powdered mixture of dolomite particles and clinker of Portland cement. The mineralogy of concrete was studied by optical microscopy, scanning electron microscopy, and x-ray powder diffraction. Reaction of dedolomitization occurred in the two types of concrete of the Camarasa Dam, as demonstrated by the occurrence of calcite, brucite, and/or absence of portlandite. In the type A concrete, calcite, brucite, and a serpentine-group mineral precipitated as a rim around the dolomite grains and in the paste. The rims, a product of the dedolomitization reaction, protected the surface of dolomite from the dissolution process. In type B concrete, in addition to dolomite and calcite, quartz and K-feldspar were present. Brucite occurred in lower amounts than in the type A concrete as fibrous crystals randomly distributed in the sand-cement paste. Although brucite content was higher in the type A concrete, type B showed more signs of loss of durability. This can be attributed to the further development of the alkali-silica reaction in this concrete type. View Full-Text
Keywords: dolomite; sand-cement; concrete; dedolomitization reaction dolomite; sand-cement; concrete; dedolomitization reaction
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Garcia, E.; Alfonso, P.; Tauler, E. Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain). Minerals 2020, 10, 117.

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