Lub sijhawm teeb tsa ntawm cov pob zeb yog qhov tseem ceeb uas cuam tshuam rau kev tsim kho kom zoo thiab kev vam meej. Yog tias lub sijhawm teem sijhawm ntev dhau lawm, nws yuav ua rau kev txhim kho qeeb thiab ua rau cov pob zeb ua kom zoo; yog tias lub sijhawm teem sijhawm luv dhau, nws yuav ua rau muaj teeb meem hauv kev tsim vaj tsev thiab cuam tshuam rau kev tsim kho ntawm qhov project. Txhawm rau kho lub sijhawm teeb tsa ntawm pob zeb, kev siv cov khoom sib xyaw ua ke tau dhau los ua ib txoj hauv kev niaj hnub pob zeb ntau lawm.Hydroxyethyl Methyl Cellulose (HEMC), raws li ib qho kev hloov kho cellulose derivative, yog dav siv nyob rau hauv qhob admixtures thiab tuaj yeem cuam tshuam rau rheology, dej tuav, teem sij hawm thiab lwm yam khoom ntawm pob zeb.1. Cov khoom tseem ceeb ntawm HEMC
HEMC yog hloov kho cellulose, feem ntau yog tsim los ntawm ntuj cellulose los ntawm ethylation thiab methylation tshuaj. Nws muaj cov dej zoo solubility, thickening, dej tuav thiab gelling zog, yog li nws yog dav siv nyob rau hauv kev tsim kho, coatings, tshuaj txhua hnub thiab lwm yam teb. Hauv cov pob zeb, HEMC feem ntau yog siv los ua cov thickener, dej tuav tus neeg saib xyuas thiab tus neeg saib xyuas rheology, uas tuaj yeem txhim kho kev ua haujlwm ntawm pob zeb, nce adhesion thiab ncua sij hawm teem sijhawm.
2. Qhov cuam tshuam ntawm HEMC ntawm lub sijhawm teeb tsa ntawm pob zeb
ncua sij hawm teem caij
Raws li cov cellulose derivative, HEMC muaj ntau pawg hydrophilic hauv nws cov qauv molecular, uas tuaj yeem cuam tshuam nrog cov dej molecules los tsim cov dej ruaj khov, yog li ncua cov txheej txheem cement hydration rau qee yam. Cov tshuaj tiv thaiv hydration ntawm cov cement yog lub hauv paus ntsiab lus ntawm kev sib koom ua ke, thiab qhov sib ntxiv ntawm HEMC tuaj yeem cuam tshuam rau lub sijhawm teeb tsa los ntawm cov hauv qab no:
Txhim kho cov dej tuav: HEMC tuaj yeem txhim kho cov dej tuav ntawm cov pob zeb, ua kom cov dej ntws qeeb qeeb, thiab ua kom lub sij hawm ntev ntawm cov cement hydration cov tshuaj tiv thaiv. Los ntawm kev tuav dej, HEMC tuaj yeem zam dhau qhov dej poob, yog li ncua qhov tshwm sim ntawm qhov pib thiab qhov kawg.
Txo cov dej kub: HEMC tuaj yeem cuam tshuam kev sib tsoo thiab dej tshuaj tiv thaiv ntawm cov cement hais los ntawm kev ua kom cov viscosity ntawm cov pob zeb thiab txo cov kev txav ceev ntawm cov cement hais. Qhov qis hydration npaum li cas yuav pab ncua lub sij hawm teem ntawm pob zeb.
Kev hloov kho Rheological: HEMC tuaj yeem kho cov khoom rheological ntawm cov pob zeb, ua kom nws cov viscosity, thiab ua kom cov pob zeb ua kom zoo hauv cov dej ntws zoo thaum ntxov, zam kev tsim teeb meem los ntawm kev coagulation ntau dhau.
Kev cuam tshuam
Cov nyhuv ntawmHEMCntawm lub sijhawm teem tsis yog tsuas yog cuam tshuam nrog nws cov koob tshuaj, tab sis kuj cuam tshuam los ntawm lwm yam sab nraud:
Molecular hnyav thiab degree ntawm kev hloov ntawm HEMC: Qhov hnyav molecular thiab degree ntawm kev hloov pauv (qhov kev hloov ntawm ethyl thiab methyl) ntawm HEMC muaj kev cuam tshuam zoo rau nws qhov kev ua tau zoo. HEMC nrog qhov hnyav dua molecular thiab qib siab dua ntawm kev hloov pauv feem ntau tuaj yeem tsim cov qauv sib txuas kom muaj zog dua, qhia cov dej tuav tau zoo dua thiab cov khoom ua kom tuab, yog li qhov cuam tshuam ntawm lub sijhawm teem sijhawm tseem ceeb dua.
Hom cement: Ntau hom cement muaj qhov sib txawv hydration, yog li cov nyhuv ntawm HEMC ntawm cov cement sib txawv kuj txawv. Ordinary Portland cement muaj qhov dej nrawm dua, thaum qee cov cement qis lossis cov cement tshwj xeeb muaj cov dej qis dua, thiab lub luag haujlwm ntawm HEMC hauv cov tshuab no kuj tseem ceeb dua.
Ib puag ncig tej yam kev mob: Ib puag ncig tej yam kev mob xws li kub thiab av noo muaj ib qho tseem ceeb cuam tshuam rau lub sij hawm teem ntawm pob zeb. Qhov kub siab dua yuav ua rau kom cov tshuaj tiv thaiv dej ntawm cov cement, ua rau lub sij hawm luv luv, thiab cov nyhuv ntawm HEMC nyob rau hauv qhov kub thiab txias tej zaum yuav tsis muaj zog. Ntawm qhov tsis sib xws, nyob rau hauv qhov kub thiab txias ib puag ncig, qhov cuam tshuam qeeb ntawm HEMC yuav pom tseeb dua.
Concentration ntawm HEMC: Qhov concentration ntawm HEMC ncaj qha txiav txim siab txog qib ntawm nws cov kev cuam tshuam ntawm pob zeb. Qhov siab dua ntawm HEMC tuaj yeem ua rau kom cov dej tuav tau zoo thiab rheology ntawm cov pob zeb, yog li ua kom lub sijhawm teem sijhawm, tab sis HEMC ntau dhau yuav ua rau cov dej tsis zoo ntawm cov pob zeb thiab cuam tshuam rau kev tsim kho.
Synergistic nyhuv ntawm HEMC nrog rau lwm yam admixtures
HEMC feem ntau yog siv nrog lwm cov khoom sib xyaw (xws li dej reducers, retarders, thiab lwm yam) los kho qhov kev ua tau zoo ntawm pob zeb. Nrog rau kev koom tes ntawm cov neeg retarders, qhov teeb tsa ncua sij hawm ntawm HEMC tuaj yeem txhim kho ntxiv. Piv txwv li, cov nyhuv synergistic ntawm qee cov retarders xws li phosphates thiab qab zib admixtures nrog HEMC tuaj yeem txuas ntxiv lub sijhawm teem ntawm pob zeb, uas yog tsim rau cov haujlwm tshwj xeeb hauv cov huab cua kub lossis xav tau lub sijhawm siv ntev.
3. Lwm yam teebmeem ntawm HEMC ntawm cov khoom vaj khoom tsev
Ntxiv nrog rau kev ncua sij hawm teem sijhawm, HEMC tseem muaj qhov cuam tshuam tseem ceeb rau lwm yam khoom ntawm pob zeb. Piv txwv li, HEMC tuaj yeem txhim kho qhov fluidity, tiv thaiv kev sib cais, kev ua haujlwm ntawm kev ua haujlwm thiab kev ua haujlwm ntawm cov pob zeb. Thaum kho lub sijhawm teeb tsa, qhov tuab thiab dej tuav cov teebmeem ntawm HEMC tuaj yeem tiv thaiv kev sib cais lossis los ntshav ntawm cov pob zeb, thiab txhim kho tag nrho qhov zoo thiab ruaj khov ntawm pob zeb.
Hydroxyethyl methylcellulose (HEMC) tuaj yeem ncua sijhawm teem sijhawm ntawm pob zeb los ntawm nws cov dej tuav tau zoo, thickening thiab rheological tswj cov teebmeem. Qib ntawm kev cuam tshuam ntawm HEMC cuam tshuam los ntawm cov khoom xws li nws qhov hnyav molecular, qib kev hloov pauv, hom cement, kev sib xyaw ua ke thiab ib puag ncig. Los ntawm kev tswj hwm qhov ntau npaum li cas thiab feem ntawm HEMC, lub sijhawm teem sijhawm tuaj yeem txuas ntxiv tau zoo thaum ua kom muaj kev tsim kho ntawm pob zeb ua haujlwm, thiab kev ua haujlwm thiab kev ua haujlwm ntawm cov pob zeb tuaj yeem txhim kho. Txawm li cas los xij, kev siv HEMC ntau dhau kuj tuaj yeem ua rau muaj qhov tsis zoo, xws li dej tsis zoo lossis dej tsis tiav, yog li nws yuav tsum tau siv ceev faj raws li qhov xav tau ntawm engineering.
Post lub sij hawm: Nov-21-2024