Types of concrete additives and their applications

Ismail Saad
March 23, 2021

In the construction sector, many technical solutions are used to facilitate and optimize the processes of elaboration of large-scale works. In this sense, the concrete admixture Malaysia has undoubtedly been one of those materials that cannot be absent due to its great potential and flexibility for the construction of all types of buildings.

Functions of the Concrete Additive

Generally speaking, concrete admixtures are liquid chemical compositions intended to be added to the water – cement mix, to reduce oxidation of the concrete, improve its setting time, or even to create new aesthetic effects.

Additives for Concrete, Mortar and Pastes. According to the standard. It defines them as: Product incorporated at the time of mixing the concrete in an amount not greater than 5% by mass, in relation to the cement content in the concrete, in order to modify the properties of the mixture in fresh and / or hardened.

In recent years, a large number of UNE standards have been completed, including the classification of said additives. 

The most widely used are:

Water reducers (fluidizers): those whose main function is to reduce the water content for a given workability, increase workability for the same water content without producing segregation or obtain both effects simultaneously.

Superfluidificantes (Superplastificantes): defined with the same effects as the previous ones, but with more considerable characteristics.

Setting accelerators: whose main function is to reduce or advance the setting time of cement (beginning and end), which is found in concrete, mortar or paste.

Setting retarders: those that delay the setting time (beginning and end) of cement, which is found in concrete, mortar or paste.

Hardening accelerators: used to increase or accelerate the development of the initial strengths of concrete, mortar or pastes.

Water-repellent (Water repellants): whose main function is to reduce the capillary absorption capacity or the amount of water that passes through a concrete, mortar or paste, saturated and subjected to a hydraulic gradient.

In addition to others such as: Air inclusors, gas generators, foam generators, deaerators or defoamers, expansion generators, pumping additives, additives for concrete and sprayed mortars, injection additives, colorants, corrosion inhibitors and reaction modifiers alkali-aggregates. For more articles like this one, click here.