Cements are powders made of ground ordinary Portland clinker, gypsum and other mineral components (limestone, pozzolan, slag, fly ash…) Cements have hydraulic properties: they set and harden in the presence of water. Grey cement comprises:
- Ordinary Portland Cement or OPC (grey cement with only minor addition of mineral component, <5%, composed by >90% clinker, gypsum and a small proportion of minor additive). Typically operated for applications requiring fast strength gain such as for precast, high-rise buildings, high performance concretes
- Blended Cement: Cement type composed by Clinker, Gypsum and a proportion of additive such as limestone, fly ash, pozzolan or slag. Blended cements are used for wide range of applications. Common benefits of using blended cements compared to OPC include costs, CO2 reduction and specific performance.
- Other cement required for specific applications:
- Sulfate-resistant cement (EN: SR; ASTM: Type V): Durable cement-type highly resistant to salt attacks. Typically used in environment exposed to salts such as underground or seawater.
- Low-Heat cement (EN: LH, ASTM: Type IV): Low Heat cement generates low heat of hydration during setting. Typically used for large civil work where important heat gradient between center and surface of concrete could generate cracks. Some LH cement have a limited C3A content.
ABT manages a large network of producers and can supply a large range of cements.