Shrinkage Behavior of Concrete Incorporating Nano Silica

Document Type : Research articles

Authors

1 Civil Engineering Department, Faculty of Engineering, Al – Azhar University, Egypt

2 Civil Engineering Department, Faculty of Engineering, Cairo University, Egypt

3 Construction Research Institute, National Water Research Centre, Delta Barrage, Egypt

4 Institute of Aviation Engineering and Technology, Cairo, Egypt.

Abstract

Concrete is the most versatile material. Due to the continuous and increasing demands made on concrete to fulfill various and difficult requirements, intensive and extensive research is being carried out in concrete technology area. The long-term behavior of reinforced concrete structures is influenced by many factors that generally depend upon one or more of the following: material properties, geometry of the structure, load history and distribution, and the environmental conditions. Engineers are continuously pushing the limits to enhance concrete performance with the aid of advanced chemical admixtures and supplementary cementitious materials like Nano Silica (NS), Fly Ash (FA), Silica Fume (SF), slag etc. NS is the subject of one of research areas in nano technology. In this study, shrinkage behavior of NS concrete was investigated. Mechanical properties were determined in terms of compressive strength tests which were performed at different ages up to 28 days on cubes of 150x150x150 mm according to the Egyptian Code of Practice. It was found that the compressive strength increased about 40% by addition of 4% NS compared to the control mix. The dimensions of concrete specimens used for measuring shrinkage strains were 100x100x500 mm. It was found that all specimens containing NS have larger values of shrinkage than the control concrete. The specimens which contain 4% NS had the lowest values of shrinkage and that contain 2% NS had the largest values of shrinkage if they compared to other NS specimens.

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