As cement/sand ratios, and especially water/cement ratios have a considerable
influence on the properties of the mortar, a range of cement/sand ratios was tested
and mixtures with commercial additives designed to reduce the water content without
losing workability, were added Gomplete results of tests are available in the report
referred to above, and it is sufficient here to indicate the the most suitable mixture
when judged both for economic advantage and sufficient strength, proved to be a mixture
with the following components