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Title: | Mineralogical Characterization of Dolomitic Aggregate Concrete: The Camarasa Dam (Catalonia, Spain) |
Author: | Garcia, Encarnación Alfonso Abella, María Pura Tauler i Ferré, Esperança |
Keywords: | Dolomia Ciment pòrtland Dolomite Portland cement |
Issue Date: | 29-Jan-2020 |
Publisher: | MDPI |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.3390/min10020117 |
It is part of: | Minerals, 2020, vol. 10, num. 2 |
URI: | http://hdl.handle.net/2445/174178 |
Related resource: | https://doi.org/10.3390/min10020117 |
ISSN: | 2075-163X |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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