Bituminous mixtures (NGA8.3)

Table NGA8.1 provides guidance for compaction procedures that may be capable of achieving the specified air voids values.

Table NGA8.1 Compaction requirements for bituminous mixtures
Compaction plant and weight category	Bituminous mixtures
	Minimum passes/lift for compacted lift thickness up to
	40 mm	60 mm	80 mm	100 mm
Vibrotamper 50 kg minimum	5#	7#	NR	NR
Vibrating roller Single drum
600-1000 kg/m	10	12	NR	NR
1000-2000 kg/m	6	10	NR	NR
2000-3500 kg/m	5	7	8	NR
Over 3500 kg/m	4	6	7	NR
Vibrating roller Twin drum
600-1000 kg/m	5	7	NR	NR
1000-2000 kg/m	4	5	6	8
Over 2000 kg/m	3	4	4	6
Vibrating plate
1400-1800 kg/m²	6	NR	NR	NR
Over 1800 kg/m²	3	6	6	8
All above plant	For Maximum and Minimum compacted lift thickness Table A2.5
Alternative compaction plant for restricted areas
Vibrotamper 25 kg minimum	Minimum of 6 compaction passes Maximum of 75 mm compacted lift thickness
Percussive rammer 10 kg minimum
Notes: NR = Not Recommended # = Vibrotamper not recommended on permanent surface course of trenches > 500 mm Twin drum vibrating rollers are preferred for compaction of bituminous mixtures Single drum vibrating rollers are vibrating rollers providing vibration on only one drum Twin drum vibrating rollers are vibrating rollers providing vibration on two separate drums Mechanical pole tampers should be considered for compaction around iron work.