Why is it necessary to add calcium chloride to a mortar mix?
To prevent freeze/thaw hydration
To speed up the curing process
To slow down the curing process
When is it necessary to retemper mortar?
When the mortar has been mixed for one or more hours
When the mortar stiffens
When the mortar falls off the trowel
When the mortar becomes contaminated.
When is it necessary to use a mortar box?
When mortar is mixed by hand
When the mortar is too wet to mix
When large amounts of mortar are being used
When fewer than 100 concrete blocks are required