文档介绍：Ain Shams university, Faculty of Engineering
A S J C E
Vol. . 1 ISSN: 1687-8590
Effect of Fiber Type on the Mechanical Properties of Normal and High Strength Concrete
H. S. Khalil, A ., A. M. Saba, A. S. Sherbini and H. M. Sallam
Materials Engineering Department, Faculty of Engineering, Zagazig University, Egypt
ARTICLE HISTORY
Received 10/6/2008
Accepted 30/6/2008
ABSTRACT
Results of an experimental investigation of the behavior of fiber reinforced concrete (FRC) are presented in this paper. Properties investigated pressive strength, splitting tensile strength and flexural strength. The independent variables were fiber type, cement content and the presence of silica fume. Three different fiber types (steel "S", glass "G" and polypropylene "PP”) were used in this investigation with volume fractions of %, % and %, respectively. Two different cement contents were used, 350 and 450 kg/m3. Silica fume was added to concrete with the higher cement content by 10% of the cement weight. These three types of Portland cement concrete mixes PCs were used as control groups for the different FRCs. Results of the present work indicated that, the addition of single type of short fibers slightly increased pressive strength of normal strength FRC. Their effect further decreased as the concrete matrix grade increased. The presence of fibers also increased slightly the splitting tensile strength of FRC at different concrete grades. While glass and polypropylene FRC mixes showed only a slight improvement in the flexural strength pared to the results of their corresponding high strength plain concrete (HSPC) mixes, steel fiber reinforced concrete (SFRC) mixes showed post peak ductility and toughness, which can be related to its good mechanical bond due to the filament twin fiber geometry. Therefore, the increase of concrete strength provided by single fibers with small volume fractions and with high level of coarse aggregate content was quite small and th