Study of High-Temperature Properties of Asphalt Mixtures Used for Bridge Pavement with Concrete Deck.

Piotr Pokorski,Michał Sarnowski,Piotr Radziszewski

doi:10.3390/ma14154238

Abstract

The paper presents the issue of resistance to permanent deformations of bridge pavements placed upon concrete bridge decks. In Europe, bridge asphalt pavement usually consists of a wearing course and a protective layer, which are placed over the insulation (waterproofing). Protective layers of bridge pavement are commonly constructed using low air void content asphalt mixes as this provides the suitable tightness of such layers. Due to increased binder content, asphalt mixes for bridge pavement may have reduced resistance to permanent deformations. The article presents test results of resistance to permanent deformations of asphalt mixes for the protective layers. In order to determine the composition of mixtures with low air void content and resistance to permanent deformation, an experimental design was applied using a new concept of asphalt mix composition. Twenty-seven different asphalt mixture compositions were analyzed. The mixtures varied in terms of binder content, sand content and grit ratio. Resistance to permanent deformation was tested using the laboratory uniaxial cyclic compression method (dynamic load creep). On the basis of experimental results and statistical analysis, the functions of asphalt mixture permanent deformation resistance were established. This enabled a determination of suitable mixture compositions for protective layers for concrete bridge decks.

Highlights

Bridge pavement works under very specific load conditions
Asphalt bridge pavement is subjected to specific working conditions relative to pavements located on the ground and requires a different approach to modeling the structural layer asphalt mix composition—the protective layer in particular
The state of the art shows that designing the composition of mixtures for protective layers does not take into account the specific working conditions and the function that this layer must perform in the bridge pavement

Summary

Introduction

Bridge pavement works under very specific load conditions. The bridge pavement is more exposed to rapid temperature changes and climatic factors than pavement on the earth foundation. The aggressiveness load is higher [1,2,3,4,5]. Because the bridge pavement is much thinner than the standard road pavement, the stresses and strains are much higher [6,7,8]. There is a possibility of various types of damage. The most common types of damage are fatigue cracks on bridges with steel decks and permanent deformations on bridges with concrete decks [3,9,10,11]. The paper describes pavement on concrete decks

Methods

Results

Conclusion