METHODST4 THE BALL PENETRATION TEST FOR SURFACE TREATMENT DESIGN 1 SCOPE This method describes a test tor measuring the penetration resistance of a road surface using a steel ball with a diameter of 19,0 mm. The result may be use<:1 when designing a surface treatment for a road. 2 APPARATUS (See also Figure ST 4/1.) 2.' A circular (127 mm) trIpod stand and cross-bar. 2.2 A steel ball with a diameter of 19,0 mm, 2 .3 A depth gauge graduated in mm, 2.4 A surface thermometer graduated in degrees Celsius {25 to 55 'c), 2.5 A standard Marshall compaction hamm er complying with TMH 1. AppendlX to Method C2 3 METHOD Subdivide he road into a number of representative sites, Toss the steel ball onto the road a1 each site in a random manner , Place the circular tripod stand over the ball at the paint where It comes to rest so that the ball is in the centre of lhe circular frame, Place the cross-bar in the slots provided on the 'stand so that the forward edge of the bar is vertically above the centre of the ba ll. Take an initial reading by means of a depth gauge from the top of the cross-bar to the top of the ball and remove the bar without disturbing the tripod stand. Give the ball one blow with the Marshall hammer and replace the cross-bar In the same position as before. Take a second reading as above. The depth of penetration is the difference between the two readings, Repeat the procedure at least 10 times at each site and report lhe mean depth of penetratton of the steel bal!. Take the temperature of the road surface at each si1e for each set of penetra- tion readings. 4 CALCULA nONS Correct the penetration reading by means of the following formula: Pen To := Pen Tl - K(TI - To) where Pen To :::;; penetration depth at suggested road surface temperature (mm) Pen T, - penetration depth at measured road surface temperature (mm) T 1 :::::: temperature of road at time of ball test (0C) SpecIal methods Draft TMH6. Pretoria. $Dutil Africa, 1984 15
THE BALL PENETRATION TEST FOR SURFACE TREATMENT DESIGN
1 SCOPE This method describes a test tor measuring the
penetration resistance of a road surface using a steel ball with a
diameter of 19,0 mm. The result may be use
16
]
To = temperature of road suggested for particular location (CC)
K :::; temperatura..susceptibility of penetration (mm'OC).
K-factors recommended:
0.04 mrnj"C 0,05 mm/PC 0.07 rnrn!OC 0,08 mmJ"C
Single and multip!e seals (not fatty) Slurry seals (not fatty) .
Cape seals (not fatty) Fatty roads and premix surfacings.
It should be noted that the re:ationsnlp is valid for all road
surfaces and tem -peratures (To) lying between 25 and 55 cG.
REFERENCE MARAIS. C p, Advances in the design ana application of
bifummous mateflals in road construction. PhD (Eng) theSIS.
University of Natal. Durban, South Af rica. 1979
Special methods Draft TMH6, Pretoria. South AfTica. 1984
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