Intent 1:
To limit the probability of:
- an excessively high cement/aggregate ratio, which could
lead to poor workability, excessive compressive strength and attendant
high shrinkage, which could lead to tensile stresses and the cracking
of mortar or masonry units, or
- an excessively low cement/aggregate ratio, which could
lead to weak, porous mortar and inadequate bonding with masonry units.
Where masonry construction is required
to provide fire resistance, this is to limit the probability of excessive
deformation or cracking, which could lead to compromised fire resistance
of the assembly, which could lead to harm to persons.