Three part epoxy grout for waterproofing of pile heads

Product Description

PREPRUFE® Grout EG 75 is a high performance, solvent free, impermeable epoxy grout for maintaining continuity of PREPRUFE® waterproofing systems at pile heads and similar structural penetrations. The product comprises of a base epoxy resin, an epoxy hardener and graded mineral aggregates. The three components are supplied pre-measured for easy on site mixing at the correct ratio.


  • Waterproofing of pileheads and pilecaps
  • Waterproofing of structural penetrations through PREPRUFE® waterproofing systems
  • Recommended thickness range 1/2" (13mm) - 3" (75 mm)

System Components

To achieve continuity of Preprufe waterproofing systems at pile heads and similar structural penetrations, the following system components are needed.

Consult with your GCP Applied Technologies Technical Representative for guidance on proper detailing.

Product Advantages

  • Water resistant adhesion to all products in the PREPRUFE® sheet waterproofing system
  • Impermeable
  • High bond to substrate
  • Rapid strength gain
  • High compressive, flexural and tensile strengths
  • Fluid consistency
  • Solvent free
  • No segregation or shrinkage
  • Highly resistant to acids, alkalies, common salts and sulphates
  • Easy mixing and placing


Surface Preparation:

All surfaces to be in contact with PREPRUFE® Grout EG75 shall be free of oil, grease, laitance and other contaminants. Concrete must be clean, sound, and roughened to ensure a good bond. For optimum adhesion, concrete should be visibly free of surface moisture. Remove rust from any reinforcement that will be in contact with the epoxy grout.


Formwork may be utilized for more accurate placement and is required to be constructed at vertical surfaces to obtain min. 1/2 inch thickness. All removable formwork should be coated with a mineral oil or water based release agent, before the grout is placed.

Contact your GCP Applied Technologies Technical Service Representative for further information

Mixing and Placing:

For optimum performance, all components should be conditioned to between 70°F and 80°F (21°C and 27°C) prior to use. Using a clean metal pail, pour component A into the pail, add component B and mix using a clean paddle mixer and slow speed drill (max 400 rpm) for two minutes. Slowly add the full contents of component C, mix continuously, and scrape unmixed material from the side and bottom of pail with a trowel. Mix for a minimum of three minutes or until a flowable homogenous consistency is achieved. Working time is approximately 30 minutes when temperatures are at 70°F (21°C). Pour the grout from the pail into the forms continuously, if more grout is required, mix the next unit while the first is being poured to enable continuous placement. Finish with a trowel where necessary.

Grout temperature shall be maintained above 50°F until grout reaches required strength.


All tools and equipment may be cleaned with a water and strong detergent solution or suitable solvent before material hardens. Sand may be used as an abrasive.

Re-profiling Grout:

Where the use of cementitious re-profiling grout is necessary, use PREPRUFE® Grout CEM 100 or equivalent. Do not use other nonshrink cementitious grouts or site batched sand/cement mortars.

See separate product data sheet.

Health and Safety

Before using this product, read the product labels and comply with all health and safety advice. Further health and safety information is available from the products Safety Data Sheet (SDS) available from GCP Applied Technologies or on-line at

Supply and Storage

Component Type Packaging
A Epoxy base resin Metal can
B Epoxy hardener Metal can
C Filler Heavy duty paper bag

Store unopened in original packaging in cool, dry conditions out of direct sunlight and remote from direct heat sources. Shelf life in these conditions is 12 months from date of manufacture.

PREPRUFE® Epoxy grout EG 75 data sheet

PREPRUFE® Grout EG-75 Typical Value Test Method
Thickness range 1/2 - 3 in  
Flow at 73°F 9.8 in ASTM C 230
Flow at 113°F 11 in ASTM C 230
Pot Life at 73°F 45 mins ASTM C 308 (modified)
Pot Life at 113°F 30 mins ASTM C 308 (modified)
Peel Adhesion to PREPRUFE® > 4 pli ASTM D 3330
Compressive strength 7 day at 73°F 11,000 psi ASTM C 579
Flexural Strength 7 day at 73°F 3800 psi ASTM C 580
Tensile strength 7 day at 73°F 2200 psi ASTM C 307
Bond strength to concrete 7 day at 73°F 365 psi ASTM D 4541
Fresh Mixed Density 4.6 lbs/gal ASTM C 905-79
Water penetration None BS 12390-8
Rapid Chloride Permeability None ASTM C 1202

Note: All test results shown in this data sheet are determined under laboratory conditions, using product samples taken from inventory in original packaging, without alteration or modification.