Introducing Crown Portland Composite Cement
Crown Portland composite cement is CEM-II/A-M is a cement consisting of Fly ash (PFA), slag and limestone designated by the specification of BDS EN 197-1: 2003; CEM -II/A-M (V-S-L), 42.5 N. PCC is the most suitable cement for construction in Bangladesh. CEM – II /A-M contains 80-94% Clinker, which is substantially higher than CEM – II/B-M containing 65 – 79% Clinker that will give us extra advantage in strength development and increase concrete performance.
Both slag & fly ash (PFA) are used in PCC. Percentage of SiO2 in PFA is higher than slag which is advantageous to gain more longterm strength and ensure durable concrete. The hydration process of normal cement produce CHS (durable binder) & Ca(OH)2 (non-durable binder).