1.3.3.Subbase CourseThe subbase cou

1.3.3.Subbase Course
The subbase course is between the base course and the subgrade. It functions
primarily as structural support but it can also:
1.Minimize the intrusion of fines from the subgrade into the pavement structure.
2.Improve drainage.
3.Minimize frost action damage.
4.Provide a working platform for construction.
The subbase generally consists of lower quality materials than the base course but better than the subgrade soils. A subbase course is not always needed or used. For example, a pavement constructed over a high quality, stiff subgrade may not need the additional features offered by a subbase course so it may be omitted from design. However, a pavement constructed over a low quality soil such as a swelling clay may require the additional load distribution characteristic that a subbase course can offer. In this scenario the subbase course may consist of high quality fill used to replace poor quality subgrade (over excavation)

ผลลัพธ์ (สวาฮิลี) 1:

1.3.3.Subbase kozi
kozi SUBBASE ni kati ya shaka msingi na subgrade. Ni kazi
hasa kama msaada wa miundo lakini inaweza pia:
1.Minimize intrusion ya faini kutoka subgrade katika muundo lami.
2.Improve mifereji ya maji.
3.Minimize baridi action uharibifu.
4.Provide jukwaa kazi kwa ajili ya ujenzi.
SUBBASE ujumla lina vifaa ubora wa chini kuliko kozi msingi lakini bora kuliko udongo subgrade. Bila shaka SUBBASE si mara zote zinazohitajika au kutumika. Kwa mfano, lami yalijengwa juu ya shaba, subgrade ngumu wanaweza haja sifa ya ziada zinazotolewa na bila shaka SUBBASE hivyo inaweza kuwa omitted kutoka kwa kubuni. Hata hivyo, lami yalijengwa juu ya chini ya udongo kama vile uvimbe udongo kuhitaji ziada mzigo usambazaji tabia kwamba bila shaka SUBBASE anaweza kutoa. Katika hali hii bila shaka SUBBASE ili wajumbe ubora wa juu kujaza kutumika badala duni subgrade (zaidi ya excavation)