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The proportioning plant inspector must be certain that all materials have been properly inspected and approved before permitting their use.Cement is normally accompanied by appropriate certification as described in Section 1019 of the Standard Specifications.

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The proportioning plant inspector is responsible for inspecting control of materials and batching operations.

The inspector's duties will start at the time materials are being stockpiled and will continue until final records for the project are complete.

Concrete can have different properties depending upon the mixture that is used in creating it, which contains cement, chemical admixtures, and aggregates.

These ingredients are mixed with water to create concrete which is used as a primary construction material in buildings.

As long as bubbles still emerge as the concrete vibrator is withdrawn, more vibration is necessary.

Contractors sometimes urge workers to complete this time-consuming task "efficiently," meaning quickly, but the result can be a structural failure after the concrete has cured.

The inspector should become familiar with the contents of manufacturer's brochures on the proposed batching equipment to understand its operation.

The contractor will normally have this information.

The inspector must be provided information about source and type of aggregates intended for use, and mix proportions.

The inspector must be familiar with inspection procedures for determining moisture content, scale weights, and inspection of batching equipment, the performance of tests, and reports.

If contractor elects to use an optimized mix, the mix design shall be submitted with the target gradation and allowable gradation range.

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