Effect of Calcareous Fly-ash Processing Methods on Rheological Properties of Mortars

The paper presents the results of research into the influence of calcareous fly ash (CFA) processing methods on the rheological properties of mortars. The study consisted of a comparison of changes of the rheological properties (plastic viscosity and yield value) of the mortars during 90 minutes when CFA, unprocessed or processed by grinding, grain separation, or selective collection from the filter, was used as a substitute for a part of the cement. The results show that processing of CFA decreases its negative influence on the rheological properties; the efficient methods are separation or grinding, while the effect of selective collection is almost insignificant.

[1]  Halit Yazici,et al.  The effect of silica fume and high-volume Class C fly ash on mechanical properties, chloride penetration and freeze–thaw resistance of self-compacting concrete , 2008 .

[2]  Wei Sun,et al.  ANALYSIS OF MECHANISM ON WATER-REDUCING EFFECT OF FINE GROUND SLAG, HIGH-CALCIUM FLY ASH, AND LOW-CALCIUM FLY ASH , 2003 .

[3]  V. Papadakis.  Effect of fly ash on Portland cement systems. Part II. High-calcium fly ash , 1999 .

[4]  Z. Giergiczny,et al.  Calcareous Fly Ash as a Main Constituent of Common Cements , 2014 .

[5]  Phillip Frank Gower Banfill,et al.  The rheology of fresh mortar , 1991 .

[6]  Burak Felekoğlu,et al.  Optimization of fineness to maximize the strength activity of high-calcium ground fly ash – Portland cement composites , 2009 .

[7]  V. S. Ramachandran,et al.  Concrete Admixtures Handbook: Properties, Science and Technology , 1996 .

[8]  Z. Giergiczny,et al.  Pozzolanic and hydraulic activity of calcareous fly ash , 2013 .

[9]  A. Zybura,et al.  Evaluation of protective properties of concretes made of cements with calcareous fly ash with respect to reinforcing steel , 2014 .

[10]  Rebecca A. Atadero,et al.  OPTIMIZATION OF FLY ASH IN CONCRETE : High Lime Fly Ash as a Replacement for Cement and Filler Material , 2009 .

[11]  V. M. Malhotra,et al.  The rheology of fresh concrete , 1984 .

[12]  Phillip Frank Gower Banfill,et al.  THE RHEOLOGY OF FRESH CEMENT AND CONCRETE - A REVIEW , 2003 .

[13]  W. Drożdż,et al.  Evaluation of properties of domestic calcareous fly ash and its processing methods , 2013 .

[14]  S. Tsimas,et al.  High-calcium fly ash as the fourth constituent in concrete: problems, solutions and perspectives , 2005 .