In recent years, transportation lines and construction projects have developed rapidly, and concrete plays an important role in them. The requirements for concrete quality are also getting higher and higher. As the service life increases, concrete will also appear cracks, potholes, etc. Various quality problems, these quality defects will affect the service life of concrete. If no measures are taken for repair and maintenance, it is easy to cause major accidents over time.

The temperature distribution on the surface of the concrete structure has a great relationship with the temperature distribution inside the concrete structure. Defects within the concrete structure will affect the temperature distribution on the surface of the concrete structure. The surface of the concrete structure is inspected through an infrared thermal imaging camera. The temperature data obtained can reflect whether there are quality problems in the internal structure of the concrete.

What are the applications of infrared thermal imaging cameras in concrete quality inspection?

1. There are hollows inside the concrete structure or the pouring is not dense.

Use the difference in heat capacity and thermal conductivity between defective and intact concrete to detect defects such as concrete cracks, looseness, and voids;

2. Concrete leakage detection

The water content of the concrete at the leakage point is relatively high, and the influence of water on the heat capacity and thermal conductivity of the concrete is used to detect hidden leakage points;

3. Internal losses of concrete after fire

After concrete is exposed to fire, a series of different physical and chemical reactions will occur under the action of high temperature. For example, the phase change of cement stone and aggregate, the increase of cracks, the loose and porous structure, the cracking and disconnection of cement stone aggregate interface, etc., make the concrete gradually loosen and crack from the outside to the inside. This causes varying degrees of damage to various properties of the structure itself, resulting in a decrease in the thermal conductivity of concrete, thus affecting the surface temperature distribution of the object. Thermal imaging cameras can be used to detect internal damage after a concrete fire.

4. Steel embedded parts inside concrete

The heat transfer coefficient of steel is large, heat conduction is fast, and temperature rises quickly, which can also cause differences in surface temperature of the structure.

5. Thermal insulation and air tightness of concrete structures

The thermal conductivity of air is lower than that of concrete to detect the bonding quality of concrete beams with steel, carbon fiber cloth or building exterior wall facings.

What are the advantages of using infrared thermal imaging cameras for concrete quality inspection?

1. The infrared thermal imaging camera is a non-contact detection tool and will not damage the original structure of concrete;

2. It can detect large areas quickly, greatly improving the efficiency of detection.

3. High sensitivity, can detect subtle temperature differences

4. The detection distance is long, and it is also suitable for some long-distance and high-rise buildings.

Using infrared thermal imaging detection technology, concrete structures can be quickly and non-destructively inspected over a wide range, and defects in concrete can be initially assessed, including internal hollows and cracks in the concrete. Therefore, it can provide a scientific basis for the repair and reinforcement of buildings. It has broad application prospects in the inspection and maintenance of concrete structures.