Fig. 1
Portland Cement based
non-shrink grout from Dayton Superior
develops compressive strength
complying with ASTM C-109.
Once cured it will remain at
full strength indefinitely in exterior
or interior applications.
For interior applications that will not come under any heavy pressure or vibration most grouts will provide adequate long-term service. For exterior applications where weather conditions and temperature fluctuations will be present, or where additional compressive strength is required to resist pressure or vibration it is important to select a grout that is Portland Cement based.
The two essential properties Portland Cement grout will possess are:
Controlled Expansion. This is the term that describes the simultaneous action of shrinking and expanding. When grout is mixed with water and begins the curing process, it occupies a specific volume. As the water and drying agents are removed through evaporation the mixture shrinks. Additives are included in the mixture to offset the shrinkage plus a minor expansion to produce the pressure required for very rigid installations. The ideal expansion ratio is 0.10 to 0.12%, but cannot exceed 0.30% as this would create too much pressure and force cracking.
Fig. 2
Gypsum based grout.
Shown is a handrail post in an exterior setting. While there is a sound concrete setting, the gypsum grout shows shrinkage. Mild corrosion of the steel is visible at the tube base, and the depression will allow water to accumulate and accelerate the decay of the steel, grout and surrounding concrete.
Fig. 3
Portland Cement based grout.
Shown is an exterior setting where
the grout remains sound and shows
no sign of shrinking. A slight dome
in the grout will continue to deflect
water from the post and avoid any
accumulation.
Non-Shrink. Once it has fully cured, a process that takes 28 days, the grout will be at its maximum expansion. Even in exterior applications a Portland Cement based grout will maintain the size and fit indefinitely.
This is essential for two reasons.
- It assures a firm connection or fitting.
- Any shrinkage would leave a cavity for water to enter. This is damaging by itself but especially in colder temperatures where a freeze-thaw cycle would develop.
Beyond cementitious grouts there are many options for special application grouts that can be used in extreme conditions, limited access and high-pressure locations. We encourage you to contact us with any questions or needs involving grouts or any of the construction industry products offered.
Phone : 631-212-0705
Email : [email protected]