Calcium nitrate, ib qho compound nrog cov tshuaj noj CA (NOT₃) ₂, ua lub luag haujlwm tseem ceeb hauv kev thev naus laus zis. Nws cov ntawv thov hauv cov pob zeb muaj peev xwm nqa tau txog ntau yam, cuam tshuam cov khoom thiab kev ua tau zoo ntawm cov pob zeb ua ntau yam. Kab lus no yuav delve rau hauv cov kev cuam tshuam tshwj xeeb ntawm calcium nitrate ntawm pob zeb los ntawm ob peb txoj kev xav tseem ceeb.
Ua kom muaj hardening thiab txhim kho lub zog thaum ntxov
Ib qho ntawm feem ntau prom
inencov kab ke ntawm calcium nitrateHauv kev ua vaj tse yog nws lub peev xwm los ua kom nrawm dua cov txheej txheem tawv tawv thiab txhim kho lub zog thaum ntxov ntawm kev ua vaj tse. Cov pob zeb ua lub zog los ntawm kev ua haujlwm ntawm cov txiv neej dej xis ntawm cov cement, uas yog cov tshuaj txheem nyuaj. Calcium nitrate tuaj yeem ua raws li tus nrawm hauv tus txheej txheem no.
Thaum calcium nitrate yog ntxiv rau cov pob zeb sib tov, nws cais tawm rau hauv calcium ions (caov) thiab nitrate ions (tsis muaj aqueous. Cov calcium ions tuaj yeem nce cov calcium hauv cov pa taws kev daws ntawm cov pob zeb. Qhov no siab dua calcium ion concotes txhawb nqa lub nucleation thiab kev loj hlob ntawm cov dej cawv xws li calcium silicate dej (CCAs thiab calcium ₂). Raws li qhov tshwm sim, kev tsim cov khoom lag luam chocolate tau nrawm, ua rau kev txhim kho sai ntawm cov qhob cov qauv txheej txheem.
Nyob rau hauv thaum ntxov theem ntawm cov qhob ntsej muag, feem ntau nyob rau hauv thawj ob peb hnub, ntxiv rau Calcium nitrate tuaj yeem ua kom luv luv lub sijhawm. Qhov no txhais tau tias cov pob zeb sib txuas los ntawm lub xeev yas los rau lub xeev rigid ntau sai dua, uas yog qhov tshwj xeeb hauv kev tsim kho qhov chaw uas lub sijhawm yog qhov tseem ceeb. Piv txwv li, hauv kev kho hauv kev kev tsheb lossis kev tsim kho choj, tau txo qis lub sijhawm sijhawm tuaj yeem txo cov tsheb sib cuam tshuam thiab txhim kho kev ua haujlwm tau zoo.
Ntxiv mus, lub zog txhim kho thaum ntxov calcium nitrate tso cai rau cov pob zeb ua kom cov chaw thau khoom ua ntej. Qhov no yog qhov tseem ceeb heev nyob rau hauv cov xwm txheej uas cov kev xav tau tawm los yog thaum tus qauv yuav tsum tau muab tso rau hauv ib theem pib. Cov kev tshawb fawb tau pom tias ntxiv cov calcium nitrate uas tsim nyog tuaj yeem ua kom muaj lub zog thaum ntxov los ntawm cov khoom siv nrawm dua, nyob ntawm seb yam twg, thiab kev kho mob.
Txawm li cas los xij, nws yog ib qho tseem ceeb kom nco ntsoov tias thaum calcium nitrate kev txhim kho thaum ntxov lub zog, nws nyhuv rau lub zog kawg ntawm cov pob zeb ua tsis ncaj. Hauv qee kis, ntau dhau ntawm calcium nitrate yuav ua rau muaj kev txo me ntsis, raws li kev ua kom nrawm dua ntawm cov khoom lag luam ntawm cov dej nyab xeeb me me yuav ua rau muaj teeb meem me me nyob hauv lub sijhawm ntev. Yog li no, kev tswj hwm kev tsim nyog yog qhov tseem ceeb kom ua tiav qhov kev xav tau ntawm qhov kev xav tau ntawm lub zog thaum ntxov thiab kev ua haujlwm ntev.
Anti - khov thiab tiv thaiv kev puas tsuaj te
Cov pob zeb ua yog qhov raug ua rau muaj kev puas tsuaj te thaum muaj qhov txias txias thaum lub sij hawm kho tus txheej txheem. Qhov khov ntawm cov dej hauv cov pob zeb ua kom muaj peev xwm nthuav dav, ua rau kev tsim cov kab nrib pleb thiab kev tsis zoo ntawm cov qauv ua vaj tse. Calcium nitrate tuaj yeem ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv xws li ua yeeb yam los ntawm anti - khov tus neeg sawv cev.
Lub nitrateions hauv calcium nitrate muaj cov cuab yeej ntawm kev txo qis qhov taw tes khov ntawm cov kev daws teeb meem hauv cov pob zeb ua. Thaum calcium nitrate yog ntxiv, nws kev ntxhov siab rau qhov chaw khov ntawm cov dej muaj txiv laum, txo qhov ua kom muaj dej khov ntawm cov dej khov tsawg. Qhov no tso cai rau cov pob zeb ua kom kho tau ib txwm txawm tias huab cua huab cua txias, raws li cov tshuaj tiv thaiv dej txias tuaj yeem txuas ntxiv yam tsis muaj qhov khov ntawm cov dej.
Nyob rau hauv cov cheeb tsam txias lossis thaum siv calcium nitrate ua ib qho anti - khov admixture tuaj yeem txhim kho lub zog ua haujlwm thaum lub sijhawm kho cov theem thaum ntxov. It helps to ensure that the concrete reaches a sufficient level of strength before being exposed to severe freezing conditions, thereby minimizing the risk of frost damage.
Txawm li cas los xij, kev ua tau zoo ntawm calcium nitrate ua ib qho anti - tus neeg sawv cev khov tseem nyob ntawm cov tshuaj thiab ntsuas kub. Thaum tsis tshua muaj kub heev, txawm tias muaj kev sib ntxiv ntawm calcium nitrate, ntawm khov taw tes kev nyuaj siab yuav tsis muaj txaus los tiv thaiv txhua yam dej los ntawm khov. Nyob rau hauv cov xwm txheej zoo li no, kev ntsuas ntxiv xws li cua sov lossis siv lwm hom kev tiv thaiv antitures hauv kev sib xyaw nrog calcium nitrate yuav tsum tau.
Txhim Kho Durability
Lub sijhawm ruaj khov yog qhov tseem ceeb hauv kev pabcuam lub neej ntawm cov vaj tse. Calcium nitrate tuaj yeem pab txhawb kom txhim kho lub zog ntawm cov pob zeb hauv ntau txoj kev.
Ua ntej, raws li tau hais ua ntej lawm, calcium nitrate ua kom nrawm dua cov txheej txheem hydration, ua rau kev tsim cov metertration micrettructure nyob rau thaum ntxov. Denser microstructure txo lub permeability ntawm cov pob zeb ua kom tsis txhob muaj kev phom sij xws li chlorides, thiab carbon dioxide. Txo cov permeability tuaj yeem ncua qhov pib ntawm corrosion ntawm kev txhawb nqa steel thiab tshuaj lom neeg tawm tsam rau ntawm cov pob zeb ua kom zoo dua ntawm cov qauv.
Thib ob, nitrate ions hauv calcium nitrate tau pom tias muaj cov nyhuv tiv thaiv ntawm kev txhawb nqa steel hauv pob zeb. Nyob rau hauv muaj cov kab chlorides, uas yog qhov tseem ceeb ua rau muaj cov hlau corrosion, nitrate ions tuaj yeem ua raws li tus neeg pleev xim oxidizing thiab pab tswj cov zaj duab xis nyob saum npoo ntawm cov hlau. Zaj duab xis passive yog qhov tseem ceeb rau kev tiv thaiv corrosion. Los ntawm kev ua yeeb yaj kiab passive, calcium nitrate, txawm tias nyob rau hauv ib puag ncig kev txhawb nqa cov hlau lossis thaj chaw uas de - iCing salts yog siv.
Tsis tas li ntawd, calcium nitrate kuj tseem tuaj yeem txhim kho cov pob zeb ua rau lwm hom kev ua kom tsis zoo, xws li Alkali - kev sib sau ua ke (AAR). AAR yog tshuaj lom neeg ntawm Alkali hauv cov Maas muab tshuaj pleev thiab qee yam kev sib tw ua kom muaj zog, uas tuaj yeem ua rau nthuav dav thiab tawg ntawm cov pob zeb. Txawm hais tias calcium nitrate tsis yog ib tug ncaj qha inhibitor ntawm aar, lub denser microstructure tsim los ntawm noo noo thiab alkalis, yog li mitigating loj ntawm cov tshuaj tiv thaiv.
Lwm Qhov Teeb Meem
Ntxiv rau cov kev cuam tshuam saum toj no, calcium nitrate kuj tseem muaj qee lwm lwm yam cuam tshuam rau hauv av.
Piv txwv li, nws tuaj yeem txhim kho cov haujlwm ntawm cov pob zeb sib xyaw rau qee yam. Qhov kev sib cais ntawm calcium nitrate hauv dej tuaj yeem muab qee cov nyhuv muaj qee cov txiaj ntsig, ua cov qhob ua kom dej ntau dua thiab yooj yim dua.
Txawm li cas los xij, muaj cov txiaj ntsig ntawm calcium nitrate ntawm kev ua haujlwm yog qhov tsis muaj tsawg piv rau lwm hom admixtures xws li superplasticizers. Yog li ntawd, feem ntau, calcium nitrate yog siv nyob rau hauv kev sib xyaw nrog lwm tus admixtures kom ua tiav qhov kev ua haujlwm xav tau thiab lwm yam kev ua tau zooyuav tsum tau.
Lwm qhov yog cov calcium nitrate yog dej - soluble sib xyaw, thiab nws ntxiv tsis qhia cov kev cuam tshuam rau cov pob zeb. Qhov no ua rau nws muaj kev nyab xeeb thiab ib puag ncig tus phooj ywg piv piv rau qee lwm hom kev nrawm lossis cov tshuaj lom neeg uas yuav muaj cov tshuaj lom lossis phom sij.
Kev txiav txim siab rau kev thov
Thaum calcium nitrate muaj cov txiaj ntsig ntau rau kev ua vaj tse, muaj ntau qhov kev txiav txim siab tseem ceeb kom nco ntsoov thaum siv nws hauv txoj haujlwm tsim kho.
Ntsej Muag Kev Tswj Xyuas
Raws li tau hais ua ntej, cov tshuaj ntawm calcium nitrate yog qhov tseem ceeb heev. Ntau ntau ntau ntxiv yuav ua rau cov teebmeem tsis zoo xws li txo qis kawg lub zog, nce shrinkage, thiab txawm tias corrosion ntawm kev txhawb nqa hlau hauv qee kis. Qhov kev ua tau zoo ntawm ntau yam nyob ntawm ntau yam, suav nrog hom thiab hom Maas, cov yam ntxwv ntawm lub zog thaum ntxov, thiab kev kho mob. Nws raug nquahu kom coj mus ua kev kuaj mob lossis ua raws cov lus qhia los ntawm cov lus qhia admixtisure los txiav txim siab qhov tsim nyog muab rau ib qhov project tshwj xeeb.
Compatibility nrog lwm Admixtures
Calcium nitrate yuav cuam tshuam nrog lwm admixtures siv nyob rau hauv cov qhob sib tov, xws li superplasticizers, huab cua - entraining cov neeg sawv cev, thiab tus retarders. Nws yog qhov tseem ceeb kom ntseeg tau tias cov admixtures sib txuam nrog txhua lwm yam kom tsis txhob muaj kev cuam tshuam tsis zoo ntawm cov pob zeb ua cov khoom siv. Piv txwv li, qee tus superplasticizers yuav muaj cov nyhuv retarding, uas tuaj yeem tiv thaiv kev nrawm nrawm ntawm calcium nitrate. Yog li no, kev ntsuas kom tsim nyog yuav tsum tau nqa tawm ua ntej loj teev.
Kho cov mob
Txawm hais tias calcium nitrate tuaj yeem txhim kho kev ua tau zoo ntawm cov pob zeb txias, cov kev kho mob kom zoo tseem ceeb rau cov pob zeb txhua yam. Kev tswj kom muaj dej noo txaus thiab ntsuas kub thaum lub sijhawm kho tau yog qhov tsim nyog los xyuas kom meej li co lasry thiab kev txhim kho ntawm cov khoom xav tau. Nyob rau hauv huab cua kub, piv txwv li, kev ntsuas xws li kev kho dej noo lossis siv tshuaj kho kom muaj kev sib txuas lus ntau dhau ntawm cov dej evaporate thiab tawg ntawm cov pob zeb.
Ib puag ncig thiab kev txiav txim siab nyab xeeb
Calcium nitrate yog qhov tsis yog - tshuaj lom neeg sib xyaw, tab sis nws yog oxidizer muaj zog. Yog li ntawd, nws yuav tsum tau muab khaws cia thiab muab nrog tu kom tsis txhob sib cuag nrog cov ntaub ntawv organic lossis txo cov neeg sawv cev, uas muaj kev phom sij lossis tawg. Ib qho ntxiv, los ntawm ib puag ncig lub laj kev, txawm hais tias muaj kev nyab xeeb zoo, nws yog qhov tsis zoo rau cov dej tsis zoo rau lub neej muaj sia thiab tib neeg kev noj qab haus huv.
Tag
Calcium nitrate yog ib qho kev zoo nkauj admixture uas tuaj yeem muaj cov kev cuam tshuam loj ntawm kev ua vaj tse. Nws ua kom nrawm dua cov txheej txheem tawv, muab cov khoom tiv thaiv thaum ntxov, muab cov khoom khov kho no, txhim kho kev puas tsuaj, thiab muaj qee qhov zoo ntawm kev ua haujlwm. Txawm li cas los xij, nws daim ntawv thov kev vam meej yuav tsum tau ua tib zoo saib xyuas kev tswj cov tshuaj ntau, kev kho nrog lwm tus admixtures, thiab ib puag ncig thiab kev muaj kev nyab xeeb.
Los ntawm kev nkag siab ntawm cov txheej txheem hauv qab calcium nitrate ntawm cov chaw tsim khoom, tshwj xeeb yog cov huab cua sib tw xws li cov huab cua nyuaj lossis cov uas muaj kev xav tau siab. Raws li kev tsim kho kev tsim kho txuas ntxiv mus hloov kho ntawm Inmixtures xws li calcium nitrate txoj haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo, zoo, kev ruaj khov ntawm pob zeb ua qauv.