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Pumped Concrete

Concrete transported through pipes using a concrete pump for hard-to-reach placements

Pumped concrete is transported through pipes using a concrete pump from truck to placement location. Pumps enable placements in areas inaccessible to trucks: upper floors, long distances, over obstacles. Most commercial construction uses pumped concrete for efficiency and access.

Why It Matters

Pumping solves logistics problems: placing concrete on upper floors without cranes hoisting buckets, reaching 500+ feet horizontally, placing continuously without interruption. Labor savings and speed often offset pump rental costs. For difficult access, pumping may be the only practical option.

Pumped concrete requires specific mix characteristics: adequate slump, proper aggregate gradation, smooth flow without segregation. Not all mixes pump well. Communication with ready-mix supplier about pumping requirements ensures appropriate mix design.

Technical Details

Pump types:

  • Boom pumps: Articulating arm, 100-200 ft vertical reach, truck-mounted, $800-1500 per day
  • Line pumps: Flexible hose, lower pressure, smaller volumes, $300-600 per day

Mix requirements for pumpability:

  • Adequate slump (typically 4-6 inches minimum)
  • Proper sand content (40-50% of total aggregate)
  • Rounded aggregate better than crushed
  • Water reducers improve pumpability
  • Maximum aggregate size limits (typically 3/4 inch for small pumps)

Pumping distances:

  • Boom pumps: 100-200 feet vertical, 1000+ feet horizontal
  • Line pumps: 300-500 feet effectively
  • Pressure and mix determine practical limits

Benefits:

  • Access difficult locations
  • Continuous placement
  • Reduced labor
  • Faster placement
  • Less site congestion

Considerations:

  • Pump rental cost
  • Mix design requirements
  • Line cleaning (waste)
  • Pressure on formwork
  • Setup time
  • Placement - Pumping is a placement method
  • Slump - Adequate slump required for pumping
  • Ready-Mix - Usually pumped from ready-mix trucks

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