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.

Uses
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

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

Description
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.