Nyob rau hauv xyoo tas los no, nrog kev txhim kho txuas ntxiv ntawm cov cuab yeej siv hluav taws xob sab nraud, kev nce qib ntawm cov khoom siv cellulose, thiab cov yam ntxwv zoo ntawm HPMC nws tus kheej, HPMC tau siv dav hauv kev tsim kho kev lag luam.
Txhawm rau txhawm rau tshawb nrhiav cov txheej txheem ntawm kev ua haujlwm ntawm HPMC thiab cov khoom siv cement, daim ntawv no tsom mus rau kev txhim kho cov txiaj ntsig ntawm HPMC ntawm cov khoom sib txuas ntawm cov khoom siv cement.
lub sijhawm ua ntshav
Lub sijhawm teeb tsa ntawm pob zeb yog feem ntau cuam tshuam nrog lub sijhawm teeb tsa ntawm cov cement, thiab qhov sib sau ua ke muaj kev cuam tshuam me me, yog li lub sijhawm teeb tsa ntawm mortar tuaj yeem siv hloov pauv los kawm txog HPMC ntawm lub sijhawm teem sijhawm ntawm cov dej tsis sib xyaw ua ke, vim tias lub sijhawm teeb tsa ntawm mortar raug cuam tshuam los ntawm dej Yog li ntawd, txhawm rau ntsuas qhov cuam tshuam ntawm HPMC ntawm lub sijhawm teeb tsa ntawm mortar, nws yog ib qho tsim nyog yuav tsum tau kho cov dej-cement ratio thiab mortar ratio ntawm mortar.
Raws li qhov kev sim, qhov sib ntxiv ntawm HPMC muaj qhov cuam tshuam tseem ceeb ntawm cov tshuaj khib nyiab sib xyaw, thiab lub sijhawm teeb tsa ntawm lub mortar prolongs txuas ntxiv nrog qhov nce ntawm HPMC cov ntsiab lus. Raws li tib cov ntsiab lus HPMC, lub hauv qab moulded mortar yog nrawm dua li cov mortar tsim hauv huab cua. Lub sijhawm teeb tsa ntawm nruab nrab molding yog ntev dua. Thaum ntsuas hauv dej, piv nrog cov qauv dawb, lub sijhawm teeb tsa ntawm mortar tov nrog HPMC ncua sijhawm 6-18 teev rau kev teeb tsa thawj zaug thiab 6-22 teev rau qhov kawg. Yog li ntawd, HPMC yuav tsum tau siv ua ke nrog accelerators.
HPMC yog ib lub siab molecular polymer nrog macromolecular linear qauv thiab hydroxyl pab pawg neeg ua haujlwm, uas tuaj yeem tsim hydrogen bonds nrog cov dej sib xyaw molecules thiab ua kom cov viscosity ntawm cov dej sib tov. Qhov ntev molecular chains ntawm HPMC yuav nyiam ib leeg, ua rau HPMC molecules entangle nrog ib leeg los tsim ib tug network qauv, qhwv MAAs thiab sib tov dej. Txij li thaum HPMC tsim cov qauv sib txuas zoo ib yam li zaj duab xis thiab qhwv cov cement, nws yuav tiv thaiv kom tsis txhob muaj dej hauv cov mortar, thiab cuam tshuam los yog txo qis cov dej ntawm cov cement.
Ntshav
Qhov tshwm sim los ntshav ntawm mortar zoo ib yam li cov pob zeb, uas yuav ua rau muaj kev sib haum xeeb loj, ua rau muaj kev nce hauv cov dej-cement piv ntawm cov txheej saum toj kawg nkaus ntawm slurry, ua rau cov yas loj ntawm cov txheej txheem slurry nyob rau hauv thaum ntxov. theem, thiab txawm tawg, thiab lub zog ntawm txheej txheej ntawm slurry kuj tsis muaj zog.
Thaum noj ntau dua 0.5%, tsis muaj qhov tshwm sim los ntshav. Qhov no yog vim hais tias thaum HPMC tov rau hauv mortar, HPMC muaj ib tug zaj duab xis-tsim thiab network qauv, thiab cov adsorption ntawm hydroxyl pawg ntawm cov saw ntev ntawm macromolecules ua rau cov cement thiab sib tov dej nyob rau hauv mortar tsim ib tug flocculation, kom ruaj khov qauv. ntawm mortar. Tom qab ntxiv HPMC rau hauv mortar, muaj ntau yam ywj pheej me npuas npuas yuav tsim. Cov npuas huab cua no yuav sib npaug sib npaug hauv cov tshuaj khib nyiab thiab cuam tshuam qhov kev tso tawm ntawm aggregate. Kev ua tau zoo ntawm HPMC muaj kev cuam tshuam zoo rau cov khoom siv cement, thiab nws feem ntau siv los npaj cov cement-based composite cov ntaub ntawv tshiab xws li cov hmoov qhuav mortar thiab polymer mortar, kom nws muaj dej zoo thiab khaws cia yas.
Mortar dej xav tau
Thaum tus nqi ntawm HPMC me me, nws muaj kev cuam tshuam zoo rau cov dej xav tau ntawm cov mortar. Nyob rau hauv rooj plaub ntawm kev ua kom qhov nthuav dav ntawm cov mortar tshiab yeej zoo ib yam, HPMC cov ntsiab lus thiab cov dej xav tau ntawm cov mortar hloov nyob rau hauv ib qho kev sib raug zoo nyob rau hauv ib lub sij hawm ntawm lub sij hawm, thiab cov dej xav tau ntawm lub mortar thawj zaug txo thiab ces nce. pom tseeb. Thaum tus nqi ntawm HPMC tsawg dua 0.025%, nrog qhov nce ntawm cov nyiaj, cov dej xav tau ntawm cov mortar txo qis hauv tib qhov kev nthuav dav, uas qhia tau hais tias thaum tus nqi ntawm HPMC me me, nws muaj qhov txo qis hauv dej. mortar, thiab HPMC muaj cov nyhuv cua nkag. Muaj ntau cov pa npuas me me nyob rau hauv lub mortar, thiab cov pa npuas no ua cov roj nplua nyeem los txhim kho cov kua dej ntawm cov tshuaj khib. Thaum qhov ntau npaum li cas ntau dua 0.025%, qhov kev thov dej ntawm cov mortar nce nrog qhov nce ntawm qhov ntau npaum. Qhov no yog vim hais tias lub network qauv ntawm HPMC tau ua tiav ntxiv, thiab qhov sib txawv ntawm cov flocs ntawm cov saw hlau ntev molecular yog luv, uas muaj cov nyhuv ntawm kev nyiam thiab kev sib koom ua ke, thiab txo qhov fluidity ntawm mortar. Yog li ntawd, nyob rau hauv cov xwm txheej uas qhov kev nthuav dav ntawm qhov pib zoo ib yam, cov slurry qhia tau hais tias qhov kev thov dej nce ntxiv.
01. Dispersion resistance test:
Anti-dispersion yog ib qho tseem ceeb kev ntsuas ntsuas los ntsuas qhov zoo ntawm tus neeg sawv cev tiv thaiv dispersion. HPMC yog cov dej-soluble polymer compound, tseem hu ua dej-soluble resin lossis dej-soluble polymer. Nws nce qhov sib xws ntawm qhov sib tov los ntawm kev ua kom cov viscosity ntawm cov dej sib tov. Nws yog cov khoom siv hydrophilic polymer uas tuaj yeem yaj hauv dej los tsim cov tshuaj. los yog dispersion.
Cov kev sim qhia tau hais tias thaum tus nqi ntawm naphthalene-based high-efficiency superplasticizer nce, qhov sib ntxiv ntawm superplasticizer yuav txo tau cov dispersion tsis kam ntawm freshly mixed cement mortar. Qhov no yog vim hais tias cov naphthalene-raws li high-efficiency dej reducer yog surfactant. Thaum cov dej reducer ntxiv rau hauv cov mortar, cov dej reducer yuav tau taw qhia rau ntawm cov cement hais kom ua rau cov cement seem muaj cov nqi tib yam. Qhov hluav taws xob repulsion no ua rau cov cement particles tsim Cov qauv flocculation ntawm cov cement yog dismantled, thiab cov dej qhwv hauv cov qauv raug tso tawm, uas yuav ua rau poob ntawm ib feem ntawm cov cement. Nyob rau tib lub sijhawm, nws pom tau hais tias nrog kev nce ntawm HPMC cov ntsiab lus, qhov kev tsis sib haum xeeb ntawm cov cement mortar tshiab tau zoo dua thiab zoo dua.
02. Strength yam ntxwv ntawm pob zeb:
Nyob rau hauv ib qhov kev sim hauv paus project, HPMC underwater non-dispersible qhob admixture tau siv, thiab tus tsim lub zog qib yog C25. Raws li qhov kev sim yooj yim, cov cement yog 400kg, cov silica fume compounded yog 25kg / m3, qhov zoo ntawm HPMC yog 0.6% ntawm cov cement, cov dej-cement piv yog 0.42, xuab zeb tus nqi yog 40%. thiab cov zis ntawm naphthalene-raws li high-efficiency dej reducer yog tus nqi ntawm cov cement yog 8%, qhov nruab nrab 28d lub zog ntawm cov pob zeb ua qauv hauv huab cua yog 42.6MPa, 28d nruab nrab lub zog ntawm cov pob zeb hauv qab dej nrog qhov poob siab ntawm 60mm yog 36.4MPa, thiab lub zog piv ntawm cov dej tsim ua pob zeb rau cov pob zeb ua cua yog 84.8%, cov nyhuv tseem ceeb dua.
03. Kev sim qhia:
(1) Qhov sib ntxiv ntawm HPMC muaj qhov cuam tshuam pom tseeb ntawm cov tshuaj khib nyiab sib tov. Nrog rau qhov nce ntawm HPMC cov ntsiab lus, lub sijhawm teeb tsa ntawm mortar txuas ntxiv txuas ntxiv mus. Raws li cov ntsiab lus HPMC tib yam, cov mortar tsim nyob rau hauv dej yog sai dua li uas tsim nyob rau hauv huab cua. Lub sijhawm teeb tsa ntawm nruab nrab molding yog ntev dua. Cov yam ntxwv no muaj txiaj ntsig zoo rau kev siv dej hauv qab dej.
(2) Cov cement mortar tshiab sib xyaw nrog hydroxypropyl methylcellulose muaj cov khoom sib txuas zoo thiab yuav luag tsis muaj los ntshav.
(3) Tus nqi ntawm HPMC thiab cov dej xav tau ntawm mortar txo qis ua ntej thiab tom qab ntawd nce ntxiv.
(4) Kev sib koom ua ke ntawm cov dej txo tus neeg sawv cev txhim kho qhov teeb meem ntawm kev xav tau dej ntau ntxiv rau mortar, tab sis nws cov koob tshuaj yuav tsum tau tswj kom tsim nyog, txwv tsis pub cov dej tsis sib haum xeeb ntawm cov khoom sib xyaw ntawm cov cement mortar tshiab qee zaum yuav raug txo.
(5) Tsis tshua muaj qhov sib txawv ntawm cov qauv ntawm cov cement paste specimen tov nrog HPMC thiab cov qauv dawb paug, thiab muaj qhov sib txawv me ntsis ntawm cov qauv thiab qhov ntom ntawm cov cement paste specimen poured hauv dej thiab hauv huab cua. Cov qauv tsim hauv qab dej rau 28 hnub yog me ntsis nkig. Qhov laj thawj tseem ceeb yog qhov sib ntxiv ntawm HPMC zoo heev txo qhov poob thiab tawg ntawm cov cement thaum nchuav hauv dej, tab sis kuj txo cov compactness ntawm cement pob zeb. Nyob rau hauv qhov project, nyob rau hauv cov xwm txheej ntawm kev ua kom cov nyhuv ntawm tsis-dispersion nyob rau hauv dej, qhov ntau npaum ntawm HPMC yuav tsum tau txo kom ntau li ntau tau.
(6) Ntxiv HPMC underwater non-dispersible qhob admixture, tswj qhov ntau npaum li cas zoo rau lub zog. Qhov kev sim ua haujlwm qhia tau hais tias qhov sib piv ntawm lub zog ntawm cov dej ua vaj tse thiab cov pob zeb ua rau huab cua yog 84.8%, thiab cov nyhuv tseem ceeb heev.
Post lub sij hawm: May-06-2023