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Leilla-Luciana Vago 1 Sorin Dan 2 Maura Vioreanu3 UDK: 666.972.11 DOI: 10.14415/konferencijaGFS2018.022 Summary: In order to have a cleaner environment and to reduce emissions of CO2 people are interested in the development of new ternary cements with low fly ash content (max 30%) and high limestone filler content (max 65%). Limestone filler due to its chemical and physical effect (interaction with aluminates) could give rise to a synergetic effect when it is used with fly ash. Despite the fact that the use of fly ash as a cement replacement material increases the long term strength and durability of the concrete, on early ages the strength of fly ash concrete is low, so we have to accelerate the pozzolanic properties of fly ash. This study is investigating the strength of ternary cements (clinkerfly ash-limestone filler) CEM 1v2 (30 V 65 K 5 LL) and CEM 12v2 (30 V 35 K 35 LL) at early age containing three kinds of activators CaSO4 (sulphate), Na2SO4 (sulphate+alkali) and NaOH (alkali) in different proportions.

USING OF LIMESTONE FILLER AND FLY ASH AS PARTIAL SUBSTITUTION OF CEMENT IN CONCRETE