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International Concrete Abstracts Portal

Showing 1-5 of 11 Abstracts search results

Document: 

SP146-03

Date: 

June 1, 1994

Author(s):

P. Soroushian, Z. Shah, and S. Marikunte

Publication:

Symposium Papers

Volume:

146

Abstract:

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.

DOI:

10.14359/4615


Document: 

SP146-06

Date: 

June 1, 1994

Author(s):

H. J. Molloy, J. Jones, and T. G. Harmon

Publication:

Symposium Papers

Volume:

146

Abstract:

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.

DOI:

10.14359/4323


Document: 

SP146-01

Date: 

June 1, 1994

Author(s):

D. M. Gale

Publication:

Symposium Papers

Volume:

146

Abstract:

Since the turn of the century, thin-section asbestos-cement sheet and pipe products have been manufactured. Health and environmental concerns regarding the use of asbestos have led to a worldwide search for alternative fibers. Paper reviews the state of the art in using synthetic fibers to replace asbestos in fiber-cement products.

DOI:

10.14359/4614


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


Document: 

SP146-10

Date: 

June 1, 1994

Author(s):

J. D. Worner and M. Muller

Publication:

Symposium Papers

Volume:

146

Abstract:

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.

DOI:

10.14359/4591


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