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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
June 1, 1994
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.
P. Soroushian, S. Marikunte, and J. P. Won
A comprehensive experimental program based on the statistical concepts of fractional factorial design was conducted to investigate the effects of various mix variables on the physical properties of wood fiber reinforced cement composites. The variables investigated were fiber type, fiber content, pozzolanic admixture, and silica sand content. The composites were produced through slurry-dewatering, and effect of the preceding variables on the following properties were studied: specific gravity, water absorption, and moisture movement.
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.
H. J. Molloy, J. Jones, and T. G. Harmon
Presents results of a development program to improve the properties of glass fiber reinforced concrete (GFRC). The current system is composed of portland cement, silica sand, 5 percent alkali-resistant glass, curing agent (5 percent acrylic copolymer solids by weight of cement), and a water-cement ratio of 0.32. Historically, this system has resulted in loss of some ductility due to the development of calcium hydroxide, which bonds the individual filaments together in the strand, reducing their reinforcing efficiency. A new system was developed to improve the performance of the composite. This system is composed of rapid-hardening hydraulic cement, silica fume, and additives to combine with any free lime, provide enhanced workability, and a degree of retardation, using a water-cement ratio of 0.45 and 5 percent alkali-resistant glass containing 20 percent zirconium oxide. Polymer curing agents are not recommended. The durability of the system was tested using the glass industry test of immersing the product in hot water (60 C) for up to 100 days and periodically measuring the flexural strength and strain capacity using ASTM C 947-89. Analysis of the results indicates a very high retention of both flexural strength and strain capacity for the new system, after being exposed to the hot water aging test.
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.
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