High Strength Precision Grout

Ready-to-use, flowable construction grout
HB Fuller Logo - MarMac Construction Products
Shaveable & Formable Finishing Cement

MarMacʼs ProSpec® High Strength Precision Grout is a specially-formulated, ready-to-use, high strength, flowable precision grout for the repair or finishing of concrete applications. It is shaveable, formable, highly proficient in overhead jobs, and perfect for applications where shrinkage, corrosion, and staining are not acceptable.

The product can be pumped into inaccessible areas by conventional grouting methods in both interior and exterior jobs. High Strength Precision Grout combines high fluidity with early strength build, ensuring a quick job start up and thereby reducing labor costs. Common uses include precision grouting of machinery base sole plates, rolling mills, generators, anchor bolts, transfer lines, paper mills, and structural grouting of precast columns, crane rails, bridge seats, dowels, and more.

Features & Benefits
  • For interior or exterior applications
  • Early strength build
  • Ultimate flexural strength
  • High initial compressive strength
  • Water & salt penetration-resistant
  • Freeze/thaw damage-resistant
  • Non-porous & high density
  • Non-shrinking & non-staining
  • Non-metallic & non-corrosive
  • High fluidity makes it pumpable into inaccessible areas
  • Extendable by 50% with proper aggregate

High Strength
Precision Grout

  • Meets CRD-621 & ASTM 1107
  • Horizontal application
  • Structural
  • Non-shrink
  • Non-metallic
  • 1-4" thickness
  • 15 min worktime (fluid)
  • Pumpable
  • Plastic compressive strength (1 day / 28 days)
    6,000 psi / 10,500 psi
  • Flowable compressive strength (1 day / 28 days)
    5,500 psi / 10,000 psi
  • Fluid compressive strength (1 day / 28 days)
    4,000 psi / 9,000 psi

Conforms to CRD-C621 Corps of Engineers Specification for Non-Shrink Grout and ASTM C1107.

Mixing Water (per 50 lbs) 3.7 qt 4.0 qt 4.5 qt
Flow 120-125% 125-140% 20-30 sec
Initial Set 5 hrs 6 hrs 6.5 hrs
Final Set 5.75 hrs 7 hrs 7.5 hrs
24 hrs 6,000 psi 5,500 psi 4,000 psi
3 days 7,200 psi 7,000 psi 6,100 psi
7 days 8,500 psi 8,500 psi 7,500 psi
28 days 10,500 psi 10,000 psi 9,000 psi
24 hrs +0.04% +0.01% 0.00%
3 days +0.04% +0.02% 0.00%
28 days +0.06% +0.03% 0.00%
Final Set Average 0.55% 1.49% 1.23%
DO NOT: 1) overwater, 2) use in applications of high dynamic loading, 3) allow portland cement-based materials to come in direct contact with uncoated aluminum, 3) retemper grout by adding water, use as a floor topping or in large areas with an exposed shoulder around base plates, 4) add accelerators, retarders, plasticizer or other additives, apply in application thicknesses <1” (25 mm), and 5) mix more grout than can be placed in 20 minutes.

Store High Strength Precision Grout in its original, unopened container under cool, dry conditions for up to 12 months from the date of manufacture. Keep out of direct sunlight. Prior to installation, materials should be stored between 40°F (4°C) and 80°F (27°C) for 24 hours.

Preparation: All materials should be stored between 40-80°F 24 hours prior to installation. The application area must be free of unsound concrete, grease, oil, wax, sealers, paint, and any other contaminants that may act as a bond breaker. Saturate the application area with water for 12-24 hours prior, after which any excess water should be removed. Forms must be sealed to prevent water or grout escaping and provide for rapid, continuous grout placement. When placing, provide an angle in the forms high enough to assist in grouting. For pouring minimum openings of 3” for entry and 6“ for “head” are recommended. Venting must be provided to avoid entrapping air. Forms should be at least 1“ higher than the bottom of the base plate. Maintain ambient and surface temperatures between 40-95°F. Set times and strength developments are dependent on temperature. Hot temperatures will accelerate physical properties, while cold will have a retarding effect.

Mixing: Refer to the Typical Properties table for water requirements to reach the desired consistency. Only mix with clean, potable water and/or for thicker applications extend with clean SSD 3/8” pea gravel. Addition of cold water at high temperatures or warm water at low temperatures will aid in adjusting the mix temperature. Place 75% of desired mixing water, start mixter, then slowly add the dry material. After all of the powder has been added, slowly add the remaining 25% water until the desired consistency is achieved. Avoid adding excessive amounts of water that promotes segregation or bleeding of the grout. Mix mechanically with a high torque electric drill, do not exceed 600 rpm using a paddle type mixing blade or an appropriately-sized mortar mixer. Mix for 3-5 minutes to ensure a uniform, lump-free consistency and place immediately.

Application: Apply when air and substrate temperatures are between 40-90°F. Fluid-consistency working time is approximately 15 minutes at 70°F. Agitate the material as necessary within its working time to maintain workability. Shut down nearby machinery prior to and during placement. Provide vent holes where necessary. Pour and place the grout from one side of the form to eliminate air voids. A vibrator, rod, chain, or trowel may be used to assist in consolidating the grout and eliminating air voids. Use a mixer large enough to permit continuous placement before any part of the grout has set. Confine grout to ensure minimum surface exposure. Avoid vibration for 24 hours after placement. For placements greater than 4”, extend the grout with 25 lbs of washed, clean SSD (saturated surface dry) 3/8” graded aggregate per 50 lb bag. After placement, immediately trim the surfaces and edges with a trowel. Minimum application thickness is 1”. Forms may be removed after grout has hardened to an initial set.

Jobsite Testing: Jobsite strength tests must use ASTM C 1107 specifications 2” metal cube molds. Do not use cylinder molds or plastic cube molds. Control testing based on achieving the desired flow rather than water content.

Curing: Forms may be removed after the grout has hardened to an initial set and retains its shape. This time period will vary according to temperature. At this point, final finishing and curing can start. The grout should slope downward from baseplates or similar structures at a 45° angle from the lower edge. Prevent rapid water loss by covering the exposed grout surfaces with wet burlap during the first 48 hours or apply an acceptable water-based cure and seal agent.

Cleaning: Clean all tools immediately after use. Dried material must be mechanically removed.

The manufacturer requires that when its ProSpec® products are used in any application or as part of any system that includes other manufacturersʼ products, the contractor and/or design professional shall test all the system components collectively for compatibility, performance, and long-term intended use in accordance with pertinent and accepted industry standards prior to any construction. Written documents of the tests performed shall be satisfactory to the design professional and contractor. Test results must include the means and methods of application, products used, project-specific conditions being addressed, and standardized tests performed for each proposed system or variation.

Always read the complete cautionary information printed on product container prior to use. This product is not suitable for use on non-treated aluminum applications.

This product data sheet has been prepared in good faith on the basis of information available at the time of publication. It is intended to provide users with information about guidelines for the proper use and application of the covered ProSpec® brand product(s) under normal environmental and working conditions.

Additional disclaimer information may be found here.


Container weight: 50 lbs


MarMac Grout Diapers
Machinery Bases
Sole Plates
Rolling Mills
Anchor Bolts
Transfer Lines
Precast Columns
Crane Rails
Bridge Seats
+ More

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*All statements and technical information are based on tests and/or data which MarMac Manufacturing deems reliable, however, MarMac does not warrant or guarantee the accuracy or completeness of such information. Please read further manufacturer liability and warranty information.

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