106-AN grout pilot-scale test HGTP-93-0501-02 Page: 81 of 151
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the cooling air at the surface. After cooling for 1 week, the different lifts
can no longer be distinguished from the thermal profiles (Figure 6.21). The
warmest area (440 to 480C) is centered about 2 ft below the grout surface and
is slightly warmer than the first lift after a week of cooling.
The peak thermal profile in the third lift (Figure 6.22) shows that the
warmest area in the third lifts shifts down slightly and is a little below the
center of the third lift. The warmest area is again shifted slightly towards
the cooling air outlet side of the mold. After 1 week of cooling (Figure
6.23), the different lifts can no longer be distinguished from the thermal
profiles. The warmest area is centered about 2 ft below the surface and has
again increased in temperature (relative to the second lift) to 440 to 52CC.
The peak thermal profiles for the fourth lift (Figure 6.24) show the
warmest areas again shift down and are below the center of the lift. The
warmest area is not shifted toward the cooling air outlet side of the mold.
After 1 week of cooling (Figure 6.25), the thermal profiles show that all four
lifts are acting like a single monolith. The warmest area has shifted down
slightly relative to the third lift and is centered about 2.5 ft below the
surface. The warmest temperatures in the grout have risen to 520 to 560C.
Examining the general trends for all four lifts indicates that there is a
temperature buildup occurring as the successive lifts are added. The first
lift is effectively cooled during the first week because heat is lost through
the mold bottom. When the second lift is poured, some of the initial
hydration heat from the second lift goes into reheating the first lift. As a
result, the peak temperatures in the second lift are low. However, the grout
in the first lift also acts as insulation and reduces the amount of heat from
the second lift that is lost through the bottom of the mold. Therefore, once
the first lift is reheated, most of the heat that is lost from the second lift
is lost through the surface. Lower overall heat loss leads to warmer
temperatures in the grout when the third lift is poured. As a result, heat
loss into the warmer cured grout of the second lift is not as great when the
third lift is poured. This increases the maximum peak temperature of the
third lift and shifts the warmest area down below the lift center since the
proportion of heat lost through the surface is now greater. This pattern
continues for the fourth lift.6.13
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Bagaasen, L. M. 106-AN grout pilot-scale test HGTP-93-0501-02, report, May 1, 1993; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1319387/m1/81/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.