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Materials 2015, 8(9), 5877-5890; doi:10.3390/ma8095281

Drop-Weight Impact Test on U-Shape Concrete Specimens with Statistical and Regression Analyses

1
School of Civil Engineering, Tianjin University, Tianjin 300072, China
2
Key Laboratory of Coast Civil Structure Safety, Tianjin University, Ministry of Education, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 28 May 2015 / Revised: 21 August 2015 / Accepted: 25 August 2015 / Published: 3 September 2015
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Abstract

According to the principle and method of drop-weight impact test, the impact resistance of concrete was measured using self-designed U-shape specimens and a newly designed drop-weight impact test apparatus. A series of drop-weight impact tests were carried out with four different masses of drop hammers (0.875, 0.8, 0.675 and 0.5 kg). The test results show that the impact resistance results fail to follow a normal distribution. As expected, U-shaped specimens can predetermine the location of the cracks very well. It is also easy to record the cracks propagation during the test. The maximum of coefficient of variation in this study is 31.2%; it is lower than the values obtained from the American Concrete Institute (ACI) impact tests in the literature. By regression analysis, the linear relationship between the first-crack and ultimate failure impact resistance is good. It can suggested that a minimum number of specimens is required to reliably measure the properties of the material based on the observed levels of variation. View Full-Text
Keywords: U-shape specimen; concrete; drop-weight test; impact resistance; coefficient of variation; statistical analysis U-shape specimen; concrete; drop-weight test; impact resistance; coefficient of variation; statistical analysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhu, X.-C.; Zhu, H.; Li, H.-R. Drop-Weight Impact Test on U-Shape Concrete Specimens with Statistical and Regression Analyses. Materials 2015, 8, 5877-5890.

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