GeneralQ We are shooting 5000 psi (34.5 MPa) shotcrete. Because of rising temperatures, the mixture is getting too stiff to pump, and the inspector will not let us add water. What should be done in this situation??
At the point at which concrete/shotcrete temperature is starting to rise and the mixture is stiffening up, adding water should not be allowed. Water should only be added when the mixture is stable and only up to the water specified in the approved mixture design. In warm or hot conditions, retarders, set stabilizing admixtures, or ice may be needed to keep the mixture stable for the period of time to transport and pump the load.
