Nrog rau kev nce qib ntawm kev lag luam thiab kev txhim kho thev naus laus zis, los ntawm kev qhia thiab kev txhim kho ntawm txawv teb chaws mortar spraying tshuab, cov tshuab txau thiab plastering tshuab tau tsim zoo heev hauv kuv lub teb chaws hauv xyoo tas los no. Mechanical spraying mortar yog txawv ntawm cov mortar zoo tib yam, uas yuav tsum tau muaj dej tuav kev ua tau zoo, haum fluidity thiab tej yam kev tiv thaiv sagging. Feem ntau, hydroxypropyl methylcellulose yog ntxiv rau hauv mortar, ntawm cov cellulose Ether (HPMC) yog siv dav tshaj plaws. Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC hauv mortar yog: thickening thiab viscosifying, kho rheology, thiab zoo heev dej tuav peev xwm. Txawm li cas los xij, qhov tsis txaus ntawm HPMC tsis tuaj yeem tsis quav ntsej. HPMC muaj cov nyhuv air-entraining, uas yuav ua rau muaj kev cuam tshuam sab hauv ntau dua thiab txo cov khoom siv dag zog ntawm mortar. Shandong Chenbang Fine Chemical Co., Ltd. tau kawm txog kev cuam tshuam ntawm HPMC ntawm cov dej tuav tus nqi, qhov ntom ntom, cov ntsiab lus ntawm cov huab cua thiab cov khoom siv ntawm cov tshuaj khib nyiab los ntawm macroscopic nam, thiab kawm txog kev cuam tshuam ntawm hydroxypropyl methylcellulose HPMC ntawm L qauv ntawm cov tshuaj khib los ntawm lub microscopic nam. .
1. Kev xeem
1.1 Cov khoom siv raw
Cement: lag luam muaj P.0 42.5 xis mas, nws 28d flexural thiab compressive zog yog 6.9 thiab 48.2 MPa feem; xuab zeb: Chengde nplua dej xuab zeb, 40-100 mesh; cellulose ether: tsim los ntawm Shandong Chenbang Fine Chemical Co., Ltd. Hydroxypropyl methylcellulose ether, hmoov dawb, nominal viscosity 40, 100, 150, 200 Pa-s; dej: dej huv huv.
1.2 Test method
Raws li JGJ / T 105-2011 "Txoj Cai Kev Tsim Kho rau Kev Siv Tshuab Txau thiab Plastering", qhov sib xws ntawm mortar yog 80-120 hli, thiab cov dej tuav tau ntau dua 90%. Hauv qhov kev sim no, qhov sib piv ntawm txiv qaub-xuab zeb tau teem rau ntawm 1: 5, qhov sib xws tau tswj ntawm (93 + 2) mm, thiab cov cellulose ether tau muab sib xyaw rau sab nraud, thiab cov nyiaj sib xyaw yog raws li cov cement loj. Cov khoom siv ntawm cug xws li ntub dej ntom nti, cov ntsiab lus cua, thiab kev sim ua kom siv tau rau JGJ 70-2009 cov ntsiab lus tseem ceeb ntawm kev sim thiab suav raws li qhov ceev txoj kev. Kev npaj, flexural thiab compressive zog kuaj ntawm cov qauv tau ua raws li GB / T 17671-1999 "Txoj hauv kev rau Kev Ntsuas Lub Zog ntawm Cement Mortar Sand (ISO Method)". Lub cheeb ntawm lub larvae yog ntsuas los ntawm mercury porosimetry. Tus qauv ntawm mercury porosimeter yog AUTOPORE 9500, thiab qhov ntsuas ntau yog 5.5 nm-360 μm. Tag nrho ntawm 4 qhov kev xeem tau ua tiav. Cov cement-xuab zeb piv yog 1: 5, viscosity ntawm HPMC yog 100 Pa-s, thiab ntau npaum li cas 0, 0.1%, 0.2%, 0.3% (tus lej yog A, B, C, D raws li).
2. Cov txiaj ntsig thiab kev tshuaj xyuas
2.1 Cov nyhuv ntawm HPMC ntawm cov dej tuav tus nqi ntawm cov cement mortar
Kev tuav dej yog hais txog lub peev xwm ntawm mortar los tuav dej. Nyob rau hauv lub tshuab txau mortar, ntxiv cellulose ether tuaj yeem khaws cov dej kom zoo, txo cov ntshav, thiab ua tau raws li qhov yuav tsum tau muaj dej ntawm cov khoom siv cement. Qhov cuam tshuam ntawm HPMC rau kev tuav dej ntawm cov tshuaj khib nyiab.
Nrog rau qhov nce ntawm HPMC cov ntsiab lus, cov dej tuav tus nqi ntawm mortar nce maj mam. Cov nkhaus ntawm hydroxypropyl methylcellulose ether nrog viscosities ntawm 100, 150 thiab 200 Pas yog qhov pib zoo ib yam. Thaum cov ntsiab lus yog 0.05% -0.15%, cov dej tuav tus nqi nce linearly, thiab thaum cov ntsiab lus yog 0.15%, cov dej tuav tau ntau dua 93%. ; Thaum tus nqi ntawm cov grits ntau tshaj 0.20%, qhov nce ntawm cov dej tuav tus nqi yuav tiaj tus, qhia tias tus nqi ntawm HPMC yog ze rau saturation. Lub zog nkhaus ntawm tus nqi ntawm HPMC nrog viscosity ntawm 40 Pa.s ntawm cov dej tuav tus nqi yog kwv yees li ib txoj kab ncaj nraim. Thaum cov nyiaj ntau dua 0.15%, cov dej tuav tus nqi ntawm cov mortar yog qhov qis dua li ntawm peb hom HPMC nrog tib tus nqi ntawm viscosity. Nws feem ntau ntseeg tau tias cov dej tuav cov txheej txheem ntawm cellulose ether yog: pawg hydroxyl ntawm cellulose ether molecule thiab oxygen atom ntawm ether daim ntawv cog lus yuav koom nrog cov dej molecule los tsim ib daim ntawv cog lus hydrogen, kom cov dej dawb ua cov dej khi. , yog li ua si cov dej tuav tau zoo; Nws tseem ntseeg tau hais tias kev sib tshuam ntawm cov dej molecules thiab cellulose ether molecular chains tso cai rau cov dej molecules nkag mus rau sab hauv ntawm cellulose ether macromolecular chains thiab yuav tsum muaj zog binding rog, yog li txhim kho cov dej tuav ntawm cement slurry. Kev tuav dej zoo tuaj yeem ua kom cov mortar homogeneous, tsis yooj yim rau kev sib cais, thiab tau txais kev sib xyaw ua haujlwm zoo, thaum txo cov khoom siv thiab ua rau lub neej ntawm cov tshuaj khib nyiab.
2.2 Cov nyhuv ntawm hydroxypropyl methylcellulose HPMC ntawm qhov ntom thiab cua cov ntsiab lus ntawm cov cement mortar
Thaum tus nqi ntawm HPMC yog 0-0.20%, qhov ceev ntawm mortar txo qis nrog qhov nce ntawm HPMC, los ntawm 2050 kg / m3 txog 1650kg / m3, uas yog li 20% qis dua; Thaum tus nqi ntawm HPMC ntau tshaj 0.20%, qhov ceev yuav txo. hauv siab. Muab piv rau 4 hom HPMC nrog cov viscosities sib txawv, qhov siab dua qhov viscosity, qis dua qhov ntom ntawm cov mortar; Qhov ntom ntom ntawm cov mortars nrog cov viscosities sib xyaw ntawm 150 thiab 200 Pa.s HPMC pib sib tshooj, qhia tias vim tias qhov viscosity ntawm HPMC tseem nce ntxiv, qhov ntom ntom tsis txo.
Txoj cai hloov pauv ntawm huab cua cov ntsiab lus ntawm mortar yog qhov sib txawv rau qhov kev hloov ntawm qhov ntom ntom ntawm mortar. Thaum cov ntsiab lus ntawm hydroxypropyl methylcellulose HPMC yog 0-0.20%, nrog rau kev nce ntawm HPMC cov ntsiab lus, cov ntsiab lus huab cua ntawm mortar nce yuav luag linearly; Cov ntsiab lus ntawm HPMC ntau dua Tom qab 0.20%, cov ntsiab lus huab cua tsis tshua hloov pauv, qhia tau hais tias huab cua nkag los ntawm cov tshuaj khib nyiab yog ze rau saturation. Cov huab cua nkag los ntawm HPMC nrog viscosity ntawm 150 thiab 200 Pa.s yog ntau dua li ntawm HPMC nrog viscosity ntawm 40 thiab 100 Pa.s.
Cov huab cua-entraining nyhuv ntawm cellulose ether yog tsuas yog txiav txim los ntawm nws cov qauv molecular. Cellulose ether muaj ob pawg hydrophilic (hydroxyl, ether) thiab hydrophobic pawg (methyl, qabzib nplhaib), thiab yog surfactant. , muaj kev ua haujlwm saum npoo, yog li muaj cov nyhuv cua-entraining. Ntawm qhov tod tes, cov roj nkag tau tuaj yeem ua raws li lub pob bearing hauv mortar, txhim kho kev ua haujlwm ntawm cov mortar, nce ntim, thiab nce cov zis, uas muaj txiaj ntsig zoo rau cov chaw tsim khoom. Tab sis ntawm qhov tod tes, cov nyhuv huab cua ua rau nce cov ntsiab lus ntawm cov mortar thiab cov porosity tom qab hardening, uas ua rau kom muaj teeb meem pores thiab zoo heev txo cov neeg kho tshuab zog. Txawm hais tias HPMC muaj qee yam huab cua nkag mus, nws tsis tuaj yeem hloov tus neeg saib xyuas huab cua. Tsis tas li ntawd, thaum HPMC thiab air-entraining agent siv tib lub sijhawm, tus neeg saib xyuas huab cua tuaj yeem ua tsis tiav.
2.3 Cov nyhuv ntawm HPMC rau cov khoom siv ntawm cov cement mortar
Thaum tus nqi ntawm HPMC tsuas yog 0.05%, lub zog flexural ntawm mortar txo qis, uas yog li 25% qis dua li ntawm cov qauv dawb paug uas tsis muaj hydroxypropyl methylcellulose HPMC, thiab lub zog compressive tuaj yeem ncav cuag 65% ntawm cov qauv dawb xwb - 80%. Thaum tus nqi ntawm HPMC ntau tshaj 0.20%, qhov txo qis hauv lub zog flexural thiab compressive lub zog ntawm cov mortar tsis pom tseeb. Lub viscosity ntawm HPMC muaj me ntsis cuam tshuam rau cov khoom siv ntawm cov tshuaj khib nyiab. HPMC nthuav qhia ntau cov pa npuas me me, thiab cov cua nkag mus rau hauv cov tshuaj khib nyiab ua rau cov porosity sab hauv thiab qhov tsis zoo ntawm cov mortar, uas ua rau muaj qhov txo qis hauv compressive zog thiab flexural zog. Lwm qhov laj thawj rau qhov txo qis hauv mortar zog yog cov dej tuav cov txiaj ntsig ntawm cellulose ether, uas ua rau cov dej hauv cov tshuaj khib nyiab, thiab cov dej loj-binder piv ua rau txo qis ntawm lub zog ntawm qhov ntsuas ntsuas. Rau cov neeg kho tshuab siv mortar, txawm hais tias cellulose ether tuaj yeem ua rau kom cov dej khaws cia ntawm mortar thiab txhim kho nws txoj haujlwm, yog tias qhov ntau npaum li cas, nws yuav cuam tshuam rau cov khoom siv ntawm cov tshuaj khib nyiab, yog li kev sib raug zoo ntawm ob yuav tsum tau hnyav kom tsim nyog.
Nrog rau qhov nce ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose HPMC, qhov sib piv ntawm cov mortar tau pom ib qho kev nce zuj zus, uas yog qhov kev sib raug zoo. Qhov no yog vim hais tias ntxiv cellulose ether qhia ntau cov huab cua npuas, uas ua rau ntau yam tsis xws luag nyob rau hauv lub mortar, thiab lub compressive zog ntawm daim ntawv qhia sawv mortar txo sharply, tab sis lub flexural zog kuj txo mus rau ib tug tej yam; tab sis cov cellulose ether tuaj yeem txhim kho qhov yooj yim ntawm cov tshuaj khib nyiab, Nws muaj txiaj ntsig zoo rau lub zog flexural, uas ua rau qhov txo qis qis. Xav txog kev nkag siab, qhov sib xyaw ua ke ntawm ob qho tib si ua rau muaj kev nce hauv qhov sib piv.
2.4 Cov nyhuv ntawm HPMC ntawm L txoj kab uas hla ntawm lub mortar
Los ntawm qhov pore loj faib nkhaus, pore loj faib cov ntaub ntawv thiab ntau yam kev txheeb cais ntawm AD cov qauv, nws tuaj yeem pom tias HPMC muaj kev cuam tshuam zoo rau cov qauv pore ntawm cov cement mortar:
(1) Tom qab ntxiv HPMC, qhov pore loj ntawm cov cement mortar nce ntau. Ntawm qhov pore loj faib nkhaus, thaj tsam ntawm daim duab txav mus rau sab xis, thiab qhov pore tus nqi sib raug rau tus nqi ncov yuav loj dua. Tom qab ntxiv HPMC, qhov nruab nrab pore txoj kab uas hla ntawm cov cement mortar yog qhov loj dua li ntawm cov qauv dawb paug, thiab qhov nruab nrab pore txoj kab uas hla ntawm tus qauv nrog 0.3% ntau npaum li cas yog nce los ntawm 2 qhov kev txiav txim siab piv nrog cov qauv dawb paug.
(2) Faib cov pores hauv pob zeb ua rau plaub hom, uas yog qhov tsis zoo pores (≤20 nm), qhov pores tsis zoo (20-100 nm), teeb meem pores (100-200 nm) thiab ntau qhov teeb meem pores (≥200 nm). Nws tuaj yeem pom los ntawm Table 1 tias tus naj npawb ntawm qhov tsis muaj teeb meem lossis qhov tsis txaus siab tsawg dua yog txo qis tom qab ntxiv HPMC, thiab tus naj npawb ntawm qhov teeb meem lossis qhov teeb meem ntau ntxiv. Cov pores uas tsis muaj teeb meem los yog tsis muaj teeb meem tsawg ntawm cov qauv tsis sib xyaw nrog HPMC yog kwv yees li 49.4%. Tom qab ntxiv HPMC, cov pores uas tsis muaj teeb meem lossis tsis muaj teeb meem tsawg dua qhov pores raug txo qis. Noj cov koob tshuaj ntawm 0.1% ua piv txwv, cov pores tsis muaj teeb meem los yog qhov tsis zoo pores raug txo los ntawm 45%. %, tus naj npawb ntawm qhov teeb meem loj dua 10um tau nce li ntawm 9 npaug.
(3) Qhov nruab nrab pore txoj kab uas hla, qhov nruab nrab pore txoj kab uas hla, qhov pore ntim tshwj xeeb thiab thaj chaw tshwj xeeb tsis ua raws li txoj cai hloov nruj heev nrog rau qhov nce ntawm hydroxypropyl methylcellulose HPMC cov ntsiab lus, uas tej zaum yuav muaj feem xyuam rau cov qauv xaiv hauv kev txhaj tshuaj mercury. muaj feem xyuam rau loj dispersion. Tab sis ntawm tag nrho, qhov nruab nrab pore txoj kab uas hla, qhov nruab nrab pore txoj kab uas hla thiab qhov pore ntim ntawm cov qauv sib xyaw nrog HPMC zoo li nce piv nrog cov qauv dawb paug, thaum qhov tshwj xeeb ntawm qhov chaw txo qis.
Post lub sij hawm: Apr-03-2023