Product Data Sheet Show all documents

Parex Thixotropic Joint Filler (TJF)

Stay-in-place pumped mortar, specially formulated for filling gaps and voids in precast concrete construction without the need for shuttering

A pumped mortar purpose-designed for filling joints and gaps in precast concrete units without the need for formwork. The thixotropic qualities of the mortar and non-shrink additives allow it to stay in place without slumping and to provide a complete high strength bond between sections. Before forming an initial set, it can be tooled off to provide a complete and smooth joint. The material can be used for placing in horizontal and vertical gaps of 5mm to 100mm where a cementitious mortar infill is required and flow grouting is inappropriate. It requires only the addition of water on site and is mixed using a drill and paddle followed by hand or mechanical pump placement. For larger jobs mixer pumps can be used. Parex Thixotropic Joint Filler (TJF) is chloride-free and can be safely used in contact with steel reinforcement.  

  • Easily mixed and applied. 
  • Chloride-free. 
  • Wide application range (gaps 5 to 100mm). 
  • Shrinkage compensated.
  • High strength.
  • Thixotropic.
  • Low sag nature.
  • Reaction to Fire: EuroClass A1. 
Product Data Sheet Show all documents

Usage

  • Structural support between and beneath precast concrete elements.
  • Permanent in situ shuttering in joints between precast concrete elements which will be post-grouted.
  • Rapid placement using m-tec Duo-Mix mixer-pump systems.

Advantages

  • Easily mixed and applied. 
  • Chloride-free. 
  • Wide application range (gaps 5 to 100mm). 
  • Shrinkage compensated.
  • High strength.
  • Thixotropic.
  • Low sag nature.
  • Reaction to Fire: EuroClass A1. 

Packaging

25kg bags

Colour

Grey powder

Product Details

Product Information

Composition

Portland cement based powder mix including special thixotropic and shrinkage compensating components.

Shelf life

6 Months

Storage conditions

Store properly in dry conditions in undamaged and unopened original sealed packaging.

Density

~2100 kg/m3

 
Technical Information

Compressive strength

24 Hours

~35 N/mm2

7 Days

~60 N/mm2

28 Days

~70 N/mm2

Reaction to fire

Class A1

Application

Application Information

Mixing ratio

4.5 to 5.0 Litres per 25 kg bag

Layer thickness

5mm minimum / 100mm maximum

Ambient air temperature

+5°C minimum / +35°C maximum

Substrate temperature

+5°C minimum / +35°C maximum

Initial set time

~210 minutes at 20°C

Final set time

~240 minutes at 20°C
Consumption

Yield

Each 25kg bag will yield approximately 13.5 litres of mixed material.
Application steps

MIXING

The water requirement to produce the mortar is 4.5 to 5.0 litres of water. 

      
Mixing Prior to Pumping
Pour the required quantity of water into a suitable mixing vessel. Slowly add the powder to the water whilst continuously mixing. Mechanical mixing is recommended. Suitable mixers include a slow speed high torque drill with a Mortar Stirrer, or a forced action mixer such as Creteangle or Rojo. 

      
m-tec Duo-Mix Mixing and Pumping
Mixer pumps, such as the m-tec Duo-Mix 2000 will mix the Parex Thixotropic Joint Filler (TJF) on the pump unit prior to pumping into place. Load the Parex Thixotropic Joint Filler (TJF) into the mixer-pump and use in accordance with the equipment manufacturer’s instructions.

APPLICATION

Hand mixed mortar should be loaded into a suitable pump unit and placed in accordance with the pump supplier’s instructions. Duo-Mix units will allow the mortar to be mixed and placed continuously from the single unit. Pumping rates of some 12 to 15 litres per minute have been found to be satisfactory. At these rates the build up of hydrostatic pressure in vertical joints will not cause the grout to flow from openings in the jointing area.
Ensure complete filling of the gap and then finish the exposed surface with a dampened steel trowel.

CURING TREATMENT

Parex Thixotropic Joint Filler (TJF) may be applied at temperatures between 5°C and 35°C. In moderate ambient conditions no special curing is necessary. Under hot and high drying conditions curing of exposed surfaces should be undertaken in accordance with good concrete practice.

CLEANING OF EQUIPMENT

Clean all tools and application equipment with water immediately after use. Hardened/cured material can only be mechanically removed.

 

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