Exposed slopes, highway cuttings, embankments, hill-road shoulders, and steep terrain around infrastructure sites are constantly under attack from rainfall impact, surface runoff, and gravity itself. Left untreated, surface erosion strips topsoil, undermines structures above and below, and can escalate into slope failure. nKrete GCCM gives engineers a fast, flexible way to armour a slope without the access and formwork challenges of cast concrete.

Why nKrete Suits Difficult Slope Geometry

  1. Flexible and conformable — nKrete drapes to the exact shape of the terrain, including irregular, steep, or broken slope faces where rigid concrete panels or shotcrete are impractical
  2. No heavy machinery required for most slope work — rolls can be positioned and pegged by hand on terrain that would be difficult to access with mixing/pumping equipment
  3. Strong under impact — fibre reinforcement absorbs energy from rainfall and debris impact, preventing the crack propagation that causes conventional erosion-control surfaces to fail
  4. Long-term durability — once hydrated, nKrete forms a resilient, weather- and UV-resistant surface designed for years of exposed outdoor service
  5. Fast coverage of large slope areas, reducing the window during which a freshly cut or exposed slope is vulnerable before protection is in place

Choosing Between GCCM and Cellular Confinement (GeoCell) for Slopes

Not every slope needs a full concrete-hard surface. Where the goal is soil confinement with vegetation growth rather than a fully armoured surface, for example, on slopes where a “green” finish is preferred or required our ennkae Cell (GeoCell) three-dimensional cellular confinement system may be the better fit, as cells can be filled with topsoil and seeded. For slopes with higher-velocity water flow, exposed rock/soil conditions, or where a hard, permanent wearing surface is specifically required, nKrete GCCM is the stronger choice. Many larger embankment projects use both GeoCell on the upper, vegetated slope sections and GCCM on lower sections exposed to concentrated flow.

For slope toe protection or where the slope meets a waterway or drain, see our Concrete Revetments (nKrete R) page for pre-engineered grouted mattress systems, and our Geo Drain Tube page for managing subsurface water that contributes to slope instability.

Installation Overview

  1. Slope surface preparation grading, removal of loose debris, vegetation clearing as required
  2. Roll-out of nKrete down the slope face with appropriate overlap between sections
  3. Anchoring/pegging at intervals suited to slope angle and expected water flow
  4. Hydration by spraying
  5. Curing to a hard, durable protective layer within 24 hours

FAQs

Q: Is GCCM better than geotextile erosion control blankets for slopes?

A: Standard erosion control blankets are typically temporary measures that support vegetation establishment. nKrete GCCM is a permanent, hard-wearing solution suited to slopes with higher flow velocities, steeper angles, or where a permanent hard surface is required rather than a temporary/vegetative solution.

Q: Can nKrete be used on very steep or vertical slope faces?

A: nKrete is flexible and conformable to a wide range of slope angles; for very steep or vertical faces, additional anchoring detail is typically required contact ennkae’s technical team for a site-specific installation recommendation.

Q: Does GCCM stop all slope erosion, or just surface erosion?

A: GCCM protects against surface erosion from rainfall impact and runoff. Where slope instability is being driven by subsurface water (seepage within the slope itself), it should be paired with a subsurface drainage solution such as our Geo Drain Tube system.