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IRF2005会议论文摘要 W35：公路III

　更新时间：2005年07月12日 　来源：　作者：


第十五届国际道路联盟世界会议 ——会议论文摘要
W35：公路III      

191有关新型减压材料的限制因素分析报告  
作者：中国，武汉科技大学，Shaopeng Wu

A number of past studies have indicated that periodically change of temperature in low temperature condition is the most important reason of asphalt pavement cracking. Because semi-rigid type base already have cracks, the stress focus comes into being when semi-rigid type base periodically move resulting from temperature periodically changes. Stress focus conduces cracks rapidly extend to the surface we call it reflection crack resulting from low temperature shrinkage.

This paper on the base of the study of material composition of new stress-absorbed materials and experimentation of mechanical properties, adopting the finite element software Ansys program, accounts the stress and strain on crack tip in asphalt over layer under temperature load by different measures of avoiding reflection crack. The result indicated that new type of stress-absorbed layer can efficiently improve the stress status in asphalt layer. Because of the new stress-absorbed layer have structure thickness, comparing with traditional method—geosynthetics and glass geogrid, new stress-absorbed materials have more reasonable structure and better effect.

192混凝土大桥的桥面  
作者：巴西，UNICAMP，Creso F Peixoto

In this work, a selected pavement over the concrete bridge deck is made after the conclusion of the overpass structure, considering the bridge deck as a special sub-grade. In this case, the adherence between pavement and bridge deck is obtained through special bond. This paper presents a special study on the shear stresses generated in a typical Brazilian pavement-deck system, built by stuck layer mode, with slabs of 8 to 12 centimetres, submitted by Brazilian regulative load, specific to project bridges and viaducts. This study aims the insight of failures occurrence and to predict them, focusing a typical Brazilian case.

193 Formula 1赛车道的新型多孔渗水沥青  
作者：法国，COLAS，Michel Ballié

Conventional porous asphalts are not able to withstand the major tangential shear that racecars create during a Formula 1 race.

Damage and loose aggregates appear very quickly. This is the reason why conventional porous mixes are no longer used.

However, porous asphalt’s excellent drainage capacity helps evacuate rainwater off the surface very quickly, thus reducing splash and spray behind vehicles. Porous asphalt’s properties greatly improve driver safety and visibility in rainy weather. This paper presents a new porous asphalt mix design that offers both excellent drainage capacity and heavy-duty shear strength, easily comparable to that of the best asphalt concretes used on Formula 1 race circuits, in particular in Magny Cours, France.

A laboratory test method was developed to assess this type of porous mix. It is used to define and select the optimum grading curve to obtain long-lasting, heavy-duty drainage capacity.

A heavily modified elastomer binder ensures excellent cohesion and shear strength. The binder also confers good behavior in cold and hot operating temperatures. This paper presents: . • A description of the porous mix design and performance in laboratory tests. . • The binder’s main properties. • The test sections done on a circuit in France and behavior as regards drainage capacity and shear strength after one full year of use.

194新型减压材料的准备及研究  
作者：中国，武汉科技大学，Shaopeng Wu

The reflection crack is the most grievous disease whether on a semi-rigid type base course or in AC over layer. This paper studies and prepares new type of stress-absorbed materials, which can be constructed in normal temperature. New type of stress-absorbed materials can greatly decrease the construction cost and in the same time greatly improve the working condition. New stress-absorbed materials have low modulus of elasticity, high ultimate tensile stress and strain and strong distortion ability, so it can alleviate stress focus in asphalt over layer when temperature changes. This paper studies the composition design of new stress-absorbed materials, which are cemented by neoprene latex, and researches the mechanical properties through experimentation. It indicates from theory and experimentation, that new stress-absorbed materials have strong ability to reduce reflection crack.