Alkali activated slag concretes designed for a desired slump, strength and chloride diffusivity

Dali Bondar, Qianmin Ma, Marios Soutsos, Muhammed Basheer, John L. Provis, Sreejith Nanukuttan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Ground granulated blast furnace slag (GGBS) is the most common industrial by-product used as a precursor for alkali activated binders due to its fast setting, simple curing needs, and good early age strength gain. There are conflicting findings on the chloride penetration resistance of such binders and more information is required regarding the suitability of this type of binder material for chloride environments. This article outlines the findings of investigation of alkali activated slag concretes (AASC), to provide a comprehensive view of the effect of mix design variables on slump, strength, and chloride transport and binding. It is concluded that AASC can be designed for different workability and different grades of concrete. The diffusivity results demonstrate that the addition of excess water does not directly control the pore structure/connectivity in AASC as it does for Portland cement, and therefore AASC can be designed based on the water/binder ratio needed for a specified mechanical performance. The chloride binding capacity increased as the paste content of the concrete and/or the silica content of the activator was increased.
Original languageEnglish
Pages (from-to)191-199
Number of pages9
JournalConstruction and Building Materials
Volume190
Early online date25 Sep 2018
DOIs
Publication statusPublished - 30 Nov 2018

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