PURPOSES : The aim of this study is to evaluate the stripping resistance of a bead coating via the Hamburg wheel tracking test and image analysis.
METHODS : First, the stripping resistance of the bead coating was evaluated via the Hamburg wheel tracking test. A pneumatic wheel with a load of 175±2 N was used to simulate repeated skid cycles. Several bead coating mixtures with different numbers of coating layers, i.e., zero, one, two, three, and four layers, i.e., zero, one, two, three, and four layers,were conducted. Finally, an image analysis program was developed to analyze surface images captured from the Hamburg wheel tracking test.
RESULTS : The results show that the samples with more coating layers exhibit higher stripping resistance. After 500 stripping cycles, the percentage of bead loss is 4% to 28%. At 80% bead loss, the mixture with one coating layer presents more skid cycles than the control sample without a coating layer.
CONCLUSIONS : Incorporating a coating layer can improve the stripping resistance of glass beads under repeated skid cycles. Additionally, an image analysis program is established in this study to determine the percentage of bead loss caused by the stripping test.

ABSTRACT
1. Introductuon
    1.1. Literature review
    1.2. Research contents
2. Materials – Sample preparation
    2.1 Materials
    2.2. Sample preparation
3. Test Methods
    3.1. Hamburg wheel tracking test
    3.2. Image analysis
4. Results-discussion
    4.1. Bead loss at 500 skid cycles
    4.2. Skid cycles at 80% bead loss
5. Conclusions
REFERENCES

• Kim Yeon-Tae(한국건설기술연구원 도로교통연구본부 전임연구원) | 김연태
• Nguyen Truong Anh(군산대학교 공과대학 토목환경공학과 석사과정생) | 응웬쯔엉아잉
• Phan Minh Tam(군산대학교 공과대학 토목환경공학과 박사과정생) | 반민담
• Park Dae-Wook(군산대학교 공과대학 토목공학과 교수) | 박대욱 Corresponding author