ISO 9001:2015
Underwater
Underwater Repair
SKU 29225
Structural Concrete UWHP®
Hand-applied, rapid strength underwater repair. Permanent concrete repair for structures below the waterline — setting and gaining strength in as little as 3 hours.
Quotes returned same business day · Technical support at +971 56 408 1507
Five Star Structural Concrete® UWHP (Underwater Handpack) is a rapid-strength, hand-applied underwater repair material that sets quickly even in cold water. It is designed for the repair and rehabilitation of concrete structures below the waterline, where access is difficult and conventional form-and-pour repairs are impractical.
The material bonds to damp or submerged concrete, develops rapid early strength, and restores structural integrity to marine and hydraulic structures — including concrete piles, piers, seawalls, tanks, dams, and other underwater infrastructure.
Why crews specify it
01Hand-applied — no formwork, pumps or special equipment required
02Rapid strength gain — 17 MPa in just 3 hours, even in cold water
03Bonds to damp and submerged concrete surfaces
04Excellent in saltwater, freshwater and brackish environments
05Restores concrete piles, piers, seawalls and hydraulic structures
06Single component — mix with water and place
Where it is used
Underwater repair of concrete tanks
Underwater repair of dams and hydraulic structures
Filling underwater concrete cavities and voids
Underwater repair of concrete piles and piers
Seawall and marine structure repair
Tidal zone protection
Marine jetty and dock repairs
Typical properties at 21°C
Data reflects typical results based on laboratory testing under controlled conditions. Reasonable variations may result.
Packaging, yield and shelf life
Supplied in a 25 kg bag. Yield approximately 13.3 liters. Shelf life is one year in original unopened packaging stored dry.
Placement in four steps
1 · Surface preparation
Remove all loose, deteriorated and unsound material. Clean the substrate of marine growth, silt and contamination before placement to achieve a sound bond.
2 · Mixing
Mix with clean water to a stiff, hand-packable consistency. Do not exceed the recommended water quantity — the material must remain workable while wet enough to place underwater.
3 · Application
Press the material firmly into place with gloved hands or a trowel, filling all voids and cavities completely. Build the repair to the required profile in layers where depth demands it.
4 · Curing
The material sets and gains strength underwater. Keep the repair undisturbed during initial set; expose to service loads only after sufficient strength development.
Prior to application, read all product packaging thoroughly. For detailed placement procedures refer to Five Star® Design-A-Spec™ or call +971 56 408 1507. Contains cementitious material and crystalline silica — refer to the Safety Data Sheet before use.
Get an underwater repair quote
Send us the repair dimensions, water depth and service conditions. A specialist confirms the right system and returns pricing with lead time the same business day.
ISO 9001:2015 certified
American owned & operated
Worldwide distributor network
Explore our product range
Different working time, different geometry, different temperature. There is a Five Star repair material matched to every placement.
