Concrete slump test

The strong hang test is a definite test that measures workability of new concrete.

The test measures consistency of concrete in that specific group. It is performed to check consistency of freshly made bond. Consistency insinuates the straightforwardness with The test is pervasive as a result of the ease of mechanical gathering used and fundamental technique. Unfortunately, the ease of the test as often as possible allows a wide variability in the path in which the test is performed. The hang test is used to ensure consistency for different bundles of concrete under field conditions,[1]:127,128 and to take in the effects of plasticizers on their presentation. In India, this test is coordinated by specific.

Principle

The hang test measures the consequent behavior of a compacted adjusted cone of concrete under the movement of gravity. It indicates consistency or wetness of concrete

Apparatus

Metal mold, alive and well of the frustum of a cone, open at both terminations, and outfitted with the handle, beat internal estimation 4 in (102 mm), and base inside expansiveness 8 in (203 mm) with a stature of 1 ft (305 mm). A 2 ft (610 mm) long slug nosed metal shaft,
5/8 in (16 mm) in estimation

Procedure

The test is finished using a mold known as a hang cone or Abrams cone. The cone is put on a hard non-supple surface. This cone is stacked with fresh concrete in three stages. Inevitably, every layer is pressed 25 times with a bar of standard estimations. At the end of the third stage, bond is struck off flush to the most elevated purpose of the mold. The mold is carefully lifted vertically upwards with winding development, so as not to bother the strong cone.

Solid fades away. This subsidence is termed as hang, and is measured to the nearest 5 mm if the hang is <100 mm and measured to the nearest 10 mm if the hang is >100 mm


Collapse
In a breakdown hang the strong falls completely.

Shear

In a shear hang the top part of the strong shears off and slips sideways

True
In a certified hang the strong fundamentally fades away, keeping basically to shape

Limitations of slump Test

The hang test is suitable for hangs of medium to high workability, hang in the extent of 5 – 260 mm, the test fails to choose the qualification in workability in solidified mixes which have zero hang, or for wet mixes that give a breakdown hang. It is confined to concrete surrounded of sums of under 38 mm (1.5 inch)