Figure 1-2. Mortar box
If the mortar has become stiff
on the mortarboard because
of the evaporation
water, you must add water and retemper the mortar to restore its plasticity. Remember the following:
Mortar should be used within 2 1/2 hours after original mixing when the temperature is 80 degrees
Fahrenheit or higher.
Mortar should be used within 3 1/2 hours when the temperature is below 80 degrees Fahrenheit.
1-19. Discarding. It is sometimes difficult to determine if the mortar should be remixed and used. If in
doubt, discard the mortar. Ensure you comply with all environmental laws and regulations when
discarding waste. Never use mortar after it has been dropped on the ground or contaminated in any way.