Assessing Compressive Strength

There is a clear connection between the binding power and the compressive strength. DIN has a standard curve from which the compressive strength can be read as a resultofthefigure-of-eighttests (see Figure8.5).

Equipment for determining the strength of earth using the 'figure-of-eight' technique. (a) Construction of the figure-of-eight mould (DIN 18952). The diameters from the largest to the smallest circle are: 78 mm, 52 mm, 26 mm, 10 mm. The distance between the two smallest circles is 22.5 mm. (b) The mould in which the earth is rammed to a thickness of 22.3 mm. (c) The compressed piece of earth is placed between two steel grips with D = 140 mm, and sand is poured into a container hanging on the lower part of the sample.

Equipment for determining the strength of earth using the 'figure-of-eight' technique. (a) Construction of the figure-of-eight mould (DIN 18952). The diameters from the largest to the smallest circle are: 78 mm, 52 mm, 26 mm, 10 mm. The distance between the two smallest circles is 22.5 mm. (b) The mould in which the earth is rammed to a thickness of 22.3 mm. (c) The compressed piece of earth is placed between two steel grips with D = 140 mm, and sand is poured into a container hanging on the lower part of the sample.

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