Fly ash and ground granulated blast furnace slag-based alkali-activated concrete: Mechanical, transport and microstructural properties

By Ankur Mehta, Rafat Siddique, Togay Ozbakkaloglu, Faiz Uddin Ahmed Shaikh, R. Belarbi. 2020

205 citations recorded by the source corpus.

Abstract The present study optimizes various parameters such as ratio of alkali solution-fly ash, sodium silicate-sodium hydroxide, fine aggregates-total aggregates, sodium hydroxide concentration, total aggregate content and curing temperatures for the development of fly ash-based alkali-activated concrete using Taguchi method. Also, GGBS is included (0–20%) and further properties such as compressive strength, sorptivity, chloride permeability and microstructural properties of the resultant GGBS-based alkali-activated concrete are studied. Results showed the coexistence of calcium-based hydration products CSH and CASH along with the polymerization products NASH, making the matrix of alkali-activated binder more compact with lesser cracks and pore spaces. The above changes are also reflected in the increase observed in the compressive strength by approximately 52%, and the reductions in the sorptivity and chloride ion penetration by 35% and 78%, respectively, with increasing GGBS content from 0 to 20% in heat cured fly ash based alkali-activated concrete.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a8d533231573bd672c1270942449046206f19288