Terminology – concrete fit Sverige

Activation Energy	Represents the energy that a molecule in the initial state of the process must acquire before it can take part in a reaction.
Calibration Curve	Same as the “Maturity Curve”
Compressive strength	The strength recorded from compression tests
Concrete mix	Any mixture containing cementitious material and water
Curing time	The time from concrete placement until the current time
Datum temperature	Datum temperature is the temperature at which concrete stops its strength development
Early-age strength	The strength within the first few hours or days after casting concrete (normally up to 14 days)
Equivalent age	The maturity index computed from the measured temperature history of concrete in the Arrhenius function
Final strength	The required strength after 28 days
Hydration	The chemical reaction that leads to changes that take place when cement reacts with water
In-place strength	The estimated strength of the field concrete
Maturity	Concrete maturity indicates how far a concrete mixture is in its curing process and it represents the relationship between time, temperature and strength gain
Maturity curve	A curve presenting the strength-maturity relationship to be used for estimating the strength of the concrete mixture cured under other temperature conditions
Maturity function	A maturity function is a mathematical expression to account for the combined effects of time and temperature on the strength development of a cementitious mixture. The key feature of a maturity function is the representation of how temperature affects the rate of strength development
Maturity index	An indicator of maturity that is calculated from the temperature history of the cementitious mixture by using a maturity function
Maturity instrument	A device that records the concrete temperature as a function of time
Maturity method	A technique for estimating concrete strength based on the assumption that samples of a given concrete mixture attain equal strengths if they attain equal values of the maturity index
Maturity sensor	Sensor that is able to measure time-based temperature
Samples	Concrete cylinders or cubes normally used for testing purposes
Set time	The time at which a concrete surface can bear the weight of an individual with minimal deformation
Specimen	See: “Samples”
Strenght-Maturity relationship	The relationship between the compressive strength and maturity index that is obtained by testing samples and recording their temperature history
Target strength	The required strength before proceeding to the next project step
Temperature-time factor	The maturity index computed from the measured temperature history of concrete in the Nurse-Saul function
Test age	The time from concrete placement until the compression test