UHPC - Offshore structural repair

UHPC (Ultra High Performance Concrete) offshore grouting products are a pumpable and developed for all kind of offshore application and has been used widely in connection with structural strengthening and corrosion protection of offshore platforms.

Such UHPC grouting products have been used offshore in connection with

• Strengthening of intact tubular members
• Reinforcement of joints
• Repair of damaged members
• Pile-sleeve connections
• Strengthening of double skin sections

An example of a spectacular application of such solutions with respect to member repair is for a
member having experienced hydrostatic collapse,
where the member was re-inflated and filled with
ultra high performance grout. In another case
our solutions were applied in connection with a
pile-driving refusal (changing the intended shear
key connection to a plain pipe connection).
UHPC grouting high strength material was used
as grout material in stead of the intended
conventional grout. In the above selected cases
the design strength of the members was
re-established due to the extreme effect offered
by high strength materials and at the same time the solutions was economically attractive.

One of the main advantages of using UHPC grouted solutions in connection with repair is the easy accommodation of geometrical irregularities. Structural components subjected to some kind of damage
(from installation, impact or accident) often
show some dents or imperfections. The use of ultra high
performance grout in connection with repair
improves the performance hereof as the UHPC
grout serves not just as a filling material but
as a strong structural component.

UHPC grouting materials are suitable for

casting both above and below water. Due
to viscous consistency of the mixed materials
there is no risk of washing out cement
particles or mixing with water when cast
below sea level. 

The UHPC grouting products for offshore
have been developed having very low
shrinkage so that the grout and surrounding
steel remains in physical contact after curing.
Further, these products has been developed
to show limited heat development during
the hardening process eliminating the risk
of thermal cracking. 

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