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Technical Information

Mechanical Splicing

Moment BarBreak Coupler

BarBreak Connection Splice

Seismic Design

Post Tensioning

Control Permeability Formwork (CPF)

Frequent Asked Questions

What can be expected of CEM-liner formwork cast concrete surface?

CEM-liner (CPF) works by balancing the critical w/c ratio in the outer surface of the concrete and release of entrapped air, resulting in uniformly matt finished concrete surface of high quality and homogenous coloration,dense concrete surfaces with near zero blowholes and blemishes, high strength concrete surface with low maintenance

When do I remove formwork?

There is no change of process, however CEM-liner formwork maybe left for later dismantling for improved curing where situation warrants.

What type of concrete mix permissible?

CEM-liner formwork maybe used for all types of concrete mix design irregardless.

Is there a difference between Test Cubes and Field / In-situ Core when used as Test Specimens for durability?

Absolutely. Test Cubes are deem fully cured specimens by ponding whereas Field / In-situ cores using curing agents has a poor curing regime of not more than 80% versus ponding. A significant contrast can be expected during the test program.

Why lower the W/C ratio?

The W/C ratio in the concrete plays a crucial role in determining the all round properties of the concrete and long term durability of    the structure. It is a fact that with lower w/c ratio a stronger concrete is obtained. Excess free water not taken up in the  hydration of the cement content and lubrication of the mix tend to bleed to the surface forming a network of capillaries and  pores interlocking with the voids, cracks and micro cracks of hardened concrete thus permitting re entry of any deleterious salts,  chemical and gases detrimental to the structures over time. The rise in w/c ratio is further exacerbated by the process of placing  and compaction.

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How can you prove such effects?

Clear water drained though the formwork can only mean the surface w/c ratio of the concrete has been lowered though the CEM-liner. A simple Schmidt Rebound Hammer reading would justify the increase of surface strength.

Can CEM-liner be used for vertical, inclined or horizontal structures?

The principle action of the hydrostatic pressure forces water through CEM-liner in any direction whether vertical, horizontal, or slope.

How many times can CEM-liner be used?

CEM-liner is available in single use or multiple use versions

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