Miaomiao Li

Bio: Miaomiao Li is an academic researcher from Chang'an University. The author has contributed to research in topics: Base course & Reflection (physics). The author has an hindex of 1, co-authored 1 publications receiving 2 citations.

Justification Constructions of the Road Pavement Under Conditions of Changing Road Surface Temperature

Abstract: The article analyzes regulatory and technical documents and research results that apply to the design of road pavements, identifies the main simplifications allowed in the calculations of structural layers of road pavements, such as incomplete correspondence of design schemes to real operating conditions of structures, inconsistency of standard strength characteristics with actual loads, lack of accounting indicators of weather conditions, changes in the temperature of asphalt concrete during its operation. These errors, according to the authors, lead to the premature destruction of road pavements. In the course of experimental studies, tests were carried out to determine the Poisson’s ratio for asphalt concrete. During the tests, the deformation and strength characteristics of asphalt concrete were clarified through the Poisson ratio. In the course of laboratory experiments, the assumption was confirmed that Poisson’s ratio for various types and compositions of asphalt concrete depends on the temperature and load level, as well as the loading rate. To carry out the experiment, a research methodology was proposed to determine Poisson’s ratio at various temperatures and load levels. The recommended design features of the operation of road pavements in conditions of temperature differences have been substantiated.

The use of an asphalt polymer/glass fiber reinforcement system for minimizing reflection cracks in overlays and reducing excavation before overlaying

Abstract: This paper describes the successful development of the use of glass fibre reinforcement in conjunction with an asphalt polymer to minimize reflection cracks in an asphalt overlay. The system is also used to reduce excavation of deteriorated cracks and joints before overlaying. The glass fibre reinforcement is a high strength woven glass with a tensile strength of 1750 n/cm (1000 lb/in) width. The asphalt polymer was specially designed for use with the glass fibre reinforcement and has excellent properties of adhesion, low-temperature flexibility, and high softening point. The asphalt polymer adheres to the old road, the glass fibre reinforcement, and the new overlay, protects the glass fibre reinforcement, acts as a stress relieving membrane, and transfers the stresses to the reinforcement. The glass fibre reinforcement distributes the stress over the width of the repair to a level below the fracture point of the overlay. Over a five-year period 150 field trials were set up in 21 states. It was found that the reinforcement system was 89% effective in reducing reflection cracks. The average age of the trials was 21 months. All trials were exposed to a minimum of one winter. For the covering abstract of the symposium see IRRD 286635. (TRRL)