Five Star Cementitious Underwater High-Strength Grout is a precision-grade, cement-based system designed to deliver reliable structural support in underwater and marine construction applications. Engineered for demanding environments where structures are exposed to saltwater, freshwater, or brackish conditions, this high-strength formulation provides consistent performance and long-term durability. With excellent pumpability and flow characteristics, it easily fills spaces around piles, structural foundations, and anchor systems — without the need for complex underwater placement equipment.
This grout reaches 3,500 psi compressive strength in just 24 hours and achieves 8,500 psi at 28 days, helping reduce project timelines while maintaining structural integrity. Its positive expansion characteristics and migrating corrosion inhibitors ensure dimensional stability and protection against harsh marine environments over time. Ideal for marine construction and restoration projects, Five Star Underwater High-Strength Grout simplifies underwater installation while maintaining industry-grade mechanical performance under dynamic loading conditions.
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Key Features of Underwater High-Strength Grout
- High Early Strength
Achieves 3,500 psi compressive strength in 24 hours; full cure reaches 8,500 psi with 2,000 psi bond strength. - Underwater Placement
Can be placed via tremie, pump, or pour methods in submerged conditions without washout. - Non-Shrink Properties
Exhibits positive expansion for shrink compensation, meeting ASTM C 1107 and CRD-C 621 specifications. - Corrosion Resistance
Contains migrating corrosion inhibitors for superior protection in marine environments. - Multi-Environment Durability
Withstands exposure to saltwater, freshwater, and brackish water conditions. - Extended Working Time
Provides 60 minutes of working time at 70°F, allowing for proper placement and finishing.
Recommended Applications for Underwater High-Strength Grout
Five Star Underwater High-Strength Grout is engineered for marine contractors and engineers tasked with maintaining critical underwater infrastructure under challenging conditions. Its pumpability and non-shrink characteristics make it especially suitable for pile restoration, structural anchoring, and marine foundation applications where access is limited and structural performance must be maintained.
Ideal Applications Include:
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- Pile repair, rehabilitation and restoration
- Grouting underwater structures and pile jacket fill material
- Installation of anchors and dowels in submerged conditions
- Grouting areas subject to freshwater, saltwater or brackish exposure
- Marine structure repairs and strengthening
- Underwater foundation stabilization
- Seawall and bulkhead restoration
Technical Specifications – Five Star Cementitious Underwater High-Strength Grout
Cement-based non-shrink grout for underwater pile restoration and marine applications.
8,500 PSI 28-Day Strength
Underwater Placement
ASTM C 1107 Compliant
60 min Working Time
Salt & Seawater Resistant
Non-Shrink Formula
Corrosion Inhibitors
Tremie/Pump/Pour Placement
Frequently Asked Questions
What is the recommended placement method for Underwater High-Strength Grout?
It can be placed via tremie, pump, or pour methods. For placement thicknesses less than 1 inch or greater than 6 inches, contact Five Star Products’ technical service center.
How long before structures can be loaded?
Under typical conditions (70°F), it reaches 3,500 psi in 24 hours and continues to gain strength, reaching 8,500 psi in 28 days.
Can it be used in saltwater environments?
Yes. It is specifically designed for salt and seawater resistance with migrating corrosion inhibitors for enhanced protection.
What surface preparation is required?
All surfaces must be free of marine growth, oil, grease, and contaminants. Concrete must be clean, sound, and roughened. For non-underwater applications, presoak surfaces for 8-24 hours.
How is it mixed and applied?
Mix thoroughly for 4-5 minutes to uniform consistency with a mortar mixer. Do not exceed maximum water content. Working time is 60 minutes at 70°F.
What’s the shelf life?
One year in original unopened packaging when stored in dry conditions; high humidity will reduce shelf life.
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