What defects will appear in cast-in-place concrete of bridge? What is the reason? What method is used to detect?

1. The surface defects of reinforced concrete structures mainly include: honeycomb, pockmarked surface, exposed reinforcement, holes, layer gaps, wear, surface corrosion, aging, peeling, surface cracks, falling corners, distorted formwork, uneven joints, member deformation, etc.

There are many reasons for concrete surface defects, such as design, construction, maintenance, traffic accidents, earthquakes and structural aging. 2. Causes of internal defects.

The internal defects of bridges are mainly caused by the following reasons:

Design: The structural stress analysis is wrong, the reinforcement arrangement is improper, the structure is unreasonable, the calculation is wrong, and the drawings are incomplete, resulting in insufficient structural strength, poor stability and stiffness.

Improper construction: the construction quality is not good, the specifications and properties of materials used in construction do not meet the requirements, and the operation is illegal. Irregular steel binding, improper formwork support, too dense aggregate and false vibration.

External factors in operation: the increase of traffic volume, the increase of load, the influence of natural disasters such as earthquakes, floods and mudslides, and the erosion of seawater, sewage and chemicals.