Research On The Expressway Overlays Application Of The Fiberglass-Polyester Paving Mat

With the rapid development of expressway, semi-rigid asphalt pavement were widely used and researched in China. The pavement performance of the expressway constructed during early age is decreasing with age due to traffic load and climate environment and so on. Crack is one of main roots of bad roughness or premature distresses. In order to rehabilitate pavement performance, to improve the capacity of traffic and prolong the highway overlay's life, a lot of designs and technology studies of postponeing cracking were processed. However, the effects of anti-crack are not successfully satisfactory. How to reduce crack and prevent crack reflecting to expressway asphalt concrete surface is an important maintain problem for pavement construction deparment and management department. Therefore, it is always an important project application value to develop and research a new material which can prevent crack effectively.Fiberglass-Polyester paving mat is a hybrid of fiber glass and polyester and has the best qualities of both materials working together to protect the pavement. This unique formulation gives it the strength of fiber glass with the flexibility of polyester. Compared with other geofabrics, Fiberglass -Polyester paving mat has the following advantages: it is easy to install, non-shrink and non-stretch, good high temperature stability can be milled and reused in asphalt mixtures. At the same time, the layer composed by the paving mat and adhesive asphalt can prevent the infiltration of surface water into the pavement structure and disperse stress.Project characteristics of Fiberglass-Polyester paving mat are analyzed through a series of lab test. A great deal of tests such as cohesion performance, anti-permanence property, low-temperature anti-crack performance and permeability property were carried out. In this paper, several commonly used dense-graded asphalt mixtures were tested in beam fatigue using a UTM system(Strain controlled test) and MTS system(Stress controlled test). The fatigue property of asphalt mixture is evaluated using energy index; and then the effect of Fiberglass-Polyester paving mat in mitigating reflective crack is studied and analysised by impactive tenacity/toughness test and lab reflective crack simulation test.Finally, some applications and field tests were performed in order to evaluate the performance of Fiberglass-Polyester paving mat, and some construction technics and notice proceedings were summarized through test road.The results of this paper indicate that Fiberglass-Polyester paving mat, which is an excellent maintenance method, can retard crack occurring and developing, prevent water infiltration into pavement structure and improve pavement strength effectively etc. In the meantime, economic benefit of the paving mat is good. Therefore, it will be widely used in domestic expressway pavement maintenance and construction and should be popularized to resolve the question of deterioration in expressway and expressway overlays.