Question

If, while inspecting a new masonry wall, you notice an inordinate amount of shrinkage cracking in the mortar, you would probably suspect the mason’s mortar mix used: a) too high a proportion of portland cement; b) too high a proportion of hydrated lime; c) not enough air entrainment additives?

Answer

a) A high proportion of portland cement achieves high strength at the expense of overall water penetration due to shrinkage cracking.