Zero-cement, alkali-activated cementitious material (AACM) binder, of which 95% is ground granulated furnace slag (GGBS) and 5% is the activator. Designed to activate pozzolanic materials to create a cement free binder which can replace a variety of cement types and produce an ultra-low carbon alternative to concrete mix designs that traditionally use Portland cement.

Similar in structure to autoclaved aerated concrete (AAC) materials, where a cement gains its strength and other properties via a chemical reaction between a source of alkali (soluble base activator) and aluminate-rich materials.

Features and benefits:

  • Reduced CO2 emissions – a carbon reduction of up to 90% is achievable.
  • Reduced heat evolution.
  • Has all of the structural characteristics of traditional concrete.
  • Sustainable.
  • No need to invest in new equipment or working practices.
  • Reduced chloride diffusion coefficient.
  • Enhanced chemical resistance to sulphate and acid, with improved resistance to chloride ingress.
  • Enhanced fire resistance.
  • Reduced shrinkage ensures a reduction the number of joints overall in a structure is possible.
  • Provides a potential reduction in the crack-control steel required for a project.
  • Safe and easy to handle.
  • Lighter in appearance to conventional concrete.
  • Manufactured in accordance with PAS 8820: 2016.


  • Capping beams.
  • Retaining walls.
  • Piling.
  • Strip foundations.
  • Reinforced foundations.
  • Raft slabs.
  • Walls.
  • Mass concrete fill.
  • Over-site applications.
  • Floors.
  • Pre-cast elements.

Should not be exposed to rain water or moisture.

Consult manufacturer for specific mixing and dosage instructions.

Standard product features



Technical characteristics:

  • Composition: 95:5 (GGBS: activator).
  • Fire resistance (BRE): Pass.
  • Alkali silica reaction (BRE): Pass.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-55-18/320 Cement and cement replacement materials

Product specification

An important note about specifying



PUDLO Waterproof Systems & Cemfree Zero-Cement Concrete, part of the DB Group Ltd


+44 (0)1954 780687

Product reference

[Cemfree Activator (CFA)]
Provided in 5 kg soluble bags and is added to the GGBS mix at the specified (5% by binder) weight.
[Cemfree Binder (CFB)]
Provided in 1 T bags or bulk binder form where the GGBS and activator is premixed.

Manufacturer details

Wellington Way,
Bourn Airfield,
Cambridgeshire, CB23 2TQ
Tel +44 (0)1954 780687
NBS Plus