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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 11 Abstracts search results
Document:
SP146-04
Date:
June 1, 1994
Author(s):
N. Banthia, A. Moncef, and J. Sheng
Publication:
Symposium Papers
Volume:
146
Abstract:
Stress-strain curves in uniaxial tension are obtained for microfiber reinforced concrete composites containing high-volume fractions of carbon, steel, and polypropylene fibers, both in mono and hybrid (combination) forms. Based on these curves, considerable strengthening, toughening, and stiffening of the host matrix due to microfiber reinforcement are demonstrated. Such fiber characteristics as geometry, tensile strength, elastic modulus, and surface texture are shown to be significant. In hybrid fiber composites, different fibers appear to act as additive phases, i.e., they maintain their individual reinforcing capabilities. The potential of these composites for use in thin-sheet products and similar applications, and the need for continued research in this area, are recognized.
DOI:
10.14359/4588
SP146-07
P. Paramasivam, T. F. Fwa, and C. M. Lau
An analytical and experimental investigation is carried out to study the flexural behavior of concrete pavements rehabilitated with different types of overlays such as plain mortar, steel fiber mortar, and ferrocement. Explicit expressions are derived for the load-deflection characteristics based on the basic properties of constituent materials. Analytically predicted load-deflection curves are found to agree well with the experimental data. Flexural toughness indexes are also computed from the load-deflection curves. The results indicate that steel fiber mortar and ferrocement overlays show better post-cracking rigidity, a higher toughness index, and smaller crack widths compared to overlays of plain mortar or the original full-depth concrete section. They also indicate that, with a properly bonded overlay, the flexural strength of the original pavement can be achieved without distress at the interface.
10.14359/4589
SP146-08
H. Hammooud and A. E. Naaman
An experimental program was carried out to investigate the behavior of ferrocement bolted moment-resisting joints. Eighteen ferrocement moment joints and four control ferrocement plates were tested under third-point flexural loading. The moment joints were fabricated by joining two L-shaped ferrocement elements with bolts. The parameters investigated were the number of mesh layers, the corner distance of the first bolt, the number of bolts, and the moment modes (closing corner and opening corner modes). Results describing the load-deformation response as well as the failure mode are presented. As expected, the joints failed by premature cracking along the corner section of the L-shaped elements. The bending capacity of the joint ranged from 36 to 90 percent of that of the control plates, depending on the test parameters. The joint performance was improved by more than 50 percent when a fillet was added, and the failure crack was moved from the corner to one of the legs. The fillet was more effective for the elements subjected to the opening mode moment than the closing mode moment.
10.14359/4590
SP146-10
J. D. Worner and M. Muller
A methodology is presented that allows calculation of plain and fiber reinforced concrete for moments and normal forces. The developed procedure is a simple method to derive the internal forces, crack width, effective stiffness, and toughness. The basis for verification of the proposed analytical procedure comprises broad parametric experimental studies that include variations of the fiber diameter, fiber length, fiber content, and depth of the specimen. Interaction diagrams are given for practical use.
10.14359/4591
SP146-02
P. Balaguru
Results of an experimental investigation on the behavior of a cement composite reinforced with short (micro) fibers are presented. The primary response variable was flexural behavior measured in terms of modulus of rupture and toughness index. The independent variables were fiber content, addition of silica fume, cement, sand ratio, specimen size, and casting procedure. Most of the specimens were cast using a shotcreting process. The results indicate the following trends. The microfibers can be used to increase flexural strength in rich cement mortars. The fibers do not provide significant strength increase, but do provide improved ductility. The addition of silica fume improves the fiber performance. Fibers are more effective in thinner sections. The author believes that the properties of the composite can be considerably improved by removing the excess water and entrapped air by applying external pressure during the manufacturing process.
10.14359/4322
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