Frost-Salt Testing Non-Air Entrained High-Performance Fly-Ash Concrete: Relations Liquid Uptake - Internal Cracking – Scaling

30 Pages Posted: 13 May 2023

See all articles by Iman Asadi

Iman Asadi

Norwegian University of Science and Technology (NTNU)

Terje Kanstad

Norwegian University of Science and Technology (NTNU)

Ola Skjølsvold

affiliation not provided to SSRN

Stefan Jacobsen

Norwegian University of Science and Technology (NTNU) - Department of Structural Engineering

Abstract

Relations between surface scaling -internal damage(expansion) -Liquid Uptake(LU) were investigated in salt-frost slab testing with 3% NaCl. Four fly ash-silica fume concretes with 91d strengths >100 MPa were studied after Normal, Dried, and Wrapped curing. The w/b=0.30 CEM IIA reference mix without additional FA had lowest scaling: < 0.5 kg/m2 /56 cycles, in all 3 curing conditions. All specimens (4 mixes, 3 curing conditions) suffered severe internal damage already after 28 cycles. LU reduces ice thickness and relates best to internal damage, but also to scaling in series with high correlation LU-internal damage. Scaling per cycle peaked early for Dried curing and progress was linear, accelerated and decelerated for Normal, Wrapped and Dried cure, respectively for all 4 mixes. A parametric analysis demonstrated how ice thickness reduced glue spall stress while internal damage (altered E, ν, Δα) increased it slightly. Surface crack penetration depth increased markedly by internal damage.

Keywords: Concrete, Fly ash, freeze-thaw, Scaling, Liquid Uptake, Internal damage

Suggested Citation

Asadi, Iman and Kanstad, Terje and Skjølsvold, Ola and Jacobsen, Stefan, Frost-Salt Testing Non-Air Entrained High-Performance Fly-Ash Concrete: Relations Liquid Uptake - Internal Cracking – Scaling. Available at SSRN: https://ssrn.com/abstract=4447555 or http://dx.doi.org/10.2139/ssrn.4447555

Iman Asadi

Norwegian University of Science and Technology (NTNU) ( email )

Høgskoleringen 7A
Trondheim, 7033
Norway

Terje Kanstad

Norwegian University of Science and Technology (NTNU) ( email )

Høgskoleringen 7A
Trondheim, 7033
Norway

Ola Skjølsvold

affiliation not provided to SSRN ( email )

No Address Available

Stefan Jacobsen (Contact Author)

Norwegian University of Science and Technology (NTNU) - Department of Structural Engineering ( email )

Trondheim NO-7491
Norway

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