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loads in		kN	mass in		kg
		0			0
		0.			5
0.05 +	0.10	= 0.	3 +	10 =	15
0.15 +	0.10	= 0.	15 +	10 =	25
0.25 ♦	0.25	= 0.	25 +	25 =	50
0.50 +	0.25	= 0.	50 +	25 =	75
0.75 +	0.25	= 1.	75 +	25 =	100

DIMENSIONS IN mm

3.2.2    The applied load is measured with a dynamometer attached to the machinę.

3.2.3    When the penetration resistance is less than 1 kN and rotation is not reąuired, the engine must be stopped to prevent the vibrations from the engine affecting the measured penetration resistance. The ratę of rotation should be between 15 and 40 rpm and should not exceed 50 rpm. The recommended average ratę of rotation is 30 rpm. (See notę 2 para. 6.)

3.3 General considerations

3-3.1 The possible need to prebore through the upper soil layers shall be estimated in each case. (See notę 3 para. 6.)

3.3.2 The criteria to be used for the ter-mination of a WST test shall be stated for each investigation, e.g. exceed the minimum penetration resistance or reach a minimum depth. (See notę 4 para. 6.)

i

NEW POINT 9

35.0    ♦0.2 mm WORN POINT 9

32.0    ♦ 0.2 mm

Fig. 2 Recommended tolerances for the manufacture of weight penetrometer points.

4. RECORDING

4.1    Penetration resistance

4.1.1    When the penetration resistance is less than 1 kN the standard load reąuired to give a ratę of penetration of about

50 mm/sec shall be recorded against the depth (Fig. 3). It should be noted in the boring log and on drawings whether weights or a dynamometer have been used. (See notę 5 para. 6.)

4.1.2    When the penetration resistance ex-ceeds 1 kN, the number of half turns reąuired for every 0.2 m of penetration shall be recorded (Fig. 3).

4.1.3    When the penetrometer is driven by blows of a hammer or some of the weights, the depths penetrated during driving shall be recorded.

3.1.2    The load shall be adjusted to give a ratę of penetration of about 50 mm/sec.

This means that the rod must be partly un-loaded when a layer of stiff soil, such as a dried crust, has been penetrated.

3.1.3    If the penetration resistance exceeds 1 kN or the penetration ratę at 1 kN is less than 20 mm/sec the rod should be rotated.

The load 1 kN is maintained and the number

of half turns reąuired to give 0.2 m of penetration is measured. The rod must not be rotated when the penetration resistance is less than 1 kN.

4.2 General notes

4.2.1    Ali observations which may help in the interpretation of the test results shall be noted in the boring log, e.g. sounds and vibrations in the rods when the point pen-etrates cohesionless soils (stones, gravel and sand). Also interruptions etc. shall be recorded.

4.2.2    The type of rotating eąuipment and the ratę of rotation shall be noted in the boring log.

3.2 Mechanized weight sounding

3.2.1 Tests are carried out in a similar manner as for the manuał soundings. The rod is rotated mechanically in stiff soils.

5. PRESENTATION OF TEST RESULTS

5.1 The recommended form of presenting the results of weight soundings is shown in Fig.

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