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标题：Influence of silica fume on mechanical and physical properties of recycled aggregate concrete
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作者：Özgür Çakır ; Özgür Çakır ; Ömer Özkan Sofyanlı 等
期刊名称：HBRC Journal
印刷版ISSN：1687-4048
出版年度：2015
卷号：11
期号：2
页码：157-166
DOI：10.1016/j.hbrcj.2014.06.002
语种：English
出版社：Elsevier
摘要：Abstract Several studies related to sustainable concrete construction have encouraged development of composite binders, involving Portland cement, industrial by-products, and concrete mixes with partial replacement of natural aggregate with recycled aggregate. In this paper, the effects of incorporating silica fume (SF) in the concrete mix design to improve the quality of recycled aggregates in concrete are presented. Portland cement was replaced with SF at 0%, 5% and 10%. Specimens were manufactured by replacing natural aggregates with recycled aggregates. Two size fractions (4/12mm and 8/22mm) as recycled aggregates were used and four series of concrete mixtures were produced. In all concrete mixtures, a constant water/binder ratio at 0.50 was used and concrete mixtures with a target initial slump of S4 class (16–21cm) were prepared. Concrete properties were evaluated by means of compressive strength, tensile splitting strength, water absorption and ultrasonic pulse velocity and it was found that, using 10% SF as a cement replacement for recycled aggregate concretes enhanced the mechanical and physical properties of concrete. At all the test ages the tensile splitting strength gain of the natural aggregate concrete mixture (NA) with and without SF was higher than that of the recycled concrete mixtures. Continuous and significant improvement in the tensile splitting strength of recycled aggregate concretes incorporating SF was observed. Similar to compressive strength test results, concrete incorporating 10% SF and containing 4/12mm fraction recycled aggregates showed better performance among recycled aggregate concretes.
关键词：Recycled aggregate concrete; Silica fume; Mechanical properties; Physical properties;