Cov roj gypsum desulfurization yog cov pa roj flue uas tsim los ntawm kev hlawv cov roj sulfur uas muaj cov roj (thee, roj av), cov khib nyiab khov kho uas tsim tawm thaum lub sijhawm desulfurization purification, thiab cov gypsum hemihydrate (tshuaj mis CaSO4 · 0.5H2O), qhov kev ua tau zoo sib xws li cov gypsum hauv tsev. Yog li ntawd, muaj ntau thiab ntau qhov kev tshawb fawb thiab kev siv cov gypsum desulfurized es tsis txhob siv cov gypsum ntuj los tsim cov khoom siv tus kheej. Cov tshuaj polymer admixtures xws li cov neeg sawv cev txo dej, tus neeg sawv cev khaws dej thiab retarder yog cov khoom tseem ceeb hauv cov khoom siv mortar tus kheej. Kev sib cuam tshuam thiab cov txheej txheem ntawm ob qho nrog cov ntaub ntawv cementitious yog cov teeb meem tsim nyog mloog. Vim yog cov yam ntxwv ntawm cov txheej txheem tsim, qhov zoo ntawm gypsum desulfurized yog me me (qhov loj me feem ntau faib ntawm 40 thiab 60 μm), thiab cov hmoov gradation tsis tsim nyog, yog li cov khoom rheological ntawm desulfurized gypsum tsis zoo, thiab cov slurry mortar uas nws npaj feem ntau yooj yim dua. Kev sib cais, stratification thiab kev los ntshav tshwm sim. Cellulose ether yog cov admixture feem ntau siv hauv mortar, thiab nws siv ua ke nrog cov neeg sawv cev txo dej yog qhov tseem ceeb lav kom paub txog kev ua tau zoo ntawm cov khoom siv desulfurized gypsum-based self-leveling xws li kev ua tau zoo ntawm kev tsim kho thiab tom qab ntawd kev ua haujlwm kho tshuab thiab kev ua haujlwm ntev.
Hauv daim ntawv no, tus nqi fluidity yog siv ua tus ntsuas kev tswj hwm (degree kis 145 mm ± 5 mm), tsom mus rau qhov cuam tshuam ntawm cov ntsiab lus ntawm cellulose ether thiab qhov hnyav molecular (viscosity value) ntawm kev siv dej ntawm cov khoom siv desulfurized gypsum-based self-leveling, qhov poob ntawm fluidity dhau sijhawm, thiab coagulation Txoj cai ntawm kev cuam tshuam ntawm cov khoom yooj yim xws li lub sijhawm thiab cov khoom siv kho tshuab thaum ntxov; tib lub sijhawm, sim txoj cai ntawm kev cuam tshuam ntawm cellulose ether ntawm kev tso cua sov thiab tus nqi tso cua sov ntawm desulfurized gypsum hydration, tshuaj xyuas nws cov kev cuam tshuam rau cov txheej txheem hydration ntawm desulfurized gypsum, thiab pib tham txog hom admixture no Kev sib raug zoo nrog desulfurization gypsum gelling system.
1. Cov ntaub ntawv raw thiab cov txheej txheem sim
1.1 Cov khoom siv raw
Hmoov Gypsum: hmoov gypsum desulfurized tsim los ntawm lub tuam txhab hauv Tangshan, cov khoom siv tseem ceeb yog hemihydrate gypsum, nws cov tshuaj lom neeg tau qhia hauv Rooj 1, thiab nws cov khoom siv lub cev tau qhia hauv Rooj 2.
daim duab
daim duab
Cov tshuaj ntxiv muaj xws li: cellulose ether (hydroxypropyl methylcellulose, HPMC luv luv); superplasticizer WR; defoamer B-1; EVA redispersible latex hmoov S-05, tag nrho cov no muaj nyob hauv khw.
Cov khoom sib xyaw: xuab zeb dej ntuj, xuab zeb zoo ua los ntawm tus kheej sieved los ntawm 0.6 hli sieve.
1.2 Txoj kev sim
Ruaj khov desulfurization gypsum: xuab zeb: dej = 1: 0.5: 0.45, qhov ntau ntawm lwm cov admixtures tsim nyog, fluidity ua tus tswj index (nthuav dav 145 hli ± 5 hli), los ntawm kev kho cov dej siv, feem sib xyaw nrog cov ntaub ntawv cementitious (desulfurization gypsum + Cement) 0, 0.5‰, 1.0‰, 2.0‰, 3.0‰ cellulose ether (HPMC-20,000); ntxiv kho qhov koob tshuaj ntawm cellulose ether rau 1‰, xaiv HPMC-20,000, HPMC-40,000, HPMC-75,000, thiab HPMC-100,000 hydroxypropyl methylcellulose ethers nrog cov qhov hnyav molecular sib txawv (cov lej sib xws yog H2, H4, H7.5, thiab H10 feem), los kawm txog qhov koob tshuaj thiab qhov hnyav molecular (viscosity tus nqi) ntawm cellulose ether. Kev cuam tshuam ntawm kev hloov pauv ntawm cov khoom ntawm gypsum-based self-leveling mortar, thiab kev cuam tshuam ntawm ob qho ntawm qhov fluidity, teeb tsa lub sijhawm thiab cov khoom siv kho tshuab thaum ntxov ntawm desulfurized gypsum self-leveling mortar sib xyaw tau tham txog. Txoj kev xeem tshwj xeeb yog ua raws li cov kev cai ntawm GB / T 17669.3-1999 "Kev Txiav Txim Siab ntawm Cov Khoom Siv Kho Tshuab ntawm Lub Tsev Gypsum".
Qhov kev sim kub ntawm hydration yog ua tiav siv cov qauv dawb ntawm desulfurized gypsum thiab cov qauv nrog cellulose ether cov ntsiab lus ntawm 0.5‰ thiab 3‰, raws li, thiab cov cuab yeej siv yog TA-AIR hom cua sov ntawm hydration tester.
2. Cov txiaj ntsig thiab kev tshuaj xyuas
2.1 Cov nyhuv ntawm cov ntsiab lus cellulose ether rau cov khoom yooj yim ntawm cov mortar
Nrog rau qhov nce ntawm cov ntsiab lus, qhov ua haujlwm tau zoo thiab kev sib koom ua ke ntawm cov mortar tau zoo dua, qhov poob ntawm cov kua dej dhau sijhawm tau txo qis, thiab kev ua haujlwm tsim kho zoo dua, thiab cov mortar tawv tsis muaj qhov tshwm sim delamination, thiab qhov du ntawm qhov chaw, du thiab Aesthetics tau zoo dua. Tib lub sijhawm, kev siv dej ntawm cov mortar kom ua tiav tib qho kua dej tau nce ntxiv. Ntawm 5‰, kev siv dej tau nce 102%, thiab lub sijhawm teeb tsa zaum kawg tau ntev dua 100 feeb, uas yog 2.5 npaug ntawm cov qauv dawb paug. Cov khoom siv kho tshuab thaum ntxov ntawm cov mortar tau txo qis nrog qhov nce ntawm cov ntsiab lus ntawm cellulose ether. Thaum cov ntsiab lus ntawm cellulose ether yog 5‰, 24 teev flexural zog thiab compressive zog txo qis rau 18.75% thiab 11.29% ntawm cov qauv dawb paug feem. Lub zog compressive yog 39.47% thiab 23.45% ntawm cov qauv dawb paug feem. Nws yog ib qho tsim nyog sau tseg tias nrog rau kev nce ntxiv ntawm cov dej-tuav tus neeg sawv cev, qhov ceev ntawm cov mortar kuj txo qis heev, los ntawm 2069 kg / m3 ntawm 0 mus rau 1747 kg / m3 ntawm 5‰, txo qis ntawm 15.56%. Qhov ceev ntawm cov mortar txo qis thiab qhov porosity nce, uas yog ib qho ntawm cov laj thawj rau qhov pom tseeb txo qis hauv cov khoom siv kho tshuab ntawm cov mortar.
Cellulose ether yog ib qho polymer uas tsis yog ionic. Cov hydroxyl pawg ntawm cov cellulose ether saw thiab cov pa oxygen ntawm cov ether bond tuaj yeem sib xyaw nrog cov dej molecules los tsim cov hydrogen bonds, hloov cov dej dawb mus rau hauv cov dej khi, yog li ua lub luag haujlwm hauv kev khaws dej. Macroscopically Nws yog manifested ua qhov nce hauv kev sib koom ua ke ntawm cov slurry [5]. Qhov nce hauv slurry viscosity yuav tsis tsuas yog ua rau kom muaj dej ntau ntxiv, tab sis kuj tseem yuav ua rau cov cellulose ether yaj yuav raug adsorbed rau ntawm qhov chaw ntawm cov khoom gypsum, cuam tshuam cov tshuaj tiv thaiv hydration thiab ua kom lub sijhawm teeb tsa ntev; thaum lub sijhawm do, ntau lub npuas cua kuj tseem yuav raug qhia. Voids yuav tsim thaum cov mortar tawv, thaum kawg txo qhov muaj zog ntawm cov mortar. Xav txog qhov kev siv dej ib leeg ntawm cov mortar sib xyaw, kev ua haujlwm ntawm kev tsim kho, lub sijhawm teeb tsa thiab cov khoom siv kho tshuab, thiab tom qab ntawd durability, thiab lwm yam, cov ntsiab lus ntawm cellulose ether hauv desulfurized gypsum-based self-leveling mortar yuav tsum tsis pub tshaj 1‰.
2.2 Cov nyhuv ntawm qhov hnyav molecular ntawm cellulose ether rau kev ua tau zoo ntawm mortar
Feem ntau, qhov siab dua qhov viscosity thiab qhov finer qhov fineness ntawm cellulose ether, qhov zoo dua qhov kev khaws cia dej thiab ua rau lub zog sib txuas ntxiv. kev ua tau zoo yuav raug cuam tshuam tsis zoo. Yog li ntawd, qhov cuam tshuam ntawm cellulose ethers ntawm qhov hnyav molecular sib txawv ntawm cov khoom yooj yim ntawm gypsum-based self-leveling mortar cov ntaub ntawv tau raug sim ntxiv. Qhov kev thov dej ntawm cov mortar nce mus rau qee qhov, tab sis tsis muaj qhov cuam tshuam rau lub sijhawm teeb tsa thiab fluidity. Tib lub sijhawm, lub zog flexural thiab compressive ntawm mortar hauv ntau lub xeev tau qhia txog kev poob qis, tab sis qhov poob qis dua qhov cuam tshuam ntawm cellulose ether cov ntsiab lus ntawm cov khoom siv kho tshuab. Hauv kev xaus, qhov nce ntawm qhov hnyav molecular ntawm cellulose ether tsis muaj qhov cuam tshuam rau kev ua tau zoo ntawm cov khoom sib xyaw mortar. Xav txog qhov yooj yim ntawm kev tsim kho, qhov viscosity qis thiab me me-molecular-weight cellulose ether yuav tsum tau xaiv ua desulfurized gypsum-based self-leveling cov ntaub ntawv.
2.3 Cov nyhuv ntawm cellulose ether rau qhov kub ntawm hydration ntawm desulfurized gypsum
Nrog rau kev nce ntxiv ntawm cov ntsiab lus ntawm cellulose ether, lub ncov exothermic ntawm hydration ntawm desulfurized gypsum maj mam txo qis, thiab lub sijhawm ntawm qhov chaw siab tshaj plaws tau qeeb me ntsis, thaum lub cua sov exothermic ntawm hydration txo qis, tab sis tsis pom tseeb. Qhov no qhia tau hais tias cellulose ether tuaj yeem ncua qhov nrawm hydration thiab qib hydration ntawm desulfurized gypsum rau qee qhov, yog li cov koob tshuaj yuav tsum tsis txhob loj dhau, thiab yuav tsum tau tswj hwm hauv 1‰. Nws tuaj yeem pom tias zaj duab xis colloidal tsim tom qab cellulose ether ntsib dej yog adsorbed rau ntawm qhov chaw ntawm desulfurized gypsum cov khoom me me, uas txo qhov nrawm hydration ntawm gypsum ua ntej 2 teev. Tib lub sijhawm, nws cov dej khaws cia tshwj xeeb thiab cov teebmeem thickening ncua qhov evaporation ntawm slurry dej thiab Dissipation yog qhov zoo rau kev ntxiv hydration ntawm desulfurized gypsum hauv theem tom qab. Hauv kev xaus, thaum cov koob tshuaj tsim nyog raug tswj hwm, cellulose ether muaj kev cuam tshuam tsawg rau qhov nrawm hydration thiab qib hydration ntawm desulfurized gypsum nws tus kheej. Tib lub sijhawm, qhov nce ntawm cov cellulose ether cov ntsiab lus thiab qhov hnyav molecular yuav ua rau kom cov viscosity ntawm cov slurry thiab qhia txog kev ua tau zoo heev ntawm kev khaws dej. Yuav kom ntseeg tau tias cov kua ntawm cov desulfurized gypsum tus kheej-leveling mortar, kev siv dej yuav nce ntxiv, uas yog vim lub sijhawm teeb tsa ntev ntawm cov mortar. Qhov laj thawj tseem ceeb rau kev poob qis ntawm cov khoom siv kho tshuab.
3. Xaus Lus
(1) Thaum siv cov kua dej ua tus ntsuas kev tswj, nrog rau kev nce ntawm cov ntsiab lus ntawm cellulose ether, lub sijhawm teeb tsa ntawm desulfurized gypsum-based self-leveling mortar ntev heev, thiab cov khoom siv kho tshuab raug txo qis heev; piv nrog cov ntsiab lus, qhov hnyav molecular ntawm cellulose ether Qhov nce ntxiv tsis muaj feem cuam tshuam rau cov khoom saum toj no ntawm mortar. Xav txog kom meej, cellulose ether yuav tsum tau xaiv nrog qhov hnyav molecular me me (viscosity tus nqi qis dua 20 000 Pa · s), thiab cov koob tshuaj yuav tsum tau tswj hwm hauv 1‰ ntawm cov khoom siv cementitious.
(2) Cov txiaj ntsig ntawm kev sim ntawm qhov kub ntawm hydration ntawm desulfurized gypsum qhia tau hais tias nyob rau hauv qhov kev sim no, cellulose ether muaj kev cuam tshuam tsawg rau qhov nrawm ntawm hydration thiab cov txheej txheem hydration ntawm desulfurized gypsum. Kev nce ntxiv ntawm kev siv dej thiab qhov txo qis ntawm qhov ceev yog cov laj thawj tseem ceeb rau kev txo qis ntawm cov khoom siv kho tshuab ntawm desulfurized gypsum-based mortar.
Lub sijhawm tshaj tawm: Tsib Hlis-08-2023