Kev siv PCE hmoov rau hauv cov khoom siv precast concrete

Polycarboxylate dej txo(PCE)yog ib hom tshiab ntawm cov khoom siv txo dej uas zoo rau ib puag ncig, uas tau siv dav hauv ntau yam khoom siv ua vaj tse, tshwj xeeb tshaj yog hauv kev tsim cov khoom siv ua vaj tse precast. Nrog rau kev nce qib ntawm kev lag luam hauv tsev, cov khoom siv precast tau tsim kho sai hauv cov teb ntawm vaj tse, kev thauj mus los, kev tswj hwm hauv nroog, thiab lwm yam, thiab PCE hmoov tau dhau los ua ib qho ntawm cov khoom sib xyaw tseem ceeb los txhim kho qhov zoo thiab kev tsim kho ntawm cov khoom siv precast vim nws qhov kev ua tau zoo heev thiab kev hloov pauv tau.

1. Kev Taw Qhia Txog PCE Hmoov

PCE hmoov yog ib hom khoom khov kho ntawm polycarboxylate dej reducer nrog kev sib xyaw zoo heev, kev khaws cia thiab kev sib haum xeeb. Piv nrog rau kua PCE, PCE hmoov yooj yim thauj thiab khaws cia, tsim nyog rau kev siv hauv cov mortar qhuav-sib xyaw, cov ntaub ntawv tsim kho hmoov qhuav thiab cov xwm txheej tsis muaj dej, tshwj xeeb tshaj yog haum rau cov kev xav tau ntawm lub Hoobkas thiab kev tsim khoom loj ntawm precast concrete.

2. Cov yam ntxwv thiab cov teeb meem ntawm cov pob zeb ua ntej

Cov khoom siv ua vaj tse precast muaj xws li cov ntoo precast, cov phab ntsa precast, cov ntaiv precast, cov chaw pw, cov yeeb nkab, thiab lwm yam. Cov khoom no muaj cov yam ntxwv hauv qab no:

Cov kev xav tau lub zog siab: Cov pob zeb ua vaj tse yuav tsum muaj lub zog thaum ntxov thiab lub zog kawg kom ua kom sai dua kev rhuav tshem thiab kev thauj mus los.

Kev npliag zoo: Tshwj xeeb tshaj yog rau cov pob zeb uas sib zog ua ke (SCC) siv rau kev pwm pwm, kev npliag zoo yuav tsum tau tswj kom ntseeg tau tias qhov ceev thiab qhov zoo li cas.

Lub voj voog tsim kho sai: Cov pob zeb yuav tsum tau tsim kom muaj zog sai, uas yog qhov zoo rau kev txhim kho kev tsim khoom.

Qhov tseeb ntawm qhov ntev: Qhov xav tau rau qhov poob me me ntawm cov pob zeb ua vaj tse yog qhov tseem ceeb dua.

Yog li ntawd, cov kev xav tau siab dua tau muab tso rau pem hauv ntej rau cov tshuab txo dej, uas yog, qhov txo dej siab, kev khaws cia zoo thiab lub sijhawm teeb tsa tswj tau.

3. Cov txiaj ntsig ntawm PCE hmoov hauv cov pob zeb ua ntej

3.1. Kev ua haujlwm txo dej zoo heev

PCE hmoov muaj kev ua tau zoo heev rau kev sib kis. Nws tuaj yeem qhwv thiab faib cov cement me me los ntawm cov saw hlau tseem ceeb thiab cov saw hlau sab hauv cov qauv molecular, thiab tuaj yeem ua tiav qhov txo dej ntau dua 20% ntawm qhov koob tshuaj qis dua. Qhov no pab txhim kho qhov compactness thiab lub zog ntawm cov pob zeb thiab ua tau raws li qhov xav tau kev ua tau zoo ntawm cov khoom precast.

3.2. Kev ua haujlwm zoo heev thaum khaws cia poob qis

Feem ntau, kev tsim cov pob zeb ua ntej yuav tsum tau sib tov ua ntej thiab thauj mus rau qhov chaw nchuav, uas yuav tsum tau kom cov pob zeb ua kom muaj dej ntws zoo rau ib lub sijhawm. PCE hmoov muaj kev ruaj khov ntawm kev sib kis, uas ua rau qeeb qeeb thaum tsis txhob poob dej sai, ua kom cov pob zeb ua haujlwm tau zoo thoob plaws hauv kev tsim kho.

3.3. Txhim kho lub zog thaum ntxov

PCE hmoov ua kom qhov sib piv ntawm cov dej thiab cov khoom sib txuas sab hauv thiab qhov ceev ntawm cov pob zeb ua vaj tse zoo dua, thaum txhawb nqa cov tshuaj tiv thaiv dej sai dua ntawm cov cement, uas pab txhim kho lub zog thaum ntxov. Qhov kev ua tau zoo no zoo heev rau cov pwm ceev thiab cov txheej txheem tsim khoom sai ntawm cov khoom precast, luv lub sijhawm demolding thiab txhim kho kev ua haujlwm ntawm pwm.

3.4. Kev sib raug zoo nrog ntau yam khoom siv cementitious

PCE hmoov muaj kev hloov pauv zoo rau ntau hom cement thiab cov khoom sib xyaw (xws li cov tshauv ya, slag, silica fume, thiab lwm yam), thiab tsim nyog rau ntau yam kev sib xyaw tsim. Nws tuaj yeem hloov kho tau raws li qhov xav tau ntawm qhov project kom txhim kho kev ua tau zoo ntawm cov pob zeb.

3.5. Kev tiv thaiv ib puag ncig thiab cov txiaj ntsig qis carbon

PCE hmoov nws tus kheej yog cov khoom siv hauv tsev uas zoo rau ib puag ncig thiab tsis muaj cov khoom xyaw uas ua rau puas tsuaj. Nws cov txiaj ntsig zoo heev ntawm kev txo cov dej tuaj yeem txo cov dej thiab cov cement siv, yog li txo cov pa roj carbon ntawm cov pob zeb ua vaj tse, uas yog nyob rau hauv kab nrog cov qauv ntawm cov tsev ntsuab thiab kev txhim kho kom ruaj khov.

4. Cov ntaub ntawv thov tshwj xeeb ntawm PCE hmoov hauv cov khoom ua ntej

Cov pob zeb ua ntu: Cov ntu siv rau hauv cov qhov av tiv thaiv xav tau lub zog siab, qis shrinkage, thiab lub zog thaum ntxov ntawm cov pob zeb. Kev siv PCE hmoov tuaj yeem ua kom zoo, ruaj khov thiab ua haujlwm demolding ntawm cov ntu.

Kev tsim cov txaj pw: Cov txaj pw yuav tsum tiv taus cov khoom hnyav loj, xav kom cov pob zeb ua kom muaj qhov compact thiab toughness zoo. Qhov dej txo qis ntawm PCE hmoov pab txhim kho lub zog thiab kev ruaj khov.

Cov vaj huam sib luag phab ntsa ua ntej: Cov vaj huam sib luag phab ntsa ua ntej siv rau hauv cov tsev nyob ua ntej xav tau qhov zoo ntawm qhov chaw thiab qhov tseeb ntawm qhov ntev. Kev siv cov hmoov PCE tuaj yeem txhim kho qhov cuam tshuam ntawm cov pob zeb ua vaj tse.

Cov khoom PC (prefabricated concrete): Kev siv cov hmoov PCE hauv cov khoom xws li prefabricated beams thiab ntaiv tuaj yeem ua kom muaj kev sib xws thiab ruaj khov ntawm kev tsim khoom loj thiab txhim kho kev ua haujlwm ntawm kev tsim kho.

5. Cov lus qhia rau kev siv

Kev tswj cov tshuaj: Feem ntau pom zoo kom cov tshuaj PCE hmoov yog 0.1% ~ 0.3% ntawm qhov hnyav ntawm cov khoom siv cementitious. Cov tshuaj tshwj xeeb yuav tsum tau txiav txim siab raws li cov ntaub ntawv raw thiab kev xeem xav tau.

Cov xwm txheej khaws cia: Cov hmoov yuav tsum tau khaws cia rau hauv qhov chaw qhuav kom tiv thaiv kev nqus dej noo thiab kev sib sau ua ke, uas yuav cuam tshuam rau kev ua tau zoo.

Kev xeem sib xws nrog lwm cov admixtures: Kev xeem sib xws yog qhov yuav tsum tau ua thaum siv lwm cov admixtures (xws li retarders thiab expansion agents) kom tsis txhob ua tsis tau zoo.

PCE hmoovtau dhau los ua cov khoom sib xyaw tseem ceeb hauv cov khoom siv ua vaj tse precast nrog nws cov txiaj ntsig ntawm kev ua haujlwm siab hauv kev txo dej, kev tiv thaiv kev tawg, lub zog thaum ntxov thiab kev tiv thaiv ib puag ncig. Yav tom ntej, nrog rau kev txhim kho kev lag luam hauv tsev thiab cov ntaub ntawv tsev ntsuab, qhov yuav tsum tau ua rau kev ua haujlwm ntawm cov khoom precast yuav siab dua, thiab PCE hmoov yuav txuas ntxiv ua lub luag haujlwm tseem ceeb hauv kev ua kom zoo dua qub thiab kev tswj hwm ntse, muab kev txhawb nqa zoo rau kev txhim kho qhov zoo ntawm cov khoom precast thiab kev hloov pauv ntawm kev ua haujlwm ntawm lub tsev.