Hemsc (Hydroxyethyl Methyl Cellulose) yog cov dej-soluble polymer cov khoom siv tau siv hauv cov khoom siv hauv tsev. Nws tsuas yog lub luag haujlwm hauv kev txhim kho fluidity ntawm cov ntxhib muab tshuaj pleev thiab ncua cov cement ntawm cov tshuaj tiv thaiv. Nyob rau hauv cov txheej txheem hydration ntawm Maas, Hemc muaj qee yam cuam tshuam rau ntawm kev ua haujlwm ntawm cov dej cawv thiab ua haujlwm ntawm cov cement.
1. Cov khoom yooj yim ntawm HEMC
HEMC yog cov polymer tsim los ntawm kev hloov tshuaj lom neeg ntawm cov cellulose ntuj. Nws cov qauv molecular muaj ob qho chaw hloov, hydroxyethyl thiab methyl, uas ua rau nws muaj solubility hloov tau muaj peev xwm thiab zaj duab xis hloov khoom. Raws li ib tug admixture ntawm Maas, Hemc tuaj yeem txhim kho nws cov tshuaj tua kab, thiab tuaj yeem txhim kho lub zog thiab lub zog tom qab ua kom tawv nqaij tawv.
2. Cov nyhuv ntawm HEMC ntawm Caas Illation txheej txheem
Mash hydration yog cov txheej txheem ntawm cov xis thiab dej siv. Los ntawm cov tshuaj tiv thaiv no, cov cement muab maj mam ua kom muaj kev ua kom zoo nkauj matrix. Raws li admixture, hemc tuaj yeem ua si ntau lub luag haujlwm hauv cov txheej txheem cement. Cov teebmeem tshwj xeeb yog raws li hauv qab no:
2.1 txhim kho cov fluidity ntawm Maas slurry
Nyob rau hauv thaum ntxov theem ntawm cement dej, lub fluidity ntawm Maas Slurry tsis zoo, uas yuav raug cuam tshuam thaum kev tsim kho. HEMC tuaj yeem txhim kho cov fluidity ntawm Maas slurry vim nws cov viscosity siab thiab cov dej ua kom zoo. Nws disperses Caas hais thiab txo cov kev sib sau ua ke ntawm cov pajas slurry, ua rau nws ua haujlwm yooj yim rau kev ua haujlwm thiab hliv thaum lub sijhawm kev tsim kho.
2.2 Kev ncua cov khoom siv ntawm txoj kev ntxhib
Cov pab pawg hydroxyethyl hauv HEMC muaj muaj zog hydrophilicity. Nws tuaj yeem tsim cov yeeb yaj kiab hydration nyob rau saum npoo ntawm Maas hais tawm, qeeb qeeb ntawm kev sib cuag ntawm Caas thiab dej qeeb ntawm cov txheej txheem hydration ntawm cov cement. Qhov kev ncua qeeb no yog qhov tseem ceeb rau qhov kub lossis nrawm. Nws tuaj yeem tiv thaiv kev ua lub zog tsis sib xws tshwm sim los ntawm kev haus dej ntau dhau ntawm cov cement, thiab tuaj yeem txuas ntxiv rau cov teeb meem qhuav thaum ntxov.
2.3 txhim kho qhov ruaj khov ntawm xis mas slurry
Thaum lub sij hawm cov txheej txheem hydration ntawm Maas slurry, hemc tuaj yeem txhim kho kev ruaj ntseg ntawm cov slurry. Lub hydroxyethyl thiab methyl pawg nyob rau hauv HEMC lwg me me tuaj yeem sib cuam tshuam nrog cov cai maj mam los ntawm kev ua kom haum hydrogen thiab van der waals cov qauv tsim qauv. Qhov kev ruaj khov no pab tiv thaiv kom txhob muaj cov tshuaj xis mas txhim kho cov kev sib txuam ntawm cov cement ntawm cov txheej txheem cement.
2.4 Txhim kho lub microstructure ntawm cov khoom noj ntawm dej khov
HEMC tuaj yeem txhim kho cov microstructure ntawm cov hmoov av haas cov khoom siv los ntawm kev kho kom zoo nkauj thiab viscosity ntawm cov cement muab tshuaj txhuam. Piv txwv li, nyob rau hauv theem tom qab ntawm coaszent dej, xws li hydrated calcium silicate (CSH) gel. Thaum lub sij hawm cov txheej txheem cement heasing, tsim cov CSh Gel yog qhov tseem ceeb ntawm kev txiav txim siab lub zog thiab cov khoom noj kom haum. HEMC tuaj yeem txhawb cov kev faib tawm ntawm CSH gel thiab lub zog ntawm txoj kev hloov kho ion concentration.
2.5 Cov nyhuv ntawm lub zog cement
Cov nyhuv ntawm HEMC ntawm lub zog xis mas muaj feem cuam tshuam nrog cov txheej txheem xis mas. Nyob rau hauv thaum ntxov theem ntawm cement hydration, lub zog thaum ntxov ntawm txoj kev ntseeg yuav raug txo me ntsis vim yog cov nyhuv remc. Txawm li cas los xij, raws li cov cement co dej tshuaj tiv thaiv kab mob denser, yog li txhim kho lub zog ntawm lub zog thaum lub sijhawm kho lub sijhawm ntev. Ib qho ntxiv, hemc tuaj yeem txhim kho qhov tawg tsis kam ntawm Caas, txhim kho cov impermability ntawm MAAs qauv, thiab txhim kho kev ua kom xis mas.
3. Lwm yam kev cuam tshuam ntawm HEMC ntawm Maas
Ntxiv nrog rau cov teebmeem saum toj no-hais txog cov txheej txheem casas dej xis, hemc tseem muaj qee cov khoom ntawm lwm yam ntawm cov cement, feem ntau yog suav nrog:
3.1 Txhim kho cov nplooj khov tshaj thiab impermabeaberility ntawm xis mas
HEMC tuaj yeem txhim kho lub microstructure ntawm xis mas, yog li nws tuaj yeem tsim kom muaj kev kub ntxhov thiab cov txheej txheem hydration. Qhov qauv tuab no tuaj yeem txo cov porosity hauv cov cement, yog li txhim kho cov nplooj ntoos hlav tsis kam thiab customerability ntawm xis mas. Nyob rau hauv huab cua huab cua huab cua, lub frommant tsis kam thiab impermabability ntawm cov qauv cement yog qhov tseem ceeb rau lub tsev ntev ruaj khov ntawm cov tuam tsev.
3.2 Txhim kho txoj kev xeb tsis kam ntawm cov cement
Txij li HEMC txhim kho lub ntom ntom ntawm cov cement paste, nws tuaj yeem ua kom tau zoo txo cov dej xis, roj av, thiab yog li txhim kho lub corrosion tsis kam ntawm cement. Muaj feem ntau hauv qee cov av noo lossis cov acid noo, hemc tuaj yeem pab ua haujlwm rau lub neej ntawm cov kev ua kom xis mas.
4. Tus nqi thiab cov nyhuv ntawm HEMC
Cov nyhuv ntawm tus nqi ntawm HEMC ntawm cov txheej txheem Maas tau yog qhov tseem ceeb. Feem ntau hais lus, tus nqi ntawm HEMC ntxiv yuav tsum tau hloov kho raws li kev xav tau tiag tiag. Ntau dhau Hemc yuav ua rau cov cement slurry kom muaj kev sib zog thiab cuam tshuam kev ua haujlwm; Thaum tsis txaus ntxiv yuav tsis ua tiav nws lub luag haujlwm hauv kev txhim kho kev ua yeeb yam ntawm cov cement. Feem ntau, tus nqi ntawm HEMC ntxiv rau Caas yog 0.2% rau 1.0% (los ntawm Masas Mine), thiab cov nyiaj feem ntau siv yuav tsum tau txiav txim siab raws li txoj kev cai nyem ntau ntxiv thiab siv ib puag ncig.
Raws li cov Maas Adsays yog lub luag haujlwm tseem ceeb hauv kev txhim kho fluidity ntawm Measy cov txheej txheem, thiab txhim kho microstructure thiab lub zog ntawm cov cement. Kev siv HEMC tsim nyog tuaj yeem txhim kho kev ua tau zoo ntawm cov cement rau qee qhov, tshwj xeeb yog kev txhim kho lub sijhawm ua haujlwm, thiab txhim kho lub zog thiab ua rau muaj kev ruaj khov ntawm cov xis. Txawm li cas los xij, tus nqi ntawm HEMC siv yuav tsum tau hloov kho raws li cov xwm txheej tiag tiag los xyuas kom meej nws cov kev ua tau zoo. Hauv kev tsim kho cov dej num, daim ntawv thov ntawm HEMC yuav pab txhim kho cov khoom lag luam zoo thiab ruaj khov ntawm cov khoom.
Lub sijhawm Post: Feb-15-2025