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A platform for research: civil engineering, architecture and urbanism
Chemically Bonded Ceramic Materials for Use in Thermal Energy Storage Devices
Calcium aluminate cement and sodium polyphosphate bonded refractory concretes, i.e., ''castables'', based on North Carolina olivine aggregates were developed for use in electric ''off peak'' or ''night'' storage heaters. The calcium aluminate cement bonded concretes exhibited no deterioration after 50 thermal cycles in a 15 kW room size storage heater. These cement bonded castables are limited to use below 1200 deg C when using the ''high iron (oxide)'' cements. The phosphate bonded concretes exhibited limited thermal shock damage after 50 thermal cycles, but this damage might be acceptable in storage core zones where temperatures exceed 1200 deg C due to the high refractoriness of the phosphate bonded compositions. Additions of high specific gravity minerals such as magnetite increased the bulk density of the concrete to equal that of conventionally fired (sintered) olivine brick. The performance of the storage heater with castable core components was similar to the heater's performance with a core constructed of conventionally fired brick. Concrete sections were cast directly about the heater's resistive elements without any deterioration of the concrete or effect on the heater's performance. These results demonstrate that simple concrete casting and curing steps can be employed to produce storage heater cores and that significant cost savings can be realized by using olivine concretes in storage devices as compared to the use of conventionally fired brick. (ERA citation 10:048836)
Chemically Bonded Ceramic Materials for Use in Thermal Energy Storage Devices
Calcium aluminate cement and sodium polyphosphate bonded refractory concretes, i.e., ''castables'', based on North Carolina olivine aggregates were developed for use in electric ''off peak'' or ''night'' storage heaters. The calcium aluminate cement bonded concretes exhibited no deterioration after 50 thermal cycles in a 15 kW room size storage heater. These cement bonded castables are limited to use below 1200 deg C when using the ''high iron (oxide)'' cements. The phosphate bonded concretes exhibited limited thermal shock damage after 50 thermal cycles, but this damage might be acceptable in storage core zones where temperatures exceed 1200 deg C due to the high refractoriness of the phosphate bonded compositions. Additions of high specific gravity minerals such as magnetite increased the bulk density of the concrete to equal that of conventionally fired (sintered) olivine brick. The performance of the storage heater with castable core components was similar to the heater's performance with a core constructed of conventionally fired brick. Concrete sections were cast directly about the heater's resistive elements without any deterioration of the concrete or effect on the heater's performance. These results demonstrate that simple concrete casting and curing steps can be employed to produce storage heater cores and that significant cost savings can be realized by using olivine concretes in storage devices as compared to the use of conventionally fired brick. (ERA citation 10:048836)
Chemically Bonded Ceramic Materials for Use in Thermal Energy Storage Devices
D. A. Brosnan (author)
1985
74 pages
Report
No indication
English
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