By Lubinda F. Walubita
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Extra info for Asphalt Material Characterization, Accelerated Testing, And Highway Management
KEYWORDS: road engineering; asphalt pavement; variance analysis method; correlation analysis method; rutting; mechanical properties 39 40 GEOTECHNICAL SPECIAL PUBLICATION NO. 190 INTRODUCTION Rutting is the load-induced permanent deformation of asphalt pavements and may occur in any layer of a pavement structure (Witezak et al. 1997). It is one of the main distresses occurring in asphalt pavements and badly affects the comfort-ability, ride-ability, motorist safety, and general performance (Haas et al.
The penetration of the base asphalt was 68 at 25ć. These two gradations satisfied the requirements of Technical Specifications for Construction of Highway Asphalt Pavements in China (4). The aggregate gradations for the two mixtures are given in Table 1. Table 1. 11 Permanent deformation(mm) The PD of the two mixtures at five temperatures is shown in Figure 2. Evidently, PD increases with temperature for the two mixtures. What’s more, the PD of design gradation 1 is higher than that of design gradation 2 at all the temperatures except for 40ć.
Cn. ABSTRACT: Partial hourly pavement temperature variation measured in Shanghai was analyzed. Cumulative frequency of high temperature (above 50ć defined in this paper) was more than 90%. However, cumulative frequency of moderate temperature (20 ć to 50 ć defined in this paper) was less than 10%. Then permanent deformation (PD) of two asphalt mixtures at the temperatures ranging from 20ć to 60ć was measured using the APA (asphalt pavement analyzer). The results show that PD at 40ć can be as high as 50% of that at 60ć.
Asphalt Material Characterization, Accelerated Testing, And Highway Management by Lubinda F. Walubita