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Moisture analyzers, moisture meters

James Instruments

M-Meter?

Article: 00088756

Concrete maturity meter

The M-Meter? Maturity System is a six-channel microprocessor based instrument that integrates time and temperature for monitoring freshly poured concrete, on-site. The maturity number is calculated and updated every six minutes, and together with the lapsed time and temperature readings, are stored each hour. This information can be transferred to hard copy by a field printer (optional M-M-3010) attached to the M-Meter?. Battery capacity allows for up to 20 days of continuous operation.

Theory

The maturity method is a technique for predicting strength based on the temperature history of the concrete. Strength increases as cement hydrates. The extent of the cement hydration depends on how long the concrete has cured and at what temperature. Maturity is a measure of how far the hydration has progressed.

There are two established maturity equations, and both equations conform to ASTM C-1074. The equation, developed by Arrhenius is used in the James M-3056 meter. The Arrhenius equation is more suitable when the temperature is outside the range given above and the maturity number is expressed as the equivalent age in hours referred to 20 C. The Arrhenius equation also recognizes that cement types vary with different energy activation levels. The mathematics of the Arrhenius equation is more complex but it gives more accurate strength predictions over a variety of cement types.

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