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    STUDIA GEOLOGIA - Issue no. Special%20Issue / 2009  
         
  Article:   MINERALOGY OF DEGRADATION PROCESSES OF SOME CONCRETES AND MORTARS.

Authors:  NICOLAE HAR, MARIA GOREA, MARCEL BENEA. 		 
       
         
  Abstract:  Degradation processes affecting concrete and mortar are the major factor determining their durability. They are controlled by both, the environmental condition of the buildings and the structural-textural and compositional properties of the concrete/mortar. Mineralogical and petrographic studies of the concretes and mortars from three construction works have evidenced several degradation processes. Genetically, two types of degradation processes could be separated: a) Physical - mechanical processes, caused by frost-thaw phenomena. They are illustrated by the occurrence of fissures in the mortar mass, as well as at the concrete/mortar interface; b) Chemical–mineralogical processes including carbonation, sulphate attack and formation of silica gels following alkali – silica reactions (ASR). These processes are favoured by the physical- mechanical ones and consist of specific reactions between the hydrated components of the mortar matrix (cement paste) and the various ions dissolved in the infiltration waters percolating through the pores and fissures within the mortar. They result in newly grown minerals specific to each degradation process. The spatial relationships among the newly formed minerals and the primary components, as well as those among newly formed minerals typical for each degradation process allow the chronological reconstruction of the alteration processes pathway.

Key words: concrete/mortar, carbonation, sulphate attack, secondary silica gel, Romania
  
         
     
         
         
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