Apparatus
NOTE:
All apparatus described should conform to the general requirements of BS 812:
Part 100.
Balance,
of capacity not less than 3 kg, accurate to 0.5g and of such a type as to permit
the weighing of the vessel containing the aggregate and water.
Well ventilated oven, thermostatically controlled to maintain a temperature of 105 °C ± 5 °C+
Vessel, capable of holding 0.5kg to 1.0kg of material up to 10mm nominal size and capable of being filled with water to a constant volume with an accuracy of ± 0.5 ml. the following vessels are suitable
a) Glass vessel, referred to last as a pycnometer, of about 11 capacity, having a metal conical screw top with an approximately 6 mm diameter hole at its apex. The screw top shall be watertight when it is screwed on to the jar, and, if necessary, a rubber or fiber washer shall be inserted in the joint. If such a washer is used, a mark shall be made on the jar to correspond with a mark on the screw top so that the screw is tightened to the same position every time and volume contained by the jar is constant throughout the test. A suitable vessel can be made from a 1kg fruit preserving jar in which the glass lid normally used is replaced by a sheet metal cone as shown in Figure 1.
b) Wide-mouthed glass vessel, such as a gas jar, of 1.01 to 1.51 capacity, with a flat-ground lip and a plane-ground disc of plate glass to cover it, giving a watertight fit.
Hair-dryer, or other means of supplying a current of warm air.
Watertight tray, of area not less than 0.03 m2.
Airtight container, large enough to take the sample.
Container, of a size sufficient to contain the sample covered with water and to permit vigorous agitation without loss of any part of the sample or water.
75 µm BS test sieve (see 5.4 of BS 812: Section 103.1: 1985) and a nesting sieve to protect the 75 µm test sieve, e.g. a 1.18 mm sieve.
Well ventilated oven, thermostatically controlled to maintain a temperature of 105 °C ± 5 °C+
Vessel, capable of holding 0.5kg to 1.0kg of material up to 10mm nominal size and capable of being filled with water to a constant volume with an accuracy of ± 0.5 ml. the following vessels are suitable
a) Glass vessel, referred to last as a pycnometer, of about 11 capacity, having a metal conical screw top with an approximately 6 mm diameter hole at its apex. The screw top shall be watertight when it is screwed on to the jar, and, if necessary, a rubber or fiber washer shall be inserted in the joint. If such a washer is used, a mark shall be made on the jar to correspond with a mark on the screw top so that the screw is tightened to the same position every time and volume contained by the jar is constant throughout the test. A suitable vessel can be made from a 1kg fruit preserving jar in which the glass lid normally used is replaced by a sheet metal cone as shown in Figure 1.
b) Wide-mouthed glass vessel, such as a gas jar, of 1.01 to 1.51 capacity, with a flat-ground lip and a plane-ground disc of plate glass to cover it, giving a watertight fit.
Hair-dryer, or other means of supplying a current of warm air.
Watertight tray, of area not less than 0.03 m2.
Airtight container, large enough to take the sample.
Container, of a size sufficient to contain the sample covered with water and to permit vigorous agitation without loss of any part of the sample or water.
75 µm BS test sieve (see 5.4 of BS 812: Section 103.1: 1985) and a nesting sieve to protect the 75 µm test sieve, e.g. a 1.18 mm sieve.
Supply of water, free from any impurity that would significantly affect its density. If distilled or deionized water is not available in sufficient quantity, tap water which has been freshly boiled and cooled to room temperature may be used. This water shall be used throughout the test
