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Drop-Weight Impact Test on U-Shape Concrete Specimens with Statistical and Regression Analyses.
Xue-Chao Zhu1, Han Zhu2,3, Hao-Ran Li4
1School of Civil Engineering, Tianjin University, Tianjin 300072, China. 1011205075@tju.edu.cn.
Materials (Basel, Switzerland)
|August 11, 2017
Summary
This study measured concrete impact resistance using novel U-shaped specimens and a drop-weight apparatus. Results indicate U-shaped specimens reliably predict crack locations, offering improved impact resistance testing.
Area of Science:
- Materials Science
- Civil Engineering
- Structural Analysis
Background:
- Assessing concrete's impact resistance is crucial for structural integrity.
- Traditional impact tests present challenges in crack localization and data variability.
- Developing standardized and reliable impact testing methods is an ongoing need.
Purpose of the Study:
- To evaluate the impact resistance of concrete using a novel U-shaped specimen design.
- To assess the efficacy of a newly developed drop-weight impact testing apparatus.
- To analyze the distribution and variability of impact resistance data.
Main Methods:
- Utilized self-designed U-shaped concrete specimens.
- Employed a newly designed drop-weight impact test apparatus.
- Conducted tests with four different drop hammer masses (0.875, 0.8, 0.675, 0.5 kg).
Main Results:
- Impact resistance data did not conform to a normal distribution.
- U-shaped specimens effectively predetermined crack locations and facilitated crack propagation recording.
- The maximum coefficient of variation (31.2%) was lower than reported American Concrete Institute (ACI) values.
- Regression analysis revealed a good linear relationship between first-crack and ultimate failure impact resistance.
Conclusions:
- The U-shaped specimen and drop-weight apparatus provide a reliable method for concrete impact resistance testing.
- The observed variability suggests a need to determine the minimum number of specimens for accurate material property assessment.
- The findings contribute to improving the standardization and accuracy of concrete impact testing protocols.
Keywords:
U-shape specimencoefficient of variationconcretedrop-weight testimpact resistancestatistical analysisMore Related Videos
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