DBM txheej yog dab tsi?
DBM txheej yog dab tsi?

Video: DBM txheej yog dab tsi?

Video: DBM txheej yog dab tsi?
Video: Hmong new song 2016 - Yog dab tsi - Xub Hluav Taws (Official MV) 2024, Kaum ib hlis
Anonim

DBM : nws stands rau ntom bituminous mecadam. Nws yog chav kawm bituminous thiab ua raws li kev hnav khaub ncaws ua raws li cov pob zeb bituminous tshaj nws. WBM: water bound mecadam. Nws muaj ib txheej ntawm ballast sprinkled nrog cov ntaub ntawv muab tub lim thiab dej tshaj nws.

Tom qab ntawd, DBM yog dab tsi hauv kev tsim kho?

Dense Bituminous Macadam ( DBM ) yog ib tug binder courseused rau txoj kev nrog rau ntau lub tsheb lag luam hnyav thiab cov khoom siv sib xyaw ua ke uas muaj cov ntsiab lus voids ntawm 5-10 feem pua.

Ib tug kuj yuav nug, DBM daim ntawv puv yog dab tsi? Qhov kev qhia dBm ib yog siv los txiav txim siab lub zog ntawm cov xov hlau thiab cables ntawm RF thiab AF zaus. Cov cim yog cov ntawv luv rau "decibels txheeb ze rau ib milliwatt," qhov twg milliwatt (1 mW) sib npaug 1/1000 ntawm ib watt (0.001 W lossis 10-3 W). Chav tsev no feem ntau yog siv rau hauv cov chaw kuaj mob.

Hais txog qhov no, DBM thiab BC yog dab tsi?

DBM (Dense Bituminous Macadam) thiab BC (Bituminous Concrete) yog cov txheej saum toj kawg nkaus ntawm Bituminous TopRoads, uas nws thickness yog txiav txim siab kuv MSA & CBR. CBR ranges ntawm 3% mus rau 15% rau txoj kev yooj yim raws li perIRC: 37-2012.

Lub txheej sab saum toj ntawm txoj kev hu ua dab tsi?

Cov txheej saum toj kawg nkaus ntawm txoj kev pavement ncaj qha cuam tshuam rau kev khiav tsheb yog hu ua yog hu ua hnav cov hoob kawm los yog surfacing. Nws tuaj yeem muaj ib lossis ntau tus lej txheej nyob rau hauv cov ntaub ntawv uas hloov tau pavements. Ib qho hnav khaub ncaws zoo yuav tsum yog impervious thiab huab cua tiv taus. nws yuav tsum muaj peev xwm tiv taus abrasive kev ua ntawm kev khiav tsheb.

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