Influence of Silica Fume on the Properties of Self Compacting Concrete

A self-compacting concrete (SCC) is the one that can be placed in the form and can go through obstructions by its own weight and without the need of vibration. Since its first development in Japan in 1988, SCC has gained wider acceptance in Japan, Europe and USA due to its inherent distinct advantages. Although there are visible signs of its gradual acceptance in the North Africa through its limited use in construction, Libya has yet to explore the feasibility and applicability of SCC in new construction. The contributing factors to this reluctance appear to be lack of any supportive evidence of its suitability with local aggregates and the harsh environmental conditions. The primary aim of this study is to explore the feasibility of using SCC made with local aggregates of Eastern Province of Libya by examining its basic properties characteristics. This research consists of: (i) Development of a suitable mix for SCC such as the effect of water to cement ratio, limestone and silica fume that would satisfy the requirements of the plastic state; (ii) Casting of concrete samples and testing them for compressive strength and unit weight. Local aggregates, cement, admixtures and industrial waste materials were used in this research. The significance of this research lies in its attempt to provide some performance data of SCC made in the Eastern Province of Libya so as to draw attention to the possible use of SCC.

Authors:

• Salem Alsanusi

Keywords:

• Silica fume
• self compacting concrete
• workability
• coarse and fine aggregate.

References:

[1] J. M., Bartos, "Measurement of Key Properties of Fresh Self-compacting
Concrete", CEN/PNR Workshop, Paris, 2000.
[2] H., Okamura, "Self-Compacting High-Performance Concrete", Concrete
International, pp. 50-54, 1997.
[3] K. Ozawa, K., Maekawa, M., Kunishima, and H. Okamura,
"Development of High Performance Concrete Based on the Durability
Design of Concrete Structures", Proceedings of the Second East-Asia
and Pacific Conference on Structural Engineering and Construction
(EASEC-2), Vol. 1, pp. 445-450, January 1989.
[4] C. F., Ferraris, Brower, J. Daczko., Ozyldirim, C., "Workability of Self-
Compacting Concrete", Journal of Research of NIST, Vol. 104, No. 5,
pp.461-478, 1999.
[5] EFNARC, "Specifications and Guidelines for Self-Compacting
Concrete", EFNARC, UK (www.efnarc.org), pp. 1-32, February 2002.