concrete superplasticizer polycarboxylate superplasticizers are chemicals used in the preparation of ready-mixed concrete. They are highly effective in lowering the mix water requirement to produce high-strength and durable concrete.
They also improve workability, speed finishing, increase strength and conserve cement. In addition, they help to reduce shrinkage and thermal cracking.
Their chemical structure plays an important role in their performance in concrete mixtures. In particular, the anchoring group, main chain, side chain, molecular weight and molecular architecture of PCs influence their initial dispersibility and cement-binder interaction.
Usually, the adsorption capacity of PCs increases with their anchoring group content. However, the initial dispersibility of PCs can be affected when sulfate ions (SO42-) are present in cements.
The most common types of polycarboxylate superplasticizers include sulphonated melamine formaldehyde condensates (SMF), sulphonated naphthalene formaldehyde condensates and modified lignosulphonates (MLS). In addition, some admixtures contain other ingredients like carbohydrate esters or sulphonated acid esters.
These admixtures are usually supplied in powder form and can be mixed for 2-5 minutes to ensure that the required level of water reduction is achieved. They can be added to any ready-mixed concrete to achieve a higher slump retention and enhanced plasticity.
The market for concrete superplasticizers is projected to reach a major size and grow at the highest rate in the APAC region due to the increase in urbanization in emerging countries such as China, Japan, South Korea, Vietnam, Indonesia, Philippines, Thailand and India. Furthermore, the increasing demand for residential housing across these regions is driving the demand for concrete.