ASTM C403 Concrete Setting Time Calculator

Enter penetration test readings to calculate penetration resistance, plot resistance versus elapsed time, and estimate initial and final setting times.

Elapsed Time
(min)		 Applied Force
(lbf)		 Needle Area
(in²)		 Penetration Resistance
(psi)		 Action
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Initial Setting Time

ASTM C403 threshold: 500 psi / 3.5 MPa
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Final Setting Time

ASTM C403 threshold: 4000 psi / 27.6 MPa
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Technical note: Penetration resistance is calculated as force divided by the bearing area of the penetration needle. The setting times shown by this tool are estimated by interpolation between the entered data points. For formal ASTM C403 testing and reporting, specimen preparation, penetration procedure, test intervals, plotting and regression requirements should be followed as specified in the applicable standard.