Conbextra HF

High-flow, non-shrink, cementitious grout conforming to the requirements of BS EN 1504-3 Class R4 and BS EN 1504-6: Anchoring of reinforcing steel bar.

Conbextra HF is used for free flow, non-shrink, cementitious grouting of gap thicknesses 10 to 100 mm.

Recommended applications include:
Large stanchion baseplates
Joints between pre-cast concrete panels
Pumped grouting applications
Grouting applications where pouring access is restricted
Anchoring of reinforcing steel bars
Installation of tie bars

Highly flowable
High early age strength
Chloride free
Suitable for pumping
Conbextra HF complies with LU Standard 1-085 ‘Fire Safety Performance of Materials’.

Conbextra HF is supplied as a ready to use dry powder. The addition of a controlled amount of clean water produces a freeflowing grout for gap thicknesses up to 100 mm. In addition the low water requirement ensures high early strength and long-term durability.
Conbextra HF is a blend of Portland cements, graded fillers and chemical additives. The filler grading produces a highly flowable grout which will not segregate or bleed.

Specification clause
The grout shall be Conbextra HF, a pre-bagged, single component cementitious material which conforms with the requirements of BS EN 1504-3 class R4 and BS EN 1504-6.
The grout shall fully conform to the requirements of US Army Corps of Engineers Specification for non-shrink grout CRDC621-82A

It shall be mixed with clean water to the required consistency and not exhibit bleed or segregation
A volumetric expansion of up to 1% shall occur while the grout is in a plastic state by means of a gaseous system.
The compressive strength of the grout must exceed 40 MPa at 7 days and 65 MPa at 28 days.
The storage, handling and placement of the grout must be in strict accordance with the manufacturer’s instructions.