Txoj kev txhim kho ntawm cov dej tsis muaj zog tuaj yeem faib ua cov theem hauv qab no:
Cov khoom siv dej tsis muaj dej: hauv tib neeg thaum ub, tib neeg siv cov khoom ntuj lossis pob tsuas yog chaw nyob. Txoj kev no tau txais txiaj ntsig zoo ntawm qhov teeb meem ntawm cov tswv yim thaum ntxov ntawm waterproofing. Nrog kev nce qib ntawm cov khoom lag luam, cov neeg tau pib siv cov ceg, tawv ntoo, thiab siv cov ntawv vov tsev, txawm hais tias cov nyhuv waterproof, txawm hais tias cov khoom siv dej tsis muaj txiaj ntsig.
Cov khoom siv tsis zoo nkauj niaj hnub: kev txhim kho cov ntaub ntawv tsis zoo niaj hnub tau pib nrog cov ntawv thov asphalt. Kev siv ntawm asphalt tau dhau los ntawm cov theem ntawm ntuj asphalt, roj av asphalt, thiab polymer-hloov asphalt. Cov tshuaj lim dej thaum ntxov tau ua tiav tau zoo li asshalt xav, uas tau qhia rau Suav teb hauv 1920s. Tom qab lub tsom iav ntawm Suav teb tshiab, kuv lub teb chaws tsim muaj ntau yam ntawm cov khoom lag luam muaj txiaj ntsig. Xyoo 1952, kev lag luam hauv tebchaws tau txais txog 15 lab square metres.
Niaj hnub cov ntaub ntawv tsis zoo niaj hnub: txij li xyoo 1980s, nrog rau kev txhim kho kev lag luam thiab kev tsim kho sai sai ntawm kev tsim kho cov chaw lim dej tau txuas ntxiv. Kuv lub teb chaws tau tsim hluavtaws polymer waterproofing nyias nyias xws li sepdm roj hmab, thiab muaj tus kheej tsim cov slAll Cov ntaub ntawv no tau txhim kho cov kev ua tau zoo thiab tsawg thiab kav ntev los ntawm kev ntxiv polymer modifiers.
Kev tsim kho diversified ntawm waterproofing wee: niaj hnub waterproofing membranes tsis yog tsuas yog cov ntaub ntawv tshiab, tab sis kuj txuas ntxiv ua kom nthuav dav hauv cov haujlwm. Piv txwv li, polymer hloov kho dej cawv txiv hmab tau siv dav nyob rau hauv lub caij nyoog ntawm kev siv hluav taws xob zoo siab, thiab cov khoom siv hluav taws xob zoo siab rau cov khoom lag luam Tsis tas li ntawd, sawv ntawm tus kheej-nplaum hloov asphalt hloov asphalt mletstranes tau maj mam tsim kho qhov kub thiab ua raws ib puag ncig kev tiv thaiv.
