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

Materials

Xue-Chao Zhu¹  Han Zhu¹  Hao-Ran Li¹ 

[1] School of Civil Engineering, Tianjin University, Tianjin 300072, China; E-Mails:

关键词: U-shape specimen;    concrete;    drop-weight test;    impact resistance;    coefficient of variation;    statistical analysis;   

DOI  :  10.3390/ma8095281

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.