Statistical variations in impact resistance of steel fiber-reinforced concrete subjected to drop weight test

Nataraja, M. C.; Dhang, Nirjhar; Gupta, Akhilesh

doi:10.1016/s0008-8846(99)00052-6

Cited by 119 publications

(51 citation statements)

References 1 publication

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“…As a result of that, the standard deviation of PC slabs were markedly large, as shown in Table 4, it means that the coefficient of variation (COV) of this material is quite high. This phenomenon has been also reported previously in (26), where the COV of PC elements was even up to 51% under drop-weight impact test. Yet, the impact resistance results of PC barely had a normal distribution under the statistical and experimental analysis (27).…”

Section: Comparative Ratio Of Hcc With Pc and Frc Slabs In Terms Of Isupporting

confidence: 89%

Performance of hybrid cement composite elements under drop-weight impact load

Nguyen¹,

Río²,

Sánchez‐Gálvez³

2014

Mater. construcc.

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ABSTRACT:The performance, under drop-weight impact load, of hybrid cement composite (HCC) elements, consisting of a top layer of plain concrete (PC) and a bottom layer of fibre reinforced concrete (FRC), in comparison with full-depth FRC and PC was studied. Apart from improving the tensile capacity of PC and saving fibre steel reinforcements of FRC, the results showed that HCC can effectively control the deformations and enhance the impact performance of the structural members as its outcomes were similar to that of a full-depth FRC. The analytical studies using Hughes empirical formulae (HEF) and yield line theory (YLT) adopted to investigate the practical use of HCC showed that they are applicable for design such HCC elements against impacts. KEYWORDS: RESUMEN:Comportamiento de elementos estructurales de compuestos híbridos base cemento frente a impacto de torre de caída. Se estudió el comportamiento, frente a impacto de torre de caída, de elementos híbridos base cemento (HCC), formados por una capa superior de hormigón en masa (PC) y una capa inferior de hormigón reforzado con fibras (FRC) en comparación con elementos análogos íntegramente fabricados con FRC y PC. Además de proporcionar una mejora en la resistencia frente a flexo-tracción de los PC y un ahorro en refuerzo usando fibras de acero en el caso de los FRC, los resultados mostraron que el HCC puede controlar eficazmente las deformaciones y mejorar el rendimiento frente a impacto de los elementos estructurales ya que sus resultados fueron análogos a la de los FRC. Los estudios analíticos, utilizando HEF e YLT, adoptados para investigar el uso práctico de los HCC mostraron que los mismos son aplicables para el diseño de estos elementos frente a impacto.

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Section: Comparative Ratio Of Hcc With Pc and Frc Slabs In Terms Of Isupporting

confidence: 89%

Performance of hybrid cement composite elements under drop-weight impact load

Nguyen¹,

Río²,

Sánchez‐Gálvez³

2014

Mater. construcc.

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“…However, a wide rang of standard deviation is reported in the literature. Higher values of 59 and 66 were obtained by Nataraja et al [17] for steel fibre reinforced concretes, whereas Soroushian et al [18] reported lower value of 18 blows for carbon fibre reinforced composites.…”

Section: Impact Resistancementioning

confidence: 84%

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Badr

Ashour

Platten

2006

International Journal of Impact Engineering

127

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Impact resistance of polypropylene fibre-reinforced concrete was investigated using the repeated drop weight impact test recommended by ACI Committee 544. The results were analysed based on a statistical approach. The variation in results was examined within the same batch and between different batches. Statistical parameters were compared with reported variations in impact resistance of concrete composites reinforced with other types of fibres such as carbon and steel fibres. Statistical analysis indicated that the results obtained from this test had large variations and it is necessary to increase the number of replications to at least 40 specimens per concrete mix to assure an error below 10%. It is concluded that this test with its current procedures and recommendations should not be considered a reliable impact test. This study has highlighted the need for modifying this test in such a way as that increases its accuracy and reduces the large variation in results.

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“…Because the impact resistance of SFRC was strongly influenced by the fabrication process and the distribution of fibres [2], in this study, the uniform distribution of fibres was ensured so that balling of fibres can be avoided. First, the coarse and fine aggregates were mixed for 3 min, and then the cement and fly ash were added.…”

Section: Testing Methodsmentioning

confidence: 99%

Combined effect of steel fibres and steel rebars on impact resistance of high performance concrete

Chen

Ding

Azevedo

2011

J. Cent. South Univ. Technol.

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The impact properties of normal concrete (NC) and reinforced concrete (RC) specimens, steel fibre reinforced concrete (SFRC) specimens and RC+SFRC specimens with different steel fibre dosages were investigated with the drop-weight impact test recommended by ACI Committee 544. The results indicate that the number of blows to final failure is greatly increased by addition of steel fibres. Moreover, the combination of steel fibres and steel rebars demonstrates a significant positive composite effect on the impact resistance, which results in the improvement in impact toughness of concrete specimens. In the view of variation of impact test results, the two-parameter Weibull distribution was adopted to analyze the experimental data. It is proved that the probabilistic distributions of the blows to first crack and to final failure of six types of samples approximately follow two-parameter Weibull distribution.

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Statistical variations in impact resistance of steel fiber-reinforced concrete subjected to drop weight test

Cited by 119 publications

References 1 publication

Performance of hybrid cement composite elements under drop-weight impact load

Performance of hybrid cement composite elements under drop-weight impact load

Statistical variations in impact resistance of polypropylene fibre-reinforced concrete

Combined effect of steel fibres and steel rebars on impact resistance of high performance concrete

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