底基层和基层Section3

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1、Section300SubbaseandBaseCourses错误！未指定书签。底基层和基层300.1Description工作内容说明Thisworkshallconsistoffurnishing,spreadingandcompactinggradedsubbaseandbasematerialincludingasphalticbasecourse,constructedonapreparedbedinaccordancewiththesespecificationsandtothelines,gradesandcross-sectionsshownonthedrawin

2、gsand/orasdirectedbytheEngineer.本章工作包括按照规范要求提供分级底基层和基层材料（含沥青基层）、根据图纸和（或）工程师指定的边线、坡度和横断面将之摊铺到准备好的基础面上并进行压实。MaterialsandconstructionrequirementsforthisworkarespecifiedunderSections301,302,303and304.实施本章工作所必需的材料和施工要求分别在第301、302、303和304节进行了说明。300.2SamplingAndTesting取样和试验Samplingandtesting,unlesso

3、therwisestated,shallbeaccordingtothestandardmethodsprescribedinthelatesteditionoftheAmericanAssociationofStateHighwayandTransportationOfficials（AASHTO）StandardSpecificationsandMethodsofSamplingandTesting.Anydeviationsfromthemethodsandproceduresprescribedthereinmaybemadeonlyasdirectedinwriting

4、bytheEngineer.AnymaterialswhichdonotconformtotherequirementsoftheSpecificationswillberejectedwhetherinplaceornot.TheyshallberemovedimmediatelyfromthesiteoftheworkattheContractorsexpense.除非另有规定，取样和试验工作应符合AASHTO标准的最新版木要求以及《取样与试验方法》中的规定。任何与这些标准相背离的方法和程序只冇工程师才可以给出书面决许可。无论是否已经填筑，凡不符合规范要求的材料都应该弃Z不用

5、。不合格材料应立即从工地清除，费用由承包商负担。300.2.1SelectionofPlaceofSampling取样位置选择Theselectionofrepresentativesamplesfortestingshallbebynrandomsamplingmethod”，bywhicheverypartofalotorunithasanequalchancetobeselected.Whenitisnecessaiytosamplestockpiles,everyeffortshouldbemadetoenlisttheserviceofpowerequipmenttha

6、tiscapableofexposingthematerialatvariouslevelsandlocations.Insamplingsandfromstockpiles,theouterlayerwhichmayhavebecomedry,causingsegregationshallberemovedandrepresentativesamplesofthedampsandselected.选取典型样品应采用“随机取样法”，通过这种方法，每一批或每单位材料都冇均等的机会被选中。若必需从储料堆上采样试验时，应尽量使用动力设备，该设备才能够使得各个高程和位置的材料显露111^

7、0当从储料堆中取沙样时，应把外层（因变干而分离）的沙子清理走,然后从湿沙小选取代表样品。300.2.2ScheduleforsamplingandTesting取样试验计划Thesamplingfrequency,acceptancelimitsandotherpertinentinformationforpropercontrolofeachworkitemshallbeasgivenin"TablesforSamplingandTestingFrequency"whichpr