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International Concrete Abstracts Portal

Showing 1-5 of 12 Abstracts search results

Document: 

SP190-03

Date: 

April 1, 2000

Author(s):

Yixin Shao, Ramesh Srinivasan and Surendra P. Shah

Publication:

Symposium Papers

Volume:

190

Abstract:

The effect of material constituents on the performance of fiber reinforced cementitious thin sheets was studied in order to examine the possible trade-off between cost and performance in cement-based building product development. A variety of materials were incorporated into fabricating cementitious thin sheets. The variables included types of fibers (glass, polyethylene terephthalate, polyolefin, or polyvinyl alcohol), types of sand (marble, silica or fly ash) and percent content, mixing method (dispersive or non-dispersive), latex types (MMA or SB), cement types (Type I or Type III), mineral additives (metakaolin or silica fume) and curing conditions (moisture or steam). Twelve batches of thin sheets with 3% fibers by volume for each were prepared by extrusion processing and three-point bending tests were conducted to evaluate the strength and toughness. The purpose of the study was to establish several mix designs for extrusion production of high performance fiber reinforced cementitious thin sheets at compatible cost.

DOI:

10.14359/5720


Document: 

SP190-05

Date: 

April 1, 2000

Author(s):

Hans W. Reinhardt

Publication:

Symposium Papers

Volume:

190

Abstract:

Panels were made of concrete and glass rovings for use as integral (or permanent) formwork for reinforced concrete. Extensive testing has been carried out in order to check bending strength, durability, composite action, and fire resistance of the panels either in the stage of the construction process or after completion of the structure. The test results are described and discussed. The final design of the formwork panel is presented.

DOI:

10.14359/5722


Document: 

SP190-10

Date: 

April 1, 2000

Author(s):

K. Imai, M. Hayashi, T. Tamaki, and H. Tanaka

Publication:

Symposium Papers

Volume:

190

Abstract:

The use of GFRC using the low shrinkage, low alkaline cement for GFRC (CGC) in construction projects has recently been increasing in Japan because of its high durability of bending strength and its excellent dimensional stability. In the case of GFRC using CGC, however, rather strict steam curing condi-tion is necessary when it is manufactured. On the other hand in the case of GFRC using the super low contractile admixture (NSR), no special cure is necessary. NSR consists of calcium aluminate and inorganic sulfate. GFRC-NSR is composed of ordinary port-land cement, NSR and water-quenched blast furnace slag. GFRC-NSR also shows excellent bending strength and dimensional stability. This paper describes optimum mixture proportions of GFRC-NSR and various properties of GFRC-NSR such as bending strength after hot-water accelerated aging, bending strength after dry-wet cycles accelerated aging, drying shrinkage, change in length after dry-w-et cycles, freeze-thaw resis-tance, and pull-off strength of flex anchor.

DOI:

10.14359/5728


Document: 

SP190-08

Date: 

April 1, 2000

Author(s):

Penelope L. Burke and Surendra P. Shah

Publication:

Symposium Papers

Volume:

190

Abstract:

The durability of two extruded thin sheet PVA fiber reinforced cement composites were investigated. The baseline composition contained silica fume and the other replaced the silica fume in the baseline composition with OPC. Compositions were subjected to aging in a 50% relative humidity room, immersion in a 50?C waterbath, and exposure to freeze/thaw cycling. Samples were tested primarily in the saturated condition and less frequently in the dry condition. Strength and toughness values were obtained from 3-point flexural and notched tensile tests. The effects of aging, silica fume content, and testing condition were considered. Each composition, tested in both the saturated and dry conditions and tested for all types of aging, experienced similar trends: a decrease in flexural strength and flexural first crack stress, an increase in tensile strength and tensile first crack stress, and a decrease in toughness values. Although both the non-aged and aged specimens experienced fiber pull-out, the mechanism of bond failure appears to be different. The contribution of silica fume was not significant as far as durability is concerned. Strength increased with drying, and toughness generally decreased.

DOI:

10.14359/5725


Document: 

SP190-11

Date: 

April 1, 2000

Author(s):

P. Soroushian

Publication:

Symposium Papers

Volume:

190

Abstract:

This paper reviews the key effects of processed cellulous fibers at practi-cal dosage rates in cement-based mixtures of different cement contents and aggregate particle sizes, produced by normal casting or using different thin sheet processing systems. Mechanical characteristics, restrained plastic and drying shrinkage cracking attributes, and durability characteristics under dif-ferent accelerated aging conditions are investigated. Performance character-istics of processed cellulose fibers in thin sheet cement products subjected to . different processing systems are compared.

DOI:

10.14359/5729


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