MINISTRY OF TRANSPORT
INSTITUTE OF TRANSPORT SCIENCE AND TECHNOLOGYThe rutting situation on the asphalt
pavements of Vietnam
Assoc. Prof. Vu Duc ChinhMSc. Bui Ngoc HungTokyo, 30-31/10/2013

Contents
1. Assessment of the rutting on the asphalt
pavements of Vietnam
2. Study of rutting in Vietnam
3. Discussion of methodology and criteria forrutting test in laboratory for Vietnam
4. Discussion of type of hot mix asphalt andpavement structure for rutting resistance2

I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM• In recent years, rutting has occurred widely on some mainroads in Vietnam.
• Assessment of causes and solutions of rutting and proposalof rutting test are first step.

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I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

Some pictures of rutting in Vietnam
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I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

HIGHWAY N01 (HA NAM – THANH HOA SECTION)
Causes of rutting:Estimation of traffic volume, axle load for designing structure ofpavement is unsuitable. The actual traffic volume and axle loadgreater than forecast.
The actual thickness of pavement and base course lower than thedesign.
Management of construction quality is not good.

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I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

HIGHWAY N01 (HA NAM – THANH HOA SECTION)

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I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

THANH TRI BRIDGE PROJECT
Causes of rutting:The actual traffic volume and heavy axle load greater than forecast.
High air temperature in recent year.
Asphalt mixture for rutting resistance has not mentioned.

7I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

THANH TRI BRIDGE PROJECT

8I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

HIGHWAY N05
Causes of rutting:The actual traffic volume and heavy axle load greater than forecast.
Asphalt mixture for rutting resistance has not mentioned.

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I. ASSESSMENT OF THE RUTTING ON THE ASPHALTPAVEMENTS OF VIETNAM

HIGHWAY N05

10II. STUDY OF RUTTING IN VIETNAM

Research situation on rutting: Before 2009 almost no study on rutting.
 In 2009, ITST has implemented a project study about rutting.
 Since 2009, some testers of rutting have imported to Vietnam(only Hamburg Wheel-Tracking type).
 National standard TCVN 8819:2011 for conventional asphalt
concrete has issued, rutting has mentioned. But need to update.

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II. STUDY OF RUTTING IN VIETNAM
Rutting test for some kind of asphalt mixture have conducted inHamburg Wheel Tracking Device:No

Type of specimen

Rut depth at
10000 passes(mm)

Rut depth at
20000 passes(mm)

Marshallstability(KN)

Marshallflow (mm)

Note

1

BTNC15-1

From NH5 site

2

BTNC15-2

From NH5 site
From Lab

3

BTNC15-3

20.01-

10.20

2.95
From Lab

4

BTNC2518.97-

12.00

3.10

From Lab
5

BTNC12,5-1

17.63-

9.92

3.36

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II. STUDY OF RUTTING IN VIETNAM

No

Type of specimen

Rut depth at
10000 passes(mm)Rut depth at
20000 passes(mm)

Marshallstability (KN)

Marshall flow(mm)Note
From Lab

6

BTNC12,5-2

19.43

-

9.92

3.36

From Lab
7

BTNC12,5-3

16.66-

10.42

3.22

From Lab
8

BTNC12,5-4

19.69-10.42

3.22

9

BTNP 12.5

10.99-17.80

3.87

10BTNP 195.75

13.23

17.40

4.80

11SMA9.5

4.03

7.08

9.15

3.1212

SMA12.5

5.93

9.99

9.32

3.56

From Lab

From Lab

13II. STUDY OF RUTTING IN VIETNAM

Comment of rutting test : Marshall stability value of all samples is higher than requirement
 Maximum rut depth of conventional asphalt concrete is highest,
polime asphalt concrete is lower and SMA is lowest.

14III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM

1) Device of rutting test
 In the world there are many different types of devices forrutting test.
 In Vietnam, only small Hamburg Wheel Tracking type isavailable. Small Hamburg Wheel Tracking type is selected.

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III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM

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III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM
2) Standard Method of Test AASHTO T324-04: Standard Method of Test for Hamburg WheelTrack Testing of Compacted Hot Mix Asphalt (HMA):
 Laboratory specimens with 152mm diameter Core drill specimens with 250 mm diameter or slab specimens (32x26x5) cm.
 Test condition: In immersion.

 Europe standard EN 12697-22:
 Cylindrical specimens with 200mm (or 300mm) diameter or slab specimens (30x30x5) cm
 Test condition: In air or immersion

 Propose Europe standard EN 12697-22 for Vietnam or other?

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III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM
3) Condition and temperature of rutting testPropose temperature of rutting test for Vietnam:N0ContentsAirWater

1Temperature, 0C

6050

2

Type of test wheel

Rubber coated testwheel

Steel wheel test

What’s your opinion about condition and temperature of ruttingtest?

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III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM
4) Selection of rutting criteria
Standard of Germany: Rut Depth (RD) – mm
 Proportional Rut Depth (PRD) - % Wheel-Tracking Slope (WTS) - mm/103

EN 13108-1 Bituminous mixtures - Material specifications - Part 1, 2, 3:
 Maximum wheel tracking slope mm per 103 load cycle Maximum proportional rut depth (%)
 Maximum wheel tracking rate µm/cycle
 Maximum rut depth (mm)AASHTO T324-04:
 Maximum rut depth (mm) Stripping inflection point

Propose criteria of Maximumrut depth (mm) for Vietnam.

19III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM
5) Selection of specimen preparation method
Laboratory:
 Slab specimens: Standard EN 12697-33 (preparation by roller
compactor)
 Cylindrical specimens: Standard EN 12697-31 (preparation bygyratory compactor) or AASHTO T312

Site specimens: Cutting specimens as slab or cylinder
The specimen size : Slab: 260x320mm and 300x300mm
 Cylinder: 150mm diameter Cores from site: minimum 200mm diameter20

III. DISCUSSION OF METHODOLOGY AND CRITERIA FOR
RUTTING TEST IN LABORATORY FOR VIETNAM
6) The limited value of rut depth
Conventional asphalt concrete : In immersion: The load on the wheel is 700 N, test
temperature is 500C, wheel runs 10000 passes. Max rut depth=12.5mm
 In air: Not identified. What’s your opinion
Polime asphalt concrete: In immersion:- PMBI: The load on the wheel is 700 N, test temperature is 500C,wheel runs 15000 passes. Max rut depth =12.5mm;- Nhựa PMBII, PMBIII: The load on the wheel is 700 N, test
temperature is 500C, wheel runs 20000 passes. Max rut depth=12.5mm;

 In air: Not identified. What’s your opinion
What’s your opinion: What road class have to test rutting?
21IV. DISCUSSION OF TYPE OF HOT MIX ASPHALT AND
PAVEMENT STRUCTURE FOR RUTTING RESISTANCE
1) Type of hot mix asphalt:
 Standard TCVN 8819:2011 including 03 types of HMA (usingnormal bitument) used for asphalt pavement in Vietnam:

BTNC9.5 (NMAS=9,5 mm) for leveling
BTNC12.5 (NMAS=12,5 mm) for wearing course in normal
and BTNC19 (NMAS=19 mm) for binder course in normal

 What’s your opinion:
 In normal, BTNC12.5 (NMAS=12,5 mm) for wearing course.
Could use BTNC19 for wearing course ?
 Using polyme asphalt concrete to resist rutting on pavement, Whatconditions?.
 Using other material as SMA may be the effectiveness?
 What’s about Porous Asphalt?

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IV. DISCUSSION OF TYPE OF HOT MIX ASPHALT AND
PAVEMENT STRUCTURE FOR RUTTING RESISTANCE
2) Structure of pavement: In normal, structure of pavement in Vietnam is designed:
 Subgrade with density 95%-98%
 Base course: Granular crushed aggregate, thickness from 2045cm.
 02 asphalt concrete layers, thickness from 5-7cm (wearingcourse) and 7-8cm (binder course).
As structure of pavement above, some roads have occured
rutting soon.
 What’s your opinion:
Structure of pavement resist rutting in Vietnam?

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I would like to receive your opinion
from you.
Thank you for your attention!

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