Cov tshuaj nplaum uas nws tus kheej siv tau nws qhov hnyav los ua lub hauv paus tiaj tus, du thiab muaj zog rau ntawm cov khoom siv rau kev tso lossis sib txuas lwm yam khoom, thiab tib lub sijhawm nws tuaj yeem ua tiav kev tsim kho loj thiab ua haujlwm tau zoo. Yog li ntawd, qhov dej ntws zoo yog ib qho tseem ceeb heev ntawm cov tshuaj nplaum uas nws tus kheej siv. Tsis tas li ntawd, nws yuav tsum muaj qee qhov kev tuav dej thiab lub zog sib txuas, tsis muaj qhov tshwm sim ntawm kev sib cais dej, thiab muaj cov yam ntxwv ntawm kev rwb thaiv tsev kub thiab qhov kub qis.
Feem ntau, cov tshuaj mortar uas nws tus kheej leveling yuav tsum tau fluidity zoo, tab sis qhov fluidity ntawm cov cement paste feem ntau tsuas yog 10-300px xwb; cellulose ether yog ib qho tseem ceeb additive ntawm cov tshuaj mortar sib xyaw, txawm hais tias qhov ntxiv tsawg heev, nws tuaj yeem txhim kho qhov kev ua tau zoo ntawm Mortar, nws tuaj yeem txhim kho qhov sib xws, kev ua haujlwm, kev sib txuas thiab kev ua haujlwm ntawm cov tshuaj mortar. Nws ua lub luag haujlwm tseem ceeb heev hauv kev ua haujlwm ntawm cov tshuaj mortar sib xyaw.
1. Kev ntws: Cellulose ether muaj feem cuam tshuam tseem ceeb rau kev khaws dej, kev sib xws thiab kev ua haujlwm ntawm cov tshuaj khib nyiab uas tus kheej. Tshwj xeeb tshaj yog raws li cov tshuaj khib nyiab uas tus kheej, kev ntws yog ib qho ntawm cov cim qhia tseem ceeb rau kev ntsuam xyuas kev ua haujlwm ntawm tus kheej. Raws li lub hauv paus ntawm kev ua kom muaj cov khoom sib xyaw ib txwm muaj ntawm cov tshuaj khib nyiab, qhov kev ntws ntawm cov tshuaj khib nyiab tuaj yeem hloov kho los ntawm kev hloov pauv qhov ntau ntawm cellulose ether. Txawm li cas los xij, yog tias qhov ntau dhau, qhov kev ntws ntawm cov tshuaj khib nyiab yuav raug txo qis, yog li qhov ntau ntawm cellulose ether HPMC yuav tsum tau tswj hwm hauv qhov ntau thiab tsawg tsim nyog.
2. Kev khaws dej: Kev khaws dej ntawm cov mortar yog ib qho cim qhia tseem ceeb los ntsuas qhov ruaj khov ntawm cov khoom sab hauv ntawm cov cement mortar tshiab. Yuav kom ua tiav qhov kev ua kom cov dej ntawm cov khoom gel, ib qho cellulose ether tsim nyog tuaj yeem tswj cov dej noo hauv cov mortar ntev. Feem ntau hais lus, qhov ceev ntawm kev khaws dej ntawm slurry nce nrog rau qhov nce ntawm cellulose ether cov ntsiab lus. Qhov cuam tshuam ntawm kev khaws dej ntawm cellulose ether HPMC tuaj yeem tiv thaiv cov substrate los ntawm kev nqus dej ntau dhau sai dhau, thiab cuam tshuam kev ua kom dej evaporation, yog li kom ntseeg tau tias qhov chaw slurry muab dej txaus rau cement hydration. Tsis tas li ntawd, qhov viscosity ntawm cellulose ether kuj muaj kev cuam tshuam loj rau kev khaws dej ntawm mortar. Qhov siab dua qhov viscosity, qhov zoo dua qhov khaws dej. Feem ntau, cellulose ether HPMC nrog viscosity ntawm 400mpa.s feem ntau yog siv rau hauv cov mortar tus kheej, uas tuaj yeem txhim kho qhov kev ua tau zoo ntawm cov mortar thiab ua kom cov mortar compactness.
3. Lub sijhawm teeb tsa: Cellulose ether muaj qee yam cuam tshuam rau cov mortar. Nrog rau kev nce ntxiv ntawm cov ntsiab lus ntawm cellulose ether, lub sijhawm teeb tsa ntawm cov mortar ntev dua. Cov nyhuv cuam tshuam ntawm cellulose ether HPMC ntawm cov cement paste feem ntau nyob ntawm qib ntawm kev hloov pauv ntawm pawg alkyl, thiab muaj kev sib raug zoo me ntsis nrog nws qhov hnyav molecular. Qhov me dua qib ntawm kev hloov pauv alkyl, qhov loj dua cov ntsiab lus hydroxyl, thiab qhov pom tseeb ntau dua qhov cuam tshuam cuam tshuam. Thiab qhov siab dua cov ntsiab lus ntawm cellulose ether, qhov pom tseeb ntau dua qhov cuam tshuam qeeb ntawm cov txheej zaj duab xis nyuaj rau cov dej noo thaum ntxov ntawm cement, yog li qhov cuam tshuam cuam tshuam kuj pom tseeb ntau dua.
4. Lub zog khoov thiab lub zog nias: Feem ntau, lub zog yog ib qho ntawm cov ntsuas tseem ceeb rau kev kho cov nyhuv ntawm cov cement-based cementitious cov ntaub ntawv ntawm qhov sib tov. Lub zog nias thiab lub zog nias ntawm mortar yuav txo qis nrog rau qhov nce ntawm cellulose ether HPMC cov ntsiab lus.
5. Lub zog sib txuas: cellulose ether HPMC muaj feem cuam tshuam loj heev rau kev ua haujlwm sib txuas ntawm cov mortar. Cellulose ether tsim cov zaj duab xis polymer nrog cov nyhuv sib khi ntawm cov cement hydration hauv cov kua theem system, uas txhawb nqa ntau dej hauv cov zaj duab xis polymer sab nraum cov cement, uas yog qhov zoo rau kev ua kom tiav ntawm cov cement, yog li txhim kho lub zog sib txuas ntawm cov nplaum tom qab tawv. Tib lub sijhawm, qhov ntau ntawm cellulose ether tsim nyog ua rau cov plasticity thiab kev ywj pheej ntawm cov mortar, txo qhov rigidity ntawm thaj chaw hloov pauv ntawm cov mortar thiab lub substrate interface, thiab txo qhov muaj peev xwm swb ntawm cov interfaces. Mus rau qee qhov, qhov cuam tshuam sib txuas ntawm cov mortar thiab lub substrate yog txhim kho. Tsis tas li ntawd, vim muaj cellulose ether hauv cov cement paste, ib qho tshwj xeeb interface hloov pauv cheeb tsam thiab interface txheej yog tsim ntawm cov mortar thiab cov khoom hydration. Cov interface txheej no ua rau interface hloov pauv cheeb tsam ntau dua thiab tsawg dua rigid, yog li ntawd cov mortar muaj lub zog sib txuas muaj zog.
Lub sijhawm tshaj tawm: Lub Ob Hlis-27-2023