HPMC cuam tshuam li cas rau lub zog ntawm mortar?

1. Txheej txheem cej luam ntawm HPMC

Hydroxypropyl methylcellulose (HPMC)yog ib qho cellulose ether uas tsis yog ionic feem ntau siv los ua cov khoom ua kom dej khaws cia thiab ua kom zoo dua hauv cov mortar. Hauv cov txheej txheem mortar, nws tsis yog tsuas yog kho qhov rheology thiab lub sijhawm ua haujlwm xwb tab sis kuj cuam tshuam ncaj qha lossis tsis ncaj qha rau lub zog ntawm cov mortar uas tau khov. Cov nyhuv no muaj feem cuam tshuam nrog HPMC koob tshuaj, qib ntawm kev hloov pauv, viscosity, formulation, thiab cov xwm txheej ua haujlwm.

2. Qhov Zoo ntawm HPMC rau Lub Zog Mortar

2.1. Txhim Kho Kev Ua Haujlwm Zoo ntawm Cement Hydration
HPMC cov khoom muaj zog khaws dej kom txo tau qhov poob dej thaum lub sijhawm tsim cov mortar, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias, cua hlob, lossis cov khoom siv nqus dej. Qhov no ua kom muaj dej noo tag nrho ntawm cov cement. Kev noo tag nrho ua rau muaj cov khoom noo noo ntau dua (xws li CSH gel) hauv cov mortar, uas pab txhim kho ob qho tib si thaum ntxov thiab tom qab lub zog.

2.2. Txo kev sib cais thiab kev los ntshav
Kev faib tawm tsis sib xws ntawm cov cement thiab cov pob zeb hauv cov mortar tuaj yeem ua rau cov cheeb tsam tsis muaj zog tom qab ua kom tawv. HPMC ua rau lub cev viscosity nce ntxiv, txo cov pob zeb sib xyaw thiab kev nqus dej, yog li txhim kho kev sib xws ntawm cov qauv thiab txhim kho lub zog ntawm cov qauv.

2.3. Kev Txhim Kho Kev Sib Txuas Lus Interfacial
Thaum lub sijhawm ua kom dej noo, HPMC tsim cov zaj duab xis polymer uas sib faib ua ke, uas cuam tshuam nrog cov khoom ua kom dej noo ntawm cov cement kom txhim kho kev sib txuas ntawm cov mortar thiab cov substrate. Qhov no tsis yog tsuas yog txhim kho lub zog sib txuas xwb tab sis kuj txhim kho lub zog compressive tag nrho.

2.4. Txo Qhov Kev Pheej Hmoo ntawm Kev Ntsws Ntsws
Los ntawm kev khaws dej thiab maj mam tso tawm cua sov ntawm cov dej noo, HPMC tuaj yeem txo qhov tawg ua ntej lub sijhawm hauv cov mortar, ua kom muaj kev faib tawm ntawm kev ntxhov siab sib npaug thiab zam kev ntxhov siab hauv zos uas tuaj yeem ua rau poob zog.

3. Tej Yam Tsis Zoo ntawm HPMC rau Lub Zog ntawm Mortar

3.1. Siv ntau dhau ua rau lub zog poob qis
HPMC yog ib qho organic polymer thiab tsis koom nrog hauv cov tshuaj tiv thaiv cement hydration. Yog tias ntxiv ntau dhau, nws tuaj yeem tsim cov organic theem loj hauv cov mortar khov kho, txo qhov ceev ntawm cov inorganic binder thiab ua rau lub zog compressive txo qis.

3.2. Kev ncua qhov nrawm ntawm cov dej noo ntawm cov cement
HPMC qhov kev nqus dej tuaj yeem npog qhov chaw ntawm cov cement, cuam tshuam kev sib kis dej thiab ncua qhov kev cuam tshuam ntawm cov dej. Qhov cuam tshuam no ua rau qeeb qeeb kev loj hlob ntawm lub zog thaum ntxov. Txawm hais tias nws tuaj yeem rov qab kho dua ib nrab tom qab, nws tsis zoo rau cov ntawv thov uas xav tau lub zog sai (xws li cov tshuaj kho sai).

3.3. Cov nyhuv ntawm cua nkag
Qee cov HPMCs uas muaj viscosity siab feem ntau yuav ua rau muaj cov npuas me me thaum lub sijhawm sib tov, ua rau cov pa hauv cov mortar nce ntxiv. Yog tias cov npuas no tsis raug rhuav tshem, lawv tsim cov qhov hws tom qab ua kom tawv, txo qhov muaj zog compressive.

4. Cov Yam Tseem Ceeb Uas Cuam Tshuam Rau Qhov Kev Haus Dej Ntau Npaum Li Cas

4.1. HPMC Qib ntawm Kev Hloov Chaw thiab Viscosity
Cov qib siab dua ntawm kev hloov pauv thiab cov viscosities siab dua ntawm HPMC muaj cov dej khaws cia zoo dua, tab sis kuj tseem muaj cov teebmeem ntawm kev ua kom dej tsis txaus thiab cov pa nkag.
Cov hom viscosity qis muaj qhov cuam tshuam tsawg dua rau kev ntws thiab kev ua haujlwm tau zoo, thiab qhov kev pheej hmoo ntawm kev poob zog qis dua.

4.2. Kev Tswj Xyuas Kev Noj Tshuaj
Cov koob tshuaj HPMC ib txwm muaj nyob rau hauv cov txheej txheem sib xyaw qhuav yog 0.1% txog 0.3% ntawm qhov hnyav ntawm cov khoom siv cementitious. Tshaj qhov ntau no tuaj yeem ua rau lub zog txo qis.

4.3. Lub Txheej Txheem Tsim Tshuaj
Thaum muaj cov hmoov polymer redispersible (RDP), qhov cuam tshuam synergistic ntawm HPMC thiab RDP tuaj yeem txhim kho qhov yooj ywm thiab lo, thiab muaj qhov cuam tshuam zoo rau lub zog flexural.
Hauv cov txheej txheem sib xyaw ua ke uas tsis hnyav lossis muaj qhov porous, HPMC qhov kev khaws cia dej tseem ceeb dua, ua rau qeeb qeeb ntawm kev poob zog.

4.4. Kev Tsim Kho thiab Kev Kho Kom Zoo
HPMC qhov zoo rau lub zog yog qhov pom tseeb dua thaum muaj qhov kub thiab txias, av noo tsawg, lossis cua hlob. Ntawm qhov tod tes, thaum cov av noo thiab thaum cov khoom siv tsis nqus tau, nws qhov zoo dua ntawm kev khaws dej tsis pom tseeb, thiab kev siv ntau dhau kuj tseem yuav cuam tshuam tsis zoo rau lub zog.

5. Cov Lus Qhia Txog Kev Txhim Kho

5.1. Kev Tswj Xyuas Kev Siv Tshuaj Kom Raug
Thaum ua kom ntseeg tau tias ua haujlwm tau zoo, siv cov tshuaj tsawg tshaj plaws kom tsis txhob muaj cov organic ntau dhau uas tuaj yeem txo qhov muaj zog.

5.2. Siv nrog cov tshuaj ua npuas dej
Txhawm rau daws cov teeb meem huab cua nkag nrog HPMC uas muaj viscosity siab, ntxiv cov tshuaj defoamer kom tsim nyog kom txo cov npuas cua thiab porosity.

5.3. Siv ua ke nrog lwm cov khoom ntxiv
Ua ke nrog cov hmoov polymer uas tau tawg ua dua tshiab, lignin sulfonates, thiab lwm yam khoom ntxiv, nws tuaj yeem txhim kho lub zog thiab kev ruaj khov thaum tseem tswj tau kev ua haujlwm.

5.4. Kho Cov Qauv rau Daim Ntawv Thov
Rau cov nplaum rau pobzeb thiab cov plaster mortars, qhov tseem ceeb tshaj plaws yog lub zog sib txuas thiab kev ua haujlwm tau zoo, thaum lub zog compressive tuaj yeem raug txo qis rau qee qhov.
Rau cov tshuaj kho cov qauv, cov koob tshuaj HPMC yuav tsum tau txo kom tswj tau lub zog thaum ntxov.

HPMC muaj ob qho kev cuam tshuam rau lub zog ntawm cov mortar: kev siv tshuaj kom raug thiab qib kom raug tuaj yeem ua rau kom cov qauv ntom ntom thiab ruaj khov ntawm cov tshuaj mortar, thaum kev siv tshuaj ntau dhau lossis qib tsis raug tuaj yeem txo qhov muaj zog. Kev xaiv kev tshawb fawb thiab kev tswj hwm cov tshuaj yog qhov tseem ceeb rau kev siv cov txiaj ntsig ntawm HPMC thaum zam nws cov teebmeem tsis zoo.