英语翻译Located immediately above the subgrade,the subbase compo

英语翻译
Located immediately above the subgrade,the subbase component consists of material of a superior quality to that which generally is used for subgrade construction.The requirements for subbase materials are usually in terms of the gradation,plastic characteristics,and strength.When the quality of the subgrade naterial meets the requirements of the subbase materal,the subbaase component may be omitted.in cases where suitable subbase material is not readily available,the available material can be treated with other materials to achieve the necessary properties.this process of treating soils to improve their engineering properties is known as stabilization.
the base course lies immediately above the subbase.It is placed immediately above the subgrade if a subbase course is not used.This course usually consists of granular materials such as crushed stone,crushed or uncrushed.This course usually consists of granular materials.The specifications for base course materials usually include stricter requirements than those for subbase materials,particularly with respect to their plasticity,gradation,and strength.Materials that do not have the required properties can be used as base materials if they are properly stabilized with Protland cemend,asphalt,or lime,In some cases,high-quality base course materials may also be treated with asphalt or Portland cement to improve the stiffness characteristics of heavy-duty pavements.

位于马上以上路基,底基层部分包括物质的优越品质,以说,一般是用于路基施工中的要求,为基层材料通常而言层次,塑料特性,并结实.当高质量的路基材料是符合要求的基层材料,基层组成,可省略的情况下,适当的底基层材料,是...