Wheel track rutting of asphalt concrete in New Brunswick

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Date
1989
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University of New Brunswick
Abstract
In New Brunswick, the occurance of wheel track rutting in asphalt concrete is becoming increasingly c o m m o n . S o c o m m o n , t h a t t h e N e w B r u n s w i c k D e p a r t m e n t o f T r a n s p o r t a t i o n h a s b e g u n t o i n v e s t i g a t e t h e e >••: t e n t o f rutting and possible causes.. This paper utilizes some of the data which has been collected bv N. B.DoT», to ^_ / • further investigate rutting due to plastic deformation of the asphalt layers. Twenty - four sites were selected across the p r o v i n c e w i t h v a. rin g a g e a n d r u. 11 i n g p erf o r man c e. T h e r u11 i nq per f or manc e of t he se si t es was r e 1 at ed t o s e v e r a 1 a s p h a 11 c «::• n c r e t e p a r a m e t e r s u s i n g a. r e g r e s s i o n analysis and threshold analysis. The parameters which were studied include; air voids, asphalt content, voids in the mineral aggregate, fractured faces and Marshall stabi1i ty. The regressi on a.na3. ysi s i ndi cated that the r at e of w h e e1 t r ac k r u 11 i ng did no t c or r elate well with any o f the parameters. The threshold analysis was used to identify a p a r a m e t e r va 1 u e wh i c h sep a ra t ed s i t e s w i t h acceptable and unacceptable rutting per formance. Conclusions are drawn regarding the effect of the se1ected aspha11 par amet ers, and some r ec ommendati ons a r e m a d e r e g a r d i n g f u r t h e r r e s e a r c h .
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