Injection Sealing Material

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Injection Sealing Material

 

Acrylic Gel Injection Sealing Material

It is an elastic 2 component acrylic injection gel, especially designed for the injection or the re-injection of injection hoses and injection packers for sealing joints and cracks in concrete. The gelification does not occur suddenly as with other acrylic gels, but the viscosity increases in a linear way. This makes it possible to control the re-injection process of the injection hose.

It has an excellent adhesion to the concrete surface and while in contact with water, the total free expansion can be a maximum of 250% of the original volume and the ultimate elongation can be a maximum of 200%.

It has the ability to absorb shrinkage and expansion of the injected joint or crack due to thermal fluctuations, loading or vibration.

Areas of Application

  • All areas where construction joints are present and require sealing against water or require a particular joint sealing process.
  • Water excluding and water retaining structures.
  • Basements and below ground structures.
  • Tunnels and underground vaults.
  • Water and sewerage treatment plants.
  • Ground and elevated reservoirs and dams.
  • Suspended slabs and roof slabs.
  • Water tanks and pools.

Advantages

  • Excellent penetration capacity due to water like viscosity, giving instant filling of injection hose and the joint as well as hairline cracks and capillaries.
  • Viscosity is increased gradually and not instantly, thus less problems in processing.
  • A very high sealing effect with long term durability and integrity.
  • High elasticity and adhesion to construction materials such as concrete, masonry and steel.
  • Can be processed as one (1) or two (2) components.
  • Reaction time for curing can be adjusted to suit but there are limitations.
  • Contains no toxic solvents, is non-flammable and is suitable for use in potable water applications.
  • Good general chemical resistance characteristics to diesel, mineral oils, alkaline and concrete aggressive liquids.

 

Composition and Properties of Components

Component A1 is an aqueous methacrylate solution. Component A2 is a catalyst based on amines.

Component B1 is water and is supplied by the end user/installer. Component B2 is an initiator, which is soluble in water. After mixing, the initiator triggers the polymerisation of the methacrylate, yielding an elastic gel which is capable of absorbing and desorbing water. The gel mass is chemically resistant against most organic and inorganic liquids.

 

Technical Features

DENSITY RESIN (A1): 1,12 kg/ℓ

DENSITY CATALYST (A2): 1,11 kg/ℓ %

ACTIVE COMPONENTS: 42 – 48%

MIN. PROCESSING TEMPERATURE: 5°C

VISCOSITY (20°C): 50 – 65 mPas

COLOR (upon mixing of all components): PINK

CURING TIME (25°C): 10 – 15 mins

 

Packaging

The system consists of three (3) components supplied as a kit (A1, A2 and B2) but four (4) components are required for mixing, where B1 (Water) is supplied by the end user.

A1 : Resin (acrylic resin) – 10kg (8.93ℓ )

A2 : Kat (catalyst resin) – 0.5kg (0.45ℓ)

B1 : Water (supplied by end user) – 9.16ℓ

B2 : Init (initiator) – 18gms

 

Mixing and Processing

Two solutions of A and B are to be prepared for the application for injection, as follows:

Solution 1 (A) : Resin (A1) with Kat (A2)

Solution 2 (B) : Water (B1) supplied by the end user with Init (B2)

Note : The shelf life of Solution 1 (A) and Solution 2 (B), once mixed as above, is 24 hours

Note : When Solution 1 (A) and Solution 2 (B) are combined for injection, they become 18.32ℓ of processible material

Mix the components of A1 & A2 and B1 & B2 into their respective solutions of 1 & 2 (A & B) thoroughly. No metal stirrers should be used for mixing of the solutions, but only plastic or wooden paddles. Mixing time of Solution 1 (A2 with A1) and of Solution 2 (B2 with B1) should be for approximately 10 minutes. The temperature of the added B1 component (water) is to be at about 25°C.

In order to obtain an acrylic gel, the two (2) Solutions (A & B) must be mixed together in a proportion of 1:1 (volume). The reaction time at 25°C, will be approximately 10 minutes.

The reaction time decreases if the temperature is higher and increases when the temperature is lower. Please consider that site conditions have a major influence on the reaction time. We strongly advise to diagnose the reaction time on site depending on the predominant conditions before injecting. A site
‘reaction time mixing test’ should be performed prior to the injection process to indicate the actual reaction time of the kit, based on the current site temperature conditions.

Note : Hot & cold temperatures and hot & cold substrates can affect the gelling time.

It is recommended to be injected into the injection hose with a two-component (2K) or three-component (3K) manual, electric or pneumatic pump. The machine parts that come into contact with the gel must be in stainless steel.

If you require the injection hose to be re-injectable, you must flush out fully from the injection hose under low pressure (1 bar) with water, prior to the reaction (curing) time. It can be used in certain injection hose systems to give re-injection capabilities.

 

Simple Injection Process For Injection Hose System

  1. Check the continuation of the injection hose by flushing with water or with air.
  2. The injection hose is injected via the injection point until the injection material is fully flowing from the vent end (opposite end of injection hose). This vent end is closed by means of an injection nipple as soon as the injected material flows freely (without air pockets) from the vent.
  3. The flow and extent of the injection material in the concrete joints can be monitored during the injection process by means of the injection pump’s pressure gauge, if using a 2K or 3K pump. If using a 2K or 3K manual pump, then monitoring is done manually, by feel and vision.
  4. The injection process is continued until constant pressure has been reached. Constant pressure indicates that the concrete joint is absorbing no more injection material and thus signalling the end of the process.
  5. Any injection material still within the injection hose is simply flushed out by means of a water pump and is a simple and easy process. Flushing must be undertaken prior to its curing to gel form, otherwise the injection hose will be blocked.
  6. On completion of the flushing process, the injection hose is ready for future re-injections, if required. We recommend the use of a 3K pump as the third container is water and is used for flushing the hose after each injection process.

Note: Installation and injection method processes are available upon request. Fully trained specialist contractors are available to perform the installation and injection processes for the injection hose system.

  1. Water affected joint
  2. Discharge of grouting material into the joint
  3. Injected joint with injection material
  4. Waterproof  flushed out ready for future re-injection

 

Limitations

If the joint, crack, or void in the concrete, is subject to a high flow of water pressure, then it may not be suitable to use as the reaction time may be too slow to seal and the material may be initially washed from the joint. Consult us for a site substrate evaluation, prior to the undertaking of the injection process.

Cleaning

The product if not cured, can be removed with cleaner or water. If cured, then depending upon the substrate, will depend upon the tool required to be used to remove the cured gel, as it adheres very well to most materials.

Storage and Shelf Life

Store in a dry and cool place below a temperature of +30°C and keep away from all sources of heat and sunlight. The shelf life is 12 months in an unopened condition and if stored as per recommendations.

Health and Safety Information

As with all construction chemical products, caution should be exercised. Protective clothing such as gloves and goggles should be worn. Treat and wash any splashes to the skin or eyes with fresh water immediately. Should any of the products be accidentally swallowed, do not induce vomiting but call/seek for medical assistance immediately.

In confined spaces or in still air conditions, the use of a ventilation fan or suitable respirator should be used, and the advice and approval of the Site Safety Supervisor is essential. For further information or advice on health and safety precautions, safe handling, storage and correct disposal of products, please refer to the most recent product Safety Data Sheet (SDS), which is available upon request.

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