Vim li cas thiaj siv Shotcrete yam tsis tau txo cov kua Accelerating Agent khoom?

Vim li cas thiaj siv Shotcrete yam tsis tau txo cov kua ua kom cov khoom lag luam?

iquid Low-alkali Rapid-setting Agent for Concrete Construction
Cov kua qaub qis-alkali ceev-teeb tus neeg saib xyuas yog cov tshuaj ntxiv uas tuaj yeem ua kom cov cement, mortar, lossis pob zeb sai sai yam tsis muaj kev cuam tshuam rau lawv lub zog mus ntev. Cov neeg ua hauj lwm ceev ceev tuaj yeem muab tau rau hauv cov hmoov los yog kua daim ntawv thiab tuaj yeem muab faib ua alkaline thiab qis-alkali raws li lawv cov kua qaub-puag zog.
Kev ua haujlwm ntub dej tau dhau los ua nrov hauv kev tsim kho engineering kom txo qis cov plua plav thiab txo kev puas tsuaj rau cov neeg ua haujlwm tsim kho, nrog rau txo qis tus nqi rov qab ntawm cov pob zeb txau, txhim kho kev tsim kho kom zoo thiab zoo. Yog li ntawd, kua ceev-teeb neeg ua hauj lwm yog nyob rau hauv siab thov rau ntub txau daim ntaub ntawv.

Kev siv cov kua qis-alkali ceev-teeb cov neeg ua haujlwm tseem nyob hauv nws cov menyuam mos hauv Suav teb. Txawm li cas los xij, daim ntawv thov ntawm cov khoom lag luam thoob ntiaj teb xws li Sika hauv cov dej num loj hydraulic engineering tau txhawb txoj kev loj hlob ntawm cov neeg ua haujlwm ceev ceev hauv Suav teb rau qee qhov.
Feem ntau siv cov kua ua kua ceev ceev xws li sodium silicate type, sodium aluminate type, aluminium sulfate type, thiab potassium aluminium sulfate type. Sodium silicate hom kua ceev-setting tus neeg saib xyuas yog tsim los ntawm cov iav dej (Na2SiO3), potassium dichromate, sodium nitrite, thiab triethanolamine. Sodium aluminate muaj alkalinity siab thiab yog siv los ua tus neeg sawv cev ceev ceev alkaline. Cov kua qaub qis-alkali ceev-teeb cov neeg ua haujlwm tuaj yeem muab faib ua pawg hauv qab no:
Ua kua txhuas sulfate hom ceev-setting tus neeg saib xyuas yog ib yam tsawg-alkali uas yog tsim los ntawm anhydrous aluminium sulfate thiab lwm yam khoom. Hom kev teeb tsa ceev ceev no muaj ntau yam, thiab muaj qhov sib txawv tseem ceeb hauv cov khoom siv thiab kev npaj tshuab. Tsawg-alkali kua ceev-teeb neeg ua hauj lwm raws li txhuas sulfate thiab sodium aluminate muaj me ntsis cuam tshuam rau tom qab lub zog ntawm cov cement thiab muaj kev hloov tau zoo rau ntau hom cement. Txawm li cas los xij, qis-alkali kua sai-teeb cov neeg ua hauj lwm raws li txhuas sulfate thiab txhuas hydroxide yooj yim cov kauj ruam cov tshuaj tiv thaiv los ntawm ncaj qha generating polymeric aluminium sulfate yam tsis muaj theem nrab ntawm generating aluminium hydroxide. Txawm li cas los xij, hom kua ua kua ceev ceev no muaj kev ruaj ntseg tsis zoo, nag lossis daus yooj yim, thiab crystallization, uas tsis tsim nyog rau kev cia thiab siv mus ntev. Tsis tas li ntawd, aluminium sulfate kuj tuaj yeem sib xyaw nrog cov tshuaj fluoride thiab magnesium sulfate los npaj cov kua qaub-alkali sai-setting agents.

Organic-inorganic composite ceev-teeb neeg ua hauj lwm yuav daws tau ntau yam teeb meem ntawm inorganic ceev-teeb neeg ua hauj lwm, xws li txo cov rebound tus nqi ntawm cov pob zeb thaum lub sij hawm tsim kho los ntawm nce cohesion ntawm cement slurry.
Cov txheej txheem ntawm cov kua qis-alkali ceev-teeb cov neeg ua haujlwm tuaj yeem muab faib ua ob lub ntsiab lus: (1) los ntawm kev txhawb nqa kev tsim cov calcium aluminate ntau kom ua tiav lub hom phiaj ntawm kev teeb tsa sai; (2) los ntawm kev txhawb nqa sai hydration ntawm tricalcium aluminate nyob rau hauv cov cement los ua ib tug nruj interconnected calcium aluminate qauv, yog li txhawb kom ceev ceev hardening ntawm cement.