Cellulose ether yog ib qho khoom siv ntxiv hauv cov khoom siv hauv tsev, siv los txhim kho kev tsim kho kev ua haujlwm thiab cov cuab yeej cuab tam ntawm mortar. Fineness yog ib qho ntawm cov yam ntxwv tseem ceeb ntawm cellulose ether, uas yog hais txog nws cov particle loj tis.
Cov yam ntxwv thiab kev siv ntawm cellulose ether
Cellulose ether feem ntau suav nrog hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), thiab lwm yam. Lawv lub luag haujlwm tseem ceeb hauv tsev mortar suav nrog:
Kev tuav dej: los ntawm kev txo cov dej evaporation, ncua sij hawm cement hydration, thiab txhim kho lub zog mortar.
Thickening: Ua kom cov viscosity ntawm mortar thiab txhim kho kev tsim kho.
Txhim kho kev ua kom tawg: Cov dej tuav cov cuab yeej ntawm cellulose ether pab tswj lub ntsws ntawm cov cement, yog li txo qhov tshwm sim ntawm cov kab nrib pleb hauv mortar.
Lub fineness ntawm cellulose ether cuam tshuam nws dispersibility, solubility thiab efficiency nyob rau hauv mortar, yog li cuam tshuam rau tag nrho cov kev ua tau zoo ntawm mortar.
Cov nyhuv ntawm cellulose ether fineness ntawm mortar zog tuaj yeem txheeb xyuas los ntawm cov hauv qab no:
1. Dissolution tus nqi thiab dispersibility
Qhov sib tov ntawm cellulose ether nyob rau hauv dej yog ze ze rau nws fineness. Cellulose ether hais nrog ntau dua fineness yog yooj yim yaj nyob rau hauv dej, yog li sai sai tsim ib tug uniform dispersion. Qhov kev faib tawm niaj hnub no tuaj yeem ua kom cov dej ruaj khov thiab ua kom tuab nyob rau hauv tag nrho cov mortar system, txhawb nqa kev ua tiav ntawm cov cement hydration cov tshuaj tiv thaiv, thiab txhim kho lub zog thaum ntxov ntawm mortar.
2. Lub peev xwm tuav dej
Qhov zoo ntawm cellulose ether cuam tshuam nws cov dej tuav kev ua haujlwm. Cellulose ether hais nrog ntau dua fineness muab ib tug loj cheeb tsam ntawm qhov chaw, yog li tsim ntau dej-retaining microporous lug nyob rau hauv mortar. Cov micropores no tuaj yeem khaws dej tau zoo, ua kom lub sijhawm cement hydration cov tshuaj tiv thaiv, txhawb kev tsim cov khoom siv dej, thiab yog li txhim kho lub zog ntawm mortar.
3. Interface bonding
Vim lawv cov dispersibility zoo, cellulose ether hais nrog ntau dua fineness yuav tsim ib tug ntau yam kev sib raug zoo txheej ntawm mortar thiab aggregate, thiab txhim kho lub interface bonding ntawm mortar. Cov nyhuv no pab cov mortar tuav zoo plasticity nyob rau hauv thaum ntxov theem, txo qhov tshwm sim ntawm shrinkage tawg, thiab yog li txhim kho lub zuag qhia tag nrho lub zog.
4. Kev txhawb nqa ntawm cov cement hydration
Thaum lub sij hawm cement hydration txheej txheem, tsim cov khoom hydration yuav tsum tau ib tug npaum li cas ntawm cov dej. Cellulose ether nrog kev ua kom zoo dua tuaj yeem tsim cov dej tsis sib xws hauv mortar, zam qhov teeb meem ntawm cov dej tsis txaus los yog ntau dhau hauv zos, ua kom muaj kev vam meej ntawm cov tshuaj tiv thaiv dej, thiab yog li txhim kho lub zog ntawm mortar.
Kev sim tshawb nrhiav thiab kev txheeb xyuas qhov tshwm sim
Txhawm rau txhawm rau txheeb xyuas cov txiaj ntsig ntawm cellulose ether fineness ntawm mortar zog, qee qhov kev tshawb fawb tau kho qhov zoo ntawm cellulose ether thiab kuaj nws cov khoom siv ntawm cov tshuaj khib hauv ntau qhov sib txawv.
Kev sim tsim
Qhov kev sim no feem ntau siv cov qauv cellulose ether ntawm qhov sib txawv finenesses thiab ntxiv rau cov cement mortar feem. Los ntawm kev tswj hwm lwm yam sib txawv (xws li dej-cement ratio, aggregate ratio, mixing time, thiab lwm yam), tsuas yog cov fineness ntawm cellulose ether hloov. Cov kev ntsuam xyuas lub zog, suav nrog lub zog compressive thiab lub zog flexural, yog tom qab ntawd ua tiav.
Cov txiaj ntsig kev sim feem ntau qhia tias:
Cellulose ether cov qauv nrog ntau dua fineness tuaj yeem txhim kho lub zog compressive thiab flexural zog ntawm mortar thaum ntxov (xws li 3 hnub thiab 7 hnub).
Nrog rau qhov txuas ntxiv ntawm lub sijhawm kho (xws li 28 hnub), cellulose ether nrog kev ua kom zoo dua tuaj yeem ua kom cov dej tuav tau zoo thiab kev sib raug zoo, uas qhia kev loj hlob ruaj khov.
Piv txwv li, nyob rau hauv ib qho kev sim, lub zog compressive ntawm cellulose ethers nrog fineness ntawm 80 mesh, 100 mesh, thiab 120 mesh nyob rau hauv 28 hnub yog 25 MPa, 28 MPa, thiab 30 MPa, feem. Qhov no qhia tau hais tias ntau dua qhov fineness ntawm cellulose ether, qhov ntau dua lub zog compressive ntawm mortar.
Kev siv tswv yim ntawm cellulose ether fineness optimization
1. Kho raws li qhov chaw tsim kho
Thaum tsim nyob rau hauv ib puag ncig qhuav los yog nyob rau hauv qhov kub thiab txias, cellulose ether nrog ntau dua fineness yuav raug xaiv los txhim kho cov dej tuav ntawm mortar thiab txo lub zog poob los ntawm dej evaporation.
2. Siv nrog lwm cov tshuaj ntxiv
Cellulose ether nrog kev ua kom zoo dua tuaj yeem siv ua ke nrog lwm cov khoom siv ntxiv (xws li cov dej txo qis thiab cov cua nkag mus rau cov neeg ua haujlwm) txhawm rau txhim kho kev ua haujlwm ntawm mortar. Piv txwv li, kev siv cov dej reducers tuaj yeem txo cov dej-cement piv thiab nce qhov ntom ntawm mortar, thaum cellulose ether muab dej tuav thiab ntxiv dag zog. Kev sib xyaw ua ke ntawm ob tuaj yeem txhim kho lub zog ntawm mortar.
3. Kev ua kom zoo ntawm cov txheej txheem tsim kho
Thaum lub sij hawm tsim kho, nws yog ib qhov tsim nyog los xyuas kom meej tias cov cellulose ether yog tag nrho yaj thiab dispersed. Qhov no tuaj yeem ua tiav los ntawm kev nce lub sijhawm sib xyaw lossis siv cov khoom sib xyaw tsim nyog los xyuas kom meej tias cov txiaj ntsig zoo ntawm cellulose ether yog siv tag nrho.
Qhov zoo ntawm cellulose ether muaj qhov cuam tshuam loj rau lub zog ntawm mortar. Cellulose ether nrog kev ua kom zoo dua tuaj yeem ua tau zoo dua lub luag haujlwm ntawm cov dej tuav, thickening thiab txhim kho kev sib txuas ntawm kev sib txuas, thiab txhim kho lub zog thaum ntxov thiab lub sijhawm ntev ntawm cov khoom siv tshuaj khib nyiab. Hauv kev siv cov tswv yim, qhov zoo ntawm cellulose ether yuav tsum raug xaiv kom tsim nyog thiab siv raws li kev tsim kho tshwj xeeb thiab cov kev xav tau txhawm rau txhim kho kev ua haujlwm mortar thiab txhim kho qhov project zoo.
Post lub sij hawm: Jun-24-2024