Garcia, EncarnaciónAlfonso Abella, María PuraTauler i Ferré, Esperança2021-02-232021-02-232020-01-292075-163Xhttps://hdl.handle.net/2445/174178The 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.13 p.application/pdfengcc-by (c) Garcia, Encarnación et al., 2020http://creativecommons.org/licenses/by/3.0/esDolomiaCiment pòrtlandDolomitePortland cementinfo:eu-repo/semantics/article7038712021-02-23info:eu-repo/semantics/openAccess