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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 22 Abstracts search results
Document:
SP124-14
Date:
September 1, 1990
Author(s):
Mohsen Rahimi and H. T. Cao
Publication:
Symposium Papers
Volume:
124
Abstract:
Flexural behavior of sandwich beams reinforced with thin layers of steel-fiber reinforced mortar was studied in this investigation. The effect of variations in thickness of the reinforced layer on the modulus of rupture, Young's modulus, and toughness of the member was investigated. This investigation considered one single specimen size with fiber reinforced mortar using one fiber geometry and content. Steel fibers with 0.6 x 0.3 mm cross section and 18 mm long were used. The specimens were cast in 100 x 100 x 350 mm molds. Eight series of sandwich beams with different thicknesses of the reinforced layer were tested. Experimental results indicated that sandwich beams can have strength and toughness comparable to fully fiber reinforced beams. The minimum thickness of the fiber reinforced layer required to impart ductile behavior to the sandwich beam was found to be about one-sixth of the beam depth.
DOI:
10.14359/2797
SP124-15
S. K. Kaushik, R. M. Vasan, P. N. Godbole, D. C. Goel, and S. K. Khanna
Reports on the performance of semi-full scale pavement and overlay slabs under static loads. The test results of 60 mm SFRC pavement slabs having 0.5 percent fibers by volume have been presented under different loading and subgrade conditions. The test results of 100 mm PCC (plain cement concrete) pavement slab resting over a well-compacted subgrade have also been presented. The performance of 201 mm ferro-fibro overlay cast over 60mm cracked SFRC pavement has been reported and compared with a 40 mm SFRC overlay slab cast over 60 mm SFRC pavement. The experimental results of semi-full scale overlay and pavement slabs have been validated by infinite element analysis, a numerical technique developed for the analysis of unlimited domain of a layered system consisting of an overlay, pavement and subgrade of known properties. A comparative study has been presented with respect to Ferro-fibro and SFRC overlays.
10.14359/2806
SP124-16
T. P. Tassios and V. Karaouli
A simplified analytical procedure is proposed to predict stress-strain diagram of ferrocement composites under tension. A fracture mechanics approach is used to predict the load at first cracking. Results of a limited experimental investigation are also shown and used to evaluate the analytical model. The influence of curing is also demonstrated experimentally.
10.14359/2814
SP124-17
R. N. Swamy and M. W. Hussin
Presents comprehensive test data on the flexural strength, deflection, and cracking behavior of thin sheets of 6 to 13 mm thickness reinforced with a wide range of reinforcing elements. Two different sizes of sheets were generally tested under four-point loading, and in the case of glass fibers, a further small laboratory scale test specimen was also tested. Five different types of reinforcing elements were used: steel fibers, welded steel mesh without and with steel fibers, two types of woven polypropylene fabrics and glass fibers. The matrix was designed for durability and high workability with low water-binder ratio and a superplasticizer. In addition, 50 to 70 percent of the portland cement was replaced by fly ash. Extensive test data are presented and compared in terms of limit proportionality, modulus of rupture and cracking. It is shown that a wide range of reinforcement elements can be successfully used for thin sheet applications, and that the performance characteristics of thin sheets are very much a function of the type, geometry, and volume fraction of the reinforcement.
10.14359/2821
SP124-18
R. N. Swamy and Y. B. I. Shaheen
Presents comprehensive test data on the tensile behavior of 12.5 cm thick ferrocement plates. The main variables investigated were mesh geometry, specific surface, volume fraction, mesh yield strength and skeletal bars. The specimens were specially designed to insure failure in the gage length. The matrix was proportioned for high strength, high workability, and high durability with low water-to-binder ratio, and 50 percent fly ash replacement. Cracking and deformation were monitored throughout the loading range. The results showed that the composite properties of elastic modulus and ultimate tensile strength could be satisfactorily predicted. However, the cracking behavior for a wide range of mesh geometry could not be satisfactorily predicted by a single unique relationship. There was, however, good correlation between the composite properties of ultimate tensile strength and ultimate flexural strength. The results show that by suitable design of the matrix and the reinforcement, high-strength, ferrocement sheets with high crack resistance can be developed for a variety of structural applications.
10.14359/2828
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