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Volumetric Truckmixer

Ready-mixed concrete can be prepared either by: mixing the constituents in a fixed plant, or by feeding the constituents into a rotating barrel mounted upon a vehicle chassis, the truck mixer.

Owing to the problems of proportioning materials of variable moisture content by weight, ready-mix is commonly mixed by volume.

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Volumetric truckmixer

Vertical-shaft Impactor

A secondary or tertiary crusher consisting of a rotor or impeller disc mounted on a vertical shaft which is rotated at high speed. Rock is fed on to the centre of the rotor from where it is thrown with high radial velocity to be broken on contact with either the anvils or previously crushed rocks which line the crushing chamber.

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Vulcanization

The treatment of rubber with sulphur compounds in order to change its physical properties; a process used in the manufacture and repair of tyres, conveyor belting etc.

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Vug

A natural cavity within a mass of rock usually lined with crystallized mineral.

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Voltmeter

An instrument for measuring the voltage or potential difference between two points in a circuit. It is connected across the points being measured.

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