Hnub Tim: 3, Sep, 2024

7. Tus neeg muab kev sib xyaw ua ke thiab sib xyaw ua kom nrawm

Lub sijhawm sib xyaw muaj qhov cuam tshuam ncaj qha rau cov ntsiab lus ntawm pob zeb ua kom zoo nkauj, thiab tsis ncaj rau cov khoom ua haujlwm, cov khoom siv txhua yam thiab ruaj khov ntawm pob zeb. Yog tias cov tov khoom khiav nrawm nrawm, nws yooj yim los ua kom cov qauv sib xyaw ua ke ntawm cov xis thiab ob npaug hluav taws xob ua rau lub sijhawm thiab txo qis ntawm cov pob zeb ua kom zoo. Qhov sib xyaw ua ke yuav tsum tau tswj tsis pub dhau 1.5-3 feeb. Yog tias cov txheej txheem sib tov qhuav yog siv, cov pob zeb ua tau sib xyaw kom dawb huv los ntawm kev siv dej txo cov dej. Yog tias txoj kev daws teeb meem yuav tsum tau ntxiv, cov dej yuav tsum tau txiav tawm los ntawm kev sib xyaw thaum lub sij hawm rediguration ntawm dej reducer kom ntseeg tau tias qhov kev tsim qauv dej-CEMENT piv. Txhawm rau kom ntseeg tau cov pob zeb ntawm cov pob zeb ua kom zoo nkauj rau lub luag haujlwm ntawm dej reducer, cov qauv tom qab sib xyaw tuaj yeem siv ncaj qha. Txawv los ntawm cov dej ntws loj-efficiency reducer ntxiv cov qauv, qhov yooj yim ntawm kev sib xyaw ntawm cov pob zeb ua tau kom ua tau zoo los ntawm kev siv cov qauv tom qab sib xyaw. Yog tias lub tsheb tov khoom yog xav tau los thauj cov qhob ua, cov dej ntws tawm tuaj yeem txuas ntxiv rau cov khoom siv nrawm nrawm thiab txhim kho cov nyhuv tawm.

8. Kev cuam tshuam ntawm qhov kub ambient kub thiab vaum

Lub sijhawm teeb tsa, hardening ceev thiab thaum ntxov lub zog ntawm pob zeb ua cov sib xyaw ncaj qha cuam tshuam nrog kev kho qhov kub. Tom qab ntxiv dej reducer, qhov tshwm sim no yog qhov pom tseeb, thiab cov nyhuv yuav yog qhov tseem ceeb dua thaum lub sijhawm teeb tsa nyob qis dua 20 degrees Celsius. Feem ntau hais lus, qhov ntsuas kub siab dua, nrawm dua ntawm txoj kev hloov ntawm cov neeg hauv av yooj yim dua ntawm cov pob zeb ua. Cov dej dawb hauv cov pob zeb ua yuav txuas ntxiv rau cov qhob nroo saum npoo av los ntawm capillary, ntxiv nrawm cov hydration nyhuv ntawm cov cement. Cov dej pub dawb hauv cov pob zeb ua yog evaporated thiab txo, uas ua rau muaj qhov ua rau poob qis ntawm cov pob zeb poob. Tsis tas li ntawd, cov nyhuv retarding ntawm qee cov pob zeb ua kom zoo nkauj yuav tau txo qis dua 30 degrees Celsius. Yog li ntawd, yog tias nws yog qhov tsim nyog los ua haujlwm nyob rau hauv ib puag ncig cua sov, nws yog ib qho tsim nyog los ua kom muaj cov pob zeb ua kom muaj txiaj ntsig ntawm cov dej evaporation. Ntoo calcium muaj qee yam kev hloov tsheb qeeb. Nws tsuas tuaj yeem muaj qee yam qauv txheej txheem lub zog tom qab pouring ntev. Thaum lub sijhawm saib xyuas kev ua haujlwm, nws yog ib qho tsim nyog los txuas lub sijhawm nres zoo li tsis txaus thiab kev tshawb fawb ntau npaum li cas. Txwv tsis pub, cov pob zeb ua yog qhov hnyav rau cov kab nrib pleb, kev xoob kom zoo nkauj thaum siv sijhawm. Nyob rau hauv cov txheej txheem ntawm kev siv cov redriciency high-efficiency reducer, vim tias cov nyhuv huab cua tsis muaj peev xwm tsis tuaj yeem lav, thiab ntev heev ntev li lub sijhawm nres tsheb. Yog li ntawd, nyob rau hauv tus txheej txheem ntawm ntxiv cov kev ua haujlwm admixtures, ua haujlwm cuam tshuam yuav tsum tau ua tib zoo kom tsis txhob muaj dej loj heev thaum lub sijhawm tswj xyuas.

9. Maas Rooj tog

Nyob rau hauv ib txwm muaj xwm txheej, luv luv lub sijhawm cia ntawm xis mas, tus fresher nws yuav tshwm sim, thiab qhov tsis zoo ntawm cov txiaj ntsig zoo ntawm cov cement yuav yog. Fresher cov cement, qhov muaj zog dua tus nqi zoo, thiab muaj ionic surfactants nws adsorbs. Rau cov cement uas nyuam qhuav tau ua tiav, nws cov dej txo qis yog tsawg thiab poob qis yog nrawm. Rau cov cement nrog lub sijhawm ntev ntev, cov teeb meem no tuaj yeem zam tau zoo.

10. Alkali cov ntsiab lus hauv Maas

Cov ntsiab lus Alkali tseem muaj qhov cuam tshuam ncaj qha rau kev yoog raws li cov cement thiab reducer. Raws li cov alkali cov ntsiab lus ntawm Caas nce, cov txiaj ntsig zoo ntawm cov cement yuav tsis zoo. Thaum cov Alkali cov ntsiab lus ntau dua ib qho kev tshaj tawm, nws kuj tseem muaj kev cuam tshuam loj heev rau kev teeb tsa lub sijhawm thiab cov cement. Tsis tas li ntawd, daim ntawv ntawm alkali hauv xis mas muaj qhov cuam tshuam ncaj qha rau kev siv cov kev siv hluav taws xob. Nyob rau hauv ib txwm muaj xwm txheej, yog tias cov alkali tshwm sim nyob rau hauv daim ntawv ntawm sulfate, nws nyhuv rau dej reducer yog tsawg dua uas nyob rau hauv daim ntawv ntawm hydroxide.

11. Gypsum hauv Maas

Los ntawm kev ntxiv cov cement gysum rau cov cement, kos cov roj xis tuaj yeem zam tau, yog li txhim kho cov pa roj xis ntawm cov txiv neej xis thiab reducer. Raws li cov kev tshawb fawb ntau, tom qab ntxiv qee qhov ntawm Gypsum kom cement, cov adsorption ntawm dej reducer ntawm cov Maas pob zeb hauv C3A tuaj yeem txo qis. Qhov no feem ntau yog vim tias gypsum thiab c3A tuaj yeem cuam tshuam los ua cov calcium sulfonate, uas yuav tsis muaj zog tshaj plaws ntawm C3A, uas yuav muaj zog tshaj plaws ntawm C3A, uas tuaj yeem tiv thaiv ntxiv ntawm C3A hais rau dej Reducer. Txawv ntau hom Gypsum muaj cov kev sib txawv sib txawv thiab cov solubility. Hom thiab cov ntsiab lus ntawm Maas Gypsum muaj qhov cuam tshuam ncaj qha rau kev yoog raws li cov txiv neej thiab dej reducer. Lub pore kua sulfate nyob rau hauv xis mas cov txiv ntoo tsim los ntawm cov cement coasing, uas yuav muaj kev ua haujlwm ntawm cov cement. Lub sulfate ions hauv gypsum feem ntau tau raug hloov sib txawv thaum lub sijhawm sib tsoo. Yog tias qhov kub ntawm cov txheej txheem sib tsoo yog qhov siab, tus thawj gypsum yuav yog ib nrab lub cev qhuav thiab daim ntawv hemihydrate gypsum. Yog tias qhov ntsuas kub nyob sab hauv lub zeb yog ntau dhau, muaj ntau ntawm Hemihydrate Gypsum yuav tau tsim nyob rau hauv cov txheej txheem no, uas yuav muaj thaum kawg coj mus rau qhov kev tshwm sim ntawm Maas pseudo-teeb tsa. Rau cov cement nrog tsawg alkaline cov alkaline sulfate Cheebtsam, nyob rau hauv sulfonic acid-based dej reducers, nws yuav ncaj qha rau cov pob zeb ua kom sai. Thaum lub suluble sulfate cov ntsiab lus nce, cov adsorption ntawm cov dej ntws loj-efficiency reducers yuav qhia ib tug quasi-linear downward qauv.

12. Maas sib tsoo cov kev sib tsoo

Cov kev sib tsoo Maas ua tau zoo tuaj yeem txhim kho los ntawm kev siv cov cement sib tsoo AIDS tsim nyog. Nyob rau hauv cov txheej txheem ntawm cov cement ntau lawm hauv ntau lub tuam txhab canent cement, sib tsoo cov AIDS feem ntau yog siv hauv cov khoom loj. Nyob rau hauv xyoo tsis ntev los no, tom qab kev siv cov qauv ua kom tshiab hauv kuv lub tebchaws, cov kev cai kom tau zoo dua qub rau kev siv cov kev sib tsoo ntawm AIDS. Tam sim no, muaj ntau hom kev sib tsoo cov kev sib tsoo, thiab cov naj npawb ntawm kev sib tsoo pab cov neeg lag luam hauv kuv lub teb chaws kuj tseem pom tias muaj kev nce qib txuas ntxiv. Ntau txoj kev sib tsoo cement cov khoom lag luam tau nqis peev txuas ntxiv hauv kev tshawb fawb thiab kev txhim kho kev lag luam, siv tau yooj yim thiab yooj yim thiab siv tau yooj yim pab. Txawm li cas los xij, qee qhov kev sib tsoo kev sib tsoo cov lag luam tau them nyiaj ntau dhau ntawm cov nqi kev sib tsoo, uas muaj cov khoom siv harogen halogen zoo li yuav ua rau muaj kev mob corrosion ntawm cov hlau tuav sab hauv pob zeb ua. Siv cov teeb meem dhau dhau ntawm qhov teeb meem loj ntawm kev tsis sib xws ntawm cov cement thiab pob zeb ua. ③ Txhawm rau kom zoo txo ​​cov nqi ntau lawm, muaj ntau ntau ntawm cov khib nyiab feem ntau siv, uas muaj cov phom sij txaus ntshai heev ntawm cov pob zeb tsis zoo. Nyob rau hauv cov txheej txheem tam sim no ntau lawm, lub alkali thiab chloride ion cov ntsiab lus, thiab clinker cov ntsiab lus, thiab clinker cov zaub mov muaj qhov cuam tshuam ncaj qha rau kev faib cov CIAS nkaus. Nyob rau hauv kev siv cov kev sib tsoo cov kev sib tsoo, lub zog tsis tau ntawm xis mas yuav tsis tau kev txi. Qhov sib xyaw ua ke ntawm kev sib tsoo cov pab cuam tshuam yog cov nyom. Tsuas yog siv cov kev sib tsoo AIDS tsim nyog tuaj yeem cov nyhuv ntawm pob zeb ua tau. Thaum lub sijhawm cov txheej txheem ntau lawm, kev sib tsoo cov khoom lag luam pabcuam yuav tsum muaj kev nkag siab zoo ntawm lub tuam txhab sib tsoo, thiab ua tus tswv ntawm kev sib tsoo cov kev sib tsoo thiab cov Maas paltle mending.

13. Kev tsim kho sib xyaw

Cov kev tsim kho sib xyaw sib piv rau cov teeb meem tsim qauv engineering, tab sis nws muaj qhov cuam tshuam ncaj qha rau kev sib raug zoo ntawm cov pob zeb ua khoom yoog thiab xis mas. Raws li cov ntaub ntawv muaj feem cuam tshuam, yog tias cov xuab zeb piv yog siab dhau, nws yog qhov yooj yim los ua kom muaj kev sib haum xeeb ntawm cov pob zeb sib xyaw kom tsawg dua, thiab poob qis heev. Tsis tas li ntawd, cov duab nqus dej thiab cov qhab nia ntawm cov pob zeb ua kom sib piv, kev siv dej, fircability thiab muaj cov khoom siv rau ib qho. Cov kev sim cuam tshuam qhia tau tias los ntawm kev txo cov dej-Maas piv, lub zog ntawm cov pob zeb ua tau zoo tuaj yeem hloov kho rau qee yam. Nyob rau hauv cov xwm txheej ntawm kev ua dej tau zoo, ntau yam ntawm cov xis kawm tuaj yeem raug lees paub, thiab ua tiav ntawm Insixtures thiab xis mas tuaj yeem txhim kho.