Technical specification for the application of iron oxide pigments in concrete

Concrete iron oxide pigment is a common pigment that can bring different colors to concrete.

Iron oxide pigments can not only improve the aesthetics of concrete, but also improve the physical properties of concrete. Therefore, the application technical regulations of iron oxide pigments are of great significance for concrete engineering.

The type of iron oxide pigment

Iron oxide pigments are usually divided into red, yellow, black, brown and other colors. Among them, red iron oxide pigments are one of the most commonly used pigments, followed by yellow and black iron oxide pigments. Different iron oxide pigments have different effects on the properties of concrete.

Selection of iron oxide pigments

In the selection of iron oxide pigments, the following factors should be considered: color, stability, light resistance, heat resistance, acid and alkali resistance, cost, etc. At the same time, the appropriate iron oxide pigment should be selected according to the use environment and requirements of the coagulant.

Selection of iron oxide pigments

In the selection of iron oxide pigments, the following factors should be considered: color, stability, light resistance, heat resistance, acid and alkali resistance, cost, etc. At the same time, appropriate iron oxide pigments should be selected according to the use environment and requirements of concrete.

Amount of iron oxide pigment added

The amount of iron oxide pigment is usually calculated as a percentage of the total weight of the concrete. In general, the amount of red iron oxide pigment is added between 2% and 5%, the amount of yellow iron oxide pigment is added between 1% and 3%, and the amount of black iron oxide pigment is added between 3% and 6%.

Mixing of iron oxide pigments

Iron oxide pigments are generally mixed by dry mixing or wet mixing. In the case of dry mixing, iron oxide pigments should be mixed with cement, sand and aggregate to ensure even distribution of the pigments. In the case of wet mixing, iron oxide pigments should be mixed with water, and then mixed with cement, sand and aggregate.

Mixing of concrete

In the concrete mixing process, should pay attention to the following issues: mixing time, mixing speed, mixing order, mixing mode, etc. The mixing time is usually between 2 and 5 minutes, and the mixing speed should be gradually accelerated, and the mixing sequence should first add cement and sand, then add aggregate and pigment, and finally add the remaining water.

Concrete pouring and maintenance

In the process of concrete pouring and curing, the following problems should be paid attention to: pouring density, pouring speed, pouring uniformity, curing time, curing mode, etc. The pouring density should be uniform, the pouring speed should be moderate, the pouring uniformity should be controlled within +5mm, the curing time should be between 7 to 14 days, and the curing method should be selected according to the use environment and requirements of concrete.

Inspection of concrete

In the process of concrete inspection, inspection should be carried out according to national standards. The main inspection contents include: concrete strength, density, impermeability and durability. At the same time, the corresponding inspection method and index should be selected according to the use environment and requirements of concrete.

Summary

Iron oxide pigment has important application value in concrete engineering. In the use of iron oxide pigments, should be based on the use of concrete environment and requirements to choose the appropriate amount of pigments and additives. At the same time, attention should be paid to the process of concrete mixing, pouring and curing to ensure the quality and performance of concrete. In the process of concrete inspection, it should be inspected according to national standards to ensure the quality and safety of concrete.