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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:
SP146-09
Date:
June 1, 1994
Author(s):
P. Soroushian, S. Marikunte, and J. P. Won
Publication:
Symposium Papers
Volume:
146
Abstract:
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.
DOI:
10.14359/4324
SP146-06
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.
10.14359/4323
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
SP146-05
R. Siddique and J. Venkataramana
Thin natural fiber reinforced concrete sheets and tiles can be an inexpensive, attractive alternative to conventional roofing materials such as corrugated aluminum sheets, which are costly and energy-intensive in their production. Further production of such sheets may be done through intermediate technology, which does not rely much on heavy machinery and skilled labor. The present work aims at determining the suitability of San fiber, available in the Rjasthan state of India, for manufacturing thin fiber reinforced cement concrete sheets that can be used as roofing and paving tiles. For this purpose, 300 x 300 x 300-mm sheets, reinforced with randomly distributed discontinuous fibers, were tested for static load-carrying capacity and impact strength. The following conclusions are drawn, based on comparison with unreinforced cement concrete sheets. San fiber can be effectively used as a reinforcing material for sheets. Chopped fibers improve ductility, and impact strength is improved by about 23 to 29 percent, compared to unreinforced sheets. Overall indications are that San fiber can be used in the production of cost-effective roofing and paving material, compared to concrete reinforced with costlier fibers, such as steel.
10.14359/4616
SP146-03
P. Soroushian, Z. Shah, and S. Marikunte
Potential of wastepaper fibers for the reinforcement of thin-sheet cement products was investigated. The slurry-dewatering method followed by pressing was used to manufacture the products. The fiber reinforcement conditions, matrix mix composition, and processing variable were optimized through experimental studies and statistical analyses based on fractional factorial design of experiments and analyses of variance of results. The results are indicative of strong potentials for the recycling of wastepaper for the reinforcement of thin cement products.
10.14359/4615
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