L. Michael10/30/02

“A YEAR WITH…”

Approved Gyratory CompactorsApproved Gyratory Compactors

Pine AFGC125X

Troxler 4140 Troxler 4141

Pine AFG1 Brovold

Interlaken

Rainhart

IPC ServoPac

Are they allthe same?

2001

Are they allthe same?

2002

NO!!!

Maryland SHAMaryland SHARound RobinRound Robin

SGC Set to 1.25 degrees Externally12.5mm Mixture / 6 Replicates

2.4902.5002.5102.5202.5302.5402.5502.5602.5702.5802.5902.600

0 5 10 15 20 25 30 35 40 45 50

Compactor ID

Indi

vidu

al B

ulk

Spe

cific

Gra

vitie

s,

Gm

b

Maryland SHAMaryland SHARound RobinRound Robin

0

2

4

6

8

10

12

His

togr

am

2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58

Average Bulk Specific Gravity, Gmb

SGC Set to 1.25 degrees Externally12.5mm Mixture / 6 Replicates

Maryland SHAMaryland SHARound RobinRound Robin

2.525

2.530

2.535

2.540

2.545

2.550

2.555

2.560

2.565

Ave

rage

Bul

k S

peci

fic G

ravi

ty,

Gm

b

B (2) IL (1) G1 (3) 125 (14) S-Pac(1)

4140(22)

4141 (2)

SGC Model (Number of Units)

SGC Set to 1.25 degrees Externally12.5mm Mixture / 6 Replicates

Maryland SHAMaryland SHARound RobinRound Robin

2.00

2.50

3.00

3.50

4.00

Air

Voi

ds, V

a

B (2) IL (1) G1 (3) 125 (14) S-Pac (1) 4140 (22) 4141 (2)

SGC Model (Number of Units)

SGC Set to 1.25 degrees Externally12.5mm Mixture / 6 Replicates

Maine DOTMaine DOT

Since going to internal angle set by DAVSince going to internal angle set by DAV

In 2002In 2002?? Out of over 2000 bulk splits (DOT/Contractor)Out of over 2000 bulk splits (DOT/Contractor)?? 1.5% dispute rate1.5% dispute rate?? 0.5% overturned0.5% overturned

Maryland SHAMaryland SHARound Robin Round Robin -- OriginalOriginal

0

2

4

6

8

10

12

His

togr

am

2.51 2.52 2.53 2.54 2.55 2.56 2.57 2.58

Average Bulk Specific Gravity, Gmb

SGC Set to 1.25 degrees Externally12.5mm Mixture / 6 Replicates

Maryland SHAMaryland SHARound Robin Round Robin -- DAVDAV

0

1

2

3

4

5

His

togr

am

2.38 2.39 2.40 2.41 2.42 2.43 2.44 2.45

Average Bulk Specific Gravity, Gmb

SGC Set to 1.16+0.02 degrees using DAV12.5mm Mixture / 6 Replicates

Gyratory CompactorGyratory Compactor?? Bearings Bearings -- excessive wearexcessive wear?? Brake Brake -- not functioning properly; not functioning properly;

does not maintain the same does not maintain the same starting pointstarting point

?? Ram head Ram head -- excessive wearexcessive wear?? Column Column -- lack of greaselack of grease?? Machine Machine -- not maintained; stops not maintained; stops

during compaction; worn parts during compaction; worn parts need replacedneed replaced

LESSONS LEARNED WITH DAVLESSONS LEARNED WITH DAV

LESSONS LEARNED WITH DAVLESSONS LEARNED WITH DAV

MoldsMolds?? Out of roundOut of round?? Excessive wearExcessive wear?? Lack of maintenanceLack of maintenance

MixMix?? Different mix sizes change internal angleDifferent mix sizes change internal angle

Some compactors do not compare; Some compactors do not compare; reason is unknown reason is unknown

LESSONS LEARNED WITH DAVLESSONS LEARNED WITH DAV

Refinement of AASHTO T 312Refinement of AASHTO T 312--0101

Additional IssuesAdditional Issues

Implementation Issues:Implementation Issues:?? Cost(s)Cost(s)?? MaintenanceMaintenance?? SpecificationsSpecifications

Mixture stiffness versus internal angleMixture stiffness versus internal angleMold WearMold WearRoundRound--robin (interrobin (inter--laboratory) studylaboratory) study

Now What ?

2003

Gyratory Compactor Gyratory Compactor ?? Must be serviced and Internal Angle setMust be serviced and Internal Angle set?? at 1.16at 1.16

Molds must be checked for:Molds must be checked for:?? Out of roundOut of round?? Excessive wearExcessive wear

2003 IN MARYLAND2003 IN MARYLAND

Questions...