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    STUDIA CHEMIA - Issue no. 4 / 2014  
         
  Article:   CHEMICAL AND MICROSTRUCTURAL CHARACTERISATION OF CONCRETE MINERAL ADDITIVES.

Authors:  MARIA GOREA, NICOLAE HAR. 		 
       
         
  Abstract:  This paper summarizes chemical and mineralogical information on concrete mineral additives such as silica fume, fly ash from Mintia and metakaolin, as well as on concrete samples that were obtained by using these additives. The experiments were performed on seven concrete mixtures, with the following composition: S-1=standard concrete, S-2=concrete with 10 % fly ash (FA), S-3=concrete with 10 % metakaolin (MK), S-4=concrete with 10 % FA 10 % MK, S-5=concrete with 10 % silica fume (SF), S-6=concrete with 10 % SF 10 % FA, and S-7=concrete with 10 % SF 10 % MK. The XRD powder diffraction patterns on all these samples indicate the presence of amorphous phases, in particular in the silica fume, besides crystalline phases in metakaolin and the fly ash. The concrete samples consist of calcium silicates, calcium aluminates and calcium ferrites hydrates, calcium hydroxide, sulphated forms of calcium aluminates and respectively phases from the aggregates and the additives used. The particle size is sub-micrometric, with ash particles being the finest. Structurally, concretes are built-up of aggregate, cement matrix with hydration components, pores and “impurities”.

Key word: concrete, pozzolanic additives, by-products, fly ash, metakaolin, silica fume
 
         
     
         
         
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