Observation and Experience of Using Mechanically Activated Fly Ash in Concrete

Authors: R. Hela, L. Bodnarova

Abstract:

Paper focuses on experimental testing of possibilities of mechanical activation of fly ash and observation of influence of specific surface and granulometry on final properties of fresh and hardened concrete. Mechanical grinding prepared various fineness of fly ash, which was classed by specific surface in accordance with Blain and their granulometry was determined by means of laser granulometer. Then, sets of testing specimens were made from mix designs of identical composition with 25% or Portland cement CEM I 42.5 R replaced with fly ash with various specific surface and granulometry. Mix design with only Portland cement was used as reference. Mix designs were tested on consistency of fresh concrete and compressive strength after 7, 28, 60 and 90 days.

Keywords: Concrete, fly ash, latent hydraulicity, mechanically activated fly ash.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1335864

References:

[1] K. Kiattikomol, CH. Jaturaitakkul, S. Songpiriyakij, and S. Chutubtim, "A study of ground coarse fly ashes with different fineness from various sources as pozzolanic materials”, in Cement Concrete Composite, 23, pp. 335–343, 2001.
[2] A. B. Aravindkumar, and S. S. Awanti, "Laboratory Investigations on Mechanical Properties of High Volume Fly Ash Concrete and Composite Sections”, in World Academy of Science, Engineering and Technology, 76, pp. 1366-1370, 2013.
[3] EN 197-1 Cement - Part 1: Composition, specifications and conformity criteria for common cements.
[4] EN 450-1 Fly ash for concrete - Part 1: Definition, specifications and conformity criteria.
[5] EN 450 – 2 Fly ash for concrete - Part 2: Conformity evaluation.
[6] R. Hela, J. Maršálová, L. Bodnárová, "Properties of Self-Compacting Concrete (SCC) Made High Content of Fly Ash,” in CANMET/ACI International conference on Recent Advances in concrete, Las Vegas, pp. 1 – 13, 2004.
[7] D. Orsakova, "Verification of a possibility of adjusting additives of type I and II to increase activity and for use in concrete,” in Master´s thesis, Brno, Brno University of Technology, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components, Vol. 112, 2011.