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Concrete Temperature Monitoring

intelliRockWeb300IntelliRock III Temperature Loggers can monitor and document the temperature profiles and gradients of in-place concrete. A dedicated reader with Thermal Camera is used to activate the loggers, and a wireless internet enabled connection can upload all results to the Cloud. 

The Cloud web app not only records data, but can graph differential temperatures and send warning alerts for over temperature or over gradient as required. 


The ability to determine true, in-place concrete temperature in real-time can greatly enhance one’s ability to manage critical path workflow:

  • Cold weather - Determine & document temperature profiles and regulate thermal protection.
  • Large Element Pours / Mass Pours – Thick pours generally require the maximum temperature and the surface to bulk difference to be monitored due to self insulation.
  • Cylinder Curing - Measure and document concrete cylinder curing conditions including tanks and moist rooms

Advantages over Concrete Thermocouples

IntelliRock temperature loggers are more durable and simpler to operate than a thermocouple based system, benefits include:

  • Durability, third generation logger encase all electronics in a durable plastic casing and have a strong cable selected to hold up to the rigours of concrete pouring and vibration
  • No Data Loss, each logger is self contained, with its own thermistor, battery, circuity and memory. There is no permanent connection to the reader and even a damaged cable can be re-terminated easily
  • No Programming, loggers are ready to run out of the box, once started recording data every minutes for 180 days. Data is then stored until the internal battery is depleted, typically 6 months or longer. 
  • Simple Installation, rather than working with finicky and expensive thermocouple wire and calibrating each sensor Intelirock loggers only need to be tied into place within the reinforcing cage and the cable led to a point outside the form work
  • Data Security, data is protected within the temperature logger, it cannot be altered 

Temperature Profile, IntelliRock Loggers, Temperature DiffernetialWhy Monitor Temperature?

Thermal cracks: Temperature rise (especially significant in mass concrete) results from the heat of hydration of cementitious materials. As the interior concrete increases in temperature and expands, the surface concrete may be cooling and contracting. This causes tensile stresses that may result in thermal cracks at the surface if the temperature differential between the surface and centre is 20–30 degrees depending on mix. The width and depth of cracks depends upon the temperature differential, physical properties of the concrete, and the reinforcing steel.

Strength: Concretes mixed, placed, and cured at elevated temperatures normally develop higher early strengths than concrete produced and cured at lower temperatures, but strengths are generally lower at 28 days.

Delayed Ettringite Formation (DEF): Maximum temperatures must be monitored to ensure that the formation of DEF is not assisted which occurs where temperatures are high. This can lead to cracking and durability issues with the resulting structure.  Most specifications have maximum temperatures for this reason.

Standard Temperature Loggers

Graph of multiple temperature history resultsThe IntelliRock probes contain a thermistor, a battery, and a microprocessor. They are a consumable sensor and data-logger in one.  During installation the probe is tied to reinforcing, the wires are lead to the top of the pour and then the probes turned on using the reader. The Reader is plugged into the probe exactly like a speaker wire.  Once the probe is running the Reader is unplugged and the probe works independently.

The loggers are programmed to log for 180 days recording a value each minute. The wires can be from 1.3m to 50m. The reader is capable of downloading up to 999 loggers for viewing on the reader or in the cloud server. The data files are highly portable and very secure. 

Intellirock Cloud Web App

Remote Box and operatorThe web app allows operators to review temperature information from onsite via any web browser, that could be a mobile phone, tablet or site PC with an internet connection. It allows live alerts for any critical criteria such as concrete approaching or exceeding maximum temperatures or maximum temperature differentials.

Remote Box

The remote box provides a secure link between the self contained loggers and the Intellirock Cloud Server. It is battery powered, has a mobile internet modem and can connect up to 6 loggers. Data is only transmitted by the remote box, there is no requirement for it to use data logging functions, and the cloud server can also be updated with data downloaded to the Intellirock Reader. It is critical for live updates to temperature histories and alerts. 




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