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B C Sheu - One of the best experts on this subject based on the ideXlab platform.

  • Statistical analysis of impact strength and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete
    Construction and Building Materials, 2005
    Co-Authors: P. -s. Song, S Y Hwang, B C Sheu
    Abstract:

    Abstract This paper statistically investigates the first-crack strength, failure strength, and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete in comparison with the steel Fiber-Reinforced Concrete. The former strengths were measured using the drop-weight test in a batch of 48 discs. The hybrid Fiber-Reinforced Concrete showed smaller variation in the two strengths, although larger scatter in the percentage increase was observed in the number of post-first-crack blows, compared to those of the steel Fiber-Reinforced Concrete. The Kolmogorov–Smirnov test indicates that the two Fiber-Reinforced Concretes hardly followed the normal distributions on the two strengths and the percentage increase. Dunnet’s calculations indicate that the hybrid Fiber-Reinforced Concrete provides less significant improvement on the two strengths and the percentage increase than the steel Fiber-Reinforced Concrete. The Kaplan–Meier analysis indicates that the hybrid Fiber-Reinforced Concrete improves a little higher reliabilities of the first-crack and failure strengths than the steel Fiber-Reinforced Concrete. A bi-role failure strength regression model is recommended for the two Concretes.

  • Impact Resistance of Polypropylene Fiber-Reinforced Concrete
    2003
    Co-Authors: Shin Hwang, Peyshiuan Song, B C Sheu
    Abstract:

    This paper investigated the impact resistance improving properties of polypropylene Fibers in normal strength Concrete. The impact resistance of polypropylene Fiber-Reinforced Concrete and normal strength Concrete was measured by using a drop-weight test and analyzed by using statistical procedures. The first-crack strength of the polypropylene Fiber-Reinforced Concrete had a mean of 188 blows, a coefficient of variation of 35%, and a 95% confidence interval of 166 to 210 blows, compared to 168 blows, 36%, and 146 to 190 blows for that of the normal strength Concrete. The failure strength of the polypropylene Fiber-Reinforced Concrete had a mean of 207 blows, a coefficient of variation of 32%, and a 95% confidence interval of 185 to 229 blows, as opposed to 177 blows, 34%, and 155 to 189 blows for that of the normal strength Concrete. The Kolmogorov-Smirnov test with significance level 0.05 indicates that both types of Concrete approximately followed normal distributions in the first-crack and failure strengths, and in the percentage increase in number of post-first-crack blows. Finally, prediction models were established for both Concretes, which predict the number of blows for failure strength and the related 95% confidence interval.

Peyshiuan Song - One of the best experts on this subject based on the ideXlab platform.

  • mechanical properties of polypropylene hybrid Fiber Reinforced Concrete
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Machine Hsie, Peyshiuan Song
    Abstract:

    This paper investigates the mechanical properties of polypropylene hybrid Fiber-Reinforced Concrete. There are two forms of polypropylene Fibers including coarse monofilament, and staple Fibers. The content of the former is at 3 kg/m3, 6 kg/m3, and 9 kg/m3, and the content of the latter is at 0.6 kg/m3. The experimental results show that the compressive strength, splitting tensile strength, and flexural properties of the polypropylene hybrid Fiber-Reinforced Concrete are better than the properties of single Fiber-Reinforced Concrete. These two forms of Fibers work complementarily. The staple Fibers have good fineness and dispersion so they can restrain the cracks in primary stage. The monofilament Fibers have high elastic modulus and stiffness. When the monofilament Fiber content is high enough, it is similar to the function of steel Fiber. Therefore, they can take more stress during destruction. In addition, hybrid Fibers disperse throughout Concrete, and they are bond with mixture well, so the polypropylene hybrid Fiber-Reinforced Concrete can effectively decrease drying shrinkage strain.

  • Impact Resistance of Polypropylene Fiber-Reinforced Concrete
    2003
    Co-Authors: Shin Hwang, Peyshiuan Song, B C Sheu
    Abstract:

    This paper investigated the impact resistance improving properties of polypropylene Fibers in normal strength Concrete. The impact resistance of polypropylene Fiber-Reinforced Concrete and normal strength Concrete was measured by using a drop-weight test and analyzed by using statistical procedures. The first-crack strength of the polypropylene Fiber-Reinforced Concrete had a mean of 188 blows, a coefficient of variation of 35%, and a 95% confidence interval of 166 to 210 blows, compared to 168 blows, 36%, and 146 to 190 blows for that of the normal strength Concrete. The failure strength of the polypropylene Fiber-Reinforced Concrete had a mean of 207 blows, a coefficient of variation of 32%, and a 95% confidence interval of 185 to 229 blows, as opposed to 177 blows, 34%, and 155 to 189 blows for that of the normal strength Concrete. The Kolmogorov-Smirnov test with significance level 0.05 indicates that both types of Concrete approximately followed normal distributions in the first-crack and failure strengths, and in the percentage increase in number of post-first-crack blows. Finally, prediction models were established for both Concretes, which predict the number of blows for failure strength and the related 95% confidence interval.

P. -s. Song - One of the best experts on this subject based on the ideXlab platform.

  • Statistical analysis of impact strength and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete
    Construction and Building Materials, 2005
    Co-Authors: P. -s. Song, S Y Hwang, B C Sheu
    Abstract:

    Abstract This paper statistically investigates the first-crack strength, failure strength, and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete in comparison with the steel Fiber-Reinforced Concrete. The former strengths were measured using the drop-weight test in a batch of 48 discs. The hybrid Fiber-Reinforced Concrete showed smaller variation in the two strengths, although larger scatter in the percentage increase was observed in the number of post-first-crack blows, compared to those of the steel Fiber-Reinforced Concrete. The Kolmogorov–Smirnov test indicates that the two Fiber-Reinforced Concretes hardly followed the normal distributions on the two strengths and the percentage increase. Dunnet’s calculations indicate that the hybrid Fiber-Reinforced Concrete provides less significant improvement on the two strengths and the percentage increase than the steel Fiber-Reinforced Concrete. The Kaplan–Meier analysis indicates that the hybrid Fiber-Reinforced Concrete improves a little higher reliabilities of the first-crack and failure strengths than the steel Fiber-Reinforced Concrete. A bi-role failure strength regression model is recommended for the two Concretes.

  • mechanical properties of high strength steel Fiber Reinforced Concrete
    Construction and Building Materials, 2004
    Co-Authors: P. -s. Song, S Y Hwang
    Abstract:

    Abstract The marked brittleness with low tensile strength and strain capacities of high-strength Concrete (HSC) can be overcome by the addition of steel Fibers. This paper investigated the mechanical properties of high-strength steel Fiber-Reinforced Concrete. The properties included compressive and splitting tensile strengths, modulus of rupture, and toughness index. The steel Fibers were added at the volume fractions of 0.5%, 1.0%, 1.5%, and 2.0%. The compressive strength of the Fiber-Reinforced Concrete reached a maximum at 1.5% volume fraction, being a 15.3% improvement over the HSC. The splitting tensile strength and modulus of rupture of the Fiber-Reinforced Concrete improved with increasing the volume fraction, achieving 98.3% and 126.6% improvements, respectively, at 2.0% volume fraction. The toughness index of the Fiber-Reinforced Concrete improved with increasing the fraction. The indexes I 5 , I 10 , and I 30 registered values of 6.5, 11.8, and 20.6, respectively, at 2.0% fraction. Strength models were established to predict the compressive and splitting tensile strengths and modulus of rupture of the Fiber-Reinforced Concrete. The models give predictions matching the measurements.

S Y Hwang - One of the best experts on this subject based on the ideXlab platform.

  • Statistical analysis of impact strength and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete
    Construction and Building Materials, 2005
    Co-Authors: P. -s. Song, S Y Hwang, B C Sheu
    Abstract:

    Abstract This paper statistically investigates the first-crack strength, failure strength, and strength reliability of steel–polypropylene hybrid Fiber-Reinforced Concrete in comparison with the steel Fiber-Reinforced Concrete. The former strengths were measured using the drop-weight test in a batch of 48 discs. The hybrid Fiber-Reinforced Concrete showed smaller variation in the two strengths, although larger scatter in the percentage increase was observed in the number of post-first-crack blows, compared to those of the steel Fiber-Reinforced Concrete. The Kolmogorov–Smirnov test indicates that the two Fiber-Reinforced Concretes hardly followed the normal distributions on the two strengths and the percentage increase. Dunnet’s calculations indicate that the hybrid Fiber-Reinforced Concrete provides less significant improvement on the two strengths and the percentage increase than the steel Fiber-Reinforced Concrete. The Kaplan–Meier analysis indicates that the hybrid Fiber-Reinforced Concrete improves a little higher reliabilities of the first-crack and failure strengths than the steel Fiber-Reinforced Concrete. A bi-role failure strength regression model is recommended for the two Concretes.

  • mechanical properties of high strength steel Fiber Reinforced Concrete
    Construction and Building Materials, 2004
    Co-Authors: P. -s. Song, S Y Hwang
    Abstract:

    Abstract The marked brittleness with low tensile strength and strain capacities of high-strength Concrete (HSC) can be overcome by the addition of steel Fibers. This paper investigated the mechanical properties of high-strength steel Fiber-Reinforced Concrete. The properties included compressive and splitting tensile strengths, modulus of rupture, and toughness index. The steel Fibers were added at the volume fractions of 0.5%, 1.0%, 1.5%, and 2.0%. The compressive strength of the Fiber-Reinforced Concrete reached a maximum at 1.5% volume fraction, being a 15.3% improvement over the HSC. The splitting tensile strength and modulus of rupture of the Fiber-Reinforced Concrete improved with increasing the volume fraction, achieving 98.3% and 126.6% improvements, respectively, at 2.0% volume fraction. The toughness index of the Fiber-Reinforced Concrete improved with increasing the fraction. The indexes I 5 , I 10 , and I 30 registered values of 6.5, 11.8, and 20.6, respectively, at 2.0% fraction. Strength models were established to predict the compressive and splitting tensile strengths and modulus of rupture of the Fiber-Reinforced Concrete. The models give predictions matching the measurements.

Machine Hsie - One of the best experts on this subject based on the ideXlab platform.

  • mechanical properties of polypropylene hybrid Fiber Reinforced Concrete
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Machine Hsie, Peyshiuan Song
    Abstract:

    This paper investigates the mechanical properties of polypropylene hybrid Fiber-Reinforced Concrete. There are two forms of polypropylene Fibers including coarse monofilament, and staple Fibers. The content of the former is at 3 kg/m3, 6 kg/m3, and 9 kg/m3, and the content of the latter is at 0.6 kg/m3. The experimental results show that the compressive strength, splitting tensile strength, and flexural properties of the polypropylene hybrid Fiber-Reinforced Concrete are better than the properties of single Fiber-Reinforced Concrete. These two forms of Fibers work complementarily. The staple Fibers have good fineness and dispersion so they can restrain the cracks in primary stage. The monofilament Fibers have high elastic modulus and stiffness. When the monofilament Fiber content is high enough, it is similar to the function of steel Fiber. Therefore, they can take more stress during destruction. In addition, hybrid Fibers disperse throughout Concrete, and they are bond with mixture well, so the polypropylene hybrid Fiber-Reinforced Concrete can effectively decrease drying shrinkage strain.