Core Fill 1

Core Fill Grout

In reinforced masonry, the SPEC MIX® Core Fill Grout is used to fill cells of concrete masonry units and horizontal bond beams as well as the cavities of composite masonry construction. Depending on the project specification, SPEC MIX Core Fill Grout is available in both Fine and Coarse mixtures. The Core Fill Grouts are a dry, preblended product containing cementitious materials and dried aggregates formulated for superior flow to fill masonry voids and optimal compressive strength while meeting ASTM C 476 and CSA A179 requirements for reinforced masonry construction. It is designed as a fluid, cohesive cementitious material used to bond together adjacent masonry units and steel reinforcement in the cores of the masonry units to the masonry assemblage, or to fill reinforced bond beams. Using SPEC MIX Core Fill Grout in conjunction with existing reinforcement will produce a structurally sound final wall system for reinforced masonry construction.

SPEC MIX Core Fill Grout is produced under strict manufacturing standards, and complete quality control measures are implemented with each batch. A digital printout displaying the proper proportions per batch may be kept as a permanent record. Each SPEC MIX® manufacturer certifies that SPEC MIX masonry products are designed to meet the project specifications and applicable ASTM, TMS, and CSA standards.

SPEC MIX® Core Fill Masonry Grout is available in 80 lb. (36.3 kg.) packages for easy hand loading or in 3000 lb. (1360.8 kg.) reusable bulk bags to be used with the various SPEC MIX silo systems.

  • Fills cells of concrete masonry units and horizontal bond beams as well as the cavities of composite masonry construction
  • Available in both Fine and Course designs to meet various project specifications
  • Meets ASTM C 476 and CSA A179 requirements for reinforced masonry construction
  • Designed as a fluid, cohesive, cementitious material used to bond together adjacent masonry units and steel reinforcement to the masonry assemblage, or to fill reinforced bond beams.

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Product Guide

Core Fill Masonry Grout Installation/Application

SPEC MIX® Core Fill Grout may be used in both low-lift and high-lift applications. Special consideration should be used in selecting the type of grout used for a particular application. Core Fill Grout may be placed by hand or by mechanical delivery. It should be consolidated upon placement and reconsolidated before initial set. Always check project specifications and structural notes to assure proper product selection has been made.

SPEC MIX Core Fill Grouts must be kept dry, covered and protected from weather and other damage.


Sizes and Equipment

SPEC MIX Core Fill Grout is available in 80 lb (36.2 kg) packages for easy hand loading as well as in 3,000 lb (1,360.7 kg) reusable bulk bags to be used with the various SPEC MIX silo systems. When using the silo system, once the bulk bags of grout are delivered to the project site, the portable silo is loaded with a jobsite forklift and the product is dispensed into a mechanical batch mixer. (See silo operations manual.)


SPEC MIX Core Fill Grout Mixing Instructions

WEAR IMPERVIOUS GLOVES, such as nitrile.
1. Use a mechanical batch mixer to ensure optimal workability and performance. Hand mixing grout should be permitted only with written approval by the specifier who should outline hand-mixing procedures.
2. Add the dry Core Fill Grout material to enough clean, potable water to obtain a flowable 8 in to 11 in (200 mm to 275 mm) slump complying with ASTM C 476 and local building codes.
3. When using a continuous mixing system, follow the mixer manufacturer’s recommendations. An 8 in to 11 in (200 mm to 275 mm) slump must be achieved.
4. Mixing times should remain consistent batch to batch.
5. In general, mix only the amount of material that can be used within one hour of initial mixing.

Estimated Yields Per 3,000 lb (1,360.7 kg) BULK BAG
Unit Size Blocks Filled Cores Filled
6 in (150 mm) Block 125 to 142 255 to 285
8 in (200 mm) Block 93 to 110 185 to 218
10 in (250 mm) Block 78 to 85 155 to 170
12 in (300 mm) Block 63 to 70 128 to 140
Note: The yields given above are approximate and depend on labor practices, site conditions and design of work. Yields include typical waste. Please contact our local representative for more specific yield information in your area.