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2020-01-29

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cc-by (c) Garcia, Encarnación et al., 2020
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/174178

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

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Recurs relacionat

https://doi.org/10.3390/min10020117

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The Camarasa Dam was built in 1920 using dolomitic aggregate and Portland cement with two di erent 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 di raction. 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.

Matèries

Dolomia, Ciment pòrtland

Matèries (anglès)

Dolomite, Portland cement

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Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

Citació

GARCIA, Encarnación, ALFONSO ABELLA, María Pura and TAULER I FERRÉ, Esperança. Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain). Minerals. 2020. Vol. 10, num. 2. ISSN 2075-163X. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/174178

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