DETERMINATION OF DEGREE OF COMPACTION OF BITUMINOUS PAVEMENTS -

STANDARD

OBJECTIVE

To determine the degree of pavement compaction of bituminous aggregate mixtures by coring with diamond bit core drill as related to standard specimens compacted of the same materials.

APPARATUS

Diamond bit core drill machine
Rigid plate or suitable container is larger enough to hold the sample without distortion after it is removed from the pavement.
Balance of capacity 10 kg’s and sensitivity 0.05 gms and of such a type and shape as to permit the basket containing the sample to be suspended from the beam and weighed in water.
A wire basket of not more than 6.3mm mesh or a perforated container of convenient size preferable chromium-plated and polished, with wire hangers thickness not less than 1mm.
A stout watertight container in which the basket may be freely suspended
Two dry.soft absorbent clothes each not less than 650 cm2

PROCEDURE

Preparation of Standard Specimens

Prepare standard specimens from the representative sample of mix to be tested for compaction in accordance with MS-4 1989.

Determination of Bulk Density

Determine the bulk density of the standard specimen in accordance with AASHTO Designation: T 166—78.

Core cutting

Use 100mm diameter core bit if the maximum nominal size of aggregate is 25mm or less and 150mm diameter core bit if the maximum nominal size of aggregate is over 25mm.
Core a sample from the pavement and remove it carefully without distorting, bending, cracking or in away changing its physical condition as it was before removal from the pavement.
Forward the sample to the laboratory where it is to be tested.
If there is any delay in forwarding the sample to the laboratory place the sample in a safe and cool place.
Submit complete identification information with the sample.
Record the dimensions of the core in the laboratory.

Determination of Bulk Density

Determine the bulk density of the core in accordance with AASHTO Designation: Tl 66-74.

Degree of Pavement Compaction

Determine the degree of pavement compaction by dividing the bulk density of pavement specimen by the

bulk density of the standard specimen.

CALCULATIONS

Bulk density of pavement specimen
Degree of compaction= ——————————————-x 100
Bulk density of the standard specimen

REPORT

Report all the values as the percentage of compaction to the nearest second decimal.

PRECAUTION

Remove the core carefully without distorting bending or in anyway changing its physical condition as it was before removal from the pavement.

DETERMINATION OF DEGREE OF COMPACTION OF BITUMINOUS PAVEMENTS
AASHTO Designation: T 230-68 (1974)

DETERMINATION OF DEGREE OF COMPACTION OF BITUMINOUS PAVEMENTS