Qhov Kev Txhim Kho Cov nyhuv ntawmHydroxypropyl Methylcellulosentawm Cement-Based Materials
Cement-raws li cov ntaub ntawv, xws li mortar thiab pob zeb, yog siv dav hauv kev tsim kho kev lag luam. Cov ntaub ntawv no muab cov txheej txheem muaj zog thiab ua haujlwm ntev rau cov tsev, txuas hniav, thiab lwm yam kev tsim vaj tsev. Txawm li cas los xij, muaj ntau yam kev sib tw muaj nyob hauv lawv daim ntawv thov, suav nrog kev tawg, shrinkage, thiab kev ua haujlwm tsis zoo. Txhawm rau daws cov teeb meem no, cov kws tshawb fawb tau tshawb xyuas kev siv qee yam tshuaj ntxiv xws liHydroxypropyl methylcellulose (HPMC). Hauv tsab xov xwm no, peb yuav tshawb xyuas qhov kev txhim kho ntawm HPMC ntawm cov khoom siv cement.
Hydroxypropyl methylcellulose (HPMC) yog cov cellulose-raws li polymer uas feem ntau siv los ua cov thickener, binder, thiab film-forming agent nyob rau hauv ntau yam lag luam. Hauv kev tsim kho kev lag luam, HPMC feem ntau yog siv los ua cov cement admixture los txhim kho kev ua haujlwm ntawm cov khoom siv cement. Nws paub txog nws cov khoom tshwj xeeb uas tuaj yeem txhim kho tag nrho qhov zoo thiab ua haujlwm ntev ntawm cov ntaub ntawv no.
Ib qho txiaj ntsig tseem ceeb ntawm HPMC yog nws lub peev xwm los txhim kho kev ua haujlwm ntawm cov khoom siv cement. HPMC ua raws li tus neeg saib xyuas dej, uas txhais tau hais tias nws tuaj yeem txo qhov evaporation ntawm cov dej los ntawm qhov sib tov. Qhov no ua rau ncua sij hawm teem sijhawm thiab txhim kho kev ua haujlwm, tso cai rau kev siv yooj yim dua thiab ua tiav cov khoom zoo dua. Tsis tas li ntawd, HPMC pab txo qhov kev pheej hmoo ntawm kev tawg thiab ntsws, vim nws muab cov txheej txheem hydration ntau dua.
Tsis tas li ntawd, HPMC tuaj yeem txhim kho kev sib koom ua ke ntawm cov cement particles thiab lwm yam sib sau ua ke. Qhov sib ntxiv ntawm HPMC rau cov ntaub ntawv cement-based tsim ib qho kev sib txuas ntawm peb sab, uas txhim kho cov nplaum nplaum. Qhov no ua rau muaj zog tensile thiab flexural zog, nrog rau kev txhim kho durability nyob rau hauv cov nqe lus ntawm tsis kam mus tshuaj tua kab mob thiab huab cua.
Kev siv HPMC kuj pab txo qis kev siv dej hauv cov khoom siv cement. Raws li tau hais ua ntej lawm, HPMC ua raws li cov dej khaws cia, tso cai rau tus nqi qis dua evaporation. Qhov no txhais tau hais tias yuav tsum muaj dej tsawg dua thaum lub sij hawm sib tov, ua rau cov dej qis-rau-cement piv. Cov ntsiab lus ntawm cov dej txo qis tsis tsuas yog txhim kho lub zog thiab ua haujlwm ntev ntawm cov khoom kawg nkaus xwb tab sis kuj txo qis tag nrho cov pa roj carbon hneev taw ntawm kev tsim kho kev lag luam.
Ntxiv nrog rau nws txoj kev ua haujlwm thiab kev txhim kho kev sib raug zoo, HPMC kuj tseem tuaj yeem ua tus hloov kho viscosity. Los ntawm kev kho qhov ntau npaum li cas ntawm HPMC hauv cov khoom siv cement, cov viscosity ntawm cov sib tov tuaj yeem tswj tau. Qhov no yog qhov tshwj xeeb tshaj yog thaum cuam tshuam nrog cov kev siv tshwj xeeb, xws li tus kheej-leveling lossis nws tus kheej-compacting pob zeb, qhov twg cov khoom ntws zoo ib yam tseem ceeb heev.
Kev siv ntawmHypromellose / HPMCtuaj yeem txhim khu kev tiv thaiv ntawm cov khoom siv cement-based rau lwm yam, xws li huab cua hnyav lossis tshuaj lom neeg tawm tsam. Lub network peb-dimensional tsim los ntawm HPMC ua raws li kev tiv thaiv kev tiv thaiv, tiv thaiv kev nkag mus ntawm dej, chloride ions, thiab lwm yam khoom tsis zoo. Qhov no txhim kho tag nrho lub neej ntev thiab kev ua tau zoo ntawm cov ntaub ntawv cement-based, txo qhov kev xav tau ntawm cov nqi kho lossis hloov pauv yav tom ntej.
Kev ua tau zoo ntawm HPMC raws li cov khoom siv ntxiv hauv cov khoom siv cement yog nyob ntawm ntau yam, suav nrog hom thiab ntau npaum li cas ntawm HPMC, qhov sib xyaw ntawm cov cement sib tov, thiab cov kev cai tshwj xeeb ntawm daim ntawv thov. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau ua tib zoo tshawb fawb thiab kev ntsuam xyuas kom zoo rau kev siv HPMC hauv ntau yam kev tsim kho.
Qhov sib ntxiv ntawm hydroxypropyl methylcellulose (HPMC) rau cov khoom siv cement muaj ntau cov txiaj ntsig uas txhim kho lawv qhov zoo thiab ua haujlwm ntev.HPMCTxhim khu kev ua haujlwm, kev sib khi lub zog, thiab kev tiv thaiv rau lwm yam xws li tawg, shrinkage, thiab tshuaj lom neeg tawm tsam. Tsis tas li ntawd, HPMC tso cai rau txo cov dej hauv cov ntsiab lus, ua rau txo qis carbon hneev taw thiab txhim kho kev ruaj khov. Txhawm rau kom tau txais txiaj ntsig zoo ntawm HPMC, kev tshawb fawb ntxiv thiab kev txhim kho yog tsim nyog los txiav txim siab qhov zoo tshaj plaws thiab siv txoj hauv kev rau kev tsim kho sib txawv.
Post lub sij hawm: Nov-04-2023