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.
Test standards used to designate a grout as non-shrink include, but are not limited to:
- C1090-01(2005)e1 Standard Test Method for Measuring Changes in Height of Cylindrical Specimens of Hydraulic-Cement Grout
- 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.
Typical cementitious materials caveats
Despite the use of expanding or shrinkage-compensating ingredients, users are ordinarily cautioned to avoid environments detrimental to the forming of cement stone. These include but are not limited to the following:
- Avoid high wind across the curing surface.
- Avoid high temperatures during the cure.
- Avoid common cement poisons, such as sulphates, acids, etc.
Failure to follow these precautions can adversely affect the quality of all cementitious products.