US SPEC MP Grout

Versatile  : Plastic or fluid consistency.
Cost effective : Extendable.
Strength : Attains high compressive strengths at specified water ratios.
Thixotropic : High flow restored by agitation.
Non-Corrosive : Will not rust.
Security : Maximum, uniform bearing support.
Performance : Joins, supports and anchors. Hardens free of bleeding or segregation.
Consistent : Strict Quality Control testing and standards.

MP Grout is ideal for a wide variety of precision applications that include:

• Precision Grouting : Machinery bases, compressors, punch presses, generators.
• Structural Grouting : Steel columns, precast columns, crane rails, beams.
• Underwater Grouting : Form and pump applications.
• Anchoring : Guard rails, sign posts, dowels, rods, bolts.
• Pumping Applications : Excellent flowability.

Surface Preparation:

All surfaces in contact with MP Grout shall be free of dirt, oil, grease, laitance and other contaminants that may act as bondbreakers. All unsound concrete should be removed to ensure a good bond. Smooth, dense surfaces need to be mechanically abraded to provide necessary bonding requirements. Mechanically prepare the substrate to a minimum CSP 5 following ICRI Guideline 310.2R to allow proper bonding. ACI recommends that the area to be grouted should be saturated for 24 hours before placement. Remove any standing water. Substrate should be saturated, surface dry (SSD). Maintain contact areas between 40°F (4°C) and 90°F (32°C) prior to grouting and during initial curing period.

Application Thickness:

1-3” Neat, up to 8” extended.

Coverage/Yield:

50 lbs (22.7 kg) will fill approximately 0.43 ft³ (0.012 m³) when 4.5 quarts mixing water is used.

Foaming:

Method of forming must provide for rapid, continuous grout placement. For pourable grout, construct forms to retain grout without leakage. Forms should be coated with a US SPEC form release for easy removal.

Mixing:

For larger batches, use a mortar mixer with rotating blades. For smaller batches, use a heavy duty 1/2” (15 mm) (or larger) low-speed, corded drill and mixing paddle #6 per ICRI Technical Guideline 320.5. Pre-wet mixer and empty excess water. Place 3/4 of the required cool, clean potable water in mixer, then add dry material. Mix on low RPM for a total of 3 to 5 minutes, adding the remaining water, until a homogeneous mixture is achieved. When using a mortar mixer higher RPMs may be necessary to achieve a homogeneous mixture. Mix only enough grout that can be placed within working time. For plastic consistency, use 3.0 quarts of water. For flowable consistency, use 4.0 quarts of water. For fluid consistency, use 4.5 quarts of water. These mix ratios provide a guideline. The actual water demand will depend on type of mixer used, water temperature and ambient temperature. Adjust the water to achieve the desired flow. Recommended flow is 20 to 30 seconds using the ASTM C939 Flow Cone Method. For placements greater than 3” depth, MP Grout must be extended 30% by weight of powder, with clean, washed and dried 3/8” (1 cm) pea gravel. Do not blend excess water as this will cause bleeding and segregation. Do not use any other admixtures or additives.

Placing:

Grout should be placed using established procedures according to American Concrete Institute recommendations. MP Grout can be placed by pumping, pouring, rodding or strapping. Mechanical vibration may cause segregation of aggregates. Place grout on one side of area. Let grout flow to opposite and adjacent sides to avoid entrapment of air and uneven bearing of the grouted surface. When necessary, provide vent holes. Grout should continue to be placed until it protrudes from the entire perimeter area. Grout “head” and excess grout may be removed after initial set. Recommended minimum placement depth is one inch.

Finishing & Curing:

Follow standard ACI curing practices. Do not disturb formwork or grout for 24 hours. Use wet rags or burlap to cure for 6 hours after placement. After 6 hours, remove rags from exposed surfaces and cure with a membrane forming curing compound such as US SPEC Maxcure Resin Clear, US SPEC Hydrasheen or US SPEC CS-25-1315. For best results, exposed grout should extend downward at a 45° angle from edge of base.