Division 3 - Concrete
     Section 03310 -Concrete
          1.04 Quality Assurance

image 1: Slump test of concrete.

Each load of concrete delivered to the site is field tested by an independent testing laboratory hired by the Owner. The slump method for consistency of mix is shown here in progress (image 1). The concrete mix is controlled by the specification and batched by the concrete plant. A manifest of each truck load is also collected and logged in by the independent testing laboratory. Test cylinders are taken of each load of transit-mix delivered. The concrete test cylinders are cured on site as well as in the testing laboratory and tested for compressive strength at 3,7,14, and 28 days. The slump test shown requires a hollow metal cone and solid rod. The platform for the test must be non absorptive and dead level. Concrete is placed in the cone with the larger diameter down (8" diameter standard). Concrete is "rodded" per standard testing procedure, leveled off, and the cone is then removed quickly producing a positive shape, which slumps because of gravity. The slump is measured against the original form height to the specified slump (usually 4"). The original shape of the concrete is 8" in diameter to 4" in diameter for a 12" height. Should the test fail the specified amount of slump, the concrete truck would be refused at the site by the testing laboratory. The slump shown here is 4" exactly.

Division 3
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