G.K. BOWLER*, P.J. JACKSON** and M.G. MONK*** * Hanson Brick, ** Sampling and Scientific Services, *** Blue Circle Cement
Workability is assessed by two Cohesivity Indices which use the results of standard tests. CI(A) is the flow table spread of standard consistence mortar with a fixed number of jolts divided by the spread of a standard, calibrated sand/water mixture. CI(B) is the number of jolts for a given flow table spread of standard consistence mortar divided by the number of jolts for a given flow table spread of a standard calibration sand/water mixture. Masonry cement mortars are more cohesive than OPC mortars and with fine mineral filter and higher air contents they are even more cohesive. The results accord with an experienced mason’s opinions.