ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
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:
SP146-02
Date:
June 1, 1994
Author(s):
P. Balaguru
Publication:
Symposium Papers
Volume:
146
Abstract:
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.
DOI:
10.14359/4322
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
SP146-09
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.
10.14359/4324
SP146-04
N. Banthia, A. Moncef, and J. Sheng
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.
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
Results Per Page 5 10 15 20 25 50 100
Edit Module Settings to define Page Content Reviewer