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conductivity tests were conducted using the thermal needle test method
(Mitchell and Kao, 1978). Electrical resistivity test values are used to predict
corrosiveness of soils. The electrical resistivity values obtained from the tests
indicate that CLSM fly ash slurry is not considered corrosive. Table 5-9
shows commonly used soil corrosivity vs. resistivity values.
Table 5-9: Electrical Resistivity vs. Soil Corrosivity
Resistivity (ohm-cm)
Below 500
Corrosivity
Very Corrosive
1,000 - 2, 000 Moderately Corrosive
2,000 - 10,000 Mildly Corrosive
Above 10,000
Progressively Less Corrosive
Thermal conductivity results exhibited a near linear relationship with moisture
content. Thermal conductivity increases with an increase in moisture content
and dry density. In applications like backfill for underground power cables
where high thermal conductivity is desired, high-density, low porosity
mixtures are preferable. Thermal conductivity values of high-volume flowable
fly ash slurry are typically lower
than sand, silt and clays but
higher than peat.
A study conducted by Dr. Henry
E. Haxo, Jr. of Matrecon, Inc.,
Alameda, California, concluded
that high-density polyethylenecoated
steel gas pipe, mediumdensity
polyethylene gas pipe
and low-density polyethylene
jacketed cable would not be
adversely affected by CLSM fly
ash slurry (39).
Figure 5-9: Excavating hardened CLSM with a
backhoe at We Energies’ Valley Power Plant in
downtown Milwaukee, Wisconsin.
Tables 5-10 and 5-11 show the electrical resistivity test results and thermal
conductivity test results respectively.
141 We Energies
Coal Combustion Products
Utilization Handbook