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Fosroc Conbextra Deep Pour Grout 20kg

Code: 40-FC501070-20KG
U.O.M. - Each
Flowable, precision cementitious grout for large volume and deep pours. Fosroc Conbextra is suitable for gaps 20 mm to 500 mm thickness. Supplied as a ready to use dry powder, the addition of a controlled amount of clean water produces a free-flowing precision grout for gap thicknesses up to 500mm. In addition, the low water requirement ensures high early strength and long term durability.


Flowable, precision cementitious grout for large volume and deep pours. Conbextra is suitable for gaps 20 mm to 500 mm thickness. It is formulated to minimise segregation and bleeding for deep grout pours. Conbextra Deep Pour is a blend of Portland cements, graded fillers and chemical additives which impart controlled expansion in both the plastic and hardened states. The filler grading minimises segregation and bleeding over a wide range of application consistencies.

Maximum filler aggregate size contained in Conbextra Deep Pour is 5 mm.


  • Unique non-metallic dual expansion system compensates for shrinkage in both the plastic and hardened states
  • Excellent initial flow and flow retention
  • High ultimate strength and low permeability ensure durability of the hardened grout
  • Hydrogen-free gaseous expansion
  • Chloride free
  • Suitable for pumping or pouring over a large range of application consistencies and temperatures
  • Ideal for:

  • Deep pours up to 500mm deep

    Surface Preparation:

    The substrate surface must be free from oil, grease or any loose material. Bolt holes or fixing pockets must be blown clean of any dirt or debris.

    Several hours prior to grouting, the area of cleaned foundation should be flooded with fresh water. Immediately before grouting takes place, any free water should be removed. Particular care should be taken to blow out all bolt holes and pockets.

    It is essential that the base plate is clean and free from oil, grease or scale. Air pressure relief holes should be provided to allow venting of any isolated high spots.

    The minimum gap for pouring Conbextra Deep Pour is 25 mm. Formwork should be constructed to be leakproof as Conbextra Deep Pour is a free flowing grout. This can be achieved by using foam rubber strip or construction silicone sealant beneath the constructed formwork and between joints. The unrestrained surface area of the grout must be kept to a minimum. Generally the gap width between the perimeter formwork and the plate edge should not exceed 150 mm on the pouring side and 50 mm on the opposite side. There should be no gap at the flank sides.


    A forced-action mixer is essential. Larger quantities will require a high shear vane mixer. Do not use a colloidal impeller mixer. It is essential that machine mixing capacity and labour availability is adequate to enable the grouting operation to be carried out continuously. This may require the use of a holding tank with provision for gentle agitation to maintain fluidity. The selected water content should be accurately measured into the mixer. Slowly add the total contents of the Conbextra Deep Pour bag, mix continuously for 5 minutes, ensuring a smooth, even consistency is obtained.


    Place the grout within 15 minutes of mixing to gain the full benefit of the expansion process. Conbextra Deep Pour can be placed in thicknesses up to 500 mm in a single pour. Any bolt pockets must be grouted prior to grouting between the substrate and the base plate. Continuous grout flow is essential. Sufficient grout must be available prior to starting and the time taken to pour a batch must be regulated to the time taken to prepare the next one. The mixed grout should be poured only from one side of the void to eliminate the entrapment of air or surplus pre-soaking water.

    Where large volumes have to be placed Conbextra Deep Pour may be pumped. A heavy duty diaphragm pump is recommended for this purpose. Screw feed and piston pumps may also be suitable.

    On completion of the grouting operation, exposed areas should be thoroughly cured. This should be done by the use of Concure curing membrane, continuous application of water and/or wet hessian.

    Clean Up:

    Remove from tools and equipment with clean water immediately after use. Cured material can be removed mechanically.


    Shelf life of 12 months from date of manufacture if kept in a dry store in the original, unopened bags or packs.


    Allowance should be made for wastage when estimating quantities required. A 20kg bag yields 10 litres of flowable consistency.

    Additional Information

    CODE 40-FC501070-20KG
    4 Hour Delivery Call To Confirm
    U.O.M Each
    Pallet Quantity 48
    Brand Fosroc
    Range / Model Conbextra
    Size 20 kg
    Appearance / Composition Powder
    Application Thickness (mm) 20 mm up to 500 mm
    Cure Time Initial - 6.5 hours, Final - 9 hours
    Compressive Strength at 7 days (MPa) 45 (plastic), 42 (flowable)
    Compressive Strength at 28 days (MPa) 65 (plastic), 60 (flowable)
    Approvals & Certifications AS1478.2-2005 Appendix E Early Volume Change
    AS1478.2-2005 Table Consistency
    Rapid Mortar Bar Test (RTA T363)
    Fire Rating Class A1 Non-Combustible
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