Freeze/Thaw Durability of Concrete with Fly Ash Master of Science Thesis in the Master’s Programme Structural engineering and Building Performance Design ANNA KNUTSSON Department of Civil and Environmental Engineering Division of Building Technology Building Materials CHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden 2010 Master’s Thesis 2010:154
Freeze/Thaw Durability of Concrete with Fly Ash
May 09, 2023
Fly ash, which is a by-product from combustion of pulverized coal, can partly replace
the cement in concrete. In AMA Anläggning 07 (2008), which is a guideline for
construction of civil engineering structures in Sweden, the content is limited to 6% of
the cement content in exposure class XF4 and 11% in the other exposure classes. The
performance of concrete with fly ash is in many situations improved compared to
Portland cement concretes, but there are fears regarding freeze/thaw durability. The
project aims at investigate the properties of concrete with fly ash, with special focus
on freeze/thaw durability
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The work has mainly been done as a laboratory study. Concretes with different amounts of fly ash (0%, 6% and 20% of cement weight) and different efficiency factors (k=0.4 and k=1.0) has been investigated. Furthermore, the effects of different curing periods and temperature during curing of the concrete with 20% fly ash have been studied. The fly ash was introduced separately to the concrete mixture. The tests have been limited to air entrained concretes with additions of fly ash according to the specifications in SS 13 70 03 (2008). The test performed were foam index test, slump, air content, scaling under freeze/thaw, compressive strength, rapid chloride migration and air void analysis.
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