Construction chemicals chemicals and ingredients

Admixtures are added in small amounts to concrete but change its behaviour dramatically. Polycarboxylate ether superplasticisers allow high strength and self-compacting concrete with low water content, accelerators speed up setting in cold weather and precast production, retarders keep concrete workable during long transport in hot climates, and air entraining agents protect concrete against freeze-thaw damage. Dry mortar producers rely on cellulose ethers, redispersible polymer powders and other additives for tile adhesives, renders and self-levelling floors.

Performance depends on local materials, so admixture suppliers run trial mixes with the customer's cement, aggregates and climate conditions before supply. Standards such as ASTM C494 in the Americas and EN 934-2 in Europe define admixture types and tests, and many countries have national equivalents. Sustainability is a growing driver, since admixtures that allow less cement or more supplementary materials such as fly ash and slag lower the carbon footprint of concrete. When you post a request, describe the application, the cement and mix design, the performance target and the current product and dosage, so suppliers can propose a solution and organise trials.