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IntelliRock III Concrete Maturity Loggers

Next-Generation Concrete Temperature & Strength Profiling Solutions  

Intellirock KitIntellirock III is the simplest, latest tool to record and report concrete temperature and strength with 3G wireless connection to a dedicated intellirock3 Web App. 

The concrete maturity method is a proven early age strength estimation technique (ASTM C 1074) that accounts for the effects of time and temperature on the strength development of in-place concrete.

  • Accelerates construction & reduces form work costs by allowing early stripping & stressing
  • Eliminate the need for expensive curing after form work removal
  • Ensure concrete quality by monitoring differential temperatures, including live email alerts of risk. 
  • Reduce the disruptive curing time on flat work by proving concrete has reached a self cure state (defined by strength)
  • improves safety by giving a simple means of accurately gauging strength of critical elements before support removal (eg tilt up, suspended slabs). 


intellirock3 Web AppEngius developed the IntelliRock Concrete Maturity logger in 2002. It won the 2003 World of Concrete award for innovation and has seen rapid growth and adoption on many major US projects in a short time. The reason? It is a simple and extremely cost effective device. 

The third generation of IntelliRock delivers on the promise of full wireless integration, a 3G radio box uploads up to 8 logger outputs to the dedicated intellirock3 Web App, ready for review from the site office, on a mobile device anywhere with an internet connection.

Critical alerts are also available, for gained strength, Max or Differential temperature limits. Data is ready for charting or export from the Web App and is updated every few minutes. 

Maturity monitoring gives insitu strength, updated live in the IntelliRock III web app, that strength can be used to determine if the structure is “cooked” from either a load or durability perspective.

The key difference is that for load the strength of the bulk concrete is required and for durability the strength of the cover zone is required.

Generating The Strength/Maturity Calibration Curve

Maturity Curve, Cylinders, Compressive Strength Test, IntelliRock

When the compressive strength will be achieved within 7 days develop the relationship curve at roughly 50%, 75%, 100%, 150%, 200% and 400% of the maturity value corresponding to the anticipated required strength. At greater than 7 days use points at 25%, 50%, 75%, 100%, 150% and 200%. Finally, a graph of maturity versus strength is generated (this can be done using the spreadsheet that comes with the IntelliRock maturity reader). The strength-maturity relationship is generated in the laboratory by first preparing cylindrical specimens made from the same mix-design that will be used in the field. Two specimens are instrumented, e.g. by IntelliRock maturity loggers (figure 1), to record the time-temperature history and calculate the maturity while sets of 3 cylinders are crushed for strength. 



Measuring Maturity and Strength in The Field

IntelliRock, Embedded, Reader

The time-temperature history of the concrete insitu is now recorded and integrated over time. Using intelliRock maturity loggers this is extremely simple as the temperature gauge, temperature/time logger and the maturity integration are all undertaken in a 35mm long x 30mm diameter cell that is embedded in the concrete. A wire is taken to the surface where the maturity reader can be plugged in at any time to download all data or to simply read off the maturity and hence strength.

Applications Involve

  • Development of Strength : Concrete maturity strength curve relationships
  • Measuring Maturity of Insitu Concrete

Advantages over Concrete Thermocouples 

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

  • Automatic concrete maturity and strength calculation, information is available onsite with no processing, site staff can read maturity of concrete and make a decision using only the handheld reader, or live in the Web App. 
    There is no need to load data into excel or to send an engineer to site. 
  • Durability, third generation loggers 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, or radio and even a damaged cable can be re-terminated easily
  • No Programming, loggers are ready to run out of the box pre,set with a logging period and duration 
  • 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


  • Temperature accuracy +/-1°C
  • Nurse Saul or Arrhenius calculation
  • Operating temperature -20°C to 99°C
  • Data logging at 1 minute with a maturity integration period of 1 minute. 
  • Logs for 180 days


T: (03) 9938 3830

Stuart McCurdy

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M: 0428 315 502

Monica Simhadri

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M: 0488 331 244


William Ward

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T: (02) 9453 9999

M: 0418 381 709


Jun Han Lee

T: +64 9 377 6778

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M: +64 274 738 758


Michael Dubery

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(Head Office)

T: (08) 9322 4020

Reuben Barnes

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M: 0408 034 668

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