Dab tsi yog cov haujlwm thiab cov kev xav tau ntawm ntau yam ntaub ntawv hauv gypsum-based self-leveling mortar?

(1) Gypsum

Raws li cov ntaub ntawv raw siv, nws muab faib ua hom II anhydrite thiab α-hemihydrate gypsum. Cov khoom siv uas lawv siv yog:

① Hom II anhydrous gypsum

Cov pob tshab gypsum los yog alabaster nrog qib siab thiab mos zoo nkauj yuav tsum tau xaiv. Lub calcination kub yog nyob nruab nrab ntawm 650 thiab 800 ° C, thiab hydration yog nqa tawm nyob rau hauv qhov kev txiav txim ntawm ib tug activator.

②-Gypsum hemihydrate

-Lub tshuab tsim khoom ntawm hemihydrate gypsum feem ntau suav nrog cov txheej txheem hloov pauv qhuav thiab cov txheej txheem hloov pauv ntub dej feem ntau ua ke lub cev qhuav dej thiab ziab.

(2) Cement

Thaum npaj tus kheej-leveling gypsum, ib qho me me ntawm cov cement tuaj yeem ntxiv, thiab nws cov haujlwm tseem ceeb yog:

① Muab ib puag ncig alkaline rau qee yam khoom siv;

② Txhim kho qhov softening coefficient ntawm gypsum hardened lub cev;

③ Txhim kho slurry fluidity;

④ Kho lub sijhawm teeb tsa ntawm hom Ⅱ anhydrous gypsum self-leveling gypsum.

Cov cement siv yog 42.5R Portland cement. Thaum npaj cov xim nws tus kheej-leveling gypsum, dawb Portland cement tuaj yeem siv. Tus nqi ntawm cov cement ntxiv tsis pub tshaj 15%.

(3) Kev teeb tsa lub sijhawm tswj hwm

Nyob rau hauv tus kheej-leveling gypsum mortar, yog siv hom II anhydrous gypsum, yuav tsum tau siv ib tug accelerator, thiab yog hais tias -hemihydrate gypsum yog siv, ib tug retarder feem ntau yuav tsum tau siv.

① Coagulant: Nws muaj ntau yam sulfates thiab lawv cov ntsev ob, xws li calcium sulfate, ammonium sulfate, potassium sulfate, sodium sulfate thiab ntau yam alums, xws li alum (aluminium potassium sulfate), liab alum (potassium dichromate), bile alum ( tooj liab sulfate), thiab lwm yam:

② Kev tiv thaiv:

Citric acid los yog trisodium citrate yog ib qho kev siv gypsum retarder. Nws yog yooj yim soluble nyob rau hauv dej, muaj pom tseeb retarding nyhuv thiab tsis muaj nqi, tab sis nws kuj yuav txo tau lub zog ntawm gypsum hardened lub cev. Lwm cov gypsum retarders uas siv tau muaj xws li: kua nplaum, casein kua nplaum, hmoov txhuv nplej siab, tannic acid, tartaric acid, thiab lwm yam.

(4) Dej txo tus neeg sawv cev

Lub fluidity ntawm tus kheej-leveling gypsum yog qhov teeb meem tseem ceeb. Txhawm rau kom tau txais gypsum slurry nrog zoo fluidity, ua kom cov dej haus ib leeg yuav ua rau muaj kev txo qis hauv lub zog ntawm lub cev gypsum, thiab txawm los ntshav, uas yuav ua rau lub ntsej muag muag, plam hmoov, thiab siv tsis tau. Yog li ntawd, gypsum dej reducer yuav tsum tau qhia kom ua kom lub fluidity ntawm gypsum slurry. Cov superplasticizers haum rau kev npaj ntawm tus kheej-leveling gypsum suav nrog naphthalene-based superplasticizers, polycarboxylate high-efficiency superplasticizers, thiab lwm yam.

(5) Tus neeg saib xyuas dej

Thaum tus kheej-leveling gypsum slurry yog tus kheej-leveling, lub fluidity ntawm slurry yog txo vim dej nqus ntawm lub hauv paus. Txhawm rau kom tau txais qhov zoo tshaj plaws tus kheej-leveling gypsum slurry, ntxiv rau nws tus kheej fluidity kom tau raws li qhov yuav tsum tau ua, cov slurry yuav tsum muaj cov dej tuav zoo. Thiab vim hais tias lub fineness thiab tshwj xeeb lub ntiajteb txawj nqus ntawm gypsum thiab cement nyob rau hauv lub hauv paus cov ntaub ntawv yog txawv heev, lub slurry yog nquag delamination thaum lub sij hawm khiav thiab cov txheej txheem static hardening. Txhawm rau kom tsis txhob muaj qhov tshwm sim saum toj no, nws yog ib qho tsim nyog yuav tsum tau ntxiv me me ntawm cov dej tuav tus neeg sawv cev. Cov dej khaws cia feem ntau siv cov tshuaj cellulose, xws li methyl cellulose, hydroxyethyl cellulose thiab carboxypropyl cellulose.

(6) polymer

Txhim kho kev puas tsuaj, tawg thiab dej tsis kam ntawm cov khoom siv tus kheej-leveling siv cov hmoov polymers redispersible

(7) Defoamer Txhawm rau tshem tawm cov pa npuas tsim tawm thaum lub sijhawm sib xyaw ntawm cov ntaub ntawv, tributyl phosphate feem ntau yog siv.

(8) muab tub lim

Nws yog siv los tiv thaiv kev sib cais ntawm tus kheej-leveling khoom Cheebtsam thiaj li yuav muaj fluidity zoo dua. Fillers tuaj yeem siv tau, xws li dolomite, calcium carbonate, av ya tshauv, av dej-quenched slag, nplua xuab zeb, thiab lwm yam.

(9) Zoo sib sau ua ke

Lub hom phiaj ntawm kev ntxiv cov khoom sib xyaw zoo yog txhawm rau txo qhov ziab kom qhuav ntawm tus kheej-leveling gypsum hardened lub cev, ua kom lub zog saum npoo thiab hnav tsis kam ntawm lub cev tawv, thiab feem ntau siv quartz xuab zeb.

Dab tsi yog cov khoom yuav tsum tau rau gypsum self-leveling mortar?

β-hom hemihydrate gypsum tau txais los ntawm calcining thawj-qib dihydrate gypsum nrog purity ntau dua 90% lossis α-type hemihydrate gypsum tau los ntawm autoclaving lossis hydrothermal synthesis.

Active admixture: tus kheej-leveling cov ntaub ntawv siv tau ya tshauv, slag hmoov, thiab lwm yam raws li active admixtures, lub hom phiaj yog los txhim kho particle gradation ntawm cov khoom thiab txhim kho cov kev ua tau zoo ntawm cov khoom hardened lub cev. Slag hmoov undergoes hydration cov tshuaj tiv thaiv nyob rau hauv ib qho chaw alkaline, uas tuaj yeem txhim kho lub compactness thiab tom qab lub zog ntawm cov khoom siv.

Thaum ntxov-lub zog cementitious cov ntaub ntawv: Txhawm rau ua kom lub sijhawm tsim kho, cov ntaub ntawv qib siab tus kheej muaj qee yam kev xav tau rau lub zog thaum ntxov (feem ntau yog 24h flexural thiab compressive zog). Cov sulphoaluminate cement yog siv los ua cov khoom siv cementing thaum ntxov. Cov sulphoaluminate cement muaj qhov ceev ceev hydration thiab siab thaum ntxov lub zog, uas tuaj yeem ua tau raws li qhov xav tau ntawm lub zog thaum ntxov ntawm cov khoom.

Alkaline activator: Cov gypsum composite cementitious cov ntaub ntawv muaj lub siab tshaj plaws qhuav lub zog nyob rau hauv nruab nrab alkaline tej yam kev mob. Quicklime thiab 32.5 cement tuaj yeem siv los kho tus nqi pH los muab qhov chaw alkaline rau cov dej ntawm cov khoom cementitious.

Coagulant: Lub sijhawm teeb tsa yog qhov tseem ceeb ntawm kev ua tau zoo ntawm cov khoom siv tus kheej. Lub sijhawm luv luv lossis ntev dhau los tsis haum rau kev tsim kho. Lub coagulant txhawb kev ua haujlwm ntawm gypsum, ua kom lub zog supersaturated crystallization ceev ntawm dihydrate gypsum, ua kom lub sijhawm teem sijhawm, thiab ua kom lub sijhawm thiab lub sijhawm tawv tawv ntawm tus kheej cov ntaub ntawv hauv qhov tsim nyog.

Dej-txo tus neeg sawv cev: Txhawm rau txhim kho qhov kev cog lus thiab lub zog ntawm cov khoom siv tus kheej, nws yog qhov tsim nyog los txo cov dej-binder ratio. Nyob rau hauv cov xwm txheej ntawm kev tswj kom zoo fluidity ntawm tus kheej-leveling cov ntaub ntawv, nws yog tsim nyog los ntxiv cov dej-txo cov neeg sawv cev. Lub naphthalene-raws li dej reducer yog siv, thiab nws cov dej-txo mechanism yog cov sulfonate pawg nyob rau hauv naphthalene-raws li dej-txo molecule thiab cov dej molecule yog txuam nrog hydrogen bonds, tsim ib tug ruaj khov dej zaj duab xis nyob rau saum npoo ntawm gelled. cov khoom siv, ua kom yooj yim los tsim dej ntawm cov khoom siv. zawv zawg, yog li txo cov dej sib tov uas yuav tsum tau ua thiab txhim kho cov qauv ntawm lub cev hardened ntawm cov khoom.

Tus neeg saib xyuas dej: cov khoom siv tus kheej yog tsim los ntawm lub hauv paus hauv av, thiab kev tsim kho thickness yog nyias nyias, thiab cov dej tau yooj yim absorbed los ntawm hauv av hauv paus, ua rau cov dej tsis txaus ntawm cov khoom, cov kab nrib pleb ntawm qhov chaw, thiab txo qis. zog. Hauv qhov kev sim no, methyl cellulose (MC) raug xaiv los ua tus neeg saib xyuas dej. MC muaj qhov ntub dej zoo, tuav dej thiab ua cov yeeb yaj kiab, kom cov khoom siv tus kheej tsis tuaj yeem los ntshav thiab muaj dej txaus.

Redispersible latex hmoov (tom qab no hu ua latex hmoov): latex hmoov tuaj yeem ua kom cov elastic modulus ntawm tus kheej-leveling cov ntaub ntawv, txhim kho kev sib tsoo, kev sib raug zoo thiab dej tsis kam.

Defoamer: Lub defoamer tuaj yeem txhim kho qhov pom tseeb ntawm cov khoom siv tus kheej, txo cov npuas thaum cov khoom tsim, thiab muaj qee yam cuam tshuam rau kev txhim kho lub zog ntawm cov khoom.