epidermix 345 Methodology

Print Friendly

Slow-set epoxy bonding agent

METHODOLOGY 

epidermix 345 

Slow-set epoxy bonding agent

All the relevant product data sheets are to be read for additional information like pot life, mixing instructions, surface preparation, ventilation, temperature application limitations, etc.

EPOXY BONDING AGENT 

epidermix 345 “Slow-set” a two-component, pigmented, solvent-free epoxy resin bonding agent shall be used to bond new concrete to old concrete. The product shall achieve 50 MPa compressive strength, 20 MPa tensile strength, 35 MPa flexural strength and 25 MPa shear strength at 7 days, @ 20ºC.

DESIGN CRITERIA 

epidermix 345 “Slow-set” is designed to have the following overlay times and pot life:

Overlay Times Pot Life: 

24 hours @ 20ºC 5 hours @ 20ºC

12 hours @ 30ºC 2.5 hours @ 30ºC

8 hours @ 35ºC 1.5 hours @ 35ºC

REPAIR AREAS 

The areas to be repaired are to be shown on the drawings or as indicated by the Client’s Representative.

The areas are to be clearly marked out on site and agreed with the Client’s Representative before proceeding.

The areas may be adjusted by the Client’s Representative as work proceeds according to the conditions found.

The surfaces adjacent to and of areas for repair shall be cleaned to remove any dust, unsound material, plaster, oil, paint, grease, corrosion deposits, organic growth, etc.

Within the repair area, the concrete cover to reinforcement links or main bars shall be determined by cover meter. A small area shall be chiselled out and the concrete cover and the depth of deteriorated concrete confirmed by measurement.

SUBSTRATE PREPARATION 

Clean all surfaces and remove any dust, unsound material, plaster, oil, paint, grease, corrosion or algae.

Roughen the surfaces, remove any laitance and expose aggregate by light scabbling or grit-blasting.

REINFORCEMENT PREPARATION 

All exposed reinforcement shall be cleaned of corrosion products by wet grit blasting or other approved means to achieve a surface finish to comply with a standard of steel cleanliness such as SA2••• (BS7079:Part A1/ISO8501) or as directed by the Client’s Representative. Special care shall be taken to clean out properly any pitting which may have occurred in the steel bar.

When the corrosion products have been removed and if directed by the Client’s Representative, the diameter of the reinforcing bar(s) shall be measured. If considered necessary by the Client’s Representative the existing reinforcement shall be cut out and replaced and/or additional bars added in accordance with instructions. Any deep pitting of the reinforcing bars shall be brought to the attention of the Client’s Representative.

Reinforcement damaged during the removal of concrete or the preparation process shall be brought to the attention of the Client’s Representative and if required, shall be repaired or replaced.

Where the presence of chloride is determined, it is essential that the cleaning process is completed by pressure washing with clean water the total exposed areas of reinforcing steel to ensure the removal of all residual contamination from the pitted surface of steel.

REINFORCEMENT PRIMING 

Immediately following preparation and cleaning, the reinforcing steel shall be primed with dura.®rep ZR primer single component epoxy primer complying with the relevant parts of BS4652, 1971 (1979) Specification For Metallic Zinc Rich Priming Paint Type 2.

The dura.®rep ZR primer shall be brush applied to the cleaned reinforcement ensuring that all exposed steel is fully coated. Special attention shall be paid to the backs of the steel bars and where steel bars are tied together. It is essential that this coat is continuous with that of any adjacent repaired area where zinc-rich primer has been used. Avoid excessive over-painting onto the concrete and allow it to dry.

MIXING 

Care should be taken to ensure that the epidermix 345 is thoroughly mixed. The ‘base’ and ‘hardener’ should be stirred separately before mixing to disperse any settlement. The entire contents of the ‘hardener’ tin should then be poured into the ‘base’ tin and the two materials thoroughly mixed using a suitable slow-speed drill and mixing paddle for 2 minutes until a fully uniform colour is obtained. The sides of the tin should then be scraped and mixing should continue for a further 2 minutes.

APPLICATION 

Only fully integrated mixes of epidermix 345 shall be used and within the pot life of the product.

epidermix 345 “Slow-set” can be applied by brush or spray to the prepared surfaces, @ 10 m² per 5kg pack. A minimum of one hour shall elapse before the overlaying concrete or screed is applied to the primed substrate.

Apply epidermix 345 to the primed surface with a wood float, or by gloved hand.

TEMPERATURE 

At 20°C the initial hardness of epidermix 345 occurs approaching 24 hours and the full cure is at 7 days. Below 20°C the curing time increases and the minimum application temperature is 5°C.

In cold weather the epidermix 345 and should be stored in warm conditions.

At ambient temperatures above 30°C, the material should be stored in the shade or in air-conditioned environment for 12 hours before use.

CLEANING 

epidermix products should be removed from tools, equipment and mixers with abe® super brush cleaner immediately after use. Hardened material can only be removed mechanically.

PRODUCTS REQUIRED 

  • abe® super brush cleaner 
  • dura.®rep ZR primer 
  • epidermix 345 

EQUIPMENT NEEDED 

100 mm paint brush

IMPORTANT NOTE 

This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® Construction Chemicals Limited endeavours to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e.® products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.

FURTHER INFORMATION 

Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total requirements. a.b.e.® Construction Chemicals Limited has a wealth of technical and practical experience built up over years in the company’s pursuit of excellence in building and construction technology.