Mortar should be used with mixing, cement mortar and cement mixed mortar should be used in 3h and 4h respectively, when the maximum temperature during construction exceeds 30 degrees C, should be mixed into 2h and 3h, respectively. For mortars with slow coagulants added, the use time may be extended according to the specific use of the construction site, and the use of workers' mortars shall be supervised by a special person.
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