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Resistance of High-Volume Fly Ash SelfCompacting Concrete to Internal Sulfate Attack

Authors: Tareq S. al-Attar --- Ahmed A. Taha
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 12 Part (A) Engineering Pages: 1260-1266
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper investigates the durability of high-volume Fly ash selfcompactingconcrete, HVFASCC that exposed to internal sulfate attack. At thepresent work, HVFASCC was produced with two Fly ash replacements: 50 and60% by weight of Portland cement. The internal sulfate attack was simulated byadding natural gypsum (CaSO4) that contain ion (SO3-2) to fine aggregate bytwo weight percentages: 1 and 2%. Limestone dust was used as filler with acontent of 100 kg/m3. The cementitious materials, cement and Fly ash, contentwas 400 kg/m3 and the water to powder ratio for the studied mixes was 0.34 byweight. To ensure the self-compact ability of the mixes, slump flow, T500, Vfunneland L-box tests were done. The Compressive, Splitting and Flexuralstrength Tests were extended to the age of 240 days. The results showed thatthere is no significant difference between 1 and 2% of SO3 content on thebehavior of all mixes. The presence of limestone powder in the paste solutioncould have a role in stabilizing ettringite and reducing paste porosity at earlyages. At later age, 240 days, the harmful effect of SO3 is diminished and thatmay be caused by the depletion of gypsum and the dominant product will becalcium monosulfoluminate hydrates instead of calcium sulfoaluminatehydrates

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