Magnesium sulfate resistance of silica fume concrete specimens and R.C columns

Title: Magnesium sulfate resistance of silica fume concrete specimens and R.C columns
Author(s): A.M. Diab, A.E. M.Awad, H.E. Elyamany, A.E.M. Abd Elmoty
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 859 - 868
Total Pages: 10
Nb references: 14
Language: English

Abstract: This research work covers the performance of concrete specimens and reinforced concrete columns subjected to a 5% of magnesium sulfate attack for 700 days. This research was divided into two phases. Phase I included the concrete specimens and Phase II included R.C columns. The studied parameters for Phase I were percentage of silica fume cement replacement, w/cm ratio, cement content, and type of cement. Also, the addition of 0.1% polypropylene fiber was considered. Silica fume cement replacement of 0, 10%, 15%, and 25% by weight were used. Type I and Type V Portland cement were used. Cement contents of 300, 350, and 450 kg/m3 were used with 0.4 and 0.5 w/cm ratios. Weight loss, compressive strength, length change, and visual inspection were considered to find the effect of the studied parameters. Concrete of 350 kg/m3 cement content with 0.5 w/cm ratio was used for R.C columns (Phase II). The used silica fume cement replacements in this part were 0, and 15% by weight. Type I and Type V also were used. From test results of Phase I, the measured weight loss, reduction in compressive strength and expansion strain for concretes made of silica fume blended cement were greater than those of concrete specimens without silica fume. Concrete specimens made of Type V Portland cement, low w/cm ratio and high cement content was found more durable to magnesium sulfate attack. R.C columns test results confirmed the concrete specimens test results. A simplified method is presented to determine the strength reduction factor to be used in design concrete element subjected to any concentration of magnesium sulfate attack.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00