Cellulose ether yog ib qho khoom siv ntxiv rau hauv cov ntaub ntawv tsim kho, siv los txhim kho kev ua haujlwm ntawm kev tsim kho thiab cov khoom siv kho tshuab ntawm cov mortar. Qhov zoo yog ib qho ntawm cov yam ntxwv tseem ceeb ntawm cellulose ether, uas yog hais txog nws qhov kev faib tawm ntawm cov khoom me me.
Cov yam ntxwv thiab daim ntawv thov ntawm cellulose ether
Cellulose ether feem ntau suav nrog hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), thiab lwm yam. Lawv cov haujlwm tseem ceeb hauv kev tsim cov mortar suav nrog:
Kev khaws dej: los ntawm kev txo cov dej ua pa, ua kom lub sijhawm ua kom cov cement noo ntev dua, thiab ua kom lub zog ntawm cov mortar zoo dua.
Thickening: Ua kom cov mortar viscosity nce thiab txhim kho kev ua haujlwm ntawm kev tsim kho.
Txhim kho kev tiv thaiv kab nrib pleb: Cov khoom siv khaws dej ntawm cellulose ether pab tswj kev ntsws ntawm cov cement, yog li txo qhov tshwm sim ntawm cov kab nrib pleb hauv cov mortar.
Qhov zoo ntawm cellulose ether cuam tshuam rau nws qhov kev tawg, kev yaj thiab kev ua haujlwm zoo hauv mortar, yog li cuam tshuam rau kev ua haujlwm tag nrho ntawm mortar.
Cov nyhuv ntawm cellulose ether fineness ntawm lub zog mortar tuaj yeem soj ntsuam los ntawm cov hauv qab no:
1. Kev nrawm thiab kev tawg ua me me
Qhov kev yaj ntawm cellulose ether hauv dej muaj feem cuam tshuam nrog nws qhov zoo. Cov cellulose ether me me uas muaj qhov zoo dua yooj yim yaj hauv dej, yog li ua rau muaj kev sib kis sai. Qhov kev faib tawm no tuaj yeem ua kom muaj dej ruaj khov thiab tuab hauv tag nrho cov mortar system, txhawb kev nce qib ntawm cov tshuaj cement hydration, thiab txhim kho lub zog thaum ntxov ntawm mortar.
2. Muaj peev xwm khaws dej tau
Qhov zoo ntawm cellulose ether cuam tshuam rau nws txoj kev ua haujlwm khaws dej. Cov cellulose ether me me uas muaj qhov zoo dua muab thaj chaw loj dua, yog li tsim cov qauv microporous uas khaws dej ntau dua hauv cov mortar. Cov micropores no tuaj yeem khaws dej tau zoo dua, ua kom lub sijhawm ua kom cov cement hydration ntev dua, txhawb kev tsim cov khoom hydration, thiab yog li ua kom lub zog ntawm mortar zoo dua.
3. Kev sib txuas ntawm qhov sib txuas
Vim lawv cov khoom tawg tau zoo, cov cellulose ether uas muaj qhov zoo dua tuaj yeem tsim cov txheej sib txuas zoo dua ntawm cov mortar thiab cov pob zeb sib xyaw, thiab txhim kho qhov sib txuas ntawm cov mortar. Cov nyhuv no pab cov mortar tswj tau cov yas zoo thaum ntxov, txo qhov tshwm sim ntawm cov kab nrib pleb, thiab yog li txhim kho lub zog tag nrho.
4. Kev txhawb nqa ntawm cov cement hydration
Thaum lub sijhawm ua cov cement hydration, kev tsim cov khoom hydration xav tau ib qho dej ntau. Cellulose ether nrog qhov zoo dua tuaj yeem tsim cov xwm txheej hydration sib xws hauv cov mortar, zam qhov teeb meem ntawm cov dej noo hauv zos tsis txaus lossis ntau dhau, xyuas kom meej tias muaj kev nce qib tag nrho ntawm cov tshuaj tiv thaiv hydration, thiab yog li txhim kho lub zog ntawm mortar.
Kev tshawb nrhiav thiab kev tshuaj xyuas cov txiaj ntsig
Yuav kom paub tseeb tias cov cellulose ether fineness cuam tshuam rau lub zog ntawm cov mortar, qee qhov kev tshawb fawb tau kho qhov fineness ntawm cellulose ether thiab sim nws cov khoom siv kho tshuab ntawm cov mortar nyob rau hauv ntau qhov sib txawv.
Kev tsim qauv sim
Feem ntau qhov kev sim no siv cov qauv cellulose ether ntawm ntau qhov sib txawv thiab ntxiv rau hauv cov cement mortar. Los ntawm kev tswj hwm lwm yam hloov pauv (xws li qhov sib piv ntawm dej-cement, qhov sib piv ntawm cov khoom sib sau ua ke, lub sijhawm sib tov, thiab lwm yam), tsuas yog qhov sib txawv ntawm cellulose ether hloov pauv. Tom qab ntawd muaj kev sim zog, suav nrog lub zog compressive thiab lub zog flexural.
Cov txiaj ntsig ntawm kev sim feem ntau qhia tau tias:
Cov qauv cellulose ether nrog qhov zoo dua tuaj yeem txhim kho lub zog compressive thiab lub zog flexural ntawm mortar thaum ntxov (xws li 3 hnub thiab 7 hnub).
Nrog rau kev ncua sijhawm kho (xws li 28 hnub), cellulose ether nrog qhov zoo dua tuaj yeem txuas ntxiv muab kev khaws cia dej zoo thiab kev sib txuas, qhia txog kev loj hlob ruaj khov.
Piv txwv li, hauv kev sim, lub zog compressive ntawm cellulose ethers nrog fineness ntawm 80 mesh, 100 mesh, thiab 120 mesh hauv 28 hnub yog 25 MPa, 28 MPa, thiab 30 MPa, raws li. Qhov no qhia tau hais tias qhov siab dua qhov fineness ntawm cellulose ether, qhov ntau dua qhov compressive zog ntawm mortar.
Kev siv tswv yim ntawm cellulose ether fineness optimization
1. Kho raws li qhov chaw tsim kho
Thaum tsim kho hauv qhov chaw qhuav lossis nyob rau hauv qhov kub siab, cellulose ether nrog qhov zoo dua tuaj yeem xaiv los txhim kho kev khaws dej ntawm cov mortar thiab txo qhov poob zog los ntawm dej evaporation.
2. Siv nrog lwm cov khoom ntxiv
Cov cellulose ether uas muaj qhov zoo dua tuaj yeem siv ua ke nrog lwm cov khoom ntxiv (xws li cov tshuaj txo dej thiab cov neeg sawv cev rau huab cua) kom ua kom zoo dua qub ntawm cov mortar. Piv txwv li, kev siv cov tshuaj txo dej tuaj yeem txo qhov sib piv ntawm dej-cement thiab ua rau cov mortar ntom dua, thaum cellulose ether muab cov dej khaws cia thiab ua kom muaj zog. Kev sib xyaw ua ke ntawm ob qho no tuaj yeem txhim kho lub zog ntawm mortar.
3. Kev txhim kho cov txheej txheem tsim kho
Thaum lub sijhawm tsim kho, nws yog ib qho tsim nyog los xyuas kom meej tias cov cellulose ether tau yaj tag thiab tawg. Qhov no tuaj yeem ua tiav los ntawm kev nce lub sijhawm sib tov lossis siv cov khoom siv sib tov kom tsim nyog kom ntseeg tau tias qhov zoo ntawm cellulose ether tau siv tag nrho.
Qhov zoo ntawm cellulose ether muaj qhov cuam tshuam loj rau lub zog ntawm cov mortar. Cellulose ether nrog qhov zoo dua tuaj yeem ua lub luag haujlwm zoo dua ntawm kev khaws dej, ua kom tuab thiab txhim kho kev sib txuas ntawm qhov sib txuas, thiab txhim kho lub zog thaum ntxov thiab cov khoom siv kho tshuab ntev ntawm mortar. Hauv kev siv ua haujlwm, qhov zoo ntawm cellulose ether yuav tsum tau xaiv thiab siv raws li cov xwm txheej tshwj xeeb thiab cov kev xav tau los ua kom zoo dua kev ua haujlwm ntawm mortar thiab txhim kho qhov zoo ntawm qhov project.
Lub sijhawm tshaj tawm: Lub Rau Hli-24-2024