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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.1 din 2009 | |||||||
Articol: |
MINERALOGY OF DEGRADATION PROCESSES AFFECTING THE MORTAR FROM BURU DAM (ARIEŞULUI VALLEY, CLUJ COUNTY). Autori: NICOLAE HAR, MARIA GOREA, MARCEL BENEA. |
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Rezumat: The objective under study is represented by the dam construction work across Arieş River on the area of Buru locality (Cluj County). The mortar used in dam construction is affected by carbonation, sulphates attack and alkali-silica reactions. Carbonation is materialized by calcite precipitation in matrix mortar, visible as efflorescences on surface and along the fissures within the mortar. Sulphate attack results in ettringite II genesis, located in the pores of the mortar. The alkali-silica reactions lead to the formation of silica gels deposited on the internal walls of the pores where they progressively crystallize and turn into cryptocrystalline silica. There are various causes for alteration processes, from atmospheric factors to the microenvironment resulted from the high polluants concentration into the Arieş River water. Keywords: mortar, carbonation, sulphate attack, alkali – silica reactions |
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