Cov tshuaj mortar uas nws tus kheej leveling siv tau nws qhov hnyav los ua lub hauv paus tiaj tus, du thiab muaj zog rau ntawm lub substrate rau kev tso lossis sib txuas lwm yam khoom. Tib lub sijhawm, nws tuaj yeem ua tiav kev tsim kho loj thiab ua haujlwm tau zoo. Yog li ntawd, qhov dej ntws siab yog ib qho tseem ceeb heev ntawm cov tshuaj mortar uas nws tus kheej leveling. 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 muaj dej zoo, tab sis qhov dej ntawm cov cement paste feem ntau tsuas yog 10-12cm xwb; ntawmcov cellulose ethers, hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv tseem ceeb ntawm cov tshuaj mortar sib xyaw ua ke, txawm hais tias qhov ntxiv tsawg heev, nws tuaj yeem txhim kho kev ua tau zoo ntawm cov tshuaj mortar, nws tuaj yeem txhim kho qhov sib xws, kev ua haujlwm, kev sib txuas thiab kev ua kom dej ntawm cov tshuaj mortar. Nws ua lub luag haujlwm tseem ceeb heev hauv kev ua cov tshuaj mortar sib xyaw ua ke.
1. Kev txav mus los
Hydroxypropyl methylcellulose (HPMC)muaj feem cuam tshuam tseem ceeb rau kev khaws dej, kev sib xws thiab kev ua haujlwm ntawm cov tshuaj mortar uas tus kheej. Tshwj xeeb tshaj yog raws li cov tshuaj mortar uas tus kheej, kev ua kua yog ib qho ntawm cov cim 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 mortar, qhov ua kua ntawm cov tshuaj mortar tuaj yeem hloov kho los ntawm kev hloov pauv qhov ntau ntawm HPMC. Txawm li cas los xij, yog tias qhov koob tshuaj ntau dhau, qhov ua kua ntawm cov tshuaj mortar yuav raug txo qis, yog li qhov koob tshuaj ntawm HPMC yuav tsum tau tswj hwm hauv qhov ntau thiab tsawg tsim nyog.
2. Kev khaws dej
Qhov kev khaws dej ntawm cov mortar yog ib qho tseem ceeb uas 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, HPMC ntau txaus tuaj yeem tswj cov dej noo hauv cov mortar ntev. Feem ntau hais lus, qhov ceev ntawm cov dej slurry nce nrog qhov nce ntawm HPMC cov ntsiab lus. Lub luag haujlwm khaws dej ntawm 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 xyuas kom meej tias qhov chaw slurry muab dej txaus rau cement hydration. Tsis tas li ntawd, qhov viscosity ntawm hydroxypropyl methylcellulose kuj muaj kev cuam tshuam loj rau qhov kev khaws dej ntawm mortar. Qhov siab dua qhov viscosity, qhov zoo dua qhov kev khaws dej. Feem ntau, cov khoom nrog viscosity ntawm txog 400mpa.s feem ntau yog siv rau cov mortar tus kheej, uas tuaj yeem txhim kho qhov kev ua tau zoo ntawm cov mortar thiab ua kom cov mortar compactness.
3. Teem sijhawm
HPMC muaj qee yam cuam tshuam rau cov mortar. Nrog rau kev nce ntxiv ntawm cov tshuaj, lub sijhawm teeb tsa ntawm cov mortar yuav ntev dua. Qhov cuam tshuam ntawm HPMC ntawm cov cement paste feem ntau nyob ntawm qib ntawm kev hloov pauv ntawm cov pab pawg alkyl, thiab tsis muaj kev sib raug zoo nrog nws qhov hnyav molecular. Qhov me dua ntawm qib ntawm kev hloov pauv alkyl, qhov loj dua cov ntsiab lus hydroxyl, thiab qhov pom tseeb dua qhov cuam tshuam qeeb. Thiab qhov siab dua cov ntsiab lus HPMC, qhov pom tseeb ntau dua qhov cuam tshuam ntawm cov txheej zaj duab xis nyuaj rau kev ncua dej thaum ntxov ntawm cement, yog li qhov cuam tshuam qeeb kuj pom tseeb dua.
4. Lub zog flexural thiab lub zog compressive
Feem ntau, lub zog yog ib qho ntawm cov ntsuas kev ntsuam xyuas tseem ceeb rau qhov kho cov nyhuv ntawm cov cement-based cementitious cov khoom sib xyaw. Lub zog compressive thiab lub zog flexural ntawm mortar yuav txo qis nrog rau qhov nce ntawm HPMC cov ntsiab lus.
5. Lub zog sib txuas
HPMC muaj kev cuam tshuam loj heev rau kev ua haujlwm ntawm cov mortar.HPMCtsim cov zaj duab xis polymer nrog cov nyhuv sealing ntawm cov kua theem system thiab cov cement hydration particles, uas txhawb kom muaj dej ntau dua hauv cov zaj duab xis polymer sab nraum cov cement particles, uas yog qhov zoo rau kev ua kom tiav ntawm cov cement hydration, yog li txhim kho qhov zoo ntawm slurry. Lub zog sib khi khov kho. Tib lub sijhawm, ntxiv cov HPMC kom 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 kev sib txuas ntawm cov mortar thiab lub substrate tau txhim kho. Tsis tas li ntawd, vim muaj HPMC hauv cov cement paste, ib qho tshwj xeeb interface hloov pauv cheeb tsam thiab interface txheej tau tsim ntawm cov mortar particles thiab cov khoom hydration. Cov interface txheej no ua rau interface hloov pauv cheeb tsam ntau dua thiab tsawg dua rigid. Yog li ntawd, Mortar muaj lub zog sib txuas zoo.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024