The flow table test is an established method used to assess the workability of concrete, particularly useful for evaluating highly flowable concrete mixes. This test employs an apparatus that consists of a wooden board topped with a steel plate, collectively weighing 35 pounds. The board is connected to a base via a hinge and measures 27.6 inches on each side.
Concrete is placed within a truncated cone mold that is 8 inches high with an 8-inch base diameter and a 5-inch top diameter. The concrete is gently compacted, the excess is cleared away, and the mold is removed after 30 seconds.
The test procedure involves jolting the table 15 times at 4-second intervals by lifting the upper board to a height of 1.6 inches. This action causes the concrete to spread out from the initial cone shape. After the jolting, the extent of the spread of the concrete is measured parallel to the two edges of the table. The average spread is calculated to assess the concrete's workability. Specific values of spread are used to categorize the concrete's workability as either medium or high. This test provides crucial data on the concrete's ability to flow and settle under its own weight, reflecting its suitability for various construction applications where high fluidity and even distribution are necessary.
The flow table test, used to find the workability of concrete and evaluate highly flowable concrete, involves an apparatus consisting of a wooden board topped with a steel plate, with a total weight of 35 pounds.
A hinge connects the board to a base, with each side of the board measuring 27.6 inches.
The upper board is designed to be lifted to a height of 1.6 inches, and the table has specific markings that guide where the concrete should be placed.
A truncated cone 8 inches high, with an 8-inch base diameter and a 5-inch top diameter, is filled with concrete. It is gently compacted, excess concrete is cleared away, and the cone mold is carefully removed after 30 seconds.
The table is jolted 15 times, with each jolt given at an interval of 4 seconds, causing the concrete to spread.
The average of the extent of spread parallel to the two edges of the table, measured after jolting, indicates the concrete's workability, with specific values corresponding to medium or high workability.
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