How Can Concrete Be Repaired, When Steel Reinforcements Are Corroded?

Repair of damage with exposed steel reinforcement

Before undertaking any concrete repair, care should exist taken to fix props and supports around the location to be repaired, especially in the surround of damaged columns and beams.

The following surface preparation is recommended:

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Step 1

• By using a marker pen, delimit the area of damage.

• Break beyond the delimited area until reaching audio concrete and steel.

• With a jackhammer, saw-cut 2 cm deep in xc° angle the perimeter of breaking, in order to avoid feather edges.

• All weak, damaged and easily removable concrete should be chipped away. If the re-confined are only partially exposed later all unsound physical is removed, it may not be necessary to remove additional physical to expose the total circumference of the reinforcement. When the exposed reinforcement steel has a loose wrap, corrosion or is not well bonded to the surrounding concrete, the concrete removal should continue until a clear infinite of 15 to 25 mm is created behind the reinforcing steel.

Step 2

• Clean steel reinforcement with mechanical wire-brushing or by sandblasting.

• In case the reinforcing bars are corroded and have lost more than than 25% of their diameter, they have to be cut and removed.

Step iii

• In such upshot, removed steel bars should be replaced with new steel bars of the same bore either by respecting the overlap length or by welding 100 mm length to the existing steel.

Step 4

• Remove dust by air blowing and wash with make clean water to attain a Surface Saturated Dry (SSD) substrate.

Protection of steel reinforcement against corrosion:

After all necessary grooming, steel reinforcement should exist protected against corrosion with a highly alkaline product weberep 370 PF or a zinc rich production that delays the ambitious elements set on steel, like weberep 501 ZRP

Stride past step solution

Damaged surface with repair thickness upwardly to ten cm

weberep 331 TX is a thixotropic, not-shrink repair mortar, fiber reinforced and polymer modified.

The powder is mixed with the proper amount of clean water using an advisable electrical mixer until a homogeneous paste is obtained.

weberep 331 TX and weberep ST can exist practical for thickness upwards to 5 cm in one coat. A thickness of up to x cm tin be achieved in two layers.

For areas that are difficult to access, or if there is a need for a flowable repair mortar, utilize weberep 301, a highly fluid non-shrink mortar.

When mixed with the proper amount of clean h2o using an appropriate electric mixer, a lump-free homogeneous and pourable mix is obtained. This product is applied to a 5cm layer. For higher compressive strength it is recommended to utilise weberep 301 HCS to supplantweberep 301.

For higher compressive strength, information technology is recommended to employ Conrep.331 HCS instead of weberep 331 TX.

Proper curing should be performed.
Damaged surface with repair thickness in a higher place x cm

weberep 311 MC is a non-compress micro-physical for structural repair and full general void filling. When mixed with the proper amount of water using an advisable electrical mixer, a lump-gratuitous homogeneous mix is obtained.

For higher compressive strength it is recommended to utilise weberep 311 MC- HCS.

weberep 311 MC and weberep 311 MC-HCS can be practical in thickness ranging from fifty mm to 300 mm per layer although greater thickness upward to 500 mm tin exist good depending on the pattern of the repair job and level of steel reinforcement.
Curing and protection

Afterward completion of repair, or between ii layers, and when the repair mortar has reached its final setting (which depends on the ambient temperature), the repaired surface area should be cured either by using the traditional method or by applying a curing compound weberad cure WT or weberad cure Y40. The repaired expanse should be protected with Polyethylene sheet against drying due to current of air or fast evaporation.

Necessary products for this solution