Dab tsi yog Qhov Kev Ceeb Toom Ntawm Cov Pob Zeb Accelerator?

pob zeb accelerator

Cov no yog cov additives tov rau hauv pob zeb ua kom nws teem thiab harden sai. Cov hom tseem ceeb muaj xws li inorganic ntsev thiab cov organic tebchaw. Cov accelerators no yog cov hmoov av, thiab lawv qhov ntau npaum li cas tsuas yog 2% mus rau 3% ntawm cov cement siv rau hauv cov pob zeb, tab sis lawv tuaj yeem ua rau cov pob zeb tsim pib hauv 5 feeb, thiab ua tiav hauv 12 feeb. Qhov no ua rau lawv zoo tagnrho rau kev kho sai sai lossis rau kev teeb tsa pob zeb sai sai hauv qhov av. Lawv yog ib qho tseem ceeb nyob rau hauv txoj kev siv tshuaj tuacrete, qhov twg lawv lub luag haujlwm yog txhawm rau txhawm rau txhawm rau hydration thiab hardening ntawm cov cement, tsim kom muaj zog txaus hauv lub sijhawm luv luv kom tau raws li qhov xav tau ntawm kev tsim kho tshwj xeeb.

kawm ntxiv

Kev ceev faj rau kev siv cov pob zeb accelerators

Tsis txhob ntxiv cov accelerators thaum sib tov khoom: Txij li cov khoom sib xyaw xws li pob zeb thiab cov xuab zeb muaj cov dej noo ntau, cov accelerators tuaj yeem nqus dej thiab decompose ua ntej cov pob zeb yog txau, cuam tshuam rau lub sijhawm teeb tsa thiab txo lub zog ntawm cov pob zeb. Qhov no tuaj yeem ua rau cov txiaj ntsig tsis zoo hauv kev txhaj tshuaj.

Ua ib qho kev xeem sib tw: Ua ntej siv, nws yog ib qho tsim nyog yuav tsum tau ua qhov kev ntsuam xyuas zoo tshaj plaws nrog cov cement siv hauv kev tsim kho.

Ntxiv cov kua accelerators ntawm lub tshuab tshuaj tsuag qhov hluav taws xob: Ua ntej siv, kua accelerators yuav tsum tau muab ntxiv rau ntawm lub tshuab tshuaj tsuag qhov hluav taws xob. Cov dej siv hauv cov pob zeb sib xyaw yuav tsum tau kho kom suav nrog cov dej qhia los ntawm cov accelerators.

Tswj qhov ntau npaum ntawm accelerators: Qhov ntau npaum li cas ntawm cov accelerators yuav tsum tau tswj los ntawm kev siv lub ntsuas dej ntws los yog lub ntsuas dej precision.

Tsis txhob siv cov cement uas tas sij hawm los yog qis dua: Siv cov cement lossis cement uas tsis ua raws li lub teb chaws yuav tsum tsis txhob siv. Accelerators yuav tsum tau muab khaws cia kom zoo los tiv thaiv kev nqus noo noo, uas tuaj yeem ua rau lawv tawg thiab tsis ua haujlwm.

Hom Pob Tawb Accelerators

Alumina Clinker Accelerators: Cov accelerators siv alumina clinker ua cov khoom tseem ceeb thiab tuaj yeem muab faib ua alumina clinker, carbonate systems, thiab composite sulfoaluminate systems. Cov khoom tseem ceeb ntawm alumina clinker thiab carbonate systems accelerators yog sodium aluminate, sodium carbonate los yog potassium carbonate, thiab quicklime. Lub ntsiab drawback ntawm cov accelerators yog lawv cov ntsiab lus alkali siab, uas cuam tshuam rau lub zog mus sij hawm ntev ntawm cov pob zeb.

Dej iav Accelerators: Lub ntsiab tseem ceeb ntawm cov accelerators yog dej iav (sodium silicate). Vim lub viscosity siab ntawm cov iav dej ntshiab, nws tsis tuaj yeem txau ib leeg thiab yuav tsum tau ntxiv cov ntsev inorganic (xws li potassium dichromate rau viscosity txo, los yog triethanolamine rau lub zog thaum ntxov) kom txo viscosity, txhim kho fluidity, thiab ua kom muaj zog thaum ntxov. Qhov ntau npaum li cas yog feem ntau 8% mus rau 15% ntawm cov cement hnyav.

Aluminate Liquid Accelerators: These are widely used in concrete engineering and can be used alone or in combination with hydroxides or carbonates. There are two types: sodium aluminate and potassium aluminate. These accelerators are characterized by low dosage and rapid early strength growth, but they can significantly reduce the final strength, sometimes by as much as 30% to 50%. Additionally, they have a high pH (>13), ua rau lawv corrosive heev.

Tshiab Inorganic Low-Alkali Accelerators: Cov hmoov-raws li accelerators yog tsawg nyob rau hauv alkali los yog alkali-dawb thiab tsis cuam tshuam rau cov pob zeb muaj zog. Lawv yooj yim rau qhov chaw, muaj cov txheej txheem tsim khoom yooj yim, thiab tsim nyog rau kev sib xyaw ua ke ntawm cov tshuaj tua kab mob qhuav, kho me me, thiab cov xwm txheej uas muaj kev thauj mus los ntev lossis ncua tsis tu ncua.

Tshiab Ua Kua Alkali-dawb Accelerators: Cov accelerators no tau categorized rau hauv cov organic thiab inorganic kua hom. Inorganic nruab nrab ntsev kua alkali-dawb accelerators, uas yog tus nqi nruab nrab thiab ua tau zoo, tab tom tau txais kev pom zoo thiab tab tom pib nce qib hauv tsev thiab txawv teb chaws. Cov accelerators no feem ntau muaj cov khoom siv txhuas thiab sawv cev rau yav tom ntej sib txawv ntawm alkali-dawb, kua accelerators. Raws li lawv cov khoom tseem ceeb, lawv tuaj yeem muab faib ua ob hom: hydroxy aluminium series thiab aluminium sulfate series.