106-AN grout pilot-scale test HGTP-93-0501-02 Page: 85 of 151
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A similar analysis was conducted on the grout temperatures obtained at
the center of the third lift. Figure 6.27 shows that the same general
patterns are obtained. The net reduction from the adiabatic curing
temperature due to surface cooling of the third lift after 2 weeks was also on
the order of 30CC. One notable difference is the widening of the calculated
lift temperature and adiabatic curves. This widening indicates that the
surface cooling is removing heat from the third lift. However, only four
pours were conducted and the center of the third lift was never more than 3 ft
from the surface. If the lift sequence had continued beyond the fourth lift,
there probably would have been little additional heat removal from this
portion of the grout.
Assuming that the net temperature reduction derived from cooling a 2-ft
lift for 1 week is on the order of 300C, and a conservative adiabatic
temperature rise of the grout is on the order of 700C, the total temperature
rise of grout in the vault will be on the order of 400C. If the grout is
poured at 400C, the final grout temperature predicted from the pilot-scale
information should be on the order of 800C. This indicates that the heat
removed with the airflow during a 1-week cooling period should prevent grout
temperatures from exceeding 90CC in the production vault.
This analysis of the long-term, lift mold temperatures indicates that the
amount of heat removed by convective/evaporative cooling from a 2-ft lift
during a 1-week cooling period should prevent grout temperatures from
exceeding 900C. However, this may not be the optimum schedule and modeling of
the full-scale vault is recommended to determine the best pour schedule. This
modeling should include 1) the actual lift scenario, which includes a 24-hour
pouring period, 2) heat release from the grout as a function of temperature
and extent of reaction, 3) a temperature-dependent heat-removal rate from the
surface, and 4) the slower heat removal mechanisms present in the vault.6.17
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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/m1/85/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.