Filling concrete masonry unit (CMU) walls is a critical step in reinforcing structural integrity, increasing load-bearing capacity, and meeting modern building codes.
If you are filling vertical cores for a commercial warehouse or stabilizing a residential retaining wall, the goal is a void-free, consistent fill.
Black Jack Grout Pumps provides the flow and pressure control necessary to pump grout into narrow masonry cores without the mess or segregation common with bucket-pouring.
Our USA-made systems are designed to keep your masonry crew moving, not waiting.
Our grout pumps are the preferred choice for contractors managing:
We’ll help you find the right product for your job, whether you know what you need or have a few questions first.
For CMU filling, you need a pump that can handle fine grout (grout with small aggregates) without clogging or separating.
Smooth Vertical Flow: Maintains a consistent head-pressure to push grout up several stories without pulsing, which can disturb your rebar placement.
Anti-Segregation Design: Keeps the sand, cement, and water in suspension, ensuring the grout at the top of the wall is just as strong as the grout at the bottom.
Precise Placement: Variable speed controls allow your nozzle operator to fill cores cleanly without splashing grout onto the face of the block.
Vertical Delivery Hoses: Lightweight, high-pressure hoses that are easy for a worker to maneuver on a scaffold.
Grout Nozzles for CMU Cores: Specifically shaped to fit into standard 8″ and 12″ block cells for mess-free injection.
Continuous Paddle Mixers: Ensure a constant supply of fresh grout, which is vital for preventing cold joints in high-lift masonry pours.
A block wall is only as strong as the bond between the grout and the block shell. Our proprietary cementitious grout is optimized for CMU work:
1. Superior Flowability: Designed to navigate around tight rebar cages and horizontal ladders without leaving air pockets.
This high-slump performance ensures every corner of the cell is filled, providing 100% encapsulation of your steel reinforcement.
2. Increased Bond Strength: Formulated to grab the interior of the CMU shell, creating a unified structural unit.
Better bonding leads to a more resilient wall that can better handle seismic loads and high-wind pressures.
3. Low Shrinkage: Minimizes the pull-away effect as the grout cures.
By maintaining its volume during the hydration process, our grout ensures a tight fit within the block, preventing moisture migration and internal corrosion.
1. The High-Lift Method: If you are filling more than 5 feet of wall at a time, use a clean-out at the bottom to ensure the grout has reached the base.
2. Consolidation is Key: Even with high-flow grout, a quick mechanical vibration helps settle the material around the horizontal steel for a perfect bond.
3. Watch the Weather: In hot weather, dampen the CMU cores slightly before pouring to prevent the block from sucking the moisture out of your grout too quickly.
We’ll help you find the right product for your job, whether you know what you need or have a few questions first.
