ABSTRACT
Concrete plants do not have sufficient silos to hold a wide range of cements and it is unlikely that a producer will empty a silo and fill it with a different cement unless the order is very large or the price high. All UK concrete plants can supply concretes containing CEM I and most can supply a range of equivalent combinations to cements based on either ground-granulated blastfurnace slag (ggbs)[3] or pulverized-fuel ash (pfa) conforming to BS3892: Part 1[4]
2 Equivalent combinations
Most UK concrete producers have developed a system whereby they have a silo of a high strength Portland cement (CEM I) and a silo of either ggbs to BS6699 or pfa to BS3892:Part 1. This gives the producer the flexibility to supply either CEM I concretes or concretes containing equivalent combinations to the range of cements containing slag or fly ash.
