Yuav ua li cas yog daim ntawv thov ntawm qhob expansion tus neeg sawv cev?

Concrete expansion agents yog indispensable additives nyob rau hauv niaj hnub pob zeb engineering. Lawv muab cov pob zeb nrog cov khoom ntim nthuav dav, zoo inhibiting lossis compensating rau contraction thaum lub sij hawm hardening txheej txheem. Qhov no txo ​​lossis txawm tias tshem tawm qhov tsim ntawm cov kab nrib pleb, yog li txhim kho cov kav ntev thiab kev ncaj ncees ntawm cov pob zeb ua vaj tse. Kab lus no qhia meej txog hom, cov txheej txheem, cov txheej txheem siv, kev ceev faj, thiab kev siv tshwj xeeb ntawm cov pob zeb nthuav dav hauv kev ua haujlwm engineering.

Hom Kev Txhaum Txhaum Cai

Concrete expansion agents tuaj yeem faib dav rau hauv cov pawg hauv qab no raws li lawv cov tshuaj muaj pes tsawg leeg thiab cov txheej txheem ntawm kev ua:

Calcium Sulfoaluminate Expansion Agent:

Sawv cev los ntawm alumite expansion agent, CSA expansion agent, thiab U-type expansion agent.

Cov khoom tseem ceeb muaj xws li anhydrous gypsum, gypsum dihydrate, thiab alumite.

Tsim cov calcium alumina crystals thaum lub sij hawm hydration, compensating rau pob zeb shrinkage los ntawm ntim expansion.

Calcium Oxide Expansion Agent:

Feem ntau ntawm cov txiv qaub los yog slaked txiv qaub tov nrog gypsum thiab lwm yam additives.

Nyob rau hauv ib qho chaw ntub dej, calcium oxide reacts nrog dej los tsim calcium hydroxide, ua rau lub ntim loj nthuav, uas muaj txiaj ntsig zoo rau cov pob zeb qhuav thiab cov yas shrinkage.

Composite Expansion Agent:

Ua ke qhov zoo ntawm cov khoom siv tsis zoo thiab cov organic, xws li kev sib xyaw ntawm cov ntxhia thiab cov organic expansion agents.

Muab cov khoom sib npaug ntawm kev nthuav dav los ntawm ob qho tib si tshuaj tiv thaiv thiab kev ua lub cev.

Hlau Expanders:

Piv txwv xws li hlau filings expanders, uas tsim ntim expansion los ntawm cov tshuaj tiv thaiv ntawm hlau hmoov nrog ib tug oxidizing tus neeg sawv cev.

Txawm tias tsis tshua muaj, lawv tau siv rau hauv cov xwm txheej tshwj xeeb.

Mechanism ntawm Action

Cov txheej txheem ntawm cov pob zeb nthuav dav feem ntau suav nrog cov tshuaj lom neeg lossis cov txheej txheem ntawm lub cev uas tsim kom muaj kev tswj hwm kev nthuav dav hauv cov pob zeb. Qhov no siab offsets los yog alleviates volumetric shrinkage vim dej evaporation, kub sib txawv, tshuaj shrinkage, thiab lwm yam. Piv txwv li, calcium sulfoaluminate expansion agents tsim calcium alumina crystals thaum lub sij hawm cement hydration. Kev loj hlob ntawm cov muaju no ua rau lub ntim nthuav dav uas them nyiaj rau cov pob zeb uas nws tus kheej-shrinkage thiab ziab shrinkage.

Kev siv

Mix Design:

Hom thiab ntau npaum li cas ntawm tus neeg sawv cev nthuav dav, nrog rau nws cov kev sib raug zoo nrog lwm cov ntaub ntawv, yuav tsum tau txiav txim siab hauv kev sib xyaw ua ke tsim kom ntseeg tau tias qhov kev ua tau zoo.

Mixing thiab Pouring:

Tus neeg sawv cev nthuav dav yuav tsum sib npaug sib npaug hauv qhov sib xyaw ua ke rau kev nthuav dav.

Thaum lub sij hawm nchuav, kev co ntau dhau yuav tsum tau zam kom tsis txhob cuam tshuam qhov kev nthuav dav ntawm tus neeg sawv cev.

Kho:

Tsim nyog cov av noo thiab qhov kub thiab txias yog qhov tseem ceeb rau tus neeg sawv cev nthuav dav.

Kev ntsuas kev kho kom zoo txhawb nqa tag nrho hydration ntawm tus neeg sawv cev nthuav dav thiab ua kom nws cov txiaj ntsig shrinkage kom zoo.

Cov kev ceev faj

Admixture Control:

Qhov ntau npaum li cas ntawm tus neeg sawv cev nthuav dav yuav tsum raug xam kom raug raws li cov kev xav tau tshwj xeeb thiab hom kev nthuav dav tus neeg sawv cev. Ob qho tib si overuse thiab underuse tuaj yeem cuam tshuam rau kev ua tau zoo.

Environmental Factors:

Kev tsim kho ib puag ncig kub thiab av noo cuam tshuam rau tus neeg sawv cev nthuav dav.

Kev ntsuas tshwj xeeb tej zaum yuav xav tau nyob rau hauv qhov kub thiab txias los yog qhuav ib puag ncig kom ntseeg tau tias cov pob zeb nthuav dav.

Compatibility nrog lwm cov khoom xyaw:

Thaum siv nrog rau lwm cov khoom sib xyaw, xws li cov dej txo qis thiab cov tshuaj tiv thaiv thaum ntxov, kev sib cuam tshuam ntawm lawv yuav tsum tau txiav txim siab.

Kev sib xyaw ua ke zoo yuav tsum tau txiav txim siab los ntawm kev sim.

Engineering Application Piv txwv

Cov khoom siv pob zeb nthuav dav siv dav hauv cov haujlwm tseem ceeb xws li txuas hniav, tunnels, dams, thiab cov tsev siab. Hauv kev tsim vaj tsev loj, cov neeg ua haujlwm nthuav dav pab tswj qhov kub thiab txias los ntawm kev them nyiaj rau qhov shrinkage vim thermal stresses. Hauv cov phiaj xwm hauv av, lawv tiv thaiv kev tawg los ntawm av av yaig, txhim kho cov qauv kev ua haujlwm tsis zoo.

Hauv cov ntsiab lus, cov pob zeb nthuav dav yog qhov tseem ceeb rau kev txhim kho pob zeb ua haujlwm. Lawv cov kev xaiv kom raug thiab daim ntawv thov tseem ceeb txhim kho qhov project zoo thiab txuas ntxiv lub neej ntawm cov qauv. Raws li cov ntaub ntawv tshawb fawb tau nce zuj zus thiab kev coj ua engineering tob zuj zus, kev tshawb fawb, kev tsim kho, thiab kev siv cov neeg ua haujlwm nthuav dav tshiab yuav dhau los ua ntau dua, muab kev txhawb nqa zoo rau kev tsim kho kom ruaj ntseg thiab ruaj khov.

Hais txog Borida

Borida yog ib lub tuam txhab ua lag luam hauv kev txhim kho thiab tsim cov khoom siv ua kom muaj txiaj ntsig zoo. Nrog rau kev tsom mus rau kev tsim kho tshiab thiab kev ua tau zoo, Borida muab cov kev daws teeb meem uas txhim kho kev ua tau zoo, ua kom muaj zog thiab kev ntseeg siab hauv ntau yam kev tsim kho. Peb txoj kev mob siab rau kev ua tau zoo thiab kev txaus siab rau cov neeg siv khoom ua rau Borida yog ib tus neeg ntseeg siab hauv kev tsim kho kev lag luam.