Abstract
The adhesion strength between epoxy resin coatings and concrete substrates plays a pivotal role in ensuring the durability and performance of various structures, particularly in the construction industry. In this original study, we investigate the impact of different surface texturing methods on the pull-off strength of epoxy resin coatings applied to concrete substrates. A total of seventeen texturing methods were evaluated, including grooving, imprinting, patch grabbing, and brushing. The concrete substrates were prepared using standard mixtures, and the epoxy resin coatings were applied after 28 days of substrate curing. Pull-off strength tests were conducted using an automatic adhesion Tester, and the results were compared with industry standards and manufacturer recommendations.
Introduction
With the expanding construction industry and the increasing demand for durable flooring solutions, epoxy resin coatings have emerged as popular choices for concrete surface treatments. These coatings offer high chemical and mechanical resistance, ease of cleaning, and enhanced durability. However, achieving optimal adhesion between the epoxy resin and concrete substrate is essential to ensure long-term performance. Traditional surface preparation methods, such as grinding and applying bonding agents, can be labor-intensive and costly. Therefore, exploring alternative approaches to enhance adhesion without compromising performance is crucial.
Methodology
Concrete substrate samples were prepared using standard mixtures, and various surface texturing methods were applied, including grooving, imprinting, patch grabbing, and brushing. The epoxy resin coatings were then applied to the textured surfaces after 28 days of substrate curing. Pull-off strength tests were conducted using an automatic adhesion Tester, and the results were analyzed to evaluate the effectiveness of different texturing methods.
Results and Discussion
The study revealed that certain texturing methods, such as imprinting with cross spacers, significantly enhanced the pull-off strength of epoxy resin coatings compared to traditional grinding methods. Brushing with a painting brush also showed promising results, demonstrating that simple texturing techniques could replace complex surface preparation procedures. Additionally, the thickness of the detached concrete substrate surface was found to influence the adhesion strength, with an optimal thickness of around 12 mm yielding the best results.
Conclusion
The findings of this study suggest that surface texturing of concrete substrates offers a viable alternative to traditional surface preparation methods for enhancing the adhesion of epoxy resin coatings. Imprinting and brushing emerged as effective texturing techniques, providing comparable or even superior adhesion strength compared to grinding. These findings have implications for the construction industry, offering cost-effective and efficient solutions for achieving durable epoxy resin coatings on concrete substrates. Further research is warranted to explore the potential of modified epoxy resin formulations combined with optimized surface texturing methods to further improve adhesion strength and overall performance.
