Andrew operation and maintenance Specifications download pdf (Page 43)

Chapter 2 - Installation

42S315F 2-31

Consider the use of windbreaks and sunshades to maintain

saturation.

3. Cool the base plates while saturating the foundation by covering the

plates with wet cloths and allowing evaporation to cool them.

2.4.8.2 Cold Weather Grouting

Temperatures below 55°F (13°C) slow the hardening process and keep the

grout in a flowable state long enough to permit settlement and bleeding.

Although grouting may be successfully accomplished at ambient

temperatures as low as 45°F (7°C), the rate of strength gain (hardening) is

slow and the required time on-site may be excessive. To minimize the curing

time that must be allowed before finally torquing the anchor bolt nuts, it is

recommended that the grout, mixing water, and mount base plates be

warmed to accelerate the curing process. The following procedure is

suggested:

1. Store bags of grout in a sheltered place so that the material will be at least

above freezing, but preferably above 45°F (7°C).

2. Measure the temperature of the base plate and foundation by placing a

thermometer on the surface and covering it with a piece of dry insulation

or dry rags. If the temperature is above 55°F (13°C) minimum, proceed

with grouting following the grouting procedures. If the temperature is

below 55°F (13°C), warm the base plate and foundation to bring the

temperature above the minimum, using the following methods:

a) Base plates may be warmed by use of infrared heat lamps or by

building a small enclosure around the base plate and introducing heat

from a convenient source. Warm the mixing water as necessary to

provide mixed grout at a temperature of 60°F (16°C) or above, but

avoid use of water hotter than 90°F (32°C).

b) After installing grout, maintain the temperature of the in-place grout

at 50°F (10°C) or above for a minimum of three hours to ensure

adequate grout hardness for final tightening of the anchor bolt nuts.

NOTE

Grout will not harden unless the temperature is

maintained above freezing. The minimum temperature is

40°F (4°C).

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Andrew operation and maintenance Specifications Page 43