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Technical Information

Mechanical Splicing

Moment BarBreak Coupler

BarBreak Connection Splice

Seismic Design

Post Tensioning

Control Permeability Formwork (CPF)

Controlled Permeability Formwork (CPF)

Benefits

The concrete casing of up to 25mm depth being the “fore-most” line of defense has the distinction of best quality concrete, irrespective of the mix design or type of cement used. The overall increase in cement content in this outer zone promotes optimum concrete properties such as all round strengths and impermeability, hence the long term durability even in marine and aggressive environments.

How it works

CEM-liner is a non-woven fabric synthetic liner installed in the formwork face to function as a filter media to retain cement particles and allowing the release of entrapped air without the dangerous build up of w/c ratio in the concrete surface zone. All normal concrete practices are maintained but no release agents shall be used.

In the process of concrete placing and compaction, the hydrostatic head forces any excess water and air through the controlled pore structure whilst cement fines are prevented from escaping. The liner fabric provides a drainage passage for clear water and air to be stored and drained.

The water retention capacity in the liner fabric (0.35L/m2) contributes significantly to the curing regime of the cast concrete surface – Fig. 1