If Pump Runtong is directly discharged into the concrete, it will reduce the concrete strength by one MPa at that time, but it will not have any impact on the strength of the concrete for more than 28 days; if Pump Runtong is drained, it will have no impact on the strength of the concrete. ; If the pump mortar is added directly to the concrete, it will reduce the strength of the concrete by 1% at that time, and the strength will still be reduced after 28 days. </p
