TY - GEN
T1 - Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments
AU - Bondar, Dali
AU - Nanukuttan, Sreejith V.
AU - Soutsos, Marios N.
AU - Basheer, P. A. Muhammed
AU - Provis, John L.
N1 - Publication: ACI Special Publication, Volume: 320, p 35.1-35.14, 14p
PY - 2017/10/1
Y1 - 2017/10/1
N2 - This study investigates chloride ingress into alkali-activated slag/fly ash (AA-S/F) concretes with various ratios of slag to fly ash (80/20, 60/40, 40/60 and 20/80). Alkaline activators were a mixture of sodium hydroxide and sodium silicate to obtain between 6-8% sodium hydroxide (NaOH) concentration by weight of cementitious material. The SiO2/Na2O ratios (silica modulus, Ms) of mixtures were 0.45, 1.0 and 1.25. Tests applied included typical fresh and hardened properties, air content, slump, compressive strength, bulk resistivity and non-steady state chloride migration. The results show that while attractive engineering properties can be achieved, the chloride ingress in the AA-S/F concretes studied here with ≥ 20% fly ash is moderate to high and this may make them unsuitable for use in reinforced concrete in chloride environments.
AB - This study investigates chloride ingress into alkali-activated slag/fly ash (AA-S/F) concretes with various ratios of slag to fly ash (80/20, 60/40, 40/60 and 20/80). Alkaline activators were a mixture of sodium hydroxide and sodium silicate to obtain between 6-8% sodium hydroxide (NaOH) concentration by weight of cementitious material. The SiO2/Na2O ratios (silica modulus, Ms) of mixtures were 0.45, 1.0 and 1.25. Tests applied included typical fresh and hardened properties, air content, slump, compressive strength, bulk resistivity and non-steady state chloride migration. The results show that while attractive engineering properties can be achieved, the chloride ingress in the AA-S/F concretes studied here with ≥ 20% fly ash is moderate to high and this may make them unsuitable for use in reinforced concrete in chloride environments.
KW - alkali activated slag/fly ash concretes
KW - bulk resistivity
KW - chloride migration coefficient
KW - compressive strength
KW - workability
M3 - Conference contribution
T3 - ACI Symposium Special Publications
SP - 35.1-35.14
BT - International Conference on Cementious Materials and Altenative Binders for Sustainable Concrete (ICCM) 2017: Proceedings
PB - RILEM Publications
T2 - 2017 ICCM
Y2 - 2 October 2017 through 4 October 2017
ER -