Performance of Alkali -Activated Slag Concrete

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Title: Performance of Alkali -Activated Slag Concrete

Author(s): S. Al-Otaibi, C. J. Lynsdale, and J. H. Sharp

Publication: Special Publication

Volume: 202

Issue:

Appears on pages(s): 467-474

Keywords: alkali-activated concrete; blast-furnace slag; compressive strength; drying shrinkage; dynamic modulus; environmental; splitting tensile strength; water-glass

Date: 8/1/2001

Abstract:
Environmental about the high energy consumption and huge emissions of CO2 associated with the production of portland cement are leading to the search for more environmentally viable alternatives to portland cement. One of these alternative materials isalkali-activated slag (AAS) in which ground, granulated blast furnace slag is used not as a partial replacement to cement but as a binder in itself in the production of concrete. This paper presents results of tests carried out to study the performance of alkali-activated slag concrete using sodium silicate (water-glass) as an activator in NazO dosages of 4 and 6%. The fresh concrete properties (setting time, workability and air content) were examined in addition to the engineering properties (compressive strength, splitting tensile strength, drying shrinkage, dynamic modulus of elasticity and ultrasonic pulse velocity). Hydration products were identified using XRD.