Dab tsi yog qhov ua tau zoo ntawm polycarboxylic superplasticizer?

Polycarboxylic superplasticizer yog lub cim thib peb ntawm cov dej ua haujlwm siab, tsim tom qab cov dej txo qis uas sawv cev los ntawm cov ntoo calcium thiab cov dej ua haujlwm siab uas sawv cev los ntawm naphthalene series. Nws yog ib qho ntawm cov qib siab tshaj plaws, siab tshaj plaws hauv cov ntsiab lus thev naus laus zis, kev cog lus zoo tshaj plaws, thiab kev ua haujlwm zoo tshaj plaws hauv lub ntiaj teb.

Polycarboxylic superplasticizer yog ib puag ncig tus phooj ywg ua haujlwm siab dej reducer ntawm nws tus kheej tsim los ntawm peb lub tuam txhab. Cov kua yog lub teeb daj lossis xim av-liab pob tshab kua. Cov khoom tseem ceeb yog polycarboxylic polymer series cov khoom uas muaj qhov hnyav molecular li ntawm 5000 txog 50000. Kev sib piv nrog cov khoom zoo sib xws hauv tsev thiab thoob ntiaj teb qhia tias polycarboxylic superplasticizer tau mus txog qib siab thoob ntiaj teb raws li kev ntsuas kev ua tau zoo thiab kev ua haujlwm zoo. Nws suav nrog kev txo qis dej, txo qis qis, txhim kho lub zog, txo qis, thiab kev tiv thaiv ib puag ncig, ua rau nws ua tau zoo ntawm cov dej reducers. Nws tag nrho daws cov teeb meem ntawm siab viscosity thiab kev ua haujlwm tsis zoo nyob rau hauv high-strength thiab high-performance pob zeb, ua rau nws yog ib qho zoo tagnrho additive rau kev npaj high-strength thiab high-kev ua tau zoo pob zeb. Nws tuaj yeem sib xyaw nrog ntau yam khoom siv los tsim cov khoom siv ntau yam ntxiv, xws li cov twj tso kua mis, cov neeg ua haujlwm thaum ntxov, cov tshuaj tiv thaiv permeability thiab cov dej tsis zoo, thiab cov retarders.

Cov khoom lag luam feem ntau ua raws li cov qauv ntawm GB8076-1997 "Concrete Admixtures," Ministry of Railways 'Science thiab Technology Basis [2005]101 "Tsev Kawm Ntawv Ib ntus rau Kev Ua Haujlwm Zoo Tshaj Plaws rau cov neeg caij tsheb Dedicated Lines," thiab Kev Tshawb Fawb thiab Technology [2006] 104 "Cov Khoom Siv Tshuaj Ntsuam Xyuas Cov Lus Qhia rau Kev Ua Haujlwm Zoo Tshaj Plaws rau Cov Neeg Caij Tsheb Dedicated Kab, nrog rau JG/T223-2007 "Polycarboxylic Superplasticizer" tus qauv. Txhua qhov ntsuas kev ua tau zoo ua tau raws li qhov yuav tsum tau ua ntawm cov qauv no.

1. Tsawg npaum li cas, dej txo tus nqi siab: Thaum noj ntau npaum li 1.0%, cov dej txo qis tshaj 35%.

2. Thaum ntxov muaj zog thiab siab zog: Lub zog thaum ntxov nce ntau dua 50%, thiab lub zog 28-hnub nce ntau dua 30%. Nws yog tshwj xeeb tshaj yog haum rau cov pob zeb nrog siab ya tshauv cov ntsiab lus. Lub zog nce ntxiv nrog kev nce ntxiv hauv qhov ntau npaum li cas, tab sis tom qab ntau tshaj qhov kev pom zoo, lub zog tsis nce ntxiv.

3. Tsawg poob qis: Lub sijhawm 1-teev khaws cia tau zoo heev. Ntawm qhov kub thiab txias, nws tseem tsis hloov pauv, thiab qhov poob qis txawm nce me ntsis. Thaum qhov kub siab tshaj 20 degree, qhov 1-teev poob qis yog tsawg, tab sis tseem tswj tau tshaj 95%. Thaum qhov kub thiab txias tshaj 30 degree, lub 1- teev slump retention tseem nyob ntawm 93%.

4. Kev ua haujlwm zoo ntawm pob zeb: Qhob npaj nrog polycarboxylic superplasticizer, txawm nyob rau hauv siab slump, yuav tsis pom pom tseeb segregation los ntshav, thiab cov pob zeb zoo nkaus li zoo ib yam nyob rau hauv cov xim. Qhov no tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau kev npaj cov pob zeb ua haujlwm siab, ua kom nws tus kheej-leveling pob zeb, nws tus kheej-compacting pob zeb, thiab cov pob zeb ncaj ncees. Thaum npaj cov pob zeb muaj zog, kev ua haujlwm tau zoo, cohesiveness, thiab yooj yim ntawm kev sib xyaw yog zoo heev.

5. Zoo heev durability ntawm pob zeb: Pob zeb nrog cov khoom no nthuav tawm zoo sau, ruaj khov, twj tso kua mis, lub zog, ntom ntom, tiv thaiv sulfate corrosion, alkali-tag nrho cov tshuaj tiv thaiv, Frost tsis kam, shrinkage, thiab creep piv rau cov dej zoo tib yam.

6. Zoo sib xws nrog ntau hom cement thiab additives: Nws daws teeb meem kev sib raug zoo uas yuav tshwm sim thaum siv lwm hom dej reducers nrog cov ntaub ntawv cementitious.

7. Zoo stability: Tsis muaj nag lossis daus ntawm qhov kub thiab txias.

8. Ib puag ncig tus phooj ywg khoom: Cov khoom no muaj cov ntsiab lus alkali qis heev, cov ntsiab lus chloride ion, sodium sulfate cov ntsiab lus, thiab cov ntsiab lus formaldehyde, thiab tsis tsim muaj kuab paug thaum tsim khoom, ua raws li ISO 14000 ib puag ncig kev tiv thaiv cov qauv kev tswj hwm. Nws txhawb kev txhim kho kom ruaj khov.

9. Cov txiaj ntsig zoo ntawm kev lag luam: Tus nqi tsim nyog engineering yog qis dua thaum siv lwm hom khoom.

Cov lus qhia siv:

Qhov ntau npaum ntawm polycarboxylic superplasticizer yog {{0}}.4% mus rau 2.5% ntawm tag nrho qhov hnyav ntawm cov ntaub ntawv cementitious, nrog rau kev siv ntau npaum li ntawm 0.8% mus rau 1.5%. Kev sib xyaw ua ntej yuav tsum tau ua los txiav txim siab qhov zoo tshaj plaws.

Polycarboxylic superplasticizer yuav tsum tsis txhob tov nrog naphthalene-based high-efficiency dej reducers. Thaum siv polycarboxylic superplasticizer, mixers thiab tsheb thauj khoom uas tau siv nrog naphthalene-raws li dej reducers yuav tsum tau ntxuav kom huv si, vim tsis ua li ntawd yuav ua rau cov dej-txo cov nyhuv.

Polycarboxylic superplasticizer tuaj yeem ncaj qha ntxiv rau hauv cov kua lossis npaj rau hauv cov kev daws teeb meem ntawm qee qhov concentration, nrog cov dej ntsiab lus ntawm polycarboxylic superplasticizer nws tus kheej txiav tawm.

Vim tias cov dej txo qis ntawm cov pob zeb nrog polycarboxylic superplasticizer, cov slump yog cov rhiab heev rau cov ntsiab lus dej, yog li kev tswj hwm cov dej-cement piv yog tsim nyog thaum siv.

Polycarboxylic superplasticizer yog sib xws nrog feem ntau ntawm cov cements. Txawm li cas los xij, rau qee yam ntawm cov cement, cov dej txo qis thiab qhov poob loj dua tuaj yeem tshwm sim. Lub sijhawm ua kom zoo thiab khaws cia ntawm cov cement kuj tuaj yeem cuam tshuam kev ua haujlwm ntawm polycarboxylic superplasticizer. Nyob rau hauv cov ntaub ntawv no, nws raug pom zoo kom nce qhov ntau npaum los yog compound nrog rau lwm yam retarding Cheebtsam.

Cov ntsiab lus cua ntawm cov pob zeb nrog polycarboxylic superplasticizer yuav nce (feem ntau 2% -5%), uas pab txhim kho kev ua haujlwm thiab ua haujlwm ntev ntawm cov pob zeb. Rau cov ntawv thov xws li chav tsev kho mob lossis lwm yam tshwj xeeb, thov hu rau peb kom tau txais kev pab ntxiv.

Vim tias qhov me me thiab cov dej txo qis, siv polycarboxylic superplasticizer los npaj cov pob zeb ntawm cov qib C45 thiab siab dua tuaj yeem txo cov nqi tsim nyog, muab cov txiaj ntsig zoo thiab kev lag luam. Rau cov pob zeb hauv qab C45, txawm hais tias tus nqi ntawm polycarboxylic superplasticizer yog siab dua, tag nrho cov nqi ntawm cov pob zeb yuav raug txo los ntawm kev siv cov ntxhia ntxiv, uas ua rau muaj txiaj ntsig zoo thiab kev lag luam.