Concrete Pumping

Mix Pumpability

• Verify pumpability with the producer (paste volume, gradation, fines). Trial on long/vertical runs.
• For lightweight mixes, pre-wet aggregates per mix design to reduce slump loss.
• Use admixtures (WR/VMA) instead of “job water” to fine-tune flow.

Line Setup & Priming

• Choose appropriate diameter; minimize reducers and tight bends. Secure clamps, gaskets, pins.
• Prime with approved slurries or devices—avoid water-only priming unless specified.
• Anchor lines; protect walkways/traffic; plan blow-outs in safe, contained zones.

Operations & Safety

• Maintain a steady rate; limit starts/stops to avoid slugging/air voids.
• Establish an exclusion zone around hopper/boom/line; never open a pressurized line.
• Coordinate discharge points with finishing; use hand signals or radios.

References

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