Microstructural, Mechanical, and Durability Related Similarities in Concretes Based on OPC and Alkali-Activated Slag Binders

Kirk Vance, Matthew Aguayo, Akash Dakhane, Deepak Ravikumar, Jitendra Jain, Narayanan Neithalath

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Alkali-activated slag concretes are being extensively researched because of its potential sustainability-related benefits. For such concretes to be implemented in large scale concrete applications such as infrastructural and building elements, it is essential to understand its early and long-term performance characteristics vis-à-vis conventional ordinary portland cement (OPC) based concretes. This paper presents a comprehensive study of the property and performance features including early-age isothermal calorimetric response, compressive strength development with time, microstructural features such as the pore volume and representative pore size, and accelerated chloride transport resistance of OPC and alkali-activated binder systems. Slag mixtures activated using sodium silicate solution (SiO2-to-Na2O ratio or Ms of 1-2) to provide a total alkalinity of 0.05 (Na2O-to-binder ratio) are compared with OPC mixtures with and without partial cement replacement with Class F fly ash (20 % by mass) or silica fume (6 % by mass). Major similarities are noted between these binder systems for: (1) calorimetric response with respect to the presence of features even though the locations and peaks vary based on Ms, (2) compressive strength and its development, (3) total porosity and pore size, and (4) rapid chloride permeability and non-steady state migration coefficients. Moreover, electrical impedance based circuit models are used to bring out the microstructural features (resistance of the connected pores, and capacitances of the solid phase and pore-solid interface) that are similar in conventional OPC and alkali-activated slag concretes. This study thus demonstrates that performance-equivalent alkali-activated slag systems that are more sustainable from energy and environmental standpoints can be proportioned.

Original languageEnglish (US)
Pages (from-to)289-299
Number of pages11
JournalInternational Journal of Concrete Structures and Materials
Volume8
Issue number4
DOIs
StatePublished - 2014

Fingerprint

Portland cement
Slags
Binders
Durability
Concretes
Compressive strength
Pore size
Silica fume
Acoustic impedance
Alkalinity
Fly ash
Silicates
Sustainable development
Cements
Capacitance
Porosity
Sodium
Networks (circuits)

Keywords

  • alkali-activated slag
  • chloride transport
  • durability
  • electrical impedance
  • isothermal calorimetry
  • microstructure

ASJC Scopus subject areas

  • Ocean Engineering
  • Civil and Structural Engineering

Cite this

Microstructural, Mechanical, and Durability Related Similarities in Concretes Based on OPC and Alkali-Activated Slag Binders. / Vance, Kirk; Aguayo, Matthew; Dakhane, Akash; Ravikumar, Deepak; Jain, Jitendra; Neithalath, Narayanan.

In: International Journal of Concrete Structures and Materials, Vol. 8, No. 4, 2014, p. 289-299.

Research output: Contribution to journalArticle

@article{d0c7d57b2203471fa9d35431acdda0f5,
title = "Microstructural, Mechanical, and Durability Related Similarities in Concretes Based on OPC and Alkali-Activated Slag Binders",
abstract = "Alkali-activated slag concretes are being extensively researched because of its potential sustainability-related benefits. For such concretes to be implemented in large scale concrete applications such as infrastructural and building elements, it is essential to understand its early and long-term performance characteristics vis-{\`a}-vis conventional ordinary portland cement (OPC) based concretes. This paper presents a comprehensive study of the property and performance features including early-age isothermal calorimetric response, compressive strength development with time, microstructural features such as the pore volume and representative pore size, and accelerated chloride transport resistance of OPC and alkali-activated binder systems. Slag mixtures activated using sodium silicate solution (SiO2-to-Na2O ratio or Ms of 1-2) to provide a total alkalinity of 0.05 (Na2O-to-binder ratio) are compared with OPC mixtures with and without partial cement replacement with Class F fly ash (20 {\%} by mass) or silica fume (6 {\%} by mass). Major similarities are noted between these binder systems for: (1) calorimetric response with respect to the presence of features even though the locations and peaks vary based on Ms, (2) compressive strength and its development, (3) total porosity and pore size, and (4) rapid chloride permeability and non-steady state migration coefficients. Moreover, electrical impedance based circuit models are used to bring out the microstructural features (resistance of the connected pores, and capacitances of the solid phase and pore-solid interface) that are similar in conventional OPC and alkali-activated slag concretes. This study thus demonstrates that performance-equivalent alkali-activated slag systems that are more sustainable from energy and environmental standpoints can be proportioned.",
keywords = "alkali-activated slag, chloride transport, durability, electrical impedance, isothermal calorimetry, microstructure",
author = "Kirk Vance and Matthew Aguayo and Akash Dakhane and Deepak Ravikumar and Jitendra Jain and Narayanan Neithalath",
year = "2014",
doi = "10.1007/s40069-014-0082-3",
language = "English (US)",
volume = "8",
pages = "289--299",
journal = "International Journal of Concrete Structures and Materials",
issn = "1976-0485",
publisher = "Springer Science + Business Media",
number = "4",

}

TY - JOUR

T1 - Microstructural, Mechanical, and Durability Related Similarities in Concretes Based on OPC and Alkali-Activated Slag Binders

AU - Vance, Kirk

AU - Aguayo, Matthew

AU - Dakhane, Akash

AU - Ravikumar, Deepak

AU - Jain, Jitendra

AU - Neithalath, Narayanan

PY - 2014

Y1 - 2014

N2 - Alkali-activated slag concretes are being extensively researched because of its potential sustainability-related benefits. For such concretes to be implemented in large scale concrete applications such as infrastructural and building elements, it is essential to understand its early and long-term performance characteristics vis-à-vis conventional ordinary portland cement (OPC) based concretes. This paper presents a comprehensive study of the property and performance features including early-age isothermal calorimetric response, compressive strength development with time, microstructural features such as the pore volume and representative pore size, and accelerated chloride transport resistance of OPC and alkali-activated binder systems. Slag mixtures activated using sodium silicate solution (SiO2-to-Na2O ratio or Ms of 1-2) to provide a total alkalinity of 0.05 (Na2O-to-binder ratio) are compared with OPC mixtures with and without partial cement replacement with Class F fly ash (20 % by mass) or silica fume (6 % by mass). Major similarities are noted between these binder systems for: (1) calorimetric response with respect to the presence of features even though the locations and peaks vary based on Ms, (2) compressive strength and its development, (3) total porosity and pore size, and (4) rapid chloride permeability and non-steady state migration coefficients. Moreover, electrical impedance based circuit models are used to bring out the microstructural features (resistance of the connected pores, and capacitances of the solid phase and pore-solid interface) that are similar in conventional OPC and alkali-activated slag concretes. This study thus demonstrates that performance-equivalent alkali-activated slag systems that are more sustainable from energy and environmental standpoints can be proportioned.

AB - Alkali-activated slag concretes are being extensively researched because of its potential sustainability-related benefits. For such concretes to be implemented in large scale concrete applications such as infrastructural and building elements, it is essential to understand its early and long-term performance characteristics vis-à-vis conventional ordinary portland cement (OPC) based concretes. This paper presents a comprehensive study of the property and performance features including early-age isothermal calorimetric response, compressive strength development with time, microstructural features such as the pore volume and representative pore size, and accelerated chloride transport resistance of OPC and alkali-activated binder systems. Slag mixtures activated using sodium silicate solution (SiO2-to-Na2O ratio or Ms of 1-2) to provide a total alkalinity of 0.05 (Na2O-to-binder ratio) are compared with OPC mixtures with and without partial cement replacement with Class F fly ash (20 % by mass) or silica fume (6 % by mass). Major similarities are noted between these binder systems for: (1) calorimetric response with respect to the presence of features even though the locations and peaks vary based on Ms, (2) compressive strength and its development, (3) total porosity and pore size, and (4) rapid chloride permeability and non-steady state migration coefficients. Moreover, electrical impedance based circuit models are used to bring out the microstructural features (resistance of the connected pores, and capacitances of the solid phase and pore-solid interface) that are similar in conventional OPC and alkali-activated slag concretes. This study thus demonstrates that performance-equivalent alkali-activated slag systems that are more sustainable from energy and environmental standpoints can be proportioned.

KW - alkali-activated slag

KW - chloride transport

KW - durability

KW - electrical impedance

KW - isothermal calorimetry

KW - microstructure

UR - http://www.scopus.com/inward/record.url?scp=84926426718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84926426718&partnerID=8YFLogxK

U2 - 10.1007/s40069-014-0082-3

DO - 10.1007/s40069-014-0082-3

M3 - Article

VL - 8

SP - 289

EP - 299

JO - International Journal of Concrete Structures and Materials

JF - International Journal of Concrete Structures and Materials

SN - 1976-0485

IS - 4

ER -