Non-shrink grout is a hydraulic cement grout that produces a big volume that, when hardened under stipulated test conditions, is greater than or equal to the original installed volume; often used as a transfer medium between load-bearing members.
- Often sets rapidly
- Usually a pre-mix product that needs only to be mixed with [water]
- Includes ingredients to compensate against cement stone shrinkage
- Use of shrinkage-compensating ingredients can result in volume increase over time
Performance Requirements: Usually NS grout complying with the following requirements:
- ASTM C1107, Grades B and C.
- Corps of Engineers CRD C621, Grades B and C, at fluid consistency over 30-minute working time at temperature range of 40 to 90 degrees F (4 to 32 degrees C).
- ANSI/NSF 61, for use with potable water
Compressive Strength, Plastic Consistency, ASTM C942 according to ASTM C1107:
- 1 Day: 4,500 psi (31 MPa).
- 3 Days: 6,000 psi (41 MPa).
- 7 Days: 7,500 psi (52 MPa).
- 28 Days: 9,000 psi (62 MPa).
Volume Change, Fluid Consistency, ASTM C1090:
- 1 Day: Greater than 0 percent.
- 3 Days: 0.04 percent.
- 14 Days: 0.05 percent.
- 28 Days: 0.06 percent.
Setting Time, Plastic Consistency, ASTM C191:
- Initial Set: 2 hours 30 minutes.
- Final Set: 4 hours.
Flexural Strength, Fluid Consistency, ASTM C78:
- 3 Days: 1,000 psi (6.9 MPa).
- 7 Days: 1,050 psi (7.2 MPa).
- 28 Days: 1,150 psi (7.9 MPa).
Modulus of Elasticity, Fluid Consistency, ASTM C469, Modified:
- 3 Days: 2.82 x 106 psi (1.94 x 104 MPa).
- 7 Days: 3.02 x 106 psi (2.08 x 104 MPa).
- 28 Days: 3.24 x 106 psi (2.23 x 104 MPa).
Coefficient of Thermal Expansion, Fluid Consistency, ASTM C531:
- 6.5 x 10-6 in/in/degree F (11.7 x 10-6 mm/mm/degree C).
Splitting Tensile Strength, Fluid Consistency, ASTM C496:
- 3 Days: 575 psi (4.0 MPa).
- 7 Days: 630 psi (4.3 MPa).
- 28 Days: 675 psi (4.7 MPa).
Tensile Strength, Fluid Consistency, ASTM C190:
- 3 Days: 490 psi (3.4 MPa).
- 7 Days: 500 psi (3.4 MPa).
- 28 Days: 500 psi (3.4 MPa).
Resistance to Rapid Freezing and Thawing, ASTM C666, Procedure A, 300 cycles RDF:
VOC Content: 0 lbs per gal (0 g/L), less water and exempt solvents.
Prepare surfaces in accordance with manufacturer’s instructions.
Clean steel surfaces of dirt, oil, grease, and other contaminants.
Ensure surface to be grouted is clean, saturated-surface dry, sound, and roughened to CSP of 5 to 9 in accordance with (International Concrete Repair Institute) ICRI Guideline 03732 to permit proper bond.
Chip concrete surfaces to roughness of plus or minus 3/8 inch (10 mm) when dynamic, shear, or tensile forces are anticipated. Verify absence of bruising in accordance with ICRI Guideline 03732.
Saturate concrete surfaces with clean water for 24 hours immediately before grouting.
Remove freestanding water from foundations and bolt holes immediately before grouting.
Grout and sufficiently set anchor bolt holes before major portion of grout is placed.
Shade foundation from sunlight 24 hours before and 24 hours after grouting.
If saturation is not possible use bonding epoxy on the substrate prior to grouting.
Erect forms in accordance with manufacturer’s instructions.
Erect forms liquid tight and nonabsorbent. Seal forms with putty, sealant, caulk, or polyurethane foam.
Use head form sloped at 45 degrees to enhance grout placement, if necessary.
Erect side and end forms minimum of 1 inch (25 mm) horizontally from object grouted to permit expulsion of air and remaining saturation water as grout is placed.
Leave minimum of 2 inches (51 mm) between bearing plate and form to allow for ease of placement.
Use sufficient bracing to prevent grout from leaking or moving.
Eliminate large, nonsupport grout areas wherever possible.
Extend forms minimum of 1 inch (25 mm) higher than bottom of equipment being grouted.
Consult grout manufacturer for recommendations regarding expansion joints.
Mix materials in accordance with manufacturer’s instructions.
Store and mix grout to produce desired mixed-grout temperature. If bagged material is hot, mix with cold water. If bagged material is cold, mix with warm water. Achieve mixed-product temperature as close to 70 degrees F (21 degrees C) as possible.
Adjust water to achieve desired flow. Recommended flow is 25 to 30 seconds using ASTM C939 Flow-Cone Method. Use minimum amount of water required to achieve necessary placement consistency.
Mix grout a minimum of 5 minutes after material and water is in mixer. Use mechanical mixers.
Do not mix more grout than can be placed in approximately 30 minutes.
Do not re-temper grout by adding water and remixing after it stiffens.
Place grout in accordance with manufacturer’s instructions.
Ensure foundation, plate, and grout temperatures do not fall below 40 degrees F (7 degrees C) until after final set, when grouting at minimum temperatures.
Place grout from only 1 side of equipment to prevent air or water entrapment beneath equipment. Place grout in continuous pour.
Discard grout that becomes unworkable.
Ensure grout fills entire space being grouted and remains in contact with plate throughout grouting process.
Do not vibrate grout to facilitate placement. Use steel straps inserted under plate to help move grout.
Immediately after placement, trim surfaces with trowel and cover exposed grout with clean wet rags. Do not use burlap. Keep rags moist until grout surface is ready for finishing or until final set.
Wait until grout offers stiff resistance to penetration with pointed mason’s trowel before grout forms are removed or excessive grout is cut back.
Consult grout manufacturer before placing lifts more than 6 inches (152 mm) in depth.
Cure grout in accordance with manufacturer’s instructions.
Cure exposed grout with membrane curing compound approved by grout manufacturer and compliant with ASTM C309 or preferably ASTM C1315.
Apply curing compound immediately after wet rags are removed to minimize potential moisture loss.
Protect grout from temperatures at and below 32 degrees F (0 degrees C) until grout has attained compressive strength of 3,000 psi (21 MPa).
Protect completed grout from damage during construction