Qhov twg yog polycarboxylic superplasticizer zoo?

Dab tsi yog qhov zoo ntawm polycarboxylate superplasticizers? Nrog rau txoj kev loj hlob sai ntawm kev lag luam thoob ntiaj teb, kev tsim kho kev lag luam tau nce siab rau kev ua vaj tse. Vim nws qhov txiaj ntsig tsis tuaj yeem hloov pauv hauv cov pob zeb ua haujlwm siab thiab nws cov yam ntxwv zoo ib puag ncig, polycarboxylate superplasticizers (PCEs) tau txais kev lees paub thoob plaws hauv tebchaws thiab thoob ntiaj teb. Ordinary pob zeb tsis ua raws li qee qhov kev xav tau, xav tau kev txhim kho zoo dua. Txij li thaum kev siv cov khoom sib xyaw ua ke nyob rau hauv lub xyoo pua 20th, lawv tau txais txiaj ntsig zoo heev tsis yog kev tsim kho kev lag luam nkaus xwb tab sis kuj tseem muaj lwm cov haujlwm. Nyob rau hauv xyoo tas los no, tshwj xeeb tshaj yog tom qab nkag mus rau hauv lub xyoo pua 21st, tau muaj kev mloog zoo thiab kev loj hlob sai hauv daim teb no. Tus naj npawb ntawm cov tuam txhab tsim khoom lag luam tau loj hlob los ntawm ob peb mus rau kaum ob hauv tsuas yog plaub mus rau tsib xyoos. Cov khoom siv tseem ceeb, suav nrog cov dej reducers, shrinkage reducers, thiab air-entraining agents, tau ua rau muaj txiaj ntsig zoo rau kev txhim kho kev ua tau zoo. Kab lus no feem ntau qhia txog qhov cuam tshuam ntawm cov dej-txo cov neeg ua haujlwm ntawm cov pob zeb.

Kev ua tau zoo ntawm Polycarboxylate Superplasticizers

Polycarboxylate superplasticizers muaj cov chloride ion tsawg thiab cov ntsiab lus alkali, nrog rau qhov nro ntawm tsuas yog 37.8 mN / m. Qhov no ua rau txo qhov nro ntawm cov tshuaj capillary hauv cov pob zeb, txo kom qhuav shrinkage thiab zoo heev txhim kho lub durability ntawm cov pob zeb. Kev tshawb fawb dav dav tau pom tias ntawm qhov ntau npaum li cas ntawm 0.15% ntawm cov cement hnyav, tus nqi txo cov dej ntau dua 20% yog ua tiav, tshaj qhov kev ua tau zoo ntawm cov naphthalene-based high-efficiency. dej reducers muaj nyob rau hauv khw. Ntawm qhov ntau npaum li cas ntau dua 0.30% ntawm cov cement hnyav, tus nqi txo cov dej tuaj yeem ncav cuag 30%. Txawm hais tias nce qhov ntau npaum li cas txo cov dej haus thiab ua kom cov dej txo qis, qhov kev txhim kho tsis zoo heev; Txawm li cas los xij, qhov kev tuav pov hwm poob qis yuav ruaj khov dua. Kev poob qis lossis ntws ntawm cov pob zeb tshiab nce ntxiv tom qab 1 teev, txawm tias ntau npaum li cas yuav ua rau qee qhov los ntshav. Qhov tseem ceeb, txawm tias ntawm qhov ntau npaum li 0.15% ntawm cov cement hnyav, ob qho tib si poob thiab flowability tseem tsis hloov.

Kev cuam tshuam ntawm Polycarboxylate Superplasticizers ntawm pob zeb muaj zog

Polycarboxylate superplasticizers nthuav tawm cov teebmeem zoo. Tom qab ntxiv PCE, lub zog compressive ntawm pob zeb nce ntxiv, tshwj xeeb tshaj yog thaum ntxov zog. Ntawm qhov ntau npaum li cas ntawm 0.15% ntawm cov cement hnyav, lub zog compressive ntawm 3 hnub tuaj yeem nce mus txog 190%. Nyob rau hauv lwm yam kev mob, lub zog nce kuj tshaj 200%. Qhov nce hauv compressive zog ntawm cov hnub nyoog sib txawv kuj tau hais. Cov txiaj ntsig kev sim qhia tias muaj zog nce ntawm 80%-150% ntawm 3 hnub, 50%-150% ntawm 7 hnub, thiab 50%-100% ntawm 28 hnub, nrog kev txhim kho lub zog ntau dua 50% ua 90d. Yog li, pob zeb nrog ntxiv polycarboxylate tsis tsuas yog ua kom pom lub zog thaum ntxov tab sis kuj qhia tau tias muaj zog ntxiv tom qab uas tseem muaj zog.

Hauv qee qhov ntau, raws li qhov ntau npaum li cas ntawm polycarboxylate nce, nws cov txiaj ntsig kev txhim kho tau nthuav tawm ntau dua. Los ntawm ob qho tib si alkali-dej txhim kho thiab kev pom kev lag luam, qhov kev pom zoo yog 0.20%-0.30%.

Adaptability rau ntau hom Cement

Kev ntsuam xyuas ntawm ntau hom cement qhia tias cov dej txo qis tshaj 25%, mus txog ze li 30%. Cov pob zeb tawg tseem nyob ruaj khov tom qab 1 teev, nrog qee cov cements txawm tias pom qhov nce hauv qhov poob qis. Tsis tas li ntawd, cov ntshav los ntshav tau txo qis dua piv rau cov pob zeb hauv paus. Txawm hais tias kev soj ntsuam kev poob qis lossis kev ua haujlwm ntawm alkali-dej thiab cov ntshav los ntshav, cov txiaj ntsig tau qhia tias polycarboxylate zoo sib xws nrog ntau yam cements.

Txoj kev loj hlob ntawm lub zog kuj tseem qhia tau meej tias cov pob zeb ntxiv nrog polycarboxylate nthuav tawm sai sai thaum ntxov lub zog loj hlob thiab kev loj hlob ruaj khov tom qab lub zog. Qhov kev hloov pauv no siv tau rau ob qho tib si tshiab sib xyaw ua vaj tse thiab cov pob zeb tawv tawv cov khoom siv kho tshuab.

Adaptability rau Mineral Admixtures

Mineral admixtures tau dhau los ua cov ntaub ntawv tseem ceeb hauv kev lag luam pob zeb los hloov cov cement thiab txhim kho kev ua vaj tse. Yog li, kev tshawb fawb txog kev sib raug zoo ntawm polycarboxylate nrog cov ntxhia sib xyaw yog qhov tseem ceeb. Kev sim ua kom pom tau tias thaum noj cov tshauv yoov tshaj cum nce ntxiv, kev ua haujlwm ntawm cov pob zeb ua kom zoo dua qub, thiab cov dej txo qis nce ntxiv. Piv nrog rau cov tshuaj naphthalene-based superplasticizers, cov dej siv hauv cov pob zeb txo qis los ntawm 8 kg, thiab cov ntshav los txo qis. Qhov tseem ceeb tshaj, lub sij hawm teeb tsa ntawm cov pob zeb sib xyaw nrog PCE yog luv dua li nrog naphthalene-based superplasticizers, zam dhau qhov kev cia siab rau yav dhau los rau retarders rau slump tuav. Txawm li cas los xij, raws li tus nqi ntawm cov hmoov ntxhia nce ntxiv, kev txhim kho hauv cov dej-txo cov nqi txo qis, ua rau me ntsis txo qis qis, txawm tias los ntshav feem ntau tsis tuaj. Thaum siv ob qho tib si ya tshauv thiab ntxhia hmoov, cov slump tuav txhim kho ntxiv. Zuag qhia tag nrho, polycarboxylate yog tshwj xeeb tshaj yog haum rau cov pob zeb uas muaj ntau npaum li cas ntawm cov ntxhia pob zeb, tsis tsuas yog txo cov dej haus tab sis kuj tseem txhim kho kev sib xyaw ua haujlwm zoo. Thaum lub zog thaum ntxov ntawm cov pob zeb nrog ntxiv ya tshauv lossis hmoov ntxhia tuaj yeem txo qis me ntsis, cov txiaj ntsig tau tshaj tawm nrog cov hmoov ntxhia. Lub zog tom qab qhia tau hais tias nce me ntsis thaum siv cov tshauv ya, thaum cov tshuaj naphthalene-raws li kev sib xyaw ua ke pom muaj zog tsawg heev ntawm 1 hnub thiab qeeb tom qab lub zog loj hlob. Los ntawm kev pom kev ua haujlwm zoo, polycarboxylate qhia tau tias muaj kev sib raug zoo nrog cov ntxhia ntxhia, ua rau nws haum rau lub zog siab, kev ua haujlwm siab.

Adaptability rau qhov kub thiab txias

Cov tsoos ua haujlwm siab ua haujlwm dej reducers yog rhiab rau qhov kub thiab txias. Thaum lub caij ntuj sov kub, dispersibility txhim kho, tab sis fluidity poob intensifies. Nyob rau lub caij ntuj no, qhov kub tsis tshua muaj ua rau txo qis dispersibility, ua rau kom muaj dej ntau ntxiv hauv cov pob zeb tshiab. Kev sim ntawm qhov ntsuas kub hloov pauv ntawm polycarboxylate qhia tau tias thaum kub siab tshaj 20 degrees Celsius, qhov poob ntawm kev ua haujlwm nce me ntsis, tab sis dispersibility txhim kho. Ntawm qhov kub thiab txias, dispersibility me ntsis txo; Txawm li cas los xij, kev tuav pov hwm kev ua haujlwm tseem nyob ruaj khov. Cov pob zeb tshiab khaws cia ob qho tib si poob qis thiab sib kis, nrog kev nce ntxiv hauv cov dej ntws thaum kub poob qis dua 0 degrees Celsius. Raws li qhov kub thiab txias, cov dej-txo kev ua tau zoo ntawm pob zeb nrog polycarboxylate txhim kho. Tshaj li 20 degrees Celsius, qhov kev ua tau zoo nyob ruaj khov, txawm hais tias kev tuav pov hwm muaj peev xwm txo qis me ntsis, thiab kev sib kis tsis tuaj yeem nce ntxiv, qee zaus qhia kev txo qis. Zuag qhia tag nrho, txawm tias nyob rau lub caij ntuj no qhov kub tsis txias los yog lub caij ntuj sov kub, polycarboxylate ua tau zoo, zoo tswj cov pob zeb tawg tsis tas yuav tsum tau retarders, uas yog qhov zoo heev rau kev tsim vaj tsev.