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Figure 5-10: Electrical permeability of High Carbon Fly Ash CLSM Mixture CLSM-A
Dried vs. Saturated Specimens
Measurements taken for saturated CLSM specimens produced significantly
smaller resistivity values compared to the air-dried specimens when tested
without carbon fibers (Mixture CLSM-A). For the dried specimens, the aging
process affected the resistivity significantly; the older the specimens, the
higher the resistivity. The aging process affected the dried specimens more
than the saturated ones. This indicates adding moisture to the material in place
improves its conductivity. For the mixture containing carbon fibers, Mixture
CLSM-B, air-dried specimens also had a higher electrical resistivity, but the
difference between saturated and air-dried specimens were much less.
Typically the difference between air-dried and saturated specimens was one
ohm-cm or less. This may be attributed to the conductivity of the carbon fibers
used in the mixtures.
Commonly-Used CLSM Mixtures
We Energies has been testing and utilizing controlled low-strength materials
containing fly ash for construction for over 15 years. Though several mixture
proportions have been tried, a few mixtures are commonly used that are reexcavatable
by ordinary methods. These mixtures usually are required to be
self-leveling and essentially free from shrinkage after hardening. The mixtures
that are most commonly used are designed to reach a state of hardening such
that they can support the weight of a person in less than 24 hours.
151 We Energies
Coal Combustion Products
Utilization Handbook