Propamsa Solutions

How to repair reinforced concrete

Reinforced concrete plays a very important role in our daily life, since it is present in most building and public works structures.However, although it behaves well in service, its durability is compromised by various pathologies that can affect it. 

The most common and frequent is carbonation, chemical process because of which, the concrete loses the ability to protect the rebar against corrosion. The carbonation advances as a front in the concrete and when it reaches the rebar, in the presence of moisture, begins the corrosion.

The reinforcement, when oxidized, increases its volume producing internal tensions in the concrete that are translated in detachments or breaks, that in the long can weaken the structure.

The corrosion of the reinforcement can also be originated by the action of chlorides, sulfates, …; is what is known as  pitting corrosion (occurs at certain points of the armature, in a discontinuous manner).

Related products

Solution

The repair of a concrete consists of four basic operations:

Preparation of the substrate. Mechanically remove deteriorated concrete until reaching a substrate that, in addition to having a pH above 9.5, has a percentage of chlorides below the minimum required.

Protection of reinforcement. The rebar must be exposed on the entire surface where it is oxidized. Clean the oxide layer of the reinforcement with a brush or sand blast and then apply BETOPRIM EPOXI as a protective primer against corrosion.

Filling. Use the repair mortar PROPAM® REPAR 40 to perform the repair. The reinforcement must always be totally covered and all cavities must be completely filled, avoiding the formation of internal voids. Pre-apply the BETOPOX® 93 primer on the surface of the concrete to be repaired. Coat with PROPAM® REPAR 5 to obtain a smoother and thinner surface finish.

Protection of the final surface. The simplest way to protect concrete against carbonation, chlorides and environmental chemical aggressiveness is achieved by a continuous coating of a one coat mortar of the REVAT® range, or by an acrylic coating (BETOPAINT, REVAT® FILM, REVAT® PLAS) .

Recommendations

  • The concrete of the substrate must always be firm (minimum tensile strength of 1 N / mm2), free of cement slurries, oils, grease, debris, old paints, etc.
  • Concrete repair can also be carried out with the product PROPAM® REPAR TECHNO. In this case, it is not necessary to apply the passivation primer of the reinforcement or the concrete primer.
  • If BETOPOX® 93 is used as a bonding primer, PROPAM® REPAR 40 must be applied as long as the bonding primer is fresh, ie within 4 hours of application.
  • For cosmetic repairs of small thickness, use PROPAM® REPAR 5. BETOPOX® 93 is not required for this type of repairs.
  • The curing of PROPAM® REPAR 40, PROPAM® REPAR TECHNO or PROPAM® REPAR 5 is essential for at least 24 hours after application to ensure that the product achieves its intended properties.
  • Use PROPAM® FIX primer to apply single layer mortars of the REVAT® range on the concrete surface.

Solutions by category

Subscribe

Join thousands of professionals and don’t miss the latest in materials, construction techniques and training.

Social networks

Other solutions in Concrete repair and protection

other highlighted solutions

Technical mortars

Build a barbacue

Making barbecues, chimneys, ovens, etc., requires using specific materials that withstand the extreme conditions to which they are going to be exposed (high temperatures, expansions and contractions, etc.). The solution lies in using PROPAM® REFRACTARIO, a refractory mortar which, due to its technical characteristics, is suitable for coating walls and making joints that are subject to environments in contact with fire or high temperatures. The abrupt changes in temperature that occur when lighting barbecues, fireplaces, ovens, etc., produce dilations. When turning off facilities, contraction movements in the materials used are produced. These changes can produce cracks and even lead to loosening, if the materials used for its...

Seguir leyendo

Technical mortars

Build a wall with glass blocks

A glass block is a very useful material both in construction, decoration and interior decoration, as it can be used to separate different ambiances, showers, outside walls, or simply as decoration. It is formed by two pieces of molded glass, which are welded at a very high temperature, to create a vacuum air chamber between the two pieces. This air chamber confers the capacity of thermal-acoustic insulation. Once placed provides highly decorative finishes, given the wide range of formats and colors. Related products PROPAM® GLAS Solution SUBSTRATE PREPARATION Check the condition of the substrate, it must be completely set and clean of dust, paint, oils, etc ... It is essential that the substrate is perfectly levellled, only this way we...

Seguir leyendo

Technical mortars

Making quick fixings in masonry

Masonry tasks like arrissing, small anchorings, door and window framing, attaching pawls, sanitary units, hinges, etc., require the use of quick hardening mortars that can provide very high mechanical resistances in a few minutes.  The solution lies in using PROPAM® CEM RAPID, that is, a mortar formulated on the basis of high resistance cements and special quick setting and hardening admixtures. Related products PROPAM® REPAR 20RPROPAM® PRONTO Solution SUBSTRATE PREPARATION The substrate must be firm (minimum tensile strength of 1N / mm2), rough and free of oils, old paint residue, demoulding agents, dust, cement slurries, etc. Moisten the substrate with water before applying PROPAM® CEM RAPID. This operation must be...

Seguir leyendo

Waterproofing systems

Fixing glass wool in an enclosure chamber

The need to obtain efficient thermal insulation and even more so since the TBC came into force a few years ago, has lead the construction industry to develop materials like glass wool, for use as thermal insulant and acoustic absorbent in enclosure walls inresidential, commercial, industrial and service buildings. For its correct placement it is necessary to use a mortar that allows the waterproofing of the enclosure against water that can penetrate from the outside, without forming a vapor barrier. Related products PROPAM® MUROS Solution SUBSTRATE PREPARATION Check the condition of the substrate, it must be resistant and be completely set and clean of dust, paint, oils, etc ... Remove mortar remnants from joints between bricks. The...

Seguir leyendo

Do you already receive our newsletter?