Print Email Facebook Twitter Experimental study on workability of alkali activated fly ash and slag-based geopolymer concretes Title Experimental study on workability of alkali activated fly ash and slag-based geopolymer concretes Author Arbi, K.A. Nedeljkovic, M. Zuo, Y. Grunewald, S. Keulen, A. Ye, G. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2015-12-31 Abstract This paper presents an investigation on workability and strength of geopolymer concrete made of fly ash (FA), blast furnace slag (BFS) and a multicompound activator of Na2SiO3 and NaOH solutions. The FA/BFS ratios were 100:0, 70:30, 60:40, 50:50, 40:60, 30:70 and 0:100. The workability of geopolymer concretes was performed by using slump test and controlled by using different types of admixtures. Polycarboxilate, melamine, naphthalene-based superplasticizers (SPs) and retarders were used. The results showed that when alkali activating solution to binder ratio is fixed, a good workability was achieved without SPs for FA rich mixtures. However for BFS rich mixtures a combination of SPs and retarder was needed to reach similar workability and setting. The increase of slag content increased the compressive strength but decreased the workability and setting time. In all mixtures, a good workability with slump values between 20-25 cm and high compressive strength (~70MPa at 7d) were achieved when retarder and superplasticizer were added into the mixtures. For slag based geopolymer concretes, the best performances were found by using N-based SPs. The air content measured for all mixtures was between 2.5-3%. Subject fly ashblast furnace slaggeopolymer concreteworkabilityadmixtures To reference this document use: http://resolver.tudelft.nl/uuid:06548144-39a6-4c11-b347-5463b9c3cf13 Publisher ECI ISBN 978-1-326-37732-8 Source Proceedings of the 1st ECI conference on Geopolymers, Hernstein, Asutria, 24-25 May, 2015; Authors version Part of collection Institutional Repository Document type conference paper Rights (c) 2015 The Author(s) Files PDF 319566.pdf 209.95 KB Close viewer /islandora/object/uuid:06548144-39a6-4c11-b347-5463b9c3cf13/datastream/OBJ/view