HPMC (hydroxypropyl methylcellulose)yog ib qho cellulose hloov kho uas siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv cov mortar. Ua ib qho polymer compound uas yaj tau hauv dej, HPMC tsis yog tsuas yog txhim kho kev ua tau zoo ntawm cov mortar, tab sis kuj ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv ntawm cov mortar.
1. Cov khoom tseem ceeb ntawm HPMC thiab nws lub luag haujlwm hauv mortar
HPMC muaj cov khoom zoo solubility hauv dej thiab thickening. Nws tuaj yeem sib xyaw nrog dej los ua cov kua nplaum kom txhim kho kev ua haujlwm ntawm cov mortar. Lub luag haujlwm tseem ceeb uas HPMC ua hauv cov mortar suav nrog:
Txhim kho qhov khaws dej ntawm cov pob zeb mortar: HPMC muaj cov dej khaws cia zoo thiab tuaj yeem ua rau qeeb qeeb ntawm cov dej evaporation, yog li ua rau cov pob zeb mortar noo. Qhov no pab txhim kho kev ua haujlwm ntawm cov pob zeb mortar, ua rau nws yooj yim dua rau kev ua haujlwm thaum lub sijhawm tsim kho, thiab ua rau cov tshuaj tiv thaiv hydration ntawm cement.
Txhim kho qhov kev nplaum thiab kev yas ntawm cov mortar: HPMC tuaj yeem txhim kho qhov kev nplaum ntawm cov mortar, txhim kho nws qhov kev nplaum rau txheej hauv paus, thiab zam kev poob lossis tawg thaum lub sijhawm tsim kho. Tib lub sijhawm, HPMC tuaj yeem txhim kho qhov kev yas ntawm cov mortar, ua rau nws yooj yim dua los kho nws cov duab thaum lub sijhawm tsim kho.
Txhim kho qhov tsis kam ntawm kev tawg: Vim tias HPMC tuaj yeem ua rau lub zog sib txuas thiab kev tawv ntawm cov mortar, nws tuaj yeem txhim kho qhov tsis kam ntawm cov mortar mus rau qee qhov thiab tiv thaiv kev tawg los ntawm cov zog sab nraud lossis shrinkage.
2. Cov nyhuv ntawm HPMC rau qhov tsis muaj zog ntawm cov mortar
Qhov tsis muaj dej nkag ntawm cov mortar yog hais txog nws lub peev xwm los tiv taus dej nkag mus rau hauv qab dej siab. Qhov tsis muaj dej nkag ntawm cov mortar yog cuam tshuam los ntawm ntau yam, qhov tseem ceeb tshaj plaws yog cov qauv pore, qhov ceev thiab qib hydration ntawm cement. HPMC txhim kho qhov tsis muaj dej nkag ntawm cov mortar hauv cov hauv qab no:
Txhim kho cov qauv me me ntawm cov mortar
Qhov tsis muaj dej nkag ntawm cov mortar muaj feem cuam tshuam nrog nws cov qauv me me. Muaj qee qhov feem pua ntawm cov qhov hws hauv cov mortar, uas yog cov channel tseem ceeb rau dej nkag mus. Kev ntxiv HPMC tuaj yeem txo qhov porosity los ntawm kev tsim cov qauv zoo dua. Tshwj xeeb, HPMC tuaj yeem cuam tshuam nrog cov cement hauv cov cement mortar, txhawb cov txheej txheem cement hydration, ua rau cov cement nplaum ntau dua, txo qhov tsim ntawm cov qhov hws loj, thiab yog li txhim kho qhov ceev ntawm mortar. Vim yog qhov txo qis ntawm cov qhov hws, txoj kev nkag mus ntawm dej ntev dua, yog li txhim kho qhov tsis muaj dej nkag ntawm cov mortar.
Txhim kho qhov kev khaws cia dej ntawm cov mortar thiab txhawb kev ua kom cov cement noo
Qhov kev ua kom cov cement hydration xav tau dej txaus kom ua tiav, thiab qhov ua tiav ntawm cov cement hydration cuam tshuam ncaj qha rau lub zog thiab kev tsis tuaj yeem ntawm cov mortar. HPMC tuaj yeem ua rau qeeb qeeb ntawm kev ua kom cov dej evaporation los ntawm nws cov nyhuv khaws cia dej, yog li cov mortar tuaj yeem khaws cov dej txaus thaum lub sijhawm tsim kho thiab txhawb kom cov cement hydration tag nrho. Thaum lub sijhawm ua cov cement hydration, yuav muaj ntau cov khoom hydration hauv cov cement paste, uas ua rau cov qhov hws qub, txhim kho qhov ceev ntawm cov mortar, thiab tom qab ntawd txhim kho nws qhov tsis tuaj yeem.
Ua kom lub zog sib txuas ntawm cov mortar
HPMC tuaj yeem txhim kho qhov kev sib txuas ntawm cov mortar thiab qhov chaw hauv paus los ntawm kev txhim kho lub zog sib txuas ntawm cov mortar. Qhov no tuaj yeem tiv thaiv dej ntws los ntawm cov mortar poob lossis tawg. Tshwj xeeb tshaj yog nyob rau hauv qee qhov chaw raug nthuav tawm, kev txhim kho lub zog sib txuas tuaj yeem txo qhov kev nkag mus ntawm dej. Tsis tas li ntawd, kev sib txuas zoo dua ntawm HPMC kuj tseem tuaj yeem ua rau qhov chaw mortar du, txo qhov nkag mus ntawm dej.
Tiv thaiv kom tsis txhob muaj cov kab nrib pleb
Qhov kev tsim cov kab nrib pleb yog ib qho tseem ceeb uas cuam tshuam rau qhov tsis tuaj yeem nkag tau ntawm cov mortar. Cov kab nrib pleb me me hauv cov mortar yog cov channel tseem ceeb rau kev nkag mus rau hauv dej. HPMC tuaj yeem txo qhov kev tsim cov kab nrib pleb los ntawm kev txhim kho qhov ductility thiab kev tiv thaiv kab nrib pleb ntawm cov mortar, thiab tiv thaiv dej kom tsis txhob nkag mus rau hauv cov mortar los ntawm cov kab nrib pleb. Thaum lub sijhawm tsim kho, HPMC tuaj yeem daws qhov teeb meem kab nrib pleb uas tshwm sim los ntawm kev hloov pauv kub lossis kev sib tsoo tsis sib xws ntawm qhov chaw hauv paus, yog li txhim kho qhov tsis tuaj yeem nkag tau ntawm cov mortar.
3. Daim ntawv thov ntawm HPMC hauv cov mortars sib txawv
Cov hom mortars sib txawv muaj cov kev cai sib txawv rau kev tsis nkag, thiab cov nyhuv ntawm daim ntawv thov ntawm HPMC hauv cov mortars no kuj txawv. Piv txwv li:
Cov tshuaj nplaum plaster: Cov tshuaj nplaum plaster feem ntau yog siv ua txheej npog ntawm lub ntsej muag sab nraud ntawm lub tsev, thiab nws cov kev xav tau impermeability yog qhov siab heev. Daim ntawv thov ntawm HPMC hauv cov tshuaj nplaum plaster tuaj yeem txhim kho qhov tawg tsis kam thiab impermeability ntawm cov tshuaj nplaum, tshwj xeeb tshaj yog nyob rau hauv cov chaw noo noo siab, HPMC tuaj yeem tiv thaiv kev nkag mus rau hauv dej noo thiab ua kom cov phab ntsa sab hauv ntawm lub tsev qhuav.
Cov tshuaj nplaum uas tsis ntub dej: Lub luag haujlwm tseem ceeb ntawm cov tshuaj nplaum uas tsis ntub dej yog tiv thaiv kom tsis txhob muaj dej nkag mus, yog li nws cov kev cai tsis pub dej nkag mus yog qhov nruj heev. HPMC tuaj yeem txhim kho qhov ceev ntawm cov tshuaj nplaum uas tsis ntub dej, ua rau cov cement noo ntau ntxiv, thiab yog li ua kom cov tshuaj nplaum ua haujlwm tsis ntub dej zoo dua.
Cov tshuaj khib hauv pem teb: Cov tshuaj khib hauv pem teb yuav raug dej ntws thaum siv ntev, tshwj xeeb tshaj yog nyob rau hauv thaj chaw noo noo. HPMC tuaj yeem ua kom lub neej ua haujlwm ntawm cov tshuaj khib hauv pem teb ntev dua los ntawm kev txhim kho qhov tsis pub dej nkag ntawm cov tshuaj khib.
Ua ib qho khoom ntxiv, HPMC tuaj yeem txhim kho qhov tsis nkag ntawm cov mortar. Los ntawm kev txhim kho cov qauv ntawm cov mortar, txhim kho nws cov dej khaws cia, txhim kho lub zog sib txuas, thiab txhim kho kev tiv thaiv kab nrib pleb.HPMCtuaj yeem ua rau cov mortar ua rau muaj cov qauv me dua, txo qhov kev nkag mus ntawm dej, thiab yog li txhim kho qhov tsis nkag ntawm cov mortar. Hauv kev siv tiag tiag, kev ntxiv HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar thiab txuas ntxiv lub neej ua haujlwm ntawm cov tsev. Yog li ntawd, HPMC muaj kev cia siab dav dav hauv ntau yam kev siv xws li kev tiv thaiv dej, plastering thiab mortar hauv pem teb.
Lub sijhawm tshaj tawm: Lub Ib Hlis-16-2025