Lo lus "freeze-thaw cycle" tej zaum yuav zoo li kev txawj ntse, tab sis nws ntes cov kev sib tw tseem ceeb ntawm kev ciaj sia rau cov khoom siv hauv tsev hauv huab cua txias. Raws li tus kws tshaj lij hauv fiber ntau gypsum board, kuv tau txais cov lus nug tas li hais txog sab nrauv cladding, thiab ib qho tuaj yeem tuaj ntau dua li lwm yam: Puas tuaj yeem tsim cov fiber ntau cement pawg thawj coj saib khov kho -thaw cycling? Cia peb tawg nws los ntawm cov khoom nws tus kheej.
Dej ua haujlwm nws txoj hauv kev mus rau hauv cov khoom siv lub qhov hws, khov ntawm qhov kub thiab txias, thiab nthuav dav hauv ntim li 9%. Nws zoo li suav tsis txheeb me me hydraulic jacks nias sab nraud ntawm sab hauv lub rooj tsavxwm ib zaug. Ib qho khov yuav tsis ua ntau, tab sis rov ua kom khov, thawing, thiab rov ua kua muag rov qab txawm tias cov ntaub ntawv tuab sib nrug. Kev ntxhov siab ntau ntxiv tsim microcracks uas thaum kawg ua rau spalling, ntog, thiab kev ua haujlwm tsis ua haujlwm. Qhov ntawd yog lub hauv paus ntawm khov -thaw kev puas tsuaj. Rau engineered fiber ntau cement board, lo lus nug yog seb nws puas tuaj yeem cuam tshuam lub voj voog vicious.
Engineered fiber ntau cement board yog feem ntau teev rau sab nrauv phab ntsa, eaves, thiab lwm qhov chaw raug los nag thiab daus rau ib qho laj thawj zoo: nws tau tsim nyob ib puag ncig ib puag ncig ntom ntom, qis- pob txha pob txha. Nws cov cement matrix yog ua ke nrog cov nroj tsuag -raws li los yog hluavtaws fibers thiab tom qab ntawd kho nyob rau hauv siab -sab siab ntawm qhov kub siab, tsav lub hydration tshua ze rau ua tiav. Qhov tshwm sim microstructure tsis zoo li daim txhuam cev -zoo li capillary network ntawm cov pob zeb zoo tib yam. Nws yog zoo li tag nrho compacted, nyuaj pob zeb. Cov dej dawb dhau los tawm tsam kom nkag mus tob, thiab txawm tias cov av noo noo nyob hauv qhov ntiav. Yog tsis muaj dej txaus sab hauv, khov -thaw kev ua haujlwm raug tshem tawm ntawm qhov chaw.
Lub fiber yog qhov hloov pauv kev ua si. Cov fibers txhawb nqa no, uas tau tawg thoob plaws hauv cov cement matrix, ua haujlwm raws li cov leeg hloov tau yooj yim straddling ntau yam kev sib tshuam. Raws li cov dej khov nab kuab loj tuaj thiab ua rau muaj kev ntxhov siab, cov fibers no nqus thiab faib lub zog los tiv thaiv micro- tawg los ntawm kev tsim cov kev sib txuas tam sim. Cov txheej txheem ntawm toughening no muab lub rooj tsavxwm nrog qee lub peev xwm los tiv thaiv kev tawg ua ntej tawg tsis zoo li ntau lwm yam khoom siv nkig. Xwb, nws qhia tau hais tias qeeb heev, maj mam nto hnav.
Txhawm rau txheeb xyuas qhov nyuaj, koj tshuaj xyuas khov -thaw kuaj. Hauv kev ntsuas tus qauv, cov qauv yog tsau rau hauv dej kom txog rau thaum saturated, tom qab uas lawv tau cycled nyob rau hauv ib lub chamber: khov rau ob peb teev nyob ib ncig ntawm -20℃ua ntej thawing ze 20 degree. Tom qab 100, 200 lossis txawm 300 lub voj voog lub rooj tsavxwm tau tshuaj xyuas qhov pom kev pom thiab tom qab ntawd ntsuas qhov poob thiab khaws cia ntawm lub zog flexural. Lub bona fide freeze-thaw resistant txhaj tshuaj fiber ntau cement board khaws tsawg kawg yog 85% ntawm nws lub zog tom qab 200 cycles uas tsis dhau - cracking thiab xoom delamination. Cov khoom uas tuaj nrog cov ntawv xeem no yog cov uas tuaj yeem ua raws li cov xwm txheej.
Tau kawg, tsis yog txhua qhov fiber ntau cement board sib npaug. Kev ua tau zoo hinges ntawm formulation thiab manufacturing precision. When density is too low, curing is inadequate, or fiber distribution is uneven, the board fails early in freezing weather. Qee cov khoom txis qhov ceev kom txuag tau qhov hnyav, thiab capillary dej nqus skyrockets - qhov yooj yim tuav khov-thaw ua rau cov yuam sij. Yog vim li cas kev qhia "fiber cement board" tsis txaus. Koj yuav tsum nug kom paub meej cov dej nqus dej, khov- qhov ntsuas kev tiv thaiv, thiab cov ntaub ntawv thib peb- cov ntaub ntawv xeem. Qhov ntawd yog qhov hnyav tiag tiag.
Qhov no kuj yog qhov uas peb kos ib txoj kab meej: fiber ntau cement board lub khov -thaw kev ua tau zoo hais tsis muaj dab tsi txog fiber ntau gypsum board. Gypsum-raws li cov ntaub ntawv muaj nyob hauv cov dej noo-sensitive. Ntxiv cov fibers txhua yam koj xav tau, tab sis thaum lawv raug ntes rau hauv ntub dej rov qab - voj voog qhuav thiab khov -thaw raug, cov qauv siv lead ua dissolves thiab recrystallizes, thiab lub zog poob sai. Qhov ntawd tsis yog qhov teeb meem zoo; nws tsuas yog cov khoom qhov xwm txheej. Fiber gypsum board belongs rau sab hauv tsev - ceilings, partitions, qhuav qhov chaw. Cia fiber ntau cement board coj mus rau sab nraud. Qhov ntawd yog qhov kev ua si uas tsim nyog xwb.
Yog li, puas tuaj yeem tsim cov fiber ntau cement board sawv ntsug kom khov -thaw cycles? Cov lus teb yog ncaj nraim. Lub siab - pawg thawj coj saib zoo uas tsim los rau cov qauv kev tsim vaj tsev zoo tsis yog tsuas yog muaj sia nyob ntawm cov voj voog - nws tau tsim los rau lawv. Qhov sib txawv tiag tiag tsis nyob hauv daim ntawv lo. Nws yog nyob rau hauv kev xaiv cov khoom tsim nyog thiab muab tso rau hauv qhov chaw zoo. Thaum koj nkag siab tias khov npaum li cas -thaw ua haujlwm tau zoo, koj tuaj yeem pom yav dhau los daim ntawv spec thiab paub txog qhov kev ntseeg siab nyob ntsiag to ua rau hauv lub rooj tsavxwm.