Cov av nplaum sib xyaw ua ke yog hais txog cov khoom siv cementitious, cov pob zeb me me, cov khoom sib xyaw, dej thiab ntau yam khoom sib xyaw uas txiav txim siab raws li kev ua tau zoo. Raws li qee qhov sib piv, 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 av nplaum sib xyaw rau hauv lub thawv tshwj xeeb thiab siv nws hauv lub sijhawm teev tseg. Lub hauv paus ntsiab lus ua haujlwm ntawm cov av nplaum sib xyaw ua ke zoo ib yam li cov pob zeb ua lag luam, thiab qhov chaw sib tov pob zeb ua lag luam tuaj yeem tsim cov av nplaum sib xyaw ua ke tib lub sijhawm.
1. Cov txiaj ntsig ntawm cov mortar ntub-sib xyaw
1) Cov mortar ntub sib xyaw siv tau ncaj qha tom qab raug thauj mus rau qhov chaw yam tsis tau ua tiav, tab sis cov mortar yuav tsum khaws cia rau hauv lub thawv kaw;
2) Cov mortar ntub-sib xyaw yog npaj rau hauv lub Hoobkas tshaj lij, uas yog qhov zoo rau kev ua kom ntseeg tau thiab tswj qhov zoo ntawm cov mortar;
3) Kev xaiv cov khoom siv raw rau cov mortar ntub sib xyaw yog loj heev. Cov pob zeb sib xyaw tuaj yeem qhuav lossis ntub, thiab nws tsis tas yuav ziab, yog li tus nqi tuaj yeem txo qis. Tsis tas li ntawd, ntau cov xuab zeb cuav tsim los ntawm cov khib nyiab lag luam xws li cov tshauv ya thiab cov khib nyiab khov kho lag luam xws li cov hlau slag thiab cov tailings lag luam tuaj yeem sib xyaw, uas tsis tsuas yog txuag cov peev txheej, tab sis kuj txo cov nqi ntawm mortar.
4) Qhov chaw tsim kho muaj ib puag ncig zoo thiab muaj kuab paug tsawg dua.
2. Qhov tsis zoo ntawm cov mortar ntub sib xyaw
1) Vim tias cov av nplaum ntub sib xyaw nrog dej hauv lub Hoobkas tsim khoom tshaj lij, thiab qhov ntim thauj khoom loj heev ib zaug, nws tsis tuaj yeem tswj tau raws li kev nce qib thiab kev siv ntawm kev tsim kho. Tsis tas li ntawd, cov av nplaum ntub sib xyaw yuav tsum khaws cia rau hauv lub thawv kaw tom qab thauj mus rau qhov chaw tsim kho, yog li yuav tsum muaj pas dej tshauv teeb tsa rau ntawm qhov chaw;
2) Lub sijhawm thauj mus los raug txwv los ntawm cov xwm txheej tsheb khiav;
3) Vim tias cov mortar ntub sib xyaw khaws cia rau ntawm qhov chaw tsim kho rau lub sijhawm ntev, muaj qee qhov yuav tsum tau ua rau kev ua haujlwm tau zoo, lub sijhawm teeb tsa thiab kev ruaj khov ntawm kev ua haujlwm ntawm cov mortar.
Hydroxypropyl methylcellulose siv ua tus neeg sawv cev khaws dej thiab retarder ntawm cement mortar kom ua rau cov mortar pumpable. Siv ua tus binder hauv plastering plaster, nws txhim kho kev nthuav dav thiab ntev lub sijhawm ua haujlwm. Kev ua tau zoo ntawm hydroxypropyl methylcellulose HPMC tiv thaiv cov slurry los ntawm kev tawg vim qhuav sai dhau tom qab thov, thiab ua kom lub zog tom qab hardening. Kev khaws dej yog ib qho tseem ceeb ntawm hydroxypropyl methylcellulose HPMC, thiab nws kuj yog ib qho kev ua tau zoo uas ntau lub tuam txhab tsim cov mortar ntub dej hauv tsev tau them sai sai rau. Cov yam ntxwv cuam tshuam rau kev khaws dej ntawm cov mortar ntub dej suav nrog qhov ntau ntawm HPMC ntxiv, qhov viscosity ntawm HPMC, qhov zoo ntawm cov khoom me me, thiab qhov kub ntawm qhov chaw siv.
Tom qab cov mortar ntub sib xyaw raug thauj mus rau qhov chaw, nws yuav tsum khaws cia rau hauv lub thawv uas tsis nqus tau cua. Yog tias koj xaiv lub thawv hlau, qhov zoo tshaj plaws rau kev khaws cia yog qhov zoo tshaj plaws, tab sis kev nqis peev siab dhau, uas tsis zoo rau kev nrov thiab kev siv; koj tuaj yeem siv cib lossis thaiv los tsim lub pas dej tshauv, thiab tom qab ntawd siv cov mortar tsis muaj dej (qhov nqus dej tsawg dua 5%) los plaster qhov chaw, thiab kev nqis peev yog qhov qis tshaj plaws. Txawm li cas los xij, kev plastering ntawm cov mortar tsis muaj dej yog qhov tseem ceeb heev, thiab qhov zoo ntawm kev tsim kho ntawm cov txheej tsis muaj dej plastering yuav tsum tau ua kom ntseeg tau. Nws yog qhov zoo tshaj plaws los ntxiv hydroxypropyl methylcellulose HPMC khoom rau hauv cov mortar kom txo cov kab nrib pleb mortar. Lub hauv paus pas dej tshauv yuav tsum muaj qee qhov kev nqes hav rau kev ntxuav yooj yim. Lub pas dej tshauv yuav tsum muaj lub ru tsev nrog thaj chaw txaus los tiv thaiv nag thiab hnub. Cov mortar khaws cia rau hauv lub pas dej tshauv, thiab qhov chaw ntawm lub pas dej tshauv yuav tsum tau npog tag nrho nrog daim ntaub yas kom ntseeg tau tias cov mortar nyob rau hauv lub xeev kaw.
Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC hauv cov mortar ntub feem ntau muaj peb yam, ib qho yog lub peev xwm khaws dej zoo heev, qhov thib ob yog qhov cuam tshuam rau qhov sib xws thiab thixotropy ntawm cov mortar ntub, thiab qhov thib peb yog kev sib cuam tshuam nrog cement. Cov nyhuv khaws dej ntawm cellulose ether nyob ntawm qhov nqus dej ntawm cov txheej hauv paus, cov khoom sib xyaw ntawm cov mortar, qhov tuab ntawm cov txheej mortar, qhov xav tau dej ntawm cov mortar, thiab lub sijhawm teeb tsa ntawm cov khoom teeb tsa. Qhov siab dua qhov pom tseeb ntawm hydroxypropyl methylcellulose, qhov zoo dua qhov khaws dej.
Cov yam tseem ceeb uas cuam tshuam rau kev khaws dej ntawm cov tshuaj sib xyaw ntub suav nrog cellulose ether viscosity, qhov ntau ntxiv, qhov zoo ntawm cov khoom me me thiab kev siv kub. Qhov ntau dua qhov viscosity ntawm cellulose ether, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej. Viscosity yog ib qho tseem ceeb ntawm HPMC kev ua tau zoo. Rau tib yam khoom, cov txiaj ntsig viscosity ntsuas los ntawm ntau txoj kev sib txawv yog txawv heev, thiab qee qhov txawm tias muaj ob npaug sib txawv. Yog li ntawd, thaum piv viscosity, nws yuav tsum tau ua tiav ntawm tib txoj kev sim, suav nrog kub, rotor, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua qhov dej khaws cia nyhuv. Txawm li cas los xij, qhov siab dua qhov viscosity thiab qhov siab dua qhov hnyav molecular ntawm HPMC, qhov txo qis hauv nws cov solubility yuav muaj qhov cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm cov mortar. Qhov siab dua qhov viscosity, qhov pom tseeb ntau dua qhov thickening nyhuv ntawm cov mortar, tab sis nws tsis yog proportional ncaj qha. Qhov siab dua qhov viscosity, qhov ntau dua viscosity cov ntub mortar yuav yog, uas yog, thaum lub sijhawm tsim kho, nws yog manifested li lo rau ntawm scraper thiab siab adhesion rau lub substrate. Tab sis nws tsis pab kom nce lub zog ntawm cov ntub mortar nws tus kheej. Thaum lub sijhawm tsim kho, qhov kev ua tau zoo tiv thaiv-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 heev hauv kev txhim kho lub zog ntawm cov ntub mortar.
Hauv cov mortar ntub-sib xyaw, qhov ntxiv ntawm cellulose ether HPMC yog qhov tsawg heev, tab sis nws tuaj yeem txhim kho kev ua tau zoo ntawm cov mortar ntub-sib xyaw, thiab nws yog ib qho khoom ntxiv tseem ceeb uas cuam tshuam rau kev ua tau zoo ntawm mortar. Kev xaiv tsim nyog ntawm hydroxypropyl methylcellulose kom raug muaj kev cuam tshuam loj rau kev txhim kho kev ua tau zoo ntawm cov mortar ntub-sib xyaw.
Lub sijhawm tshaj tawm: Plaub Hlis-04-2023