Cov khib nyiab ntub dej yog hais txog cov khoom siv cementitious, nplua aggregate, admixture, dej thiab ntau yam khoom txiav txim siab raws li kev ua tau zoo. Raws li ib qho kev faib ua feem, tom qab ntsuas thiab sib xyaw hauv qhov chaw sib tov, nws raug thauj mus rau qhov chaw siv los ntawm lub tsheb sib tov. Khaws cov mortar sib tov rau hauv ib lub thawv tshwj xeeb thiab siv nws nyob rau lub sijhawm teev tseg. Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm cov khoom sib xyaw ntub dej yog zoo ib yam li cov pob zeb ua lag luam, thiab cov chaw ua lag luam sib xyaw ua ke tuaj yeem tsim cov khoom ntub dej sib xyaw.
1. Qhov zoo ntawm cov khoom sib xyaw ntub dej
1) Cov khib nyiab ntub dej tuaj yeem siv ncaj qha tom qab thauj mus rau qhov chaw yam tsis muaj kev ua haujlwm, tab sis cov mortar yuav tsum muab khaws cia rau hauv lub thawv airtight;
2) Cov mortar ntub dej yog npaj rau hauv lub Hoobkas kev tshaj lij, uas yog qhov tsim nyog los xyuas kom meej thiab tswj qhov zoo ntawm mortar;
3) Kev xaiv cov khoom siv raw rau cov khoom ntub dej sib xyaw yog qhov loj. Cov aggregate tuaj yeem qhuav lossis ntub, thiab nws tsis tas yuav qhuav, yog li tus nqi yuav raug txo. Tsis tas li ntawd, ib qho loj ntawm cov khoom siv tshuab xuab zeb uas tsim los ntawm cov khoom siv khib nyiab xws li ya tshauv thiab cov khoom khib nyiab xws li steel slag thiab industrial tailings tuaj yeem sib xyaw, uas tsis tsuas yog txuag cov peev txheej, tab sis kuj txo tus nqi ntawm mortar.
4) Qhov chaw tsim kho muaj ib puag ncig zoo thiab muaj kuab paug tsawg.
2. Qhov tsis zoo ntawm cov khib nyiab ntub dej
1) Txij li cov dej ntub dej sib tov sib xyaw nrog cov dej hauv cov chaw tsim khoom, thiab kev thauj mus los yog qhov loj ntawm ib zaug, nws tsis tuaj yeem tswj tau yooj yim raws li kev tsim kho thiab kev siv. Tsis tas li ntawd, cov khoom sib xyaw ntub dej yuav tsum tau muab khaws cia rau hauv lub thawv cua txias tom qab thauj mus rau qhov chaw tsim kho, yog li lub pas dej tshauv yuav tsum tau teeb tsa rau ntawm qhov chaw;
2) Lub sijhawm tsheb thauj mus los yog txwv los ntawm kev thauj mus los;
3) Txij li thaum cov khib nyiab ntub dej tau khaws cia rau ntawm qhov chaw tsim kho rau lub sijhawm ntev, muaj qee qhov kev xav tau rau kev ua haujlwm, teeb tsa lub sijhawm thiab kev ruaj ntseg ntawm kev ua haujlwm ntawm mortar.
Hydroxypropyl methylcellulose yog siv los ua tus neeg saib xyuas dej thiab rov qab ntawm cov cement mortar kom cov mortar tuaj yeem siv tau. Siv los ua cov ntawv khi hauv plastering plaster, nws txhim kho kev sib kis thiab ua kom lub sijhawm ua haujlwm ntev. Cov dej tuav kev ua tau zoo ntawm hydroxypropyl methylcellulose HPMC tiv thaiv cov slurry los ntawm kev tawg vim ziab sai heev tom qab thov, thiab txhim kho lub zog tom qab hardening. Kev tuav dej yog ib qho tseem ceeb ntawm kev ua haujlwm ntawm hydroxypropyl methylcellulose HPMC, thiab nws kuj yog ib qho kev ua tau zoo uas ntau cov tuam txhab ntub dej sib xyaw hauv tsev tau saib xyuas. Cov yam tseem ceeb uas cuam tshuam rau cov dej tuav cov nyhuv ntawm cov dej ntub dej sib xyaw muaj xws li HPMC ntxiv, qhov viscosity ntawm HPMC, qhov zoo ntawm cov khoom, thiab qhov kub ntawm qhov chaw siv.
Tom qab cov ntaub ntub dej sib xyaw yog thauj mus rau qhov chaw, nws yuav tsum tau muab cia rau hauv lub thawv uas tsis yog nqus cua. Yog tias koj xaiv lub thawv hlau, cov nyhuv cia yog qhov zoo tshaj plaws, tab sis kev nqis peev yog siab dhau, uas tsis yog qhov zoo rau kev nyiam thiab kev siv; Koj tuaj yeem siv cov cib lossis cov blocks los tsim cov pas dej tshauv, thiab tom qab ntawd siv cov tshuaj tsis muaj dej tsis zoo (dej nqus dej tsawg dua 5%) rau plaster rau saum npoo, thiab kev nqis peev yog qis tshaj. Txawm li cas los xij, plastering ntawm waterproof mortar yog ib qho tseem ceeb heev, thiab kev tsim kho zoo ntawm cov txheej txheem dej plastering yuav tsum tau ua kom ntseeg tau. Nws yog qhov zoo tshaj rau ntxiv hydroxypropyl methylcellulose HPMC cov khoom rau hauv mortar kom txo tau cov kab nrib pleb. Lub pas dej tshauv hauv pem teb yuav tsum muaj qee qhov kev nqes hav kom yooj yim tu. Lub pas dej tshauv yuav tsum muaj lub ru tsev nrog thaj chaw txaus los tiv thaiv los nag thiab hnub. Lub mortar yog khaws cia rau hauv lub pas dej tshauv, thiab qhov chaw ntawm lub pas dej tshauv yuav tsum tau them tag nrho nrog cov ntaub yas kom paub meej tias lub mortar nyob rau hauv lub xeev kaw.
Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC nyob rau hauv ntub-sib tov mortar feem ntau muaj peb yam, ib qho yog cov dej tuav tau zoo, lwm qhov yog kev cuam tshuam ntawm qhov sib xws thiab thixotropy ntawm ntub-sib tov mortar, thiab qhov thib peb yog kev cuam tshuam nrog cov cement. Cov dej tuav cov nyhuv ntawm cellulose ether nyob ntawm qhov nqus dej ntawm lub hauv paus txheej, muaj pes tsawg leeg ntawm mortar, lub thickness ntawm lub mortar txheej, cov dej xav tau ntawm cov mortar, thiab lub sij hawm teem ntawm cov khoom siv. Qhov siab dua qhov pom ntawm hydroxypropyl methylcellulose, qhov dej tuav tau zoo dua.
Cov yam ntxwv cuam tshuam rau cov dej khaws cia ntawm cov khib nyiab ntub dej muaj xws li cellulose ether viscosity, ntxiv tus nqi, particle fineness thiab siv kub. Qhov ntau dua qhov viscosity ntawm cellulose ether, qhov dej tuav tau zoo dua. Viscosity yog ib qho tseem ceeb parameter ntawm HPMC kev ua tau zoo. Rau tib yam khoom, cov txiaj ntsig viscosity ntsuas los ntawm txoj kev sib txawv yog qhov sib txawv heev, thiab qee qhov muaj qhov sib txawv ob npaug. Yog li ntawd, thaum sib piv viscosity, nws yuav tsum tau nqa tawm ntawm tib txoj kev sim, xws li kub, rotor, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav. Txawm li cas los xij, qhov siab dua qhov viscosity thiab siab dua qhov hnyav molecular ntawm HPMC, qhov sib piv ntawm nws cov solubility yuav muaj kev cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm cov mortar. Qhov siab dua qhov viscosity, qhov pom tseeb dua cov nyhuv thickening ntawm mortar, tab sis nws tsis ncaj qha proportional. Qhov siab dua qhov viscosity, qhov viscous ntau dua cov mortar ntub yuav, uas yog, thaum lub sij hawm tsim kho, nws yog manifested li sticking rau scraper thiab siab adhesion rau lub substrate. Tab sis nws tsis muaj txiaj ntsig los ua kom lub zog muaj zog ntawm cov mortar ntub nws tus kheej. Thaum lub sij hawm tsim kho, qhov kev ua tau zoo anti-sag tsis pom tseeb. Ntawm qhov tsis sib xws, qee qhov hloov kho hydroxypropyl methylcellulose nrog nruab nrab thiab qis viscosity muaj kev ua tau zoo hauv kev txhim kho lub zog ntawm cov khoom ntub dej.
Hauv cov khib nyiab ntub dej, qhov sib ntxiv ntawm cellulose ether HPMC yog qhov tsawg heev, tab sis nws tuaj yeem txhim kho kev tsim kho ntawm cov khib nyiab ntub dej, thiab nws yog ib qho tseem ceeb ntxiv uas cuam tshuam rau kev tsim kho ntawm mortar. Kev xaiv tsim nyog ntawm qhov tseeb hydroxypropyl methylcellulose muaj kev cuam tshuam zoo rau kev txhim kho kev ua haujlwm ntawm cov khoom ntub dej sib xyaw.
Post lub sij hawm: Apr-04-2023