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Concrete Manual Tests: Concrete Age-Strength Relationship Mobile App

Concrete strength varies with age. Under continuous favorable conditions, concrete continues to gain strength indefinitely. Samples of concrete taken from old pavements and tested in compression indicate higher strengths after 25 years than when the pavement was 1 to 3 years old. Tests for concrete strength are made shortly after it has been placed (7 to 90 days). It is always tested for acceptance at fairly early ages with respect to the concrete life and for this reason the strength obtained is less than the ultimate strength the concrete will attain. The Concrete Manual Tests: Concrete Age-Strength Relationship mobile app is is designed to assist with age strength testing.

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Take a peek inside the Concrete Manual Tests: Concrete Age-Strength Relationship Mobile App

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Included Fields

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    Concrete strength varies with age.

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    Flexural strength and compressive strength develop at different rates within the concrete.

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    Strength tests are required for one or both of the following purposes:

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    1. To check the potential strength of the concrete under controlled conditions against the desire...

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    To establish a strength-age relationship for the concrete under job conditions as a control for ...

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    Tests made for the first purpose are referred to as standard tests and those for the second purpo...

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    For uniform and comparable results, follow a standard and consistent procedure

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    Twenty-four hours after casting, place the cylinders in water at a temperature of 15 to 25°C (60 ...

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    You do not need to remove plastic molds when curing cylinders in water however, remove the caps d...

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    Transport the cylinder, in a capped plastic mold to prevent moisture loss, to the laboratory for ...

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    Completely fill out the Concrete Cylinder ID card (Form 2409) so that the cylinder is positively ...

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    Number cylinders made on each contract in consecutive order, beginning with number 1.

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    Show the cylinder numbers on both the identification card and on the Weekly Concrete Report (Form...

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    Cylinders that have the suffix “C” after the numbers are considered control cylinders and are cur...

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    The standard cylinders are tested at 28 days, unless for special reasons, tests at different ages...

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    Some of the factors that can result in failures are listed below.

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    Improper molding of the specimens may result in honeycombed sections in specimens.

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    Towards the end of each construction season, cylinders that broke below 80% of anticipated stren...

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    Inadequate curing of the cylinders may result in low strengths.

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    Rough handling of cylinders, particularly during early ages, will cause fractures or planes of w...

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    A decrease in the cement content of the mix by either withholding part of the cement per batch o...

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    The use of dirty or contaminated aggregates results in a lower bond strength between the cement ...

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    Increasing the water content of the mix for easier workability without increasing the cement con...

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    Decreasing mix time, either intentional or otherwise, may leave portions of both sand and gravel...

  • ...and More!

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