Product Data Sheet Show all documents

Sikagard®-8500 CI

(former MProtect 8500CI)

Dual-phase, surface-applied corrosion inhibitor

Sikagard®-8500 CI is a one component, ready to use, low viscosity, clear liquid that combines the power of a 100% active penetrating corrosion inhibitor and a latent-phase corrosion inhibitor to mitigate electrochemical corrosion of reinforcing steel in new or aged concrete. Sikagard®-8500 CI uniquely combines the primary reactive penetrant with a second, latent-phase corrosion inhibitor. This latent-phase inhibitor activates when the concrete cracks, migrating to the reinforcing steel to provide an extra level of protection when it is most needed.

  • 100% active ingredients. No diluents or fillers.
  • Easy to apply and quick-drying for fast installation.
  • Provides water repellent surface to prevent penetration of moisture and chlorides.
  • Reduces corrosion due to the ring anode or “halo” effect.
  • Suitable for use in new construction and repair applications.
  • Effective in chloride-contaminated and carbonated concrete to significantly slow down the rate of corrosion.
  • Latent-phase corrosion inhibitor activates if concrete cracks or if moisture penetrates the concrete, providing extended protection when it is most needed.
  • Vapor-permeable, to prevent moisture entrapment.
  • Effective in high humidity environments to mitigate corrosion of reinforcing steel.
  • Easy to apply surface treatment that penetrates into the concrete to bond with steel and the concrete matrix to inhibit macrocell (mat-to-mat) and microcell (along rebar) corrosion of steel reinforced concrete
  • Can be covered with most types of subsequent coatings, thereby reducing downstream labour costs compared with many other corrosion inhibitors.
Product Data Sheet Show all documents

Usage

Sikagard®-8500 CI is sprayed directly onto the surface of steel reinforced concrete structures and buildings. It is equally suited to cast in situ, precast, post tensioned, pre-stressed, GFRC or other steel reinforced concrete. Sikagard®-8500 CI can be used as part of an overall repair strategy using Sika concrete repair systems to mitigate corrosion rates within the balance of the structure and significantly reduce the possibility of “ring anode” induced spalling later.  Equally Sikagard®-8500 CI can be used as a cost-effective preventative measure before the onset of corrosion induced problems occur.  It is particularly suited for the protection of:
  • Steel reinforced concrete, including cast-in place, precast, pre-stressed and post tensioned
  • Building facades and balconies, parking structures, pedestrian walks, bridge decks and supporting elements (beams, columns, etc.), concrete docks and piers
  • Marine and other high humidity environments not subject to hydrostatic pressure
  • Steel-reinforced concrete exposed to de-icing salts

Advantages

  • 100% active ingredients. No diluents or fillers.
  • Easy to apply and quick-drying for fast installation.
  • Provides water repellent surface to prevent penetration of moisture and chlorides.
  • Reduces corrosion due to the ring anode or “halo” effect.
  • Suitable for use in new construction and repair applications.
  • Effective in chloride-contaminated and carbonated concrete to significantly slow down the rate of corrosion.
  • Latent-phase corrosion inhibitor activates if concrete cracks or if moisture penetrates the concrete, providing extended protection when it is most needed.
  • Vapor-permeable, to prevent moisture entrapment.
  • Effective in high humidity environments to mitigate corrosion of reinforcing steel.
  • Easy to apply surface treatment that penetrates into the concrete to bond with steel and the concrete matrix to inhibit macrocell (mat-to-mat) and microcell (along rebar) corrosion of steel reinforced concrete
  • Can be covered with most types of subsequent coatings, thereby reducing downstream labour costs compared with many other corrosion inhibitors.

Packaging

Sikagard®-8500 CI is available in 20 l plastic jerry cans and 1000 l IBCs.

Colour

clear to light amber liquid

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Sikagard®-8500 CI’s superior performance has been proved by several independent test reports.

 

Test Method

Description

ICCET Testing

Evaluation of performance of the surface applied corrosion inhibitors under chloride attack and carbonation.

ASTM G109

Determines corrosion effects of steel reinforcement in concrete when exposed to chloride environments.

FHWA-HRT-07-043

Corrosion tests on cracked concrete beams exposed to chlorides.

M-82 Testing

Evaluates the performance of corrosion mitigation technologies in concrete repairs.

 

ASTM C 876

Measures corrosion potentials of uncoated reinforcing steel in concrete.

EIS Testing

Electrical Impedance Spectroscopy for measuring corrosion rates on reinforced concrete elements.

University of Bergamo studies

Evaluation of reducing the penetration of chlorides in plain and cracked concretes as well as increasing the resistance against carbonation.
Product Information

Shelf Life

18 months after date of production if stored in undamaged, unopened containers at below mentioned storage conditions.

Storage Conditions

Sikagard®-8500 CI should be stored dry and cool, no permanent storage over +30 °C.

Keep containers closed when not in use and away from naked flames, heat sources and sparks.

Density

0.88 kg/l

Flash Point

+62 °C

(EN ISO 2719)

Viscosity

At +23 °C0.82 cP
Technical Information

Penetration Depth

15 mm(EN 1504-2 Table 3,No. 19)

Water Absorption

compared to untreated sample

2.8 %

in alkaline solution compared to untreated sample

9.9 %

Water Absorption Reduction

> 88 %

Drying rate coefficient

55 %

(EN 13579)

Permeability to Water Vapour

Moisture Vapor Transmission Performance

> 75 %

Waterproofing Performance After Abrasion

> 85 %

 

Chloride Ion Diffusion Resistance

Chloride Reduction

> 88 %

Chloride Reduction

> 90 %

Resistance to Weathering

no yellowing or discolouration(NCHRP Report 244, Series IV [Southern Exposure])

Freeze Thaw De-Icing Salt Resistance

Loss of mass after freeze-thaw salt stress

≥ 30 cycles later than not impregnated specimen

Application

Application Information

Ambient Air Temperature

+5 °C to +38 °C

Substrate Temperature

+5 °C to +38 °C

Curing Time

Sikagard®-8500 CI finishes its chemical reactions in two weeks.

Waiting Time / Overcoating

Wait at least for 24 hours after the last Sikagard®-8500 CI application before applying eventual subsequent coatings.
Consumption

Consumption

0.6 liter/m² respectively 0.5 kg/m²
Application steps

SUBSTRATE PREPARATION

New concrete must be properly cured. Concrete should obtained 80% of design strength, which typically takes 14 to 28 days, depending on mix design.

Concrete surfaces must be dry and cleaned to remove all traces of mould oil, curing compounds, dirt, dust, efflorescence, mould, algae, grease, oil asphalt, paint, lacquers, or other coatings or any other materials that would prevent penetration.

Acceptable cleaning methods include shot or sand blasting, high-medium pressure water blasting, or grinding. An ICRI 310.2R CSP 3 – 5 is preferred for best penetration.

All delaminated, lose or spalled concrete must be removed and repaired with an approved product from Sika's concrete repair range. Repair mortars must be properly cured and obtain 80% of their design strength.

Sikagard®-8500 CI can, as an additional protective measure, be applied directly to exposed rebar before repair work commences.

Non-moving shallow shrinkage cracks (<0.3 mm) with no structural significance are simply treated with multiple coats or ponding of Sikagard®-8500 CI.

Other cracks or failed joint sealants should be routed clean and treated with Sikagard®-8500 CI before being filled with suitable joint sealant from the Sikaflex® poduct range.

MIXING

Sikagard®-8500 CI is a ready to use product. Do not mix or add anything into the material. Simply shake the jerry can before opening.

APPLICATION

  1. Use Sikagard®-8500 CI as supplied. Do not alter or dilute the product in any way.

  2. During application, precautions should be taken to protect the surrounding area from overspray and run-off.

  3. Apply Sikagard®-8500 CI to dry concrete. Air and concrete temperatures must be between +5 °C and +38 °C. Lower or higher application temperatures require prior written approval from Sika's Technical Service.

  4. Apply Sikagard®-8500 CI to all concrete surfaces, including repairs, in a multiple coat application. Sikagard®-8500 CI can be applied with low pressure, non-atomizing spray equipment with a wet fan-type spray nozzle, or by brush or roller. Sprayers should be fitted with solvent-resistant hoses and gaskets. The product can also be poured when pre-treating cracks in horizontal surfaces. Allow a minimum of 15 minutes between coats but do not re-coat before previous application is visibly dry.

  5. Most applications require two or three coats applied at a rate of 180 - 230 ml/m² each. Apply minimum 600 ml/m² in total. The exact amount of Sikagard®-8500 CI will vary due to concrete porosity, application environment and with the degree of corrosion, chloride content of the concrete and the severity of expected service conditions. Contact your Sika representative to discuss specific project requirements.

  6. Sikagard®-8500 CI only reacts with mineral based substrates. Therefore, it does not react inside the container or application pump. As long as it is kept in its original container or inside a clean sealed pump, it can be used when ever needed during its shelf life. 

CURING TREATMENT

It is recommended that any surface treated with Sikagard®-8500 CI to be left undisturbed for a minimum of 4 hours in order to allow proper penetration.

CLEANING OF TOOLS

After use all equipment should immediately be cleaned with any organic solvent. 

 

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