engleski

Autogenous deformation of dolomite based self-compacting concretes with different mineral aditives

Early age cracking can influence the long-term performance of concrete structures to a certain extent. Compared to conventional types, high performance concretes with higher amount of cement paste as it is self-compacting concrete, has a greater potential for occurrence of early age cracking due to autogenous deformations. The main objective of the present paper is to analyse autogenous deformations of the self - compacting concretes made with dolomite powder and mineral additives as cement replacement. Ten self-compacting concrete mixtures has been studied where the control mixture included ordinary Portland cement and dolomite filler, while in nine other mixtures part of the cement was replaced by 20 – 40% fly ash, 5 – 15% metakaolin and 5 – 15% limestone. As hydration is the main governing power of autogenous deformation process, heat of hydration, as complementary method to autogenous deformations, was measured in order to present influence of different mineral additives on hydration process.

self-compacting concrete; mineral additives; dolomite filler; autogenous deformation; heat of hydration

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