CONCRETE WITH HIGH CONTENT OF FLY-ASH FOR COMMON USE IN CONDITIONS OF THE CZECH REPUBLIC

Hana Šáchová, Petr Hunka

Abstract: HVFAC = High Volume Fly Ash Concrete where fly ash is used in excess of 40% having better slump retention, better (lower) temperature of hydration and very cohesive mix. HVFAC is specially designed and final properties depend on combination of raw material, additives, admixtures and especially on quality of fly ash. Klokner Institute cooperates with Chryso Chemie Czech Republic on research programme focused on HVFAC in local conditions of Czech Republic, where main problem is that quality of fly ashes is not good. Article describes optimization process and evolution of admixtures for HVFAC. Basic material properties of fresh and harden concrete are presented (slump test, air content, compressive strength etc.)

Keywords: Fly ash, Concrete, Superplasticizer, and HVFAC

DOI: https://doi.org/10.15623/ijret.2014.0325030