5 Citations (Scopus)

Abstract

The resistance of alkali silicate-activated slag mortars to crack propagation is explored. With increasing SiO2-to-alkali oxide ratio (Ms) of the activating solution (between 1.0 and 2.0), the flexural strengths, fracture energies, and the strain energy release rates (crack resistance, GR) are noted to increase. The GR values, especially of the systems with Ms of 1.5 and 2.0, are higher than that of ordinary portland cement (OPC) mortar. In contrast, the fracture process zone (FPZ) was observed to be smaller for the alkali-activated slag mortars, with higher localized strains. Similarly, the FPZs also shrink with increasing Ms. These responses are related to the differences in the reaction products in these systems. The fundamental differences in the fracture response of these binder systems are elucidated through tracking the FPZ development. The crack extension-crack tip opening displacement relations and its relationship with the inelastic strain energy release rates are also used to bring out the differences between the binder systems.

Original languageEnglish (US)
Pages (from-to)273-280
Number of pages8
JournalJournal of the American Ceramic Society
Volume99
Issue number1
DOIs
StatePublished - Jan 1 2016

Fingerprint

Alkalies
Mortar
Slags
Energy release rate
Strain energy
Cracks
Binders
Silicates
Fracture energy
Portland cement
Reaction products
Crack tips
Bending strength
Oxides
Crack propagation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Elucidating the Crack Resistance of Alkali-Activated Slag Mortars Using Coupled Fracture Tests and Image Correlation. / Dakhane, Akash; Das, Sumanta; Kailas, Siva; Neithalath, Narayanan.

In: Journal of the American Ceramic Society, Vol. 99, No. 1, 01.01.2016, p. 273-280.

Research output: Contribution to journalArticle

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AU - Dakhane, Akash

AU - Das, Sumanta

AU - Kailas, Siva

AU - Neithalath, Narayanan

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N2 - The resistance of alkali silicate-activated slag mortars to crack propagation is explored. With increasing SiO2-to-alkali oxide ratio (Ms) of the activating solution (between 1.0 and 2.0), the flexural strengths, fracture energies, and the strain energy release rates (crack resistance, GR) are noted to increase. The GR values, especially of the systems with Ms of 1.5 and 2.0, are higher than that of ordinary portland cement (OPC) mortar. In contrast, the fracture process zone (FPZ) was observed to be smaller for the alkali-activated slag mortars, with higher localized strains. Similarly, the FPZs also shrink with increasing Ms. These responses are related to the differences in the reaction products in these systems. The fundamental differences in the fracture response of these binder systems are elucidated through tracking the FPZ development. The crack extension-crack tip opening displacement relations and its relationship with the inelastic strain energy release rates are also used to bring out the differences between the binder systems.

AB - The resistance of alkali silicate-activated slag mortars to crack propagation is explored. With increasing SiO2-to-alkali oxide ratio (Ms) of the activating solution (between 1.0 and 2.0), the flexural strengths, fracture energies, and the strain energy release rates (crack resistance, GR) are noted to increase. The GR values, especially of the systems with Ms of 1.5 and 2.0, are higher than that of ordinary portland cement (OPC) mortar. In contrast, the fracture process zone (FPZ) was observed to be smaller for the alkali-activated slag mortars, with higher localized strains. Similarly, the FPZs also shrink with increasing Ms. These responses are related to the differences in the reaction products in these systems. The fundamental differences in the fracture response of these binder systems are elucidated through tracking the FPZ development. The crack extension-crack tip opening displacement relations and its relationship with the inelastic strain energy release rates are also used to bring out the differences between the binder systems.

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