Qhov sib txawv ntawm cov ntaub pua plag cement rau cov kav dej hlau ductile EN197-1

Cov kav hlau ductilesiv dav hauv cov kav dej vim lawv lub zog siab, tawv, thiab ruaj khov zoo heev. Txhawm rau tiv thaiv kev xeb sab hauv thiab xyuas kom meej tias dej zoo, lawv feem ntau yog siv cov cement mortar (CML). Hom cement siv rau hauv cov linings no yog qhov tseem ceeb, nyob ntawm qhov chaw siv thiab kev ua haujlwm xav tau.

Cov txheej txheem European EN 197-1: 2011yog tus qauv tseem ceeb rau kev txhais thiab kev faib tawm cov cement feem ntau.Cov cement Portland, cov cement uas tiv taus sulfur, thiab cov cement uas muaj alumina ntau feem ntau yog siv rau cov kav dej hlau ductile.Lawv qhov sib txawv tseem ceeb yog nyob rau hauv lawv cov khoom xyaw mineral, uas cuam tshuam ncaj qha rau qhov ua tau zoo ntawm lub lining.Cov hauv qab no qhia txog qhov sib txawv ntawm peb hom cement uas feem ntau siv:

Cov cement PortlandCov khoom siv hydraulic uas ua los ntawm cov calcium silicate-based Portland cement clinker, tsawg dua 5% limestone lossis granulated blast furnace slag, thiab ib qho nyiaj ntawm gypsum, feem ntau hu ua Portland cement, thiab thoob ntiaj teb hu ua Portland cement.

Cov yam ntxwv ntawm Portland cement muaj xws li kev teeb tsa sai thiab tawv, lub zog thaum ntxov siab, kub ntawm kev nqus dej, zoo tiv taus te, tsis kam corrosion, tsis shrinkage thaum ziab, thiab muaj zog hnav. Nws yog tsim rau cov haujlwm ua vaj tse muaj zog thiab qhov chaw kub qis, tab sis tsis haum rau cov pob zeb loj lossis qhov chaw kub siab, corrosive.

Cov Cement Tiv Thaiv SulfateCov cement Portland uas tiv taus sulfate raug muab faib ua ob pawg raws li nws txoj kev tiv taus sulfate: cov cement Portland uas tiv taus sulfate nruab nrab thiab cov cement Portland uas tiv taus sulfate siab. Cov cement Portland uas tiv taus sulfate nruab nrab yog cov khoom siv hydraulic cementing uas tiv taus kev tawm tsam los ntawm cov concentration nruab nrab ntawm cov sulfate ions, ua los ntawm kev sib tsoo Portland cement clinker nrog cov khoom sib xyaw tsim nyog thiab ntxiv cov gypsum tsim nyog. Cov cement no hu ua P·MSR. Cov cement Portland uas tiv taus sulfate siab yog cov khoom siv hydraulic cementing uas tiv taus kev tawm tsam los ntawm cov concentration siab dua ntawm cov sulfate ions, ua los ntawm kev sib tsoo Portland cement clinker nrog cov khoom sib xyaw tsim nyog thiab ntxiv cov gypsum tsim nyog. Cov cement no hu ua P·HSR.

Cov yam ntxwv ntawm cov cement uas tiv taus sulfate: Cov cement uas tiv taus sulfate yog cov cement tshwj xeeb uas tsim los tiv taus sulfate. Nws yog ua los ntawm Portland cement clinker nrog rau qhov ntau ntawm gypsum ntxiv rau. Nyob ntawm nws qhov kev tiv taus sulfate, nws yog qhov tsim nyog rau cov haujlwm uas raug rau sulfate ntev, xws li chaw nres nkoj, cov haujlwm txuag dej, thiab cov qauv hauv av, nrog rau cov chaw uas raug rau sulfate-corrosive media, xws li cov chaw tsim tshuaj lom neeg thiab cov chaw kho dej phwj tuaj.

Cov cement alumina siabCov cement uas muaj alumina ntau yog cov khoom siv hydraulic uas ua los ntawm cov clinker uas tau calcined thiab av uas feem ntau muaj calcium aluminate thiab muaj kwv yees li 50% alumina. Nws tseem hu ua refractory cement lossis aluminate cement. Nws cov tshuaj lom neeg feem ntau muaj aluminium oxide Al₂O₃ thiab calcium oxide CaO, nrog rau me me ntawm lwm cov oxides xws li SiO₂ thiab Fe₂O₃. Cov ntsiab lus ntawm aluminium oxide feem ntau yog ntau dua 50%, siab dua li cov cement ib txwm muaj. Cov ntsiab lus ntawm aluminium ntau no ua rau nws muaj ntau yam zoo kawg nkaus.

Cov yam ntxwv zoo tshaj plaws ntawm cov cement high-alumina

• Lub Zog Thaum Ntxov: Qhov tshwj xeeb tshaj plaws ntawm cov cement uas muaj alumina siab yog nws lub zog loj hlob sai heev. Hauv 24 teev tom qab nchuav, nws tuaj yeem ncav cuag ntau dua 80% ntawm nws lub zog kawg. Cov yam ntxwv no ua rau nws zoo tagnrho rau cov haujlwm uas yuav tsum tau siv sijhawm ntau xws li cov uas xav tau kev rhuav tshem sai, kev kho thaum muaj xwm txheej ceev, thiab kev tsim kho thaum lub caij ntuj no.
• Kev Tiv Thaiv Kub Siab: Cov khoom siv hydration ntawm cov cement siab-alumina ruaj khov heev ntawm qhov kub siab. Thaum cua sov, nws dhau los ua cov tshuaj tiv thaiv khov kho, tsim cov zaub mov zoo li ceramic tshiab uas tswj tau qee yam zog. Nws feem ntau siv ua cov khoom sib txuas hauv cov castables refractory thiab hauv cov ntaub ntawm cov cub tawg kev lag luam, thiab tuaj yeem tiv taus qhov kub thiab txias heev.
• Kev Tiv Thaiv Kev Xeb: Nws tiv taus kev tawm tsam tshuaj lom neeg los ntawm sulfates, cov kua qaub tsis muaj zog, thiab lwm yam tshuaj lom neeg dua li Portland cement ib txwm muaj. Qhov no yog vim nws cov khoom hydration tsis tsim cov calcium hydroxide thiab calcium aluminate hydrates, uas yooj yim rau kev tawm tsam sulfate. Qhov no ua rau nws muaj txiaj ntsig zoo rau kev siv hauv cov chaw ua haujlwm corrosive, xws li cov chaw ua haujlwm tshuaj lom neeg, cov dej phwj tuaj, thiab kev tsim kho dej hiav txwv.