HPMC (Hydroxypropyl methylcellulose)yog ib qho kev hloov kho cellulose dav siv hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv mortar. Raws li cov dej-soluble polymer compound, HPMC tuaj yeem tsis tsuas yog txhim kho kev tsim kho ntawm mortar, tab sis kuj tseem ua lub luag haujlwm tseem ceeb hauv cov impermeability ntawm mortar.
1. Cov khoom tseem ceeb ntawm HPMC thiab nws lub luag haujlwm hauv mortar
HPMC muaj dej solubility zoo thiab thickening zog. Nws tuaj yeem ua ke nrog dej los tsim cov kua nplaum los txhim kho kev ua haujlwm ntawm mortar. Lub luag haujlwm tseem ceeb ua los ntawm HPMC hauv mortar suav nrog:
Txhim kho cov dej tuav ntawm mortar: HPMC muaj cov dej tuav ruaj khov thiab tuaj yeem ua kom cov dej ntws tawm sai sai, yog li ua kom cov mortar moist. Qhov no yuav pab txhim kho kev tsim kho ntawm mortar, ua kom yooj yim rau kev khiav lag luam thaum lub sij hawm tsim kho, thiab yog qhov tsim nyog rau cov tshuaj tiv thaiv dej ntawm cov cement.
Txhim kho qhov adhesion thiab plasticity ntawm mortar: HPMC tuaj yeem txhim kho qhov adhesion ntawm mortar, txhim khu nws adhesion rau hauv paus txheej, thiab tsis txhob poob los yog tawg thaum lub sij hawm tsim kho. Tib lub sijhawm, HPMC tuaj yeem txhim kho cov yas ntawm mortar, ua kom nws yooj yim dua los kho nws cov duab thaum siv.
Txhim kho kev ua kom tawg: Vim HPMC tuaj yeem ua kom lub zog sib txuas thiab lub zog ntawm mortar, nws tuaj yeem txhim kho qhov tawg ntawm cov tshuaj khib rau qee yam thiab tiv thaiv cov kab nrib pleb los ntawm sab nraud los yog shrinkage.
2. Cov nyhuv ntawm HPMC rau qhov impermeability ntawm mortar
Lub impermeability ntawm mortar hais txog nws lub peev xwm los tiv thaiv dej nkag hauv dej siab. Lub impermeability ntawm mortar yog cuam tshuam los ntawm ntau yam, qhov tseem ceeb tshaj plaws yog cov qauv pore, ntom thiab hydration degree ntawm cement. HPMC txhim kho qhov impermeability ntawm mortar hauv cov hauv qab no:
Txhim kho microstructure ntawm mortar
Lub impermeability ntawm mortar yog ze ze rau nws cov microstructure. Muaj qee qhov kev faib ua feem ntawm qhov pores hauv mortar, uas yog cov channel tseem ceeb rau kev nkag mus rau dej. Qhov sib ntxiv ntawm HPMC tuaj yeem txo qhov porosity los ntawm kev tsim cov qauv zoo dua. Tshwj xeeb, HPMC tuaj yeem cuam tshuam nrog cov khoom siv cement hauv cov cement mortar, txhawb cov txheej txheem cement hydration, ua cov cement paste ntau dua, txo qhov tsim ntawm cov pores loj, thiab yog li txhim kho qhov ntom ntawm mortar. Vim qhov txo qhov pores, txoj kev ntawm dej nkag mus ntev dua, yog li txhim kho cov impermeability ntawm mortar.
Txhim kho cov dej tuav ntawm mortar thiab txhawb cov cement hydration
Cov tshuaj tiv thaiv hydration ntawm cov cement xav tau dej txaus los mus, thiab qhov ua tiav ntawm cov cement hydration ncaj qha cuam tshuam rau lub zog thiab impermeability ntawm mortar. HPMC tuaj yeem ua kom cov dej ntws qeeb qeeb los ntawm nws cov dej tuav, kom cov mortar muaj peev xwm tuav tau dej txaus thaum lub sij hawm tsim kho thiab txhawb nqa tag nrho cov dej ntawm cov cement. Thaum lub sij hawm cov cement hydration txheej txheem, ib tug loj npaum li cas ntawm cov khoom hydration yuav generated nyob rau hauv cov cement paste, uas ua rau lub hauv paus pores, ntxiv txhim kho qhov ntom ntawm cov mortar, thiab ces txhim kho nws impermeability.
Ua kom lub zog sib txuas ntawm mortar
HPMC tuaj yeem txhim kho qhov adhesion ntawm mortar thiab puag saum npoo los ntawm kev txhim kho lub zog ntawm cov tshuaj khib nyiab. Qhov no tuaj yeem zam cov dej seepage los ntawm mortar los yog tawg. Tshwj xeeb tshaj yog nyob rau hauv qee qhov chaw raug, txhim kho lub zog sib txuas tuaj yeem txo txoj kev nkag mus ntawm dej. Tsis tas li ntawd, kev txhim kho kev sib raug zoo ntawm HPMC kuj tseem tuaj yeem ua rau lub ntsej muag mortar smoother, ntxiv kom txo tau cov dej nkag.
Inhibit qhov tsim ntawm cov kab nrib pleb
Kev tsim cov kab nrib pleb yog ib qho tseem ceeb cuam tshuam rau impermeability ntawm mortar. Microcracks nyob rau hauv mortar yog lub ntsiab channel rau dej nkag. HPMC tuaj yeem txo qhov tsim ntawm cov kab nrib pleb los ntawm kev txhim kho cov ductility thiab tawg tsis kam ntawm mortar, thiab tiv thaiv cov dej nkag mus rau hauv mortar los ntawm cov kab nrib pleb. Thaum lub sij hawm tsim kho, HPMC tuaj yeem daws qhov teeb meem tawg tau zoo los ntawm kev hloov pauv kub lossis tsis sib haum ntawm lub hauv paus nto, yog li txhim kho cov impermeability ntawm mortar.
3. Daim ntawv thov ntawm HPMC nyob rau hauv txawv mortars
Ntau hom mortars muaj ntau qhov kev xav tau rau impermeability, thiab daim ntawv thov cuam tshuam ntawm HPMC hauv cov mortars kuj txawv. Piv txwv li:
Plaster mortar: Plaster mortar feem ntau yog siv los ua txheej txheej ntawm sab nrauv facade ntawm lub tsev, thiab nws cov kev cai impermeability yog qhov siab. Daim ntawv thov ntawm HPMC nyob rau hauv plaster mortar tuaj yeem txhim kho cov kab nrib pleb thiab impermeability ntawm mortar, tshwj xeeb tshaj yog nyob rau hauv high humidity ib puag ncig, HPMC tuaj yeem tiv thaiv kom tsis txhob ya raws thiab ua kom cov phab ntsa sab hauv ntawm lub tsev qhuav.
Waterproof mortar: Lub luag haujlwm tseem ceeb ntawm cov dej khib nyiab yog los tiv thaiv dej nkag, yog li nws cov kev cai impermeability yog tshwj xeeb tshaj yog nruj. HPMC tuaj yeem txhim kho qhov ntom ntom ntawm cov dej khib nyiab, ua kom cov dej ntws ntawm cov cement, thiab yog li txhim kho cov dej tsis zoo ntawm cov mortar.
Pem teb mortar: Pem teb mortar tej zaum yuav eroded los ntawm dej thaum lub sij hawm ntev siv, tshwj xeeb tshaj yog nyob rau hauv cov av noo. HPMC tuaj yeem txuas ntxiv lub neej kev pabcuam hauv pem teb los ntawm kev txhim kho lub impermeability ntawm mortar.
Raws li ib qho ntxiv, HPMC tuaj yeem txhim kho qhov impermeability ntawm mortar. Los ntawm kev txhim kho lub microstructure ntawm mortar, txhim kho nws cov dej tuav, txhim kho kev sib raug zoo, thiab txhim kho kev tawg,HPMCtuaj yeem ua rau mortar tsim ntau cov qauv compact, txo txoj kev nkag mus ntawm dej, thiab yog li txhim kho cov impermeability ntawm mortar. Hauv kev siv tswv yim, qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho kev tsim kho ntawm mortar thiab txuas ntxiv lub neej kev pabcuam ntawm cov tsev. Yog li ntawd, HPMC muaj dav daim ntawv thov kev cia siab nyob rau hauv ntau daim ntawv thov xws li waterproofing, plastering thiab pem teb mortar.
Post lub sij hawm: Jan-16-2025