Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments

Dali Bondar; Sreejith V. Nanukuttan; Marios N. Soutsos; P. A. Muhammed Basheer; John L. Provis

Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments

Dali Bondar
, Sreejith V. Nanukuttan
, Marios N. Soutsos
, P. A. Muhammed Basheer
, John L. Provis

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

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.

Original language	English
Title of host publication	International Conference on Cementious Materials and Altenative Binders for Sustainable Concrete (ICCM) 2017: Proceedings
Publisher	RILEM Publications
Pages	35.1-35.14
Publication status	Published (in print/issue) - 1 Oct 2017

Publication series

Name	ACI Symposium Special Publications
Publisher	RILEM Publications

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure

Keywords

alkali activated slag/fly ash concretes
bulk resistivity
chloride migration coefficient
compressive strength
workability

Cite this

Bondar, D., Nanukuttan, S. V., Soutsos, M. N., Basheer, P. A. M., & Provis, J. L. (2017). Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments. In International Conference on Cementious Materials and Altenative Binders for Sustainable Concrete (ICCM) 2017: Proceedings (pp. 35.1-35.14). (ACI Symposium Special Publications). RILEM Publications .

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title = "Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments",

abstract = "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.",

keywords = "alkali activated slag/fly ash concretes, bulk resistivity, chloride migration coefficient, compressive strength, workability",

author = "Dali Bondar and Nanukuttan, \{Sreejith V.\} and Soutsos, \{Marios N.\} and Basheer, \{P. A. Muhammed\} and Provis, \{John L.\}",

year = "2017",

month = oct,

day = "1",

language = "English",

series = "ACI Symposium Special Publications",

publisher = "RILEM Publications ",

pages = "35.1--35.14",

booktitle = "International Conference on Cementious Materials and Altenative Binders for Sustainable Concrete (ICCM) 2017: Proceedings",

address = "France",

}

Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments. / Bondar, Dali; Nanukuttan, Sreejith V.; Soutsos, Marios N. et al.
International Conference on Cementious Materials and Altenative Binders for Sustainable Concrete (ICCM) 2017: Proceedings. RILEM Publications , 2017. p. 35.1-35.14 (ACI Symposium Special Publications).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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.

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

ER -

Suitability Of Alkali Activated GGBS/fly Ash Concrete For Chloride Environments

Abstract

Publication series

UN SDGs

Keywords

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