Hydroxypropyl Methylcellulose (HPMC) yog ib qho cellulose ether uas feem ntau siv hauv ntau yam lag luam, suav nrog kev tsim kho, tshuaj, khoom noj, thiab tshuaj pleev ib ce. Hauv kev tsim kho, HPMC feem ntau siv los ua ib qho ntxiv hauv mortar vim nws muaj peev xwm los txhim kho ntau yam khoom ntawm cov khoom sib tov, suav nrog kev ua haujlwm, tuav dej, thiab adhesion. Ib qho tseem ceeb ntawm cov tshuaj khib nyiab yog nws lub zog, thiab HPMC tuaj yeem cuam tshuam cov yam ntxwv ntawm cov tshuaj khib nyiab.
Yuav pib nrog, nws yog ib qho tseem ceeb kom nkag siab txog qhov muaj pes tsawg leeg ntawm mortar thiab lub luag haujlwm ntawm ntau yam khoom xyaw hauv kev txiav txim siab nws lub zog. Mortar yog sib xyaw ntawm cov khoom siv cementitious (xws li Portland cement), aggregates (xws li xuab zeb), dej, thiab additives. Lub zog ntawm mortar feem ntau yog nyob ntawm hydration ntawm cov cement hais, uas tsim cov matrix khi cov aggregates ua ke. Txawm li cas los xij, ntau yam, suav nrog qhov sib piv ntawm cov dej-cement, aggregate grading, thiab muaj cov additives, tuaj yeem cuam tshuam rau kev loj hlob ntawm mortar.
HPMC feem ntau ntxiv rau cov tshuaj khib nyiab sib xyaw ua cov dej tuav thiab cov kua nplaum. Nws txhim kho kev ua haujlwm tau zoo los ntawm kev txhim kho cov cohesiveness ntawm qhov sib tov, txo qis sagging los yog slumping, thiab tso cai rau kev siv zoo dua ntawm qhov chaw ntsug. Tsis tas li ntawd, HPMC tsim ib zaj duab xis nyob ib ncig ntawm cov cement particles, uas yuav pab kom khaws cov dej thiab ua kom lub sijhawm ntev ntawm cov cement, ua rau kev txhim kho lub zog ntawm lub sijhawm.
Ib txoj hauv kev tseem ceeb HPMC cuam tshuam rau lub zog mortar yog los ntawm kev txo cov dej los ntawm evaporation thaum lub sijhawm teeb tsa thiab kho cov txheej txheem. Los ntawm kev tsim cov yeeb yaj kiab tiv thaiv ntawm qhov chaw ntawm cov cement, HPMC txo tus nqi ntawm cov dej evaporates los ntawm cov tshuaj khib nyiab. Qhov ntev hydration ntawm cov cement particles ua kom tiav ntau dua thiab cov dej tsis sib xws, ua rau muaj qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom. Yog li ntawd, cov mortars uas muaj HPMC zoo li yuav nthuav tawm ntau dua compressive thiab flexural zog piv rau cov tsis muaj nws, tshwj xeeb tshaj yog tom qab hnub nyoog.
Tsis tas li ntawd, HPMC tuaj yeem ua tus neeg sawv cev dispersing, txhawb kev faib tawm ntawm cov cement thiab lwm yam khoom ntxiv thoob plaws hauv cov tshuaj khib nyiab. Qhov kev faib tawm niaj hnub no pab ua kom tau raws li lub zog muaj zog thoob plaws tag nrho cov khoom siv khib nyiab. Tsis tas li ntawd, HPMC tuaj yeem txhim kho qhov adhesion ntawm mortar rau ntau yam substrates, xws li cov chav tsev masonry los yog cov vuas, uas ua rau kom muaj zog ntawm kev sib raug zoo.
Txawm li cas los xij, nws tseem ceeb heev uas yuav tsum nco ntsoov tias cov txiaj ntsig ntawm HPMC ntawm cov tshuaj khib nyiab tuaj yeem sib txawv nyob ntawm ntau yam, suav nrog ntau npaum li cas ntawm HPMC, hom thiab ntau npaum li cas ntawm lwm cov tshuaj ntxiv uas muaj nyob rau hauv kev sib xyaw, cov yam ntxwv ntawm cov cement thiab aggregates siv, ib puag ncig puag ncig thaum sib tov, tso, thiab kho, nrog rau cov kev cai tshwj xeeb ntawm daim ntawv thov.
Thaum HPMC feem ntau txhim kho lub zog ntawm mortar, kev siv ntau dhau lossis kev siv tsis raug ntawm HPMC tuaj yeem muaj kev cuam tshuam tsis zoo. Kev kub siab ntawm HPMC tuaj yeem ua rau muaj huab cua ntau dhau, txo kev ua haujlwm, lossis ncua sij hawm teem sijhawm, uas tuaj yeem cuam tshuam tsis zoo rau tag nrho kev ua haujlwm ntawm mortar. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau ua tib zoo xav txog qhov ntau npaum li cas ntawm HPMC thiab lwm yam tshuaj ntxiv raws li cov kev cai tshwj xeeb ntawm qhov project thiab ua qhov kev ntsuam xyuas kom zoo txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau lub zog thiab kev ua haujlwm.
Hydroxypropyl Methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv kev txhim kho lub zog ntawm mortar sib xyaw siv hauv kev tsim kho. Los ntawm kev txhim kho cov dej tuav, kev ua haujlwm, thiab kev ua kom zoo, HPMC ua kom yooj yim dua dej ntawm cov cement hais, ua rau muaj zog thiab muaj zog mortar matrices. Txawm li cas los xij, kev noj kom zoo thiab kev txiav txim siab ntawm lwm cov khoom sib xyaw yog qhov tseem ceeb rau kev siv lub peev xwm tag nrho ntawm HPMC thaum zam qhov tsis zoo. Zuag qhia tag nrho, HPMC ua hauj lwm raws li ib tug tseem ceeb additive nyob rau hauv kev txhim kho cov kev ua tau zoo ntawm mortar mixes, pab mus rau lub durability thiab kev cia siab ntawm kev tsim kho tej yaam num.
Post lub sij hawm: Jun-04-2024