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Rebar rescue

CONCRETE

Working with the Corrosion Group of Aston University, Fosroc has developed a method of applying the principles of galvanic protection to rebar. The result is Renderoc Galvashield XP, a new method of treating concrete structures suffering from chloride attack.

Galvanic protection of steel using sacrificial anodes is a proven and effective process used on ship hulls. Trials on concrete have previously resulted in the concrete substrate itself causing either passivation or erratic activation of the anode.

Fosroc says that even concrete suffering significant concentrations of active chlorides can be treated with Renderoc Galvashield XP. Preparation of the concrete is by traditional methods with the Galvashield anode attached directly to the rebar using wire ties.

The anode itself is encased in a specially formulated sleeve which facilitates electro-chemical migration of chloride ions- corroding the more reactive zinc anode while leaving the steel rebar intact. This means that rather than curing the symptoms of attack, corrosion is actually prevented, Fosroc claims.

Fosroc (01827) 262222

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