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info@zsconcrete.co.nz
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Environment Control

  • March 1, 2025
What is concrete slurry waste?
Concrete slurry waste is the bi-product generated when performing concrete cutting. It is the combination of the concrete that is separated during the concrete sawing and drilling process which combines with the water used during the concrete cutting process. This wet cutting technique results in the generation of a grey liquid substance which is referred to as concrete slurry waste.

Why concrete slurry runoff is toxic for the environment?

The disposal of concrete waste or slurry into our stormwater systems creates a highly toxic environment that can damage our fragile aquatic ecosystems.

The biggest component of cement is lime, which can be found in all concrete products.
When lime in cement dissolves in water it produces an alkaline solution that can kill insects, fish, and plants.

Concrete waste and slurry also contain toxic metals that have a high pH level of around 12.

The safe pH level for an aquatic life habitat is between 6.5 and 9.

Controls
  • Vacuum Systems: Wet vacuums are used to suck up slurry at the source and transfer it to a holding tank for disposal.
  • Containment: Baffles, booms, or sandbags can be used to trap slurry and prevent it from flowing into drains or waterways.
  • Disposal: Slurry is then transported to a designated disposal site or recycled.
  • Sucker Truck: if its a large area for new driveway wash off , a sucker truck is the efficient and economical way of managing slurry collection and disposal.
We at ZS Concrete Cutters discuss the slurry controls with our customers and find the best way to manage slurry on every site.

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