1. Hauv cov txheej txheem ntawm kev txhim kho hauv tsev, cov kav dej hlau tuaj yeem siv los ua cov kav dej kub. Yog tias lawv yog cov kav hlau tsis muaj steel, cov kav dej tooj liab, thiab lwm yam, vim tias cov khoom siv no yog cov kav dej kub zoo, nws muaj cov dej permeability zoo thiab kev txuag hluav taws xob zoo. Txawm li cas los xij, cov yeeb nkab hlau tsis tiv taus khawb, thiab nws yooj yim rau xeb thaum siv, uas yuav cuam tshuam rau cov dej zoo.
2. Thaum txhim kho cov kav dej, cov kav dej yas, xws li cov kav dej ppr thiab PB kav, tuaj yeem siv tau. Cov khoom no kuj muaj qhov zoo corrosion kuj thiab siab tsis kam, tab sis kub kuj tseem phem heev, thiab nws muaj peev xwm tiv taus qhov siab tshaj plaws Qhov kub ntawm 60 thiab 70 degrees. Yog tias nws tuaj yeem siv los ua cov kav dej kub rau lub sijhawm ntev, nws yooj yim ua rau deformation thiab tawg ntawm cov yeeb nkab.
3. Cov kav dej yas-clad hlau tuaj yeem siv rau kev teeb tsa cov kav dej kub. Cov kav dej ntawm cov khoom siv no tsis tsuas yog muaj kev tiv thaiv zoo corrosion thiab kub ua hauj, tab sis kuj yooj yim rau kev tsim kho. Tom qab nkag mus rau hauv phab ntsa, yuav tsum tau ua ib qho kev ntsuas nruj nruj tom qab kev tsim kho kom tsis txhob muaj teeb meem tsis tsim nyog.