Cov Lus Qhia Txog:Kev kawm txog cov nyhuv ntawm cov ntsiab lus sib txawv ntawm hydroxypropyl methylcellulose ether rau cov yam ntxwv ntawm cov plastering mortar qhuav. Cov txiaj ntsig tau qhia tias: nrog rau kev nce ntxiv ntawm cov ntsiab lus ntawm cellulose ether, qhov sib xws thiab qhov ceev txo qis, thiab lub sijhawm teeb tsa txo qis. Lub zog txuas ntxiv, 7d thiab 28d compressive zog txo qis, tab sis kev ua tau zoo tag nrho ntawm cov plaster qhuav tau zoo dua.
0. Lus Qhia Ua Ntej
Xyoo 2007, rau lub koom haum thiab cov neeg ua haujlwm hauv lub tebchaws tau tshaj tawm "Daim Ntawv Ceeb Toom Txog Kev Txwv Tsis Pub Sib Tov Cov Mortar Hauv Qee Lub Nroog Hauv Lub Sijhawm Txwv". Tam sim no, 127 lub nroog thoob plaws lub tebchaws tau ua haujlwm ntawm "txwv tsis pub siv cov mortar uas twb muaj lawm", uas tau coj kev txhim kho tsis tau muaj dua los rau kev txhim kho cov mortar qhuav. Lub sijhawm. Nrog rau kev txhim kho ntawm cov mortar qhuav hauv kev lag luam kev tsim kho hauv tsev thiab txawv teb chaws, ntau yam mortar admixtures qhuav kuj tau nkag mus rau hauv kev lag luam tshiab no, tab sis qee lub tuam txhab tsim khoom thiab muag mortar admixture txhob txwm ua kom pom qhov ua tau zoo ntawm lawv cov khoom, ua rau kev lag luam mortar qhuav tsis meej. Kev noj qab haus huv thiab kev txhim kho zoo. Tam sim no, zoo li cov admixtures pob zeb, cov admixtures mortar qhuav feem ntau yog siv ua ke, thiab tsawg tus siv ib leeg. Tshwj xeeb, muaj ntau hom admixtures hauv qee cov mortars qhuav ua haujlwm tau zoo, tab sis Hauv cov mortar qhuav ib txwm, tsis tas yuav ua raws li tus lej ntawm cov admixtures, tab sis yuav tsum tau them sai sai rau nws qhov kev siv tau thiab kev ua haujlwm, kom tsis txhob siv ntau dhau ntawm cov mortar admixtures, ua rau muaj kev pov tseg tsis tsim nyog, thiab txawm tias cuam tshuam rau qhov zoo ntawm qhov project. Hauv cov mortar qhuav ib txwm, cellulose ether ua lub luag haujlwm ntawm kev khaws dej, thickening, thiab kev txhim kho kev ua haujlwm ntawm kev tsim kho. Kev ua tau zoo ntawm kev khaws dej zoo ua kom ntseeg tau tias cov mortar qhuav sib xyaw yuav tsis ua rau sanding, hmoov thiab txo lub zog vim tsis muaj dej txaus thiab tsis tiav cement hydration; qhov thickening effect ua rau lub zog ntawm cov mortar ntub zoo dua. Daim ntawv no ua ib txoj kev tshawb fawb txog kev siv cellulose ether hauv cov mortar qhuav ib txwm, uas muaj qhov tseem ceeb rau kev siv cov admixtures kom raug hauv cov mortar qhuav ib txwm.
1. Cov ntaub ntawv raw thiab cov txheej txheem siv rau hauv kev xeem
1.1 Cov ntaub ntawv raw rau kev sim
Cov cement yog P. 042.5 cement, cov tshauv ya yog Class II tshauv los ntawm lub chaw tsim hluav taws xob hauv Taiyuan, cov pob zeb zoo yog cov xuab zeb qhuav ntawm tus dej uas muaj qhov loj li 5 hli lossis ntau dua, qhov fineness modulus yog 2.6, thiab cov cellulose ether yog hydroxypropyl methyl cellulose ether muaj nyob hauv khw (viscosity 12000 MPa·s).
1.2 Txoj kev sim
Kev npaj cov qauv thiab kev sim ua tau raws li JCJ/T 70-2009 txoj kev sim ua tau zoo ntawm cov tshuaj nplaum tsev.
2. Txoj kev npaj sim
2.1 Cov qauv rau qhov kev xeem
Hauv qhov kev xeem no, qhov ntau ntawm txhua yam khoom siv raw ntawm 1 tuj ntawm cov tshuaj plastering qhuav yog siv ua cov mis yooj yim rau qhov kev xeem, thiab cov dej yog cov dej siv ntawm 1 tuj ntawm cov tshuaj plaster qhuav.
2.2 Txoj kev npaj tshwj xeeb
Siv cov mis no, qhov ntau ntawm hydroxypropyl methylcellulose ether ntxiv rau txhua tuj ntawm cov plastering mortar qhuav yog: 0.0 kg / t, 0.1 kg / t, 0.2 kg / t, 0.3 kg / t, 0.4 kg / tt, 0.6 kg / t, los kawm txog cov teebmeem ntawm cov koob tshuaj sib txawv ntawm hydroxypropyl methylcellulose ether ntawm kev khaws cia dej, kev sib xws, qhov pom tseeb, lub sijhawm teeb tsa, thiab lub zog compressive ntawm cov plastering mortar qhuav, txhawm rau coj cov plastering qhuav. Kev siv cov mortar admixtures kom raug tuaj yeem paub qhov zoo ntawm cov txheej txheem tsim cov mortar qhuav yooj yim, kev tsim kho yooj yim, kev tiv thaiv ib puag ncig thiab kev txuag hluav taws xob.
3. Cov txiaj ntsig ntawm kev xeem thiab kev tshuaj xyuas
3.1 Cov txiaj ntsig ntawm kev xeem
Cov teebmeem ntawm cov koob tshuaj sib txawv ntawm hydroxypropyl methylcellulose ether rau ntawm kev khaws cia dej, kev sib xws, qhov ceev pom tseeb, lub sijhawm teeb tsa, thiab lub zog compressive ntawm cov plastering mortar qhuav sib xyaw.
3.2 Kev tshuaj xyuas cov txiaj ntsig
Nws tuaj yeem pom los ntawm cov nyhuv ntawm cov koob tshuaj sib txawv ntawm hydroxypropyl methylcellulose ether rau kev khaws cia dej, kev sib xws, qhov pom tseeb, lub sijhawm teeb tsa, thiab lub zog compressive ntawm cov plastering mortar qhuav sib xyaw. Nrog rau kev nce ntawm cellulose ether cov ntsiab lus, qhov ceev ntawm kev khaws cia dej ntawm cov mortar ntub kuj maj mam nce, los ntawm 86.2% thaum hydroxypropyl methyl cellulose tsis sib xyaw, mus rau 0.6% thaum hydroxypropyl methyl cellulose sib xyaw. Qhov ceev ntawm kev khaws cia dej ncav cuag 96.3%, uas ua pov thawj tias qhov cuam tshuam ntawm kev khaws cia dej ntawm propyl methyl cellulose ether zoo heev; qhov sib xws maj mam txo qis nyob rau hauv qhov cuam tshuam ntawm kev khaws cia dej ntawm propyl methyl cellulose ether (kev siv dej ib tuj ntawm mortar tseem tsis hloov pauv thaum lub sijhawm sim); Qhov ceev pom tseeb qhia txog kev poob qis, qhia tias qhov cuam tshuam ntawm kev khaws cia dej ntawm propyl methyl cellulose ether ua rau qhov ntim ntawm cov mortar ntub nce thiab txo qhov ceev; Lub sijhawm teeb tsa maj mam ntev zuj zus nrog rau qhov nce ntawm cov ntsiab lus ntawm hydroxypropyl methyl cellulose ether, thiab cov ntsiab lus ntawm Thaum nws mus txog 0.4%, nws txawm tshaj qhov teev tseg ntawm 8h xav tau los ntawm tus qauv, qhia tias kev siv hydroxypropyl methylcellulose ether kom raug muaj cov txiaj ntsig zoo rau lub sijhawm ua haujlwm ntawm cov av ntub; lub zog compressive ntawm 7d thiab 28d tau txo qis (Qhov ntau dua qhov koob tshuaj, qhov pom tseeb dua qhov txo qis). Qhov no yog cuam tshuam nrog qhov nce ntawm qhov ntim ntawm cov av thiab qhov txo qis ntawm qhov pom tseeb. Kev ntxiv ntawm hydroxypropyl methyl cellulose ether tuaj yeem tsim lub qhov kaw hauv cov av tawv thaum lub sijhawm teeb tsa thiab tawv ntawm cov av. Micropores txhim kho qhov ruaj khov ntawm cov av.
4. Cov kev ceev faj rau kev siv cellulose ether hauv cov mortar qhuav sib xyaw ua ke
1) Kev xaiv cov khoom cellulose ether. Feem ntau hais lus, qhov viscosity ntawm cellulose ether ntau dua, qhov zoo dua nws cov dej tuav, tab sis qhov viscosity siab dua, qhov qis dua nws solubility, uas yog qhov tsis zoo rau lub zog thiab kev ua haujlwm ntawm cov mortar; qhov fineness ntawm cellulose ether yog qhov tsawg heev hauv cov mortar qhuav-mixed. Lawv hais tias qhov finer nws yog, qhov yooj yim dua nws yog yaj. Nyob rau hauv tib lub koob tshuaj, qhov finer qhov fineness, qhov zoo dua cov dej tuav.
2) Kev xaiv cov tshuaj cellulose ether. Los ntawm cov txiaj ntsig ntawm kev sim thiab kev tshuaj xyuas ntawm cov nyhuv ntawm cov ntsiab lus ntawm cellulose ether rau kev ua haujlwm ntawm cov plastering mortar qhuav, nws tuaj yeem pom tias cov ntsiab lus ntawm cellulose ether siab dua, qhov zoo dua, nws yuav tsum tau xav txog los ntawm tus nqi tsim khoom, cov khoom zoo, kev ua haujlwm tsim kho thiab Plaub yam ntawm qhov chaw tsim kho kom xaiv cov tshuaj kom haum. Cov tshuaj ntawm hydroxypropyl methyl cellulose ether hauv cov plastering mortar qhuav yog qhov zoo dua 0.1 kg / t-0.3 kg / t, thiab cov dej khaws cia tsis tuaj yeem ua tau raws li cov qauv kev cai yog tias qhov ntau ntawm hydroxypropyl methyl cellulose ether ntxiv rau hauv qhov me me. Kev sib tsoo zoo; cov tshuaj ntawm hydroxypropyl methyl cellulose ether hauv cov plastering mortar tshwj xeeb uas tiv taus tawg yog li 3 kg / t.
3) Kev siv cellulose ether rau hauv cov mortar qhuav sib xyaw. Thaum npaj cov mortar qhuav sib xyaw, koj tuaj yeem ntxiv cov admixture kom haum, zoo dua nrog qee qhov dej khaws cia thiab thickening effect, yog li nws tuaj yeem tsim cov nyhuv sib xyaw nrog cellulose ether, txo cov nqi tsim khoom, thiab txuag cov peev txheej; yog tias siv ib leeg Rau cellulose ether, lub zog sib txuas tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua, thiab koj tuaj yeem ntxiv cov hmoov latex redispersible kom haum; vim tias cov admixture mortar tsawg, qhov yuam kev ntsuas loj thaum siv ib leeg. Qhov zoo ntawm cov khoom mortar qhuav sib xyaw.
5. Cov Lus Xaus thiab Cov Lus Qhia
1) Hauv cov tshuaj nplaum plastering qhuav, nrog rau kev nce ntxiv ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose ether, tus nqi khaws dej tuaj yeem ncav cuag 96.3%, qhov sib xws thiab qhov ceev raug txo qis, thiab lub sijhawm teeb tsa ntev dua. Lub zog compressive ntawm 28d txo qis, tab sis kev ua tau zoo tag nrho ntawm cov tshuaj nplaum qhuav tau txhim kho thaum cov ntsiab lus ntawm hydroxypropyl methyl cellulose ether yog qhov nruab nrab.
2) Thaum npaj cov mortar qhuav sib xyaw, yuav tsum xaiv cov cellulose ether uas muaj viscosity thiab fineness tsim nyog, thiab nws cov koob tshuaj yuav tsum txiav txim siab nruj me ntsis los ntawm kev sim. Vim tias cov tshuaj mortar admixture tsawg, qhov yuam kev ntsuas loj thaum siv ib leeg. Nws raug pom zoo kom sib tov nrog tus neeg nqa khoom ua ntej, thiab tom qab ntawd nce qhov ntau ntxiv kom ntseeg tau tias cov khoom mortar qhuav sib xyaw zoo.
3) Cov xuab zeb sib xyaw qhuav yog ib qho kev lag luam tshiab hauv Suav teb. Thaum siv cov xuab zeb sib xyaw, peb yuav tsum tsis txhob nrhiav kom muaj ntau npaum li cas, tab sis yuav tsum ua tib zoo saib xyuas qhov zoo thiab txo cov nqi tsim khoom, txhawb kom siv cov khib nyiab pov tseg hauv kev lag luam, thiab ua tiav kev txuag hluav taws xob thiab txo kev siv.
Lub sijhawm tshaj tawm: Lub Ob Hlis-22-2023