Self consolidating concrete formwork pressure

• Host a pre-pour meeting to outline the pumping procedure and responsibilities of all crew members involved in the pour.*Note: KING’s technical staff is available for pre-pour meetings or on-site consultations, in order to help contractors achieve a successful concrete repair.• Valves should be spaced at a maximum distance of 600 mm (2 ft) in both the horizontal and vertical directions of the formwork.

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In addition, the correlation between the formwork pressure response and the loss of slump flow is derived, providing an approximate method to estimate the reduction in formwork pressure.

TY - JOURT1 - Effect of mineral admixtures on formwork pressure of self-consolidating concrete AU - Kim, Jae Hong AU - Beacraft, Mark AU - Shah, Surendra P.

If necessary 13 mm (½ inch) plastic tubing can be placed at extremely high points, to ensure that the air is pushed out of the form.

• Minimum hose and valve sizes should be 38 mm (1½ inches) for MSS6 SCC Concrete and 50 mm (2 inches) for MS-S10 SCC.

• Ensure that constant communication between the pump operator and the individual responsible for valve and hose placement can be maintained.

• Fill the formwork with water prior to pumping, in order to check for water tightness and to saturate the parent concrete and formwork.

• The entire section of self-consolidating concrete should be pumped in one pour, without stopping.

This procedure will help the concrete already in the formwork from losing slump flow before the formwork is completely filled.

• Different types of valves can be used to connect hoses to the formwork, although the most common type is the guillotine valve which can be seen in Figure 1.

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