7.
Why is it necessary to add calcium chloride to a mortar mix?
A.
To prevent freeze/thaw hydration
B.
To speed up the curing process
C.
To slow down the curing process
D.
To prevent the evaporation of moisture from the mortar
8.
When is it necessary to retemper mortar?
A.
When the mortar has been mixed for one or more hours
B.
When the mortar stiffens
C.
When the mortar falls off the trowel
D.
When the mortar becomes contaminated.
9.
When is it necessary to use a mortar box?
A.
When mortar is mixed by hand
B.
When the mortar is too wet to mix
C.
When large amounts of mortar are being used
D.
When fewer than 100 concrete blocks are required
1-11
EN5157
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