AkzoNobel’s cementitious coating passes 30-year test

FCT122 4Formerly known as Flexcrete Cementitious Coating 851, Intercrete 4841 has been used in independent tests for more than 30 years to confirm that it provides an effective barrier against chlorides

The tests were carried out at the VINCI Construction Technology Centre in Bedfordshire, UK.

In 1988, a two mm thick film of Intercrete 4841 was applied to a concrete slice and sealed in a chloride ion diffusion cell, and 30 years (10,950 days) later it still provides full protection.

Continuous tests showed that the barrier properties of Intercrete 4841 remained the same throughout the test period, a testament to the consistent and long-lasting performance of the product.

Chris Lloyd, a co-founder of Flexcrete Technologies Ltd, acquired by AkzoNobel in 2017, said, “The performance demonstrated in this test by Intercrete 4841 is unparalleled.”

“In VINCI’s experience, many coating systems degrade overtime when on test in the cell, and even products that initially perform well can subsequently blister, resulting in more chloride ions passing through the product. Intercrete 4841 has not shown any signs of deterioration despite being fully immersed in the chloride solution for 30 years. It would have taken 271 years for the product cell with the Intercrete 4841 to reach the same chloride concentration that the uncoated specimen reached in just 98 days,” he added.

Intercrete 4841 is a two-component water-borne cementite polymer coating, originally introduced in 1985. It remains a market-leading solution for chlorides and other forms of damage and corrosion by forming a hard, alkaline coating with high resistance to pressure.

As a result of this advanced protection and proven performance, Intercrete 4841 is widely specified on existing and new structures for waterproof concrete, restoring concrete cover and providing an effective barrier against challenging conditions such as coastal environments, highways and the water and wastewater industry.

It can also provide an alternative to the recasting or demolition of precast and in-situ reinforced concrete, thus enhancing the durability of the substrate to achieve its specified design life.

Alain Charles Publishing, University House, 11-13 Lower Grosvenor Place, London, SW1W 0EX, UK
T: +44 20 7834 7676, F: +44 20 7973 0076, W: www.alaincharles.com

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