Chemical additives for concrete

Cement and concrete admixtures are construction chemicals that reliably enhance the sustainability of a wide range of cement-based systems. This improvement can originate from the improvement of durability and resistance through the reduction of water, and favoring the process of hydration of the cement to allow the replacement of the clinker with supplementary cementitious materials. Currently, different technologies are frequently used. Combinations of additives, especially in concrete systems that incorporate secondary cementitious materials (SCMs), where both water reduction and chemistry are used that favor the hydration reaction of the cement to allow a greater inclusion of SCMs while maintaining strength specified.

Adaptation of additives to new cementitious systems.

The innovative use of chemical for ready mix concrete Malaysia, for example calcareous calcined clay and the development of new clinker, are important technologies to achieve the sustainability goal of cement-based materials. To achieve maximum sustainability, its use must be accompanied by additives, particularly in cases where it is required to minimize the use of water.

The increased use of various raw materials in the production of concrete, whether as cementitious materials, aggregates or additives, can inevitably create complex interaction effects. In the most severe cases, these negative interactions can lead to the production of green concrete that will not set, or weak concrete, which has a poor microstructure and a short service life. Provided these obstacles are avoided, sustainable concrete production (i.e. a net reduction in CO2 emissions over the life cycle of a structure) can be achieved through (1) a reduction in cement used, (2) a reduction of mixing and / or placement energy, and (3) an increase in the durability of the concrete structure.

To make concrete more sustainable, some of the procedures must be tailored to the specific locations of use, and this depends on the infrastructure and transportation capabilities available to and from the job site. In places where bulk cement is used, for example in urban ready-mix concrete plants, chemicals are added in the cement grinding and concrete mixing processes. Therefore, it is important to take into account all the chemicals that enter the final concrete. In contrast, in locations where bagged cements are typically supplied. For more articles like this one, click here.

Written by Jason Hansen