ERICO LENTON INTERLOK Rebar Splicing System - Manual (Page 20)

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2.3 Hot and Cold Weather Grouting Instructions
The HY10L filler material is designed to be used with the LENTON ® INTERLOK rebar splicing system. Unauthorized use of
other grouts will void all warranties, whether expressed or implied.
The recommended temperature range for the HY10L filler material is 50 to 80°F (10 and 27°C). At no time during placing
and curing should the temperature of the LENTON INTERLOK coupler, rebar, and HY10L be allowed to be outside the range
of 40 to 90°F (4 and 32°C),
!!CAUTION!! DO NOT ADD ANY admixtures or additives to the HY10L, as this will affect the properties and void all warranties.
3. Hot Weather Grouting:
As with other grouts, in hot weather 90 to 100°F (32 to 38°C) the HY10L may lose workability rapidly, causing flash setting
and loss of compressive strength. In hot weather precautions must be taken to guard against the HY10L from setting too
quickly. To overcome these problems, modify the basic procedures as follows:
1. Store the bags of HY10L in a cool, shaded (preferably indoor) location until the time of use.
2. Use chilled mixing water as close to 33°F (0.6°C) as possible. This can be easily accomplished by placing a block of
ice in a 55 gallon (200L) drum of water. At the time of placement, the freshly mixed grout should be 80°F (27°C)
or below. At no time during placing or curing should the grout temperature be greater than 90°F (32°C).
!!CAUTION!! No pieces of ice must be allowed to be mixed in with the grout as this will result in voids that will
affect the connection performance.
3. Keep the areas and panels to be grouted covered with a damp tarp or burlap. Place other tarps above and around
the panels so that the area is kept shaded for at least several hours prior to grouting.
4. Locate the mixer in a shaded area as close to the grouting site as possible. Prior to mixing, cool the mixing bucket
and mixer with chilled water. Drain all excess water thoroughly from the mixer and mixing bucket.
5. Immediately after grouting, cover the areas and panels that were grouted with a damp tarp or burlap for at least
12 hours. Place additional tarps above and around the panels so as to shade the areas that were grouted from the
direct sunlight. Do not soak or spray water directly on or around the areas that were grouted so as to create puddles
of water. DO NOT ADD additional water to retemper the HY10L.
!!CAUTION!! Mix only one bag at a time. In hot weather the working time of the HY10L will be significantly reduced, there-
fore, it will be necessary to work quickly with the grout. Premature stiffening and difficulty in pumping and workability may
result in hot weather applications. If the grout becomes too stiff to pump or pour, discard the remaining material and mix a
fresh bag.
For additional information on Hot Weather Grouting, refer to the IBC 2009 and ACI 318, 305R and 301.
4. Cold Weather Grouting:
As with other grouts, in cold weather the HY10L will tend to set up more slowly, therefore, the first 24 to 72 hours are critical.
When grouting in cold weather, modify the basic procedures as follows:
1. Store the bags of HY10L in a warm building at above 50°F (10°C) for 48 to 72 hours prior to grouting.
2. The LENTON INTERLOK coupler, the rebar, the panel, and the areas to be grouted should be heated (for example,
with space heaters) until the panels have reached a uniform temperature of above 50°F (10°C) through the thickness
(usually about 12-24 hours).
!!CAUTION!! When using space heaters be sure to observe all manufacturer’s safety guidelines.
!!CAUTION!! Grout should never be placed into frozen concrete or LENTON INTERLOK couplers.
To effectively heat the area, construct a protective enclosure out of wood or canvas. Insulate this enclosure and the areas to
be grouted with sheets of plastic, canvas, or other insulation to prevent heat loss. Follow common fire safety practices when
constructing and heating the working areas.
3. Make sure all couplers and inlet and outlet tubes are clear and free of ice or moisture.
4. Heat the mixing water to no more than 90°F (32°C).
!!CAUTION!! Mixed grout temperatures greater than 90°F (32°C) could cause flash set; mixing water temperatures lower
than 80°F (27°C) will have little effect on raising the grout temperatures.