Westlux Creme Crete : Concrete Protection - Hydrophobic Impregnation
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Concrete Protection - Hydrophobic Impregnation
Westlux Creme C & Westlux 1701Introduction to Concrete Protection
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> mostly post treatment > engineering concrete > rebar and concrete protection |
- Application : Bridges, Tunnels, Quay Walls, Dams, etc.
- Main Benefits :
- Increase Durability (protection from harmful
pollutant). - Reduction of maintenance cost (repair is much
more expensive than protection by hydrophobic
impregnation).
- Increase Durability (protection from harmful
- Main Products :
- WESTLUX 1701
- WESTLUX Creme C
CONCRETE PROTECTION IS TO PROTECT FROM WATER
All damages to concrete require water
Hydrophobic impregnation thus prevent damages such as:
- chloride induced corrosion of rebar
- freeze-thaw damages, de-icing salts
- gasous pollutants
- carbonation
- alcali silica reaction
- ettringite formation
CONCRETE DAMAGES - TYPES OF CORROSION OF REINFORCING STEEL
Corrosion by chlorides
Corrosion by carbonation
DESPITE CONCRETE'S DURABILITY,SERIOUS DAMAGES WHICH ENDANGER BUILDING FREQUENTLY OCCUR:
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rebar passivates in an alkaline medium |
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dissolved salts penetrate deep into the concrete |
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chloride ions reach the steel and dissolve the protected layer |
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corrosion results in a volume expansion & a pressure buld-up |
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crack formation and spalling of concrete are the results |
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the inside damages become visible on the outside |
CARBONATION EXPLAINED
Carbonation reaction:
Ca(OH)2 + CO2 -> CaCO3 + H2O
rate of carbonation depends on:
- humidty (maximum rate at 50 - 70%)
- w/c value/porosity (more pores = larger surface = higher rate)
- compressive strength
- age of concrete (rate slows down with time)
depending on these factors, carbonation can stop at certain depths
Carbonation occurs from the outside to the inside of concrete
WRONG DESIGN OR EXECUTION IS OFTEN RESPONSIBLE FOR DAMAGES
Surface is strongly weathered, facilitated by insufficient compction pollutants can penetrate easily
Bad flow design facilitates corrosion
On Concrete with Moisture > 4% a silane (Westlux 1701) does not penetrate quickly enough and runs off (slabs @ 2.5 °; 250g/m2)
Concrete moisture level of 3,8% (left) and 5% (right)
Characteristics of Westlux Creme C
Westlux Creme C:
- Rapid & Outstanding Penetration
- High & Verifiable Coverage Rates
- Loss-Free One-Step Application
- Low Evaporation
- Water Based; Solvent Free
Concrete Treated with Creme C:
- Excellent Water Repellency
- Water Vapor Permeability
- Optimum Resistance to Alkalis
- Treated Concrete can be Coated
Comparison of Westlux Creme C to Conventional Liquid Impregnating Agents
The material can be applied without loss from dripping or trickling
Long contatc with the surface leads to deep penetration
A single application is generally sufficient (airless spraying at 70 - 100 bar, brushing or use lambskin roller)
Up to 400 mg/m2 can be applied even to vertical surfaces and ceilings - without material loss (200 mg/m2 is usually sufficient for high-quality concrete)
After application it must be covered form rain for at least 24 hrs
The surface can be coated after treatment
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Westlux Creme C saves time and reduce costs |
Application of Westlux Creme C
Airless spray
Lambskin roller
Freshly applied
After 30 min
After 2 h
Wuhan Yangluo Yangtze river bridge
Aplication procedure
 Polishing concrete
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 Drying and cleaning concrete
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 Applying Westlux Crem C by roller
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 Applying from bottom to top
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 Drill core sample
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 Impreg. quality control
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Fujian LNG pier, China (2006) - Creme C
- Location: Putian City, Fujian Province
- To protect concrete structure against sea water
- Aplication area: tidal zone part of precast concrete basement
Tsingma Bridge, Hongkong (1999) - Creme C
Tsingma Bridge, Hongkong
2160m long, main tower height is 206m
Okumiomote Dam, Asai, Japan (1999) - Creme C
Asai Okumiomote Dam, Japan
Project completed in 2002