Page 70 - HIGHWAY ENGINEERING LABORATORY_FLIP BUILDER

REFERENCE
WORK PROCESS DOCUMENT

8. Place the molds on a pedestal and compact on both top and

bottom surfaces Of 55 blows, which is designed for maximum tire
pressure 0.75 MN/m2

9. Remove the collar; leave the specimen for a while as the second
mixture is prepared and take out the specimen using an extrusion
jack. Let the specimen cool before testing it.

B. To test the specimen
1. Weigh and record the specimen’s weight in the air. Then weigh

the specimen again byputtingit in waterand record itsweight.
Calculatetheunitweight ofthespecimen Heat thespecimenin
thewaterisotherms(water bath)at 60± 1°Cfor30-40 minutes
Clean the surface of the head tester.Put the specimen in the
middle of the head. Fix the head on the correct position of the

tester.
2. Place the head tester equipped with a specimen on the
pedestal of the Marshall testing machine

3. Switch on and record the maximum force and maximum power
flow

C. Aggregate Mixing Specimen

Materials Percent (%)
20 mm aggregate 8
14 mm aggregate 14
10 mm aggregate 20
Quarry Dust/Sand 55
Cement 3

Bitumen content used : 4.0 %, 4.5%, 5.0%, 5.5, 6.0% and 6.5%

Higway Engineering Laboratory page 57