Every mass concrete project requires the contractor to monitor concrete temperature during the heat dissipation phase. Many specifications will require the development of a thermal control plan, or will specify how and where to measure temperatures. Contractors use COMMAND Center to track the internal temperatures of their in-place concrete during curing.
Each project may specify a unique set of locations at which the concrete temperature must be measured. In general, construction teams must monitor temperatures at the center of an element—where it is the hottest—and where it is the coolest: on outer faces, corners, and top and bottom surfaces. A traditional thermometer or infra-red laser is not sophisticated enough to adequately measure concrete temperatures in mass placements, so contractors use COMMAND Center sensors to reach these areas and reliably track their temperature. Contractors place the sensors in designated locations, pour the concrete, and let the sensors automatically measure and log temperatures at predetermined intervals. The contractor can check the temperature history at any time.
Sensors should measure concrete temperature during the time specified by the thermal control plan or specifications. Initially, after placement, mass concrete temperature readings may be acquired as frequently as hourly. After the concrete begins to cool and/or the temperature differential remains within the specified range for several consecutive days, temperature readings can be acquired less frequently.
COMMAND Center sensors record and store temperature data internally. Modern sensor technology offers users the ability to define the desired time intervals for recording temperature data. Once the sensor records data, construction teams can download the data and use the COMMAND Center software to generate reports of temperature history and temperature differential data for easy disbursement.
Some mass concrete placement projects require installation of a redundant set of sensors at locations near the primary set. Data from these redundant sensors is usually only acquired and recorded in the event the primary temperature sensors fail. Should any of the primary temperature monitoring equipment fail, the contractor must take immediate steps to fix it. If the primary system cannot be fixed, the backup temperature monitoring system must be put into service. Because of the extremely low failure rates of COMMAND Center sensors, redundancy is usually only necessary when required by specification.
Construction teams use COMMAND Center to properly monitor the temperature of mass placements during the heat dissipation phase. Failure to monitor mass placement temperatures can result in the mass concrete element being rejected. Rejected concrete elements usually must be removed at the contractor’s expense.
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