ERICO LENTON INTERLOK Rebar Splicing System - Manual (Page 21)

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2.3 Hot and Cold Weather Grouting Instructions
5. The HY10L grout at time of placement should be a minimum of 50°F (10°C) and no higher than 80°F (27°C).
!!CAUTION!! The LENTON ® INTERLOK coupler, rebar, and the HY10L filler material MUST be maintained at a temperature
between 40°F and 90°F (4 to 32°C) (preferably 50 and 80°F; 10 to 27°C), and the grout MUST be protected from freezing
(32°F or 0°C) during curing. Heat should be maintained until the HY10L inside the LENTON INTERLOK couplers has reached
a minimum compressive strength of 3000 psi (21 MPa). To reach this strength at 40°F (4°C) it may take 2 or more days and
should be verified with cube tests. Attainment of this strength must be determined by job site cube testing. HY10L that
freezes before reaching this compressive strength will be damaged and can suffer significant strength loss. Refer to ASTM
C-109 and C-942 or contact ERICO.
For additional information on Cold Weather Grouting, refer to the IBC 2009 and ACI 318, 306R and 301.
!!CAUTION!! Temperatures below 50°F (10°C) increase the time it takes freshly placed grout to develop strength. Therefore,
there is a risk of damage or collapse if the structure is loaded before it develops adequate strength. This strength requirement
must be determined by the structural engineer and should be based upon the expected construction loading.
It is a structural engineering decision when to remove bracing - the structural engineer should be consulted
before any bracing is removed regardless of the temperature.
Test Specimens:
Additional test specimens should be made and cured at the job site to assist in determining when bracing can be removed
and when the structure can be placed in service. Unless specimens used for these purposes are cured at the same place and
as nearly as possible under the same conditions as the LENTON INTERLOK connections, the test results can be misleading.
Working Time at Temperature:
NOTE: Refer to Figure 1 for approximate working time as a function of ambient temperature.
To determine the approximate working time of the mixed HY10L grout at the temperature of interest, follow these instructions.
1. On Figure 1 locate the temperature of interest in degrees Fahrenheit on the “X-AXIS”.
2. Using this as a reference, locate vertically the temperature on the line drawn on the graph.
3. Once the point has been located on the graph, then read across horizontally to obtain the Approximate Working
Time on the “Y-AXIS” in minutes at that given temperature.
4. Repeat this procedure for additional temperatures as needed.
FIGURE 1: ERICO brand of HY10L FILLER - Approximate Working Time vs. Temperature
NOTE: This information is provided for reference only. Actual working times will vary. Contact ERICO when further information is required.
APPROX. WORKING TIME (MINS)
50 F (10 C) 70 F (21 C) 90 F (32 C)
TEMPERATURE DEGREES F (C)
100
90
80
70
60
50
40
30
20
10
0