Ib qho ntawm qhov sib txawv loj tshaj plaws ntawm cov collhle qhuav thiab cov ntoo sib xyaw yog hloov kho nrog cov tshuaj sib xyaw me me. Ntxiv ib qho ntxiv rau cov hmoov av ua kom huv si tau hu ua kev hloov kho theem pib, ntxiv ob lossis ntau dua lossis ntau dua yog hloov dua tshiab. Qhov zoo ntawm cov hmoov hmoov kom qhuav ntawm cov kev xaiv kom raug ntawm cov khoom thiab kev sib koom tes thiab sib txuam ntawm ntau yam. Vim tias cov tshuaj yeeb quav tshuaj ntxiv, thiab muaj feem cuam tshuam ntau dua rau kev ua haujlwm ntawm cov hmoov av qhuav. Yog li ntawd, thaum xaiv cov quav, tus nqi ntawm cov ntxiv yuav tsum tau muab qhov tseem ceeb tshaj plaws. Cov hauv qab no yog qhia luv luv rau cov kev xaiv cov qauv tshuaj ntxiv Etaws ether.
Cellulose ether kuj tseem hu ua rheology kho tshuab ntawm cov tshuaj khib nyiab ntawm cov tshiab sib xyaw, thiab siv hauv yuav luag txhua yam cug. Cov peev txheej hauv qab no yuav tsum tau txiav txim siab thaum xaiv nws ntau yam thiab ntau npaum li cas:
(1) dej khaws cia ntawm ntau qhov kub;
(2) Thickening nyhuv, viscosity;
(3) Kev sib raug zoo ntawm kev sib thooj thiab ntsuas kub thiab qhov cuam tshuam ntawm kev sib xws nyob rau hauv cov electrolyte;
(4) Daim ntawv thiab qib etherification;
(5) Kev txhim kho ntawm cug qhib thixotropy thiab txoj kev muaj peev xwm (qhov no tsim nyog rau tshuaj cug pleev xim rau ntawm qhov chaw ntsug);
(6) kev sib cais nrawm, cov xwm txheej thiab ua tiav ntawm kev sib cais.
Ntxiv rau ntxiv rau kev ntxiv cov cellulose ether (xws li methyl cellulose ether) rau cov kua mis qhuav, tuaj yeem ntxiv, hloov kho ob zaug. Cov inorganic binders (Maas, Gypsum) hauv lub tshuaj khib nyiab) hauv lub zog ua kom muaj zog compressive ntau, tab sis muaj cov nyhuv me me ntawm lub zog tensile thiab lub zog yooj yim. Polyvinyl acetate ua ib zaj duab xis elastic nyob rau hauv lub qhov hws zeb, ua kom lub colut hlau, ua kom lub zog ua kom lub zog tiv thaiv thiab txhim kho cov hnav tsis kam. Colling tov metyl cov tshuaj khib nyiab, tshuab siv hlua hniav zoo nkauj rau cov qhob Poursing plag tsev, thiab lwm yam sib xyaw ob leeg tsis tuaj yeem txhim kho qhov zoo ntawm cov tshuaj khib, tab sis kuj txhim kho kev ua haujlwm zoo.
Hauv cov tswv yim thov, txhawm rau txhim kho kev ua tau zoo tag nrho, nws yog qhov tsim nyog los siv ntau yam ntxiv ua ke. Muaj kev sib piv kev sib piv ntawm cov khoom ntxiv. Ntev npaum li cov koob tshuaj ntau npaum li cas thiab piv yog tsim nyog, lawv tuaj yeem txhim kho kev ua tau zoo ntawm lub tshuaj khib los ntawm kev sib txig sib txawv. Txawm li cas los xij, thaum siv nyob ib leeg, hloov kho cov txiaj ntsig ntawm lub tshuaj khib thiab qee zaum muaj kev cuam tshuam tsis zoo, thaum ntxiv cov dej haus ntawm cov tshuaj khib thiab Khaws nws sab hauv cov slurry, uas ua rau muaj kev txo qis hauv lub zog compressive; Thaum sib xyaw nrog huab cua-enraining tus neeg sawv cev, txawm hais tias qib ntawm stratification ntawm lub tshuaj khib yuav zoo li cov dej pheebsuab. Txhawm rau txhim kho kev ua tau zoo ntawm masonry collent mus rau qhov loj tshaj plaws, thiab tib lub sijhawm zam kev ua kom tau raws li cov phiaj xwm masonry, ua kom tau raws li cov phiaj xwm ntawm txoj haujlwm thiab cov txuj ci tseem ceeb Cov lus qhia tshwj xeeb. Nyob rau tib lub sijhawm, tsis muaj txiv qaub muab tshuaj txhuam, txuag rau cov cement, kev tiv thaiv ib puag ncig, thiab lwm yam. Cua-entraining yas.
Lub Sijhawm Post: Lub Tsib Hlis-08-2023