Margel 580 Testing and Results

Margel 580 is based on a patented combination of 3 corrosion inhibiting chemicals that provide protection to steel and other metals.

During the initial development and testing of the product, multiple tests were carried out both in the laboratory and on live sites, and the effects on corrosion were monitored until the perfect combination of chemicals was chosen. The tests were measured in several different ways, including half-cell measurements of the concrete structures and detailed analysis using a scanning electron-microscope of the embedded steel. Once the engineers were satisfied with the in-house results the products were tested by an independant laboratory.

In 1990, Bierrum Structural Services Ltd working with QED commissioned a test to show the effect of Margel DCI 580T on suppressing steel corrosion within concrete. Testing was carried out by Bierrum at their Peterborough site.

Ten concrete cubes were prepared in a mould measuring 400mm x 400mm x 400mm, single steel reinforcing bar measuring 500mm in length was set in the centre of each cube.  Chloride levels were calculated at 2% by volume of concrete.  5 of the cubes were drilled with a hole to a depth of 100mm in the middle of one side. A Margel cartridge 25mm long by 25mm diameter was sealed in the cavity drilled within the concrete. The cubes were left stored outside for a period of approximately 3 years.

In September 1993, the concrete cubes were broken to assess the affects of the Margel DCI 580T. In the cubes with the Margel cartridge installed, there were no signs of corrosion to the rebar. In the cubes without the protection of Margel, the corrosion of the steel rebar was significant as shown in the photographs above.

Makers Industrial Ltd and QED jointly commissioned an independent test to verify whether it is possible for a corrosion inhibitor to migrate through concrete.

Samples of Margel VPI 580 where submitted for testing to Geomaterials UK

The Conclusion Summarised by Dr French BSc, PhD, FGS of Geomaterials was;

"It is clear that Margel does travel through a concrete pore structure, or more precisely, each element of the product does"

"Each active ingredient contains a known corrosion inhibitor with an industry track record of inhibiting corrosion, we can verify that this readily travels through dense structural concrete"

Subsequent tests have proved that once Margel 580 is inserted into the core structure of a building suffering from corrosion effects, the resultant change from a "corroding state" to a "non-corroding state" can be measured using "half-cell" techniques.

Setpoint Margel Test Report 2014

Further Test Results wil be published in 2017

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