INFLUENCE OF INTERNAL SULPHATE ATTACK ON SOME OF PROPERTIES FOR CONCRETE CONTAINING RECYCLED AGGREGATE | ||
| AL-TAQANI | ||
| Article 1, Volume 25, Issue 3, September 2012, Pages 0-0 | ||
| Author | ||
| Jabbar Abbas Jabir | ||
| Abstract | ||
| This paper presents a comprehensive experimental study on the resistance of concrete made of partial or full replacement of natural fine and coarse aggregates by recycled aggregates to internal sulphate attach as the main problem in concrete production in Iraq . The replacement and sulphate levels added were the main test variables in this study. The sulphate levels investigated were (0.5 , 1.0 , 2.0 and 2.5%) of fine aggregate weight in addition to that of control sulphate level, while the aggregate replacements levels were (25, 50, 75,and 100%) of those natural fine and coarse aggregates weights. The variations of linear expansion and compressive strength were measured carefully and periodically up to the age of 180 days for both natural and recycled aggregate concretes . Results indicated that , partial replacement of (75%) level by recycled coarse aggregate or recycled fine aggregate was practically possible without impairing the concrete resistance to sulphate for all SO3 levels up to (1.0 and 2.0%) respectively at all the ages studied . Full replacement level by one type of recycled aggregate on the (1.0%) SO3 level was practically possible at all the ages studied . Full replacement level by both types of recycled aggregates must be done in the lower SO3 levels up to (0.5%) at all the ages studied. Fifty percent replacement level by both recycled aggregates was practically possible for the all ages and SO3 levels up to (1.0%) | ||
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