Journal of Highway and Transportation Research and Development Vol. 4,No. 2(2009)77

Research on Anti-rutting Performance of High Modulus Asphalt Concrete Pavement*

OUYANG Wei (gfcffiffi)1* * ,FAN Xinghua (^£^^)2,WANG Lianguang( Ei^P V

(I .School of Resource and Civil Engineering,Northeast University,Shenyang Liaoning 110004.China;

2.Liaoning Provincial Research Institute of Communications and Sciences.Shenyang Liaoning II00L2,China)

Abstract: A new way of antrrutting was put forward by improving modulus of asphalt concrete and the effect of high modulus asphalt con-

crete (HMAT) on rutting was studied in view of mechanics. Starting from the mechanism of rutting, the mechanical property of HMAT and

the effect of modulus of middle layer on rutting were analyzed. The dynamic stability and modulus of HMAC were analyzed by test, and the

mechanical property of pavement structure and the mechanical response of high modulus pavement structure were analyzed by numerical

calculation.The result show that (1) increase of the dynamic stability and modulus of HMAC help to against rutting; (2) the maximum

shear stress occurs in middle layer of pavement structure according to mechanical calculation, HMAC can raise elastic modulus of middle

layer. HMAC can also improve stress state of pavement structure, reduce shear strain and asphalt pavement rutting.

Key words:road engineering; high modulus asphalt concrete;rutting text;modulus in middle layer,shear strain

0 Introduction

High modulus asphalt concrete (HMAC) is a well -

known solution for roads and presenting better results in

terms of rutting and fatigue cracking resistance than conven-

tional mixtures .The use of HMAC could decrease thick-

ness of asphalt layers within the framework of rational road

design. High performance asphalt mixture was obtained by

test and it was used in the middle layer and can improve the

life of pavements, innovative materials was used to produce

asphalt concrete layers that could withstand distress phenom-

modified with asphalt were used. Conventional bitumen was

also used as a comparison mixture.

1.2 Experimental result The best mixtures aggregation was obtained by opti-

mized aggregation design. Marshall Compactor was used to

produce cylindrical samples.The characteristics of the de-

signed HMAC mixture are shown in Tab. 1.

Tab. 1 Dynamic stability and modulus of high

modulus asphalt concrete

Material Blend strain C/ie)

ena [2]

60 X

DS 15 X \ 10 Hz 45 X \ 10 Hz 55 X \ 10 Hz

457

1 High modulus asphalt concrete mixtures

1.1 Materials Experimental asphalt was produced by harmonic process

with Huanxiling asphalt No.90 as soft component, deoiled

stiff asphalt and modified asphalt were adopted as harmonic

components. The performance of the specimen is superior to

that of the low grade asphalt. Its sharp grade is PG76 - 22[3-5]_

Mix proportion was based on the current design specifi-

cations. Basalt aggregate, sand, hydrated lime and bitumen

AH-90 asphalt 1 284 10 082 1 311

4% SBS modified

asphalt 3 171 12 336 1 411

High modulus asphalt 4 950 14 285 2 356 1 309

It is verified that the DS and dynamic modulus of as-

phalt mixture with high modulus asphalt improved remark-

ably.

2 Mechanical analysis of structure with high modulus

asphalt concrete

2.1 Pavement parameter and calculating model

Pavement structure finite model was built to analysis

the effect of various moduli on the mechanical status of pave-

Manuscript received November 6,2007

* Supported by the Road and Transport R&D Project for Western Regions of China Commissioned by the MOC (No.200531877306)

E-mail address :ouyangwei3721 @ 163. com

J. Highway Transp. Res. Dev. (English Ed.) 2010.4:77-79.

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78 Journal of Highway and Transportation Research and Development

ment.Simi-rigid pavement structure of Liaoning province ex-

pressway was selected as the basic combination. The of mid-

dle layer material were divided into 5 cases with different

moduli at normal temperature, while the conditions of middle

layer material were divided into 4 cases with different moduli

at high temperature. The result is shown in Tab .2 .

Tab. 2 Structural combination of the asphalt concrete pavement

15 X. Combination of 45 X. Combination of

Structural asphalt concrete( MPa) asphalt concrete( MPa) Poisson's

layer Case Case Case Case Case Case Case Case Case rati0

12 3 4 5 12 3 4

Upper 2 000

Middle 1 800 2 200 2 500 3 000 3 500 550

Lower 1400

Base 1 500

Subbase 1 500

Cushion 180

Earth 40

350 0.35

) 850 1 000 0.35

800 0.35

500 0.20

I 500 0.20

180 0.35

40 0.40

2.2 Calculation results and analysis

Parameters of load and structure were input to infinite

model and calculation was carried out at point B on interior

edge of loading surface and point C at the center of loading

surface. The results of stress and strain is drawn in Fig. 1 to

Fig. 4.

160 -

140

S l20 " o. H, 100 -

■R 80

5! 60

CQ

40

20 -

0

-20 -I

2 000-1 800-1 400 MPa 2 000-2 200-1 400 MPa 2 000-2 500-1 400 MPa 2 000-3 000-1 400 MPa 2 000-3 500-1 400 MPa 350-550-800 MPa 350-700-800 MPa 350-850-800 MPa 350-1000-800 MPa

-i—r-

-100 0 100 200 300 400 500 600 700 800

SSWiM(mm)

Fig. 1 Tendency of shear stress with

various moduli

2.3 Analysis of calculation results It is shown in Fig. 1 that shear stress occurs inside

pavement of asphalt mixture under imposed traffic load, and

the larger stress occurs within 4 ~ 10 cm scale under the

pavement upper course.The more the modulus of asphalt

mixture is, the less the stress is. It is shown in Fig. 3 that

compressive stress in asphalt pavement increases with the

depth increases and when the depth is more than 30 cm the

stress is flat. It is shown in Fig. 4 that the compressive strain

in the asphalt pavement varies with the depth.

800

700

600-

|[ 500

#< 400 m B 300-

Jn= 200- oq

100

0

2 000-1 800-1 400 MPa 2 000-2 200-1 400 MPa 2 000-2 500-1 400 MPa 2 000-3 000-1 400 MPa 2 000-3 500-1 400 MPa 350-550-800 MPa 350-700-800 MPa 350-850-800 MPa 350-1 000-800 MPa

-100 -1—,— —,—r- -100 0 100 200 300 400 500 600 700 800

ti&mmiS. (m)

Fig. 2 Tendency of shear strain with

various moduli

0-

-100-

-200

£ -300

-400- m -500-

-600-

-700-

■ 1 800 MPa ■2 200 MPa -2 500 MPa - 3 000 MPa - 3 500 MPa

-i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i—i

-100 0 100 200 300 400 500 600 700 800 (mm)

Fig. 3 Tendency of compressive stress with

various moduli

0

-50-

-100-

-150-

^ -200-

-250-

-300

2 200 MPa 2 500 MPa 3 000 MPa 3 500 MPa

T—| 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 100 200 300 400 500 600 700 800

JSWiiffi (mm)

Fig. 4 Tendency of compressive strain with

various moduli

3 Analysis of rutting resistance of high modulus as- phalt mixture

3.1 Rutting mechanism There are two causes of rutting: one is that the larger

shear stress between layers under traffic load, which result in

larger shear deformation in the asphalt mixtures in high tem-

perature season. The second one is that there is displacement

J. Highway Transp. Res. Dev. (English Ed.) 2010.4:77-79.

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OUYANG Wei, et al: Research on Anti-rutting Performance of High Modulus Asphalt Concrete Pavement 79

for compressive stress.

3.2 Rutting resistance of high modulus asphalt mixture

It is shown that the rutting in the asphalt pavement is

related with the shear strain, longitude displacement and ca-

pacity of resistance to the deformation. The curves of dis-

placement and modulus are shown in Fig. 5.

800

600

400

200

0

- High temperature - Normal temperature

_i_ _i_ _i

0 1 000 2 000 3 000 4 000

Modulus(MPa)

Fig. 5 Tendency of shear strain

It is shown in Fig. 5 that the shear strain and longitude

strain reduce with the rise of modulus in the middle layer in

pavement. This trend is obvious at high temperature. It is

proved that the higher the modulus, the stronger the capacity

is.

The reason is that the quantity of shear strain and com-

pressive strain reduce obviously with rise of modulus in the

middle layer, the rutting depends on the accumulation of dis-

placement . The ratio of stress to modulus is shown in Fig. 6.

50 r ^ 40 - b. 30 -

- Shear stress/modulus -Compressive stress/modulus

4 000 1 000 2 000 3 000 Modulus(MPa)

Fig. 6 Tendency of ratio of stress to modulus

It is shown in Fig. 6 that the ratio of stress to modulus

reduces with the rise of modulus obviously. It is proved that

the stress is so minored than the modulus that its rise is ne-

glected. Therefore high modulus asphalt mixture could resis-

tant the effect of stress and its capacity of rutting resistance

is improved.

4 Conclusion

The application study of HMAC in the middle layer of

pavement shows that the application of HMAC material could

reduce the shear displacement and longitude displacement

effectively and rise capacity of rutting resistance in the as-

phalt pavement. It can improve the quality of asphalt pave-

ment , prolong the life of pavement and decrease the cost of

pavement maintenance.

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