Hydroxypropyl MethylCellulose hauv kev txhim kho cov nyhuv cement

Hydroxypropyl MethylCellulose hauv kev txhim kho cov nyhuv cement

Hydroxypropyl Methyl Cellulose (HPMC), ua ib qho ntawm cov cellulose ethers uas yaj tau hauv dej tshaj plaws hauv lub tsev mortar system, ua lub luag haujlwm tseem ceeb hauv kev tswj kev ua haujlwm ntawm cov ntaub ntawv niaj hnub. Tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv cement-based, HPMC tau ua pov thawj tias muaj kev txhim kho zoo rau cov txheej txheem hydration, rheological properties, workability, physical thiab mechanical properties, thiab lwm yam. Nws cov qauv molecular tshwj xeeb thiab viscoelastic properties ntawm cov tshuaj ua rau nws yog ib qho tseem ceeb additive rau kev txhim kho kev tsim kho zoo thiab cov khoom ruaj khov.

1. Txhim kho kev khaws dej: Ncua kev ua kom dej noo thiab txhawb kom tawv sib xws

Qhov dej ntawm lub tshuab cement xav tau dej txaus. Txawm li cas los xij, cov cement mortar ib txwm muaj feem poob dej sai dhau thaum lub sijhawm tsim kho vim muaj cov yam ntxwv xws li kev nqus dej los ntawm cov khoom siv hauv paus, kev ua pa, thiab cua qhuav, uas cuam tshuam rau kev txhim kho lub zog thiab kev ua tau zoo tom qab.
HPMC tsim cov qauv network txuas ntxiv mus, ruaj khov encapsulating dej dawb hauv nws, zoo inhibiting dej poob thiab ua kom cov mortar noo txaus thaum lub sijhawm qhib, yog li ua rau muaj cov teebmeem txhim kho hauv qab no:
Maj mam ua kom cov dej pib ntws qeeb qeeb kom tsis txhob ua kom sai sai uas yuav ua rau muaj teeb meem hauv kev tsim kho.
Txhim kho qhov ua tiav ntawm cov cement hydration kom ntseeg tau tias cov cement me me teb tau zoo dua.
Nws tuaj yeem txhim kho qhov kev sib txuas ntawm cov interfacial, tshwj xeeb tshaj yog rau ntawm txheej puag nrog lub zog nqus dej (xws li aerated blocks), qhov cuam tshuam tseem ceeb dua.
Kev khaws cia dej zoo yog qhov tseem ceeb tshaj plaws thiab tseem ceeb tshaj plaws ntawm HPMC hauv cov kab ke cement.

2. Txhim kho cov khoom rheological thiab kev ua haujlwm tau zoo: Muab cov nyhuv thixotropic zoo tshaj plaws

Cov saw polymer ntawm HPMC tuaj yeem tsim cov kua nplaum sib xws hauv dej, ua rau cov mortar nrog cov khoom zoo tagnrho thixotropic thiab cov khoom khaws cia ntws. Nws cov nyhuv hauv kev txhim kho cov khoom rheological feem ntau pom hauv:
Txhim kho lubricity: Cov mortar ua du dua thaum lub sijhawm sib tov thiab troweling, txo cov cuab yeej tsis kam.
Txhim kho thixotropy: Nws muaj viscosity siab thaum so, tiv thaiv kev sagging. Thaum raug rau lub zog, qhov viscosity txo qis, ua rau nws yooj yim rau kev siv.
Txhim kho qhov kev twj tso kua mis: Txo cov yeeb nkab txhaws hauv kev siv tshuab txau thiab kev tsim kho twj tso kua mis kom txhim kho kev tsim kho kom zoo.
Qhov kev txhim kho ntawm cov khoom rheological ua rau cov neeg ua haujlwm tsim kho kom tswj tau qhov ruaj khov ntawm cov mortar rau lub sijhawm ntev dua, yog li ua rau qhov zoo ntawm cov khoom tiav zoo dua.

3. Tswj cov mortar stratification thiab los ntshav: Txhim kho qhov system ruaj khov

Cov cement mortar feem ntau ntsib teeb meem xws li los ntshav thiab sib cais vim qhov sib txawv ntawm qhov ceev ntawm dej thiab cov khoom khov, ua rau muaj zog tsis sib xws thiab cov qhov xuab zeb saum npoo av thiab lwm yam tsis zoo.
Qhov ua kom tuab ntawm HPMC tuaj yeem ua rau kom muaj viscosity ntawm lub kaw lus thiab txhim kho lub peev xwm ruaj khov ntawm kev ncua.
Cov khoom me me tsis yooj yim rau kev daws, thiab cov qauv mortar zoo ib yam.
Txo qhov los ntshav thiab zam kom tsis txhob muaj qhov poob qis ntawm kev nplaum los ntawm kev puas tsuaj ntawm cov dej zaj duab xis.
Txhim kho qhov kev ua tau zoo ntawm kev tawg thaum ntxov kom ua rau cov txheej txheem tawv tawv ruaj khov dua.
Qhov kev ruaj khov no yog qhov tseem ceeb heev rau cov khoom lag luam ua tau zoo xws li cov tshuaj mortar uas siv tau tus kheej, cov tshuaj plastering, thiab cov nplaum rau pobzeb.

4. Txhim kho lub zog sib txuas: Txhim kho kev ua tau zoo ntawm qhov interface

Lub peev xwm sib txuas ntawm cov cement mortar tsis yog los ntawm cov khoom hydration ntawm cement xwb, tab sis kuj nyob ntawm qhov interfacial wettability thiab cov khoom siv deformation muaj peev xwm. Kev ntxiv ntawm HPMC tuaj yeem txhim kho qhov cuam tshuam ntawm kev sib txuas. Cov laj thawj suav nrog:
Txhim kho qhov ntub dej ntawm cov slurry thiab txhim kho qhov nkag mus thiab lo rau ntawm cov mortar rau ntawm qhov chaw.
Tsim ib zaj duab xis organic uas yoog tau los muab ib qho me me ntawm kev them nyiaj rau lub cev tawv.
Txo cov kab nrib pleb thiab xyuas kom meej tias qhov sib txuas ntawm cov mortar thiab substrate muaj kev sib raug zoo.
Yog li ntawd, HPMC yog ib qho tseem ceeb rau kev txhim kho lub zog sib txuas ntawm cov ntaub ntawv xws li cov nplaum pobzeb, cov ntawv nplaum phab ntsa sab nraud, thiab cov neeg sawv cev sib txuas.

5. Txhim kho kev ruaj khov: Txhim kho kev ua haujlwm ntev ntawm cov khoom tiav

Raws li qhov sib xws ntawm theem tawv ntawm cov cement mortar zoo dua thiab cov microstructure ua denser, HPMC kuj tseem tuaj yeem coj cov txiaj ntsig txhim kho mus sij hawm ntev hauv cov hauv qab no:
Txo cov kab nrib pleb thaum ntxov → Txhim kho kev ruaj khov ntawm cov qauv
Txhim kho kev tiv thaiv khov-thaw thiab kev tiv thaiv huab cua → Txo kev yaig dej
Txo qhov nrawm ntawm carbonization → ncua cov txheej txheem laus
Kev ua tau ntev yog qhov ntsuas tseem ceeb rau cov txheej txheem mortar zoo, thiab lub luag haujlwm ntawm HPMC tsis yog tsuas yog cuam tshuam rau lub sijhawm tsim kho xwb tab sis kuj tseem pab txhawb rau kev ua tau zoo tom qab.

6. Kev ua tau zoo ntawm daim ntawv thov hauv cov ntaub ntawv cement ib txwm muaj

Cov nplaum rau pobzeb: Txhim kho kev nplaum, lub sijhawm qhib thiab kev ua haujlwm tiv thaiv kev plam.
Cov tshuaj nplaum plastering: Txhim kho kev ua haujlwm tau zoo, tiv taus kev tawg thiab kev du ntawm kev tsim kho.
Kev ua kom tiaj tus kheej raws li cov cement: Ua kom cov dej ntws ruaj khov thiab tiv thaiv kev sib cais.
Cov tshuaj nplaum rwb thaiv tsev kub: Txhim kho kev khaws dej thiab ua kom muaj peev xwm tiv thaiv kev txhaws ntawm lub rooj tsavxwm.
Cov khoom siv grouting: Txo cov ntshav thiab txhim kho qhov sib xws ntawm cov slurry.
Yuav luag txhua lub tshuab ua los ntawm cov cement-based dry-mixed mortar, lub luag haujlwm ua kom zoo dua ntawm HPMC yog qhov tseem ceeb.

HPMCtxhim kho qhov kev ua tau zoo ntawm kev tsim kho, kev ruaj khov ntawm cov qauv thiab kev ua haujlwm ntev ntawm cov cement hauv cov ntaub ntawv cement los ntawm cov txheej txheem xws li kev khaws dej, thickening, thixotropic kev tswj hwm thiab kev txhim kho interface. Nrog rau kev txhim kho cov ntaub ntawv tsim kho niaj hnub mus rau kev ua tau zoo siab thiab kev sib xyaw ua ntej, tus nqi thov ntawm HPMC yuav nce ntxiv, ua rau nws yog qhov hloov kho tseem ceeb rau cov ntaub ntawv cement.