Abstract
There are several methods of ensuring high performance and durability of concrete by the use of modem admixtures. Special superplasticising admixtures can be used to produce flowable mortars and concretes of low water-cement content and organic polymers may be incorporated with ordinary Portland cement to produce concrete mixes with improved fresh and hardened properties for special applications. Alternatively, durable concrete may be obtained by adding reactive cement replacement materials. As a consequence there is a need to provide comparative performance data for such materials to enable engineers make an informed decision in selecting materials most suited to specific situations.