Cellulose ethers yog ib pawg ntawm cov organic polymer compounds siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv cov pob zeb thiab mortar. Ua ib qho additive, cellulose ether muaj feem cuam tshuam loj rau ntau yam khoom ntawm cov pob zeb, suav nrog kev ua haujlwm tau zoo, kev khaws dej, lub zog, kev sib txuas, thiab lwm yam.
1. Kev cuam tshuam rau kev ua haujlwm tau zoo
Cellulose ethers tuaj yeem txhim kho qhov ua haujlwm ntawm cov pob zeb ua vaj tse, tshwj xeeb tshaj yog thaum lub sijhawm sib tov thiab kev tsim kho. Cellulose ether muaj cov nyhuv ua kom tuab zoo thiab tuaj yeem ua rau cov viscosity thiab rheology ntawm cov pob zeb ua vaj tse nce ntxiv, ua rau nws yooj yim dua rau kev ua haujlwm thiab duab. Qhov kev ua tau zoo no tseem ceeb heev rau cov txheej txheem kev tsim kho uas xav tau kev ua haujlwm siab, xws li cov pob zeb pumped thiab shotcrete.
Cellulose ether tuaj yeem txhim kho qhov lubricity ntawm cov pob zeb ua vaj tse thiab txo qhov kev sib txhuam ntawm cov khoom me me thaum lub sijhawm sib tov, yog li txhim kho qhov sib xws thiab kev ua haujlwm ntawm cov pob zeb ua vaj tse. Qhov no pab cov pob zeb ua tiav cov duab zoo dua thiab qhov chaw tiav thaum lub sijhawm tsim kho.
2. Cov nyhuv rau kev khaws dej
Cellulose ether muaj peev xwm khaws dej tau zoo thiab nws cov qauv molecular muaj ntau pawg hydrophilic, uas tuaj yeem nqus tau thiab khaws cov dej noo. Cov yam ntxwv no tso cai rau cellulose ethers kom txhim kho qhov khaws dej hauv cov pob zeb ua vaj tse, tshwj xeeb tshaj yog nyob rau hauv qhov chaw qhuav lossis cov txheej txheem nyias. Cellulose ethers tuaj yeem txo qhov dej evaporation sai thiab zam kev tawg thiab txo lub zog los ntawm kev poob dej thaum ntxov hauv cov pob zeb ua vaj tse.
Los ntawm kev ua kom cov dej khaws cia ntawm cov pob zeb ua vaj tse, cellulose ether kuj tseem tuaj yeem ua kom lub sijhawm ua kom cov cement hydration ntev dua, ua rau cov cement me me tau hydrated tag nrho, yog li txhim kho lub zog thiab kev ruaj khov ntawm cov pob zeb ua vaj tse. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej qhuav, xws li kev tsim kho lub caij ntuj sov lossis qhov chaw kub siab, kev khaws cia dej ntawm cellulose ether ua lub luag haujlwm tseem ceeb hauv kev ua tiav kawg ntawm cov pob zeb ua vaj tse.
3. Kev cuam tshuam rau lub zog
Cellulose ether muaj qee yam cuam tshuam rau kev txhim kho lub zog ntawm cov pob zeb ua vaj tse, tshwj xeeb tshaj yog rau lub zog thaum ntxov. Vim tias cellulose ether txhim kho kev khaws dej ntawm cov pob zeb ua vaj tse, qhov kev sib xyaw ua ke ntawm cov cement tiav ntau dua, thiab cov khoom siv thaum ntxov nce ntxiv, yog li txhim kho lub zog thaum ntxov ntawm cov pob zeb ua vaj tse. Tib lub sijhawm, cellulose ether kuj tseem tuaj yeem txhim kho lub zog tom qab ntawm cov pob zeb ua vaj tse los ntawm kev txhim kho qhov sib xws ntawm nws cov qauv sab hauv.
Yuav tsum nco ntsoov tias qhov ntau npaum li cas ntawm cellulose ether yuav tsum tsim nyog. Yog tias qhov ntau npaum li cas ntau dhau, txawm hais tias kev khaws dej thiab rheology tau txhim kho, nws yuav cuam tshuam rau lub zog kawg ntawm cov pob zeb, tshwj xeeb tshaj yog lub zog tom qab. Qhov no yog vim tias ntau dhau cellulose ether tuaj yeem cuam tshuam kev ntxiv dej ntawm cov cement thiab txo lawv qhov kev txhim kho lub zog tom qab.
4. Kev cuam tshuam rau kev ntsws thiab tawg ntawm cov pob zeb
Cellulose ether tuaj yeem txo qhov qhuav qhuav deformation thiab shrinkage tawg ntawm cov pob zeb los ntawm kev txhim kho cov dej khaws cia ntawm cov pob zeb. Cov kab nrib pleb shrinkage feem ntau yog tshwm sim los ntawm kev ntxhov siab concentration hauv cov pob zeb los ntawm kev ua pa ntau dhau ntawm dej. Kev khaws cia dej ntawm cellulose ether tuaj yeem ua rau qeeb cov txheej txheem no, ua rau cov pob zeb khaws cia lub xeev noo noo rau lub sijhawm ntev dua hauv qhov chaw qhuav, yog li txo qhov tshwm sim ntawm cov kab nrib pleb.
Qhov ua kom cov cellulose ether hauv cov pob zeb ua kom tuab tuaj yeem txhim kho lub zog sib txuas ntawm cov pob zeb, txhim kho qhov compactness thiab kev ncaj ncees ntawm nws cov qauv sab hauv, thiab txo qhov kev pheej hmoo ntawm kev tawg. Cov khoom no muaj cov ntawv thov tseem ceeb hauv cov pob zeb loj, cov mortar nyias lossis cov ntaub ntawv cement.
5. Kev cuam tshuam rau kev ruaj khov ntawm cov pob zeb
Cov cellulose ethers txhawb nqa lub zog ntawm cov pob zeb hauv ntau txoj kev. Ua ntej, cellulose ethers tuaj yeem txhim kho qhov kev tiv thaiv te thiab kev tiv thaiv ntsev ntawm cov pob zeb. Vim tias cellulose ether tuaj yeem txo cov qhov capillary hauv cov pob zeb thiab txo qhov nkag mus ntawm dej, cov pob zeb tiv taus kev tawm tsam sab nraud hauv thaj chaw txias lossis qhov chaw ntsev-roj.
Cov cellulose ethers txhim kho qhov ceev thiab tawg tsis kam ntawm cov pob zeb los ntawm kev txhim kho nws cov dej tuav thiab kev txhim kho lub zog. Cov khoom no muaj txiaj ntsig zoo rau lub neej ntev ntawm cov pob zeb, tshwj xeeb tshaj yog nyob rau hauv cov choj, qhov av thiab lwm yam haujlwm uas raug cuam tshuam loj heev los ntawm kev puas tsuaj ib puag ncig. Kev ntxiv ntawm cellulose ether tuaj yeem txhim kho qhov ruaj khov ntawm cov pob zeb.
6. Kev cuam tshuam rau cov khoom sib txuas ntawm cov pob zeb
Cov cellulose ethers kuj muaj qhov cuam tshuam zoo rau cov khoom sib txuas ntawm cov pob zeb ua vaj tse, tshwj xeeb tshaj yog rau lub zog sib txuas ntawm cov mortar thiab txheej hauv paus. Vim tias cellulose ether tuaj yeem ua rau cov viscosity ntawm cov pob zeb ua vaj tse nce ntxiv, nws yooj yim dua los sib cuag nrog cov ntaub ntawv hauv paus thaum lub sijhawm tsim kho, yog li ua kom muaj kev sib txuas ntawm ob qho tib si. Qhov no yog qhov tseem ceeb heev rau cov ntawv thov xws li phab ntsa plastering thiab kho cov haujlwm uas xav tau kev nplaum siab.
Ua ib qho admixture nrog kev ua tau zoo heev, cellulose ether muaj qhov cuam tshuam zoo rau kev ua haujlwm tau zoo, kev khaws dej, lub zog, shrinkage tawg thiab kev ruaj khov ntawm cov pob zeb. Los ntawm kev ntxiv cov cellulose ether kom raug, kev ua tau zoo tag nrho ntawm cov pob zeb tuaj yeem txhim kho kom tau raws li qhov xav tau ntawm ntau yam kev tsim kho tshwj xeeb. Txawm li cas los xij, qhov ntau npaum li cas ntawm cellulose ether yuav tsum tau tswj hwm kom raug raws li qhov xav tau tiag tiag engineering kom tsis txhob siv ntau dhau uas yuav ua rau lub zog txo qis lossis lwm yam kev phiv.
Lub sijhawm tshaj tawm: Cuaj hlis-19-2024