Method for using iron oxide pigments in concrete

Concrete is a material widely used in building structures. In addition to its basic properties such as strength and durability, color has also become an important property. The addition of iron oxide pigments in concrete can make its color more bright and beautiful, and also improve the durability and resistance to weathering of the cement. The use of iron oxide pigments in concrete will be introduced in detail in this paper.

The type of iron oxide pigment

Iron oxide pigment is a widely used pigment in concrete, which is mainly divided into three types: red iron oxide pigment, yellow iron oxide pigment and black iron oxide pigment. Among them, red iron oxide pigments and yellow iron oxide pigments are the most widely used.

Selection of iron oxide pigments

Before using iron oxide pigments, it is necessary to select the appropriate color according to the specific engineering requirements and design requirements. Generally speaking, red iron oxide pigments are suitable for the facades of buildings and decorative walls, etc., and have good color stability under sunlight. Yellow iron oxide pigment is suitable for concrete in roads, squares and other places, which can make its color more vivid and bright. In the selection, also need to consider the durability and stability of iron oxide pigments.

The proportion of iron oxide pigment

When adding iron oxide pigments in concrete, it is necessary to match the proportion of concrete. Generally speaking, the amount of iron oxide pigment added is between 1-5% of the total weight of concrete, and the specific amount needs to be determined according to color requirements and concrete strength and other factors. When matching, it is necessary to pay attention to control the amount of pigment added to avoid too much or too little.

Method for using iron oxide pigments

A.Dry mixing method

Dry mixing method is a common method of adding iron oxide pigments in concrete, the specific steps are as follows:

a)the iron oxide pigments and cement, sand, stone and other mixed materials together dry mixing.

b)Add the mixed material into the concrete mixer, add water and mix to make concrete.

c)Surface treatment and other follow-up work as required.

B.Wet mixing method

Wet mixing method is a more common method of adding iron oxide pigments to concrete. The specific steps are as follows:

a)The iron oxide pigment and a certain proportion of water are mixed evenly to form a color paste.

b)Add the color paste to the concrete mixer, add cement, sand and other mixed materials together.

c)Surface treatment and other follow-up work as needed.

Matters need attention

a)In the selection and matching of iron oxide pigments, it is necessary to choose according to specific engineering requirements and design requirements to avoid color aberration and other problems.

b)When adding iron oxide pigment in concrete, it is necessary to control the amount of pigment added to avoid too much or too little.

c)When using dry mixing method or wet mixing method, it is necessary to ensure that the concrete is mixed evenly to avoid the problem of uneven color.

d)In the concrete construction process, attention should be paid to protecting the concrete surface to avoid problems such as scratches.

Summary

Iron oxide pigment is widely used in concrete pigments, can make the concrete color more bright and beautiful, but also can improve the durability and resistance to weathering of concrete. When using iron oxide pigments, it is necessary to choose according to specific engineering requirements and design requirements, and control the amount of pigments added to ensure the uniform and stable color of concrete.