柔性路面外文翻譯-其他專(zhuān)業(yè)-資料下載頁(yè)
2025-01-19 05:53本頁(yè)面
【導(dǎo)讀】一般來(lái)講，路面(和路基)可以分為兩種類(lèi)型：剛性路面和柔性路面。一詞在美國(guó)通常指由普通水泥混凝土修筑的道路面層。像梁一樣具有較高的彎曲強(qiáng)度并能夠跨越基層或路基上一些微小的小平整的地帶，因此稱(chēng)為“剛性”。同樣，支撐磚層或砌體層的混凝土基座也可以說(shuō)成是剛性的。間的嵌擠力、顆粒的摩擦力和黏結(jié)力來(lái)保持其穩(wěn)定性。將有優(yōu)質(zhì)材料用于面層或面層附近。應(yīng)該指出，某些瀝青路面與傳統(tǒng)的剛性路面有。周期短、維修簡(jiǎn)便等特點(diǎn)，而被廣泛應(yīng)用。人們乘車(chē)在高速公路上行駛，平整度能。對(duì)于低成本、交通量不大的道路的瀝青路面，面層的厚度不應(yīng)低于1in；輛荷載作用下的推擠和碾壓。除此之人外，面層還應(yīng)該能有效地阻止過(guò)量的表面積。它的主要作用是將車(chē)輛荷?；鶎舆€必須具有能夠抵抗由毛細(xì)水或冰凍作用產(chǎn)生的損。的平整度影響可謂舉足輕重。材料便宜的地區(qū)。最大荷載的數(shù)值通常由法定的荷載限度來(lái)控制。心組織施工，才能保證路面平整度，提高路面工程質(zhì)量。
【正文】 f repeated applications of variablemagnitude loadings. The magnitude of maximum loading is monly controlled by legal load surveys and loadometer studies are often used to establish the relative ma gnitude and occurrence of the various loadings to which a pavement is subjected. Prediction or estimation of the total traffic that will use a pavement during its design life is a very difficult but obviously important task. The climate or environment in which a flexible pavement is to be established has an important influence on the behavior and performance of the various materials in the pavement and subgrade. Probably the two climatic factors of major significance are temperature and moisture. The magnitude of temperature and its fluctuations affect the properties of certain materials. For example, high temperatures cause asphaltic concrete to lose stability whereas at low temperatures asphaltic concrete bees very hard and stiff. Low temperature and temperature fluctuations are also associated with frost heave and freezethaw damage. Granular materials, if not properly graded, can experience frost heave. Likewise, the subgrade can exhibit extensive loss in strength if it bees frozen. Certain stabilized materials (lime, cement, and limefly ash treated) can suffer substantial damage if a large number freezethaw cycles occur in the material. Moisture also has an important influence on the behavior and performance of many is an important ingredient in frostrelated damage. Subgrade soils and other paying materials weaken appreciably when saturated, and certain clayey soils exhibit substantial moistureinduced volume change. The surface that the roughness of road surface of flexible pavements involves is very wide, there are a lot of influence factors, concern the whole course of road bed , road surface construction, the situation is plicated, some are caused by the mechanical performance , some are the manual operation , arrange for the fault to cause, we only could suit the remedy to the case and do a good job of every tiny link while constructing after fully researching and analysing the reason produced . The roughness of road surface of pitch is construction machinery , personnel39。s quality , prehensive reflection of petence of operating, only strengthen the management of construction site, anize
高考資料相關(guān)推薦
鄂ICP備17016276號(hào)-1