106-AN grout pilot-scale test HGTP-93-0501-02 Page: 71 of 151
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Assuming the specific heat of the solids in the grout is 0.2 cal/goC, the
mass-weighted, average specific heat of the grout (solids and water) is 0.527
cal/goC. Using this value as the specific heat and a grout density of 12.72
lb/gal, the calculated heat release from the grout after 7 weeks is 5100
Btu/cubic ft. The total amount of heat generated in this formulation over the
first 7 weeks is significantly less than the heat generated from the grout
formulation used in the previous DSSF pilot-scale test (Lokken 1992). The
measured adiabatic temperature rise shows that this grout formulation will
require pouring in lifts and forced convective/evaporative cooling to maintain
temperatures below 90CC. However, the total amount of heat that will have to
be removed to control the grout temperatures is less than that required for
the previous DSSF formulation.
6.3 CONVECTIVE/EVAPORATIVE COOLING
The current philosophy for dealing with the grout hydration heat is to
pour the grout in lifts and use increased airflows in the grout vault to
increase the rate of heat removal. Current plans call for installation of
equipment that will provide 3600 CFM of airflow.
The main goals of the lift mold were to measure how much heat the planned
convective/evaporative cooling could remove from the grout surface, and
measure the effects of this cooling on the temperatures in the grout.
However, it is also important to know how changes in the airflow might affect
the heat removed from the grout. Therefore, two sets of heat removal tests
were conducted with the lift mold. The first set of tests studied the heat
removal for different airflows and liquid surface conditions. In this case,
the surface of the grout was simulated by a liquid layer placed in the bottom
of the lift mold. These tests are referred to as the convective/evaporative
cooling tests.
For the convective/evaporative cooling tests, a target airflow rate of 13
standard cubic feet per minute (scfm) was determined by maintaining the
airflow/cooling surface area ratio the same for the lift mold as is planned
for the production vault. In other words, a 13 scfm airflow in the pilot-
scale tests will supply the same volumetric airflow per unit area of cooling
surface as a 3600 scfm airflow in the production system. Higher (24 and 366.3
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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/m1/71/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.