Structural Repair H

Description:

Cemix Structural Repair H is a high performance fibre reinforced, polymer modified concrete repair mortar & topping for concrete repairs in 5mm - 100mm deep horizontal applications. It is used for remedial work & toppings on concrete where high performance & durability are required.

Typical Applications & Uses:

  • Horizontal repairs to concrete structures & pavements
  • Toppings on sound concrete slabs
  • Factory & commercial slab repairs
  • Bridge deck repairs
  • Marine structure deck repairs
  • Water retaining structure slab repairs

Advantages:

  • One component
  • 5mm - 100mm depth applications
  • Horizontal repairs & toppings
  • Fibre reinforced
  • Shrinkage compensated
  • Polymer modified
  • Short curing times
  • High bond strength
  • Durable
  • Waterproof
  • Impermeable to water borne aggressors such as chloride ions
  • Improved abrasion resistance

20kg bags

Durability enhancer, steel protection & waterproofing:

Cemix® Structural Repair H contains an integral crystalline concrete durability enhancer & waterproofing material, which further protects & waterproofs the mortar in-depth by making it completely impermeable to water borne aggressors such as chloride ions. This admixture permanently protects the mortar & imbedded structural steel from long-term corrosion & deterioration.

Substrate Preparation:

Repairs:

Concrete substrates should be sound & roughened to ensure a good bond. They should be uncoated & clean, free from all contaminants, loose particles, dirt, oil, mould, curing compounds, sealers & paints etc. Acid washing, rough honing or scabbling & then water blasting is required to prepare the surface depending on substrate condition. Washing with soap & water blasting may also be required if oil is present. Cracks should be repaired with a suitable Cemix® repair product. The better the substrate preparation & condition the better the end result. The concrete substrate should ideally be at least 3 months old. Cemix® Structural Repair H can be used from 5mm to 100mm in depth, however for a durable repair in demanding applications, cut a square or rectangular perimeter edge around the repair at least 20mm in depth. Remove all oxidation from exposed rebar & ensure that there is at least 25mm (or ‘finger room’) behind each rebar. For large volume voids & repairs above 50mm in depth, reinforce the repair with steel mesh.

Toppings:

Concrete substrates should be sound & roughened to ensure a good bond. They should be uncoated & clean, free from all contaminants, loose particles, dirt, oil, mould, curing compounds, sealers & paints etc. Acid washing, rough honing or scabbling & then water blasting is required to prepare the surface depending on substrate condition. Washing with soap & water blasting may also be required if oil is present. Cracks should be repaired with a suitable Cemix® repair product. The better the substrate preparation & condition the better the end result. The concrete substrate should ideally be at least 3 months old. For toppings above 50mm in depth, reinforce the topping with steel mesh.

Movement / Control Joints:

Repairs:

Honour any control joints in the concrete substrate – do not apply product over control joints.

Toppings:

Mimic control joints in concrete substrate up into the topping. Install control joints in topping. Recommended control joint spacing is 4m x 4m. Max spacing 5m x 5m. Control joints are required at topping penetrations & distinct depth changes in the topping.

Mixing:

Mix whole bags of product. Add 2.2L of water to mixer & then add product gradually to water. Add rest of water slowly whilst mixing until the desired consistency is achieved. Maximum total water is approximately 2.7L per 20kg bag. Mix thoroughly for 3 - 4 minutes using a drill & paddle or mechanical mortar mixer. Do not mix more product than can be mixed, placed & finished in 45 minutes. In hot weather consider using chilled mixing water. In very cold weather consider using warm mixing water.

Application:

Repairs:

Dampen the concrete substrate & then thoroughly prime the entire surface with Cemix® Multibond brushed undiluted into the surface just prior to mortar application. Firmly push the Cemix® Structural Repair H into the surface to obtain a wet bond, while the Cemix® Multibond is still wet. Do not let the Cemix® Multibond dry. Application is from one side of the repair to the other completely filling the cut out void. Cemix® Structural Repair H can be used from 5mm - 100mm depths, however for a durable repair in demanding applications, apply product to a minimum depth of 25mm. Firmly compact mortar into void. Screed & trowel finish as required.

Toppings:

Dampen the concrete substrate & then prime it with Cemix® Multibond brushed undiluted into the surface just prior to mortar application. Firmly push the Cemix® Structural Repair H into the surface to obtain a wet bond, while the Cemix® Multibond is still wet. Do not let the Cemix® Multibond dry. Application is from one side of the floor to the other. Cemix® Structural Repair H can be used from 5mm - 100mm depths, however for a durable topping in demanding applications, apply product to a minimum depth of 25mm. Firmly compact the topping. Screed & trowel finish as required.

Curing:

It is very important to prevent early plastic state moisture loss prior to the product setting. Cure product thoroughly after it has set by keeping it wet & covered for at least 7 days. Avoid product freezing for at least 3 days.

Technical Data:

Appearance – Sand/Cement grey powder.

Strength (MPa) - 35MPa @ 7 days; 50MPa @ 28 days

Application Temp- 5ºC - 30ºC

Yield / Coverage - Approximately 10.7L or 0.0107m3 per 20kg bag.

Packaging - 20kg bags

Working Time – 45 minutes at 20ºC

Bond Strength – > 3MPa

Thermal Coeff. Of Exp – 9.0 x 10-6 mm/mm/ ºC

Chloride Ion Permeability – < 1000 coulombs

Working Time – 30 minutes @ 20ºC

The data shown above reflects typical results based on laboratory testing under controlled conditions. Reasonable variations may occur on site.

Limitations:

Substrate Temperature - +5°C min. / +30°C max.

Ambient Temperature - +5°C min. / +30°C max.

Cleaning:

Clean all tools with water & brush immediately after use.

Storage:

Can be stored in its original packaging in a dry place well sealed for a period of six (6) months after production. Do not store opened bags.

Precaution:

For large volume pours and application depths deeper than 100mm, seek technical advice. Use chilled water to counteract the heat and hydration and prevent thermal cracking or seek technical advice from the Cemix technical team.