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Concrete Paving Quality Control Procedures: Early Stiffening and False Set Mobile App

Some portland cements and combinations of cement and pozzolans may be prone to false set. False set reduces the workability of the concrete mixture. Workability can be restored by remixing without the addition of water. Since remixing is not normally possible when a central mix plant and dump trucks are used for delivery, the false set condition is usually offset by adding more mixing water, which increases the water-cementitious materials (w/cm) ratio. This is poor practice. Performing the penetration resistance test on the cementitious materials and admixtures during the mixture design stage will indicate whether the mixture is prone to false set due to material incompatibilities. The Concrete Paving Quality Control Procedures: Early Stiffening and False Set mobile app covers: Purpose, Principle, Test Procedure, Test Method, Output and Construction Issues. You can use reference data to designate app users for individual app users.

  • Lendlease
  • The Cooperative
  • PG&E
  • Red Bull
  • Mirvac

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Take a peek inside the Concrete Paving Quality Control Procedures: Early Stiffening and False Set Mobile App

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Included Fields

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    Some portland cements and combinations of cement and pozzolans may be prone to false set.

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    Since remixing is not normally possible when a central mix plant and dump trucks are used for del...

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    Performing the penetration resistance test on the cementitious materials and admixtures during th...

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    As concrete mortar stiffens (sets), the resistance required for a 10-mm diameter rod to penetrate...

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    ASTM C 359, the Standard Test Method for Early Stiffening of Portland Cement (Mortar Method) (fal...

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    Vicat: A frame holding the 10-mm rod and an indicator to measure the depth of penetration in mm.

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    Mortar mold: A box 51-mm wide x 51-mm high x 152- mm long (2- x 2- x 6-in.

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    Mixer: A laboratory mixer used for remixing the mortar sample.

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    Test Method – Refer to ASTM C 359 for Comprehensive Guidance

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    Mix a mortar sample using materials from the project

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    strike it off.

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    Using the Vicat, hold the 10-mm rod in contact with the top surface of the mortar by a set screw.

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    Release the rod from the set screw and allow it to penetrate into the mortar.

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    Take penetration readings 3 minutes, 5 minutes, 8 minutes, and 11 minutes after batching.

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    After the 11-minute reading, remix the mortar sample for 1 minute.

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    and strike it off.

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    Measure the penetration 45 seconds after completion of remixing.

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    repetitions.

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    The depths of penetration are reported in tabular and graphical format, as in this example

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    Initial penetration 50 mm

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    5-minute penetration 40 mm

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    8-minute penetration 25 mm

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    11-minute penetration 10 mm

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    Remix penetration 25 mm

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    If, as shown in the example, the penetration after remixing is greater than the 11-minute penetra...

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    Situations that may indicate the occurrence of false set include the following:

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    Excessive vibration that essentially remixes the concrete.

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    Loss of workability during moderate temperatures.

  • ...and More!

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