Ob Qhov Phenomena ntawm Cov Khoom Siv Hluav Taws Xob Hluav Taws Xob thiab Kev Tiv Thaiv
Dec 26, 2024
Dej reducers, feem ntau anionic surfactants, feem ntau yog siv hauv kev lag luam pob zeb. Cov hom muaj xws li polycarboxylate-based thiab naphthalene-raws li dej reducers. Cov additives no txo cov dej-cement piv, tswj cov pob zeb tawg thaum txhim kho lub zog, txo cov kab nrib pleb, thiab txhim kho pob zeb ua haujlwm. Txawm li cas los xij, yam xws li cov khoom siv tsis zoo thiab cov neeg ua haujlwm tsis txaus ntseeg tuaj yeem ua rau muaj ntau yam teeb meem hauv kev sib xyaw ua ke nrog cov dej txo qis. Hauv qab no yog ob qho xwm txheej thiab lawv cov kev daws teeb meem:
1. Caking Phenomenon
Txhais:
Lub caking tshwm sim yog hais txog ib nrab adhesion ntawm cement paste rau sab hauv phab ntsa ntawm lub nruas sib tov, ua rau cov pob zeb tsis sib xws, tsis tshua muaj teeb meem grey, thiab cov nplaum sib xws. Qhov teeb meem no tsis tsuas yog cuam tshuam rau kev ua vaj tse zoo xwb tab sis kuj tuaj yeem ua rau cov nqi tu thiab txo cov khoom siv tau zoo.
Ua rau Analysis:
Action Mechanism ntawm Retarding Water Reducers: Retarding water reducers ho txo cov dej-cement piv thiab txhim khu lub fluidity ntawm cov pob zeb. Txawm li cas los xij, lawv kuj hloov lub cev thiab tshuaj lom neeg ntawm cov khoom sib xyaw. Qee qhov xwm txheej, cov kev hloov pauv no ua rau muaj cov kua nplaum nplaum hauv cov khoom sib tov, uas tom qab ntawd ua raws li lub nruas phab ntsa.
Mixer Hom thiab Axial Ratio: Nruas mixers nrog qhov sib piv axial sib xyaw muaj qhov sib xyaw ua haujlwm qis, uas ua rau lub sijhawm khaws cia ntev dua ntawm kev sib xyaw thiab ua rau muaj qhov tshwm sim ntawm kev sib xyaw. Forced mixers, ntawm qhov tod tes, muab kev sib xyaw kom muaj zog thiab ua haujlwm ntau dua, txo qhov tshwm sim ntawm caking.
Kev sib xyaw ua ke thiab txheej txheem: Kev sib xyaw ua ke tsis raug thiab cov txheej txheem kuj yog qhov tseem ceeb. Piv txwv li, ntxiv cov dej reducer ntxov dhau tuaj yeem ua rau nws hnov mob nrog cov cement ua ntej, ua cov khoom nplaum uas ua rau lub nruas phab ntsa.
Kev tiv thaiv:
Kev tu lub sijhawm ntawm cov khoom sib tov: Tom qab txhua qhov sib tov, ntxuav lub nruas phab ntsa thiab cov hniav sib xyaw kom tsis txhob muaj cov khoom seem uas tuaj yeem cuam tshuam kev sib xyaw yav tom ntej.
Optimizing cov txheej txheem sib tov: Hloov qhov kev txiav txim sib xyaw. Ua ntej, ntxiv cov aggregates thiab qee cov dej rau kev sib xyaw ua ntej, kom ntseeg tau tias cov aggregates zoo ntub thiab tawg. Tom qab ntawd, maj mam qhia cov cement, cov dej seem, thiab cov dej reducer. Qhov no yuav pab txo tau lub sij hawm sib cuag ncaj qha ntawm cov dej reducer thiab cov cement, txo cov khoom nplaum.
Kev siv cov khoom sib xyaw tsim nyog: Xav txog kev hloov lub nruas tov nrog ib qho uas muaj qhov loj dua axial piv, los yog hloov mus rau ib qho kev sib tov rau kev sib xyaw kom zoo dua.
Kho qhov sib xyaw ua ke: Txhim kho qhov sib xyaw ntawm cov cement, dej, aggregates, thiab cov khoom siv ntxiv los txhim kho kev ua haujlwm thiab kev ntws ntawm cov pob zeb, yog li txo cov khoom nplaum tsim.
Kev Tswj Xyuas Zoo: Txhim khu kev tswj kom zoo thaum lub sij hawm sib xyaw ua ke los ntawm kev tshawb xyuas qhov xwm txheej ntawm cov khoom sib tov thiab qhov zoo ntawm cov pob zeb sib tov, ua kom ruaj khov.
2. False Setting Phenomenon
Txhais:
Kev teeb tsa tsis raug yog hais txog qhov tshwm sim uas cov pob zeb poob nws qhov kev ua haujlwm sai sai thaum sib xyaw, thiab nws qhov chaw zoo li teeb, txawm tias nws tsis tau ua tiav rau sab hauv. Qhov xwm txheej no feem ntau yog nrog los ntawm kev nce ntxiv hauv viscosity, uas tuaj yeem ua rau muaj kev sib xyaw nyuaj thiab txawm tias caking, cuam tshuam loj heev rau kev tsim khoom thiab kev ua haujlwm zoo.
Ua rau Analysis:
Cement Chemistry: Thaum cov gypsum (calcium sulfate) cov ntsiab lus hauv cov cement tsis txaus, cov hydration ntawm calcium aluminate accelerates, ua rau pob zeb poob nws flowability sai heev thiab tsim qhov teeb meem tsis tseeb. Gypsum tswj cov hydration ceev ntawm calcium aluminate, tiv thaiv nws los ntawm reacting sai heev.
Incompatibility nrog cov dej Reducer: Ntau hom cement thiab hom muaj qhov sib txawv ntawm kev sib raug zoo nrog cov dej txo qis. Yog tias cov dej txo qis tsis sib haum nrog cov cement siv, nws yuav tsis ua kom zoo, ua rau qhov tshwm sim tsis tseeb.
Ntau Cov Tshuaj Ntxiv Ntxiv: Kev noj ntau dhau ntawm qee yam tshuaj ntxiv (piv txwv li, triethanolamine) tuaj yeem ua rau muaj qhov teeb meem ntxov ntxov yam tsis muaj kev ua kom tiav, ua rau muaj qhov tsis tseeb.
Kev tiv thaiv:
Hloov Cement Hom: Yog tias cov cement tam sim no ua rau qhov teeb meem tsis tseeb, xav txog kev hloov mus rau lwm hom lossis hom nrog cov ntsiab lus gypsum haum thiab zoo sib xws nrog cov dej reducer.
Kho Cov Txheej Txheem Ntxiv: Hloov kho cov txheej txheem ntxiv los ntawm kev hloov hom lossis ntau npaum li cas ntawm cov dej reducer lossis ua cov txheej txheem sib xyaw ua ke los txhim kho kev sib raug zoo ntawm cov additive thiab cement, txo qhov kev pheej hmoo ntawm kev teeb tsa tsis raug.
Ntxiv nrog Sodium Sulfate: Ntxiv sodium sulfate (Na₂SO₄) hauv cov tshuaj ntxiv tuaj yeem tswj cov dej nrawm ntawm calcium aluminate, tiv thaiv kev ua ntej ntxov uas ua rau muaj qhov tsis tseeb. Tsis tas li ntawd, sodium sulfate tuaj yeem txhim kho lub zog thiab kav ntev ntawm cov pob zeb.
Txhim khu kev tswj kev sib xyaw: Saib xyuas thiab tswj cov txheej txheem sib xyaw kom nruj, ua kom lub sijhawm sib xyaw, nrawm, thiab lwm yam tsis raug raws li cov qauv kev qhia tshwj xeeb. Tsis tas li ntawd, tsis tu ncua ntxuav thiab tswj cov khoom sib tov kom tsis txhob muaj cov khoom seem los ntawm kev cuam tshuam cov khoom sib xyaw tom ntej.
Optimize pob zeb sib xyaw: Kho qhov sib xyaw tsim, suav nrog qhov sib piv ntawm cov dej-cement thiab cov ntsiab lus cement, tuaj yeem txhim kho kev ua haujlwm thiab kev ntws ntawm cov pob zeb, txo cov kev pheej hmoo ntawm kev teeb tsa tsis raug thiab txhim kho tag nrho cov khoom zoo.
Los ntawm kev daws cov teeb meem no-caking thiab teeb tsa tsis tseeb-los ntawm cov tswv yim hais txog, kev ua tau zoo thiab kev ua haujlwm ntawm cov pob zeb ua tau zoo tuaj yeem txhim kho tau zoo, ua rau kev ua haujlwm zoo dua thiab kev cuam tshuam tsawg dua.
