There are many factors that affect the bonding and anchoring performance of epoxy resin coated steel bars.

mainly includes:   

1. Effect of coating thickness: When the diameter of the steel bar is different, the larger the rib diameter and the thicker the coating, the greater the decrease in bond strength.

2. The influence of the shape of the steel bar: The bonding and anchoring performance of the coated steel bar changes with the angle between the rib and the axis of the steel bar and the steepness of the thread.

3. The effect of the thickness of the concrete protective layer: the increase of the thickness of the protective layer also increases the bonding and anchoring performance.

4. The influence of epoxy resin-coated steel bar bending shape: those with hooks or bent are better than straight bars.

5. The strength of concrete and the influence of the constraints of stirrups: As the strength of concrete increases, its bonding and anchoring performance improves. The bond strength of epoxy resin coated steel bars is proportional to the square root of concrete strength; in addition, epoxy resin with stirrup constraints The bond strength of the coated steel bars is significantly improved compared to the absence of stirrups.

The bond anchorage strength of epoxy resin-coated steel bars is about 10% lower than that of uncoated steel bars under normal conditions, and under the most unfavorable conditions, the reduction is not more than 20%. Therefore, in order to ensure the bond strength between the coated steel bar and the concrete, the anchor length of the coated steel bar needs to be increased by a certain value, and increasing the anchor length will inevitably increase the cost of raw materials. Under normal circumstances, the reserved anchor length is 25% higher than that of ordinary steel bars.

The increased construction and labor costs of epoxy resin-coated steel bars account for about 25% of the total project cost. The one-time investment is very large, but epoxy resin-coated steel bars can effectively prevent the corrosion of steel bars and can effectively reduce the use period. Maintenance management costs, and extended the service life of the structure for more than 20 years, so from the perspective of cost-benefit analysis, it still has very good economic and social benefits, especially the structure in a corrosive environment, the application of epoxy resin coating Reinforcement technology, its economic and social benefits are very huge.