Additives need to be used in concrete

March 25, 2021 - 3 minutes read

Classic concrete, consisting of cement, water and aggregate, is not always suitable for the job. The reason for this may be weather conditions, as well as the specifics of structures and their further operation.

Applying construction chemicals can radically change the situation. For example, adapt the mixture for the cold season or surfaces prone to deformation.

Antifreeze additives

Perhaps one of the most popular chemicals. The climatic features of most regions of our country do not allow construction projects to continue all year round without taking appropriate measures. You need to regulate to the situation.

At subzero temperatures, the water contained in the solution freezes and does not enter into the reaction necessary to obtain concrete. Moreover, it can freeze already at the stage of transportation.

To prevent crystallization of water, substances are added to the mixture that increase its temperature.

Restriction for the use of antifreeze additives: relative humidity exceeding 60%, rain.

Plasticizers

Additives that make the mixture mobile, flowable, and therefore increase the ease of handling. They are relevant in situations where it is required to lay thick, hard concrete of the P2 or P3 grades with a low water content in the solution. Such material is required, for example, when pouring a foundation and other monolithic works.

The fact is that a large amount of water in the cement mixture negatively affects the strength: the risk of cracks increases, frost resistance worsens. In a number of situations, this is completely contraindicated.

At the same time, hard, slow-moving concrete is difficult to lay tightly and efficiently, especially if the formwork has a complex shape. To improve plasticity, use special vibration equipment or chemical additives.

Plasticizers are the easiest way to increase the fluidity of a cement slurry without compromising its quality.

Waterproofing additives

Additives to improve the water resistance grade of concrete. They often combine other properties: increased plasticity, frost resistance, etc.

One of the most effective types of waterproofing drymix mortar additives Malaysia is bridging. They reduce the ability of concrete to pass water due to special chemical compounds. When the cement mixture hardens, the additives also begin to react, forming crystals in the pores that are insoluble in water and resistant to a number of aggressive media.

The voids in the concrete structure are filled, leaving no room for water.

As a result, such waterproofing protects not only from the ingress of liquids into the thickness of the material, but also from destruction when they freeze. For more articles related to this one, click here.