Specific gravity is defined as the ratio of weight of the aggregate to the weight of an equal volume of water at a specified temperature. Procedure Where, A = Weight in gm of the saturated aggregate in water (A1- A2) B = Weight in gm of the saturated surface dry aggregate in air C =…
The soundness test is a critical standard test performed on both fine and coarse aggregates to determine their resistance to disintegration when exposed to weathering action. This test, also called the sulfate soundness test, aims to simulate the effects of repeated wetting and drying as well as freezing and thawing cycles that aggregates undergo after…
Flakiness index is defined as the percentage by weight of the particles in it whose thickness is less than three- fifths (0.6 times) of their mean dimension. Flakiness index test Procedure Dimensions of thickness and length gauge FLAKINESS INDEX Elongation Index test Elongation index is defined as the percentage by weight of the particles in…
Procedure (Los Angeles Abrasion test) Specified Abrasive Charge Note The percentage of wear should not be more than 16% for concrete aggregates.
Procedure Aggregate Impact Value (AIV) = B/A x 100 Where B = weight of aggregate passing through 2.36 mm sieve A = weight of the oven – dried sample Note AIV should not be more than 45% for use in concrete other than wearing surfaces, and 30% for concrete used for wearing surfaces such as…
Procedure Aggregate crushing value (ACV) = B/A x 100 Where B = weight of aggregate passing through 2.36 mm sieve A = weight of the surface dry sample taken in mould Note ACV should not be more than 45% for use in concrete other than wearing surfaces, and 30% for concrete used for wearing surfaces…