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.