Polycarboxylates siv rau dab tsi?

Dab tsi yog polycarboxylates siv rau?

 

Lub polycarboxylate-based high-performance dej reducer yog lub cim thib peb ntawm cov dej ua haujlwm siab, tsim tom qab cov dej txo qis uas sawv cev los ntawm lignosulfonate thiab cov dej ua haujlwm siab uas sawv cev los ntawm cov khoom siv naphthalene. Tam sim no nws yog qhov ua tau zoo tshaj plaws, thev naus laus zis thev naus laus zis, kev cog lus, thiab ua tau zoo tshaj plaws kev ua haujlwm siab dej reducer hauv ntiaj teb. PC polycarboxylate-based high-performance water reducer sawv cev rau kev siv thev naus laus zis hauv cov dej reducers. Kev sib piv nrog cov khoom zoo sib xws hauv tsev thiab thoob ntiaj teb tau pom tias PC polycarboxylate-based high-performance water reducer tau mus txog qib siab thoob ntiaj teb tam sim no nyob rau hauv cov nqe lus ntawm kev ntsuas kev ua tau zoo thiab cov nqi-zoo.

Cov yam ntxwv ua haujlwm

• Tsawg Dosage thiab High Water Reduction Rate: Cov dej txo tus nqi tuaj yeem siab li 45%, ua rau nws tsim nyog rau kev npaj ua kom muaj zog thiab ua haujlwm siab.
• Kev poob qis tsawg: Qhov kev poob qis ntawm cov pob zeb ua ntej sib xyaw yog tsawg dua 15% hauv 2 teev, uas yog qhov zoo heev rau kev thauj mus los ntev thiab kev siv cov pob zeb ua lag luam.
• Kev ua haujlwm zoo ntawm pob zeb: Cov pob zeb npaj nrog PC polycarboxylate-raws li kev ua haujlwm siab dej txo qis tsis pom kev sib cais lossis los ntshav txawm tias nyob hauv qhov siab, thiab cov xim ntawm cov pob zeb zoo ib yam. Qhov no yog qhov zoo tshaj plaws rau kev npaj cov pob zeb ua kom muaj dej ntws zoo, ua kom nws tus kheej-leveling pob zeb, nws tus kheej-compacting pob zeb, thiab cov pob zeb ncaj ncees. Thaum siv rau cov pob zeb qib siab, nws muab kev ua haujlwm zoo thiab kev sib koom ua ke, ua rau cov pob zeb sib xyaw yooj yim.
• Low Concrete Shrinkage: Nws tuaj yeem txo qis pob zeb shrinkage, zoo heev txhim kho lub ntim stability thiab durability ntawm cov pob zeb.
• Tsawg heev Alkali ntsiab lus: Cov ntsiab lus alkali tsawg dua lossis sib npaug rau 0.2%.
• Cov khoom zoo ruaj khov: Tsis muaj sedimentation lossis crystallization tshwm sim ntawm qhov kub thiab txias.
• Environmentally Friendly: Cov khoom tsis muaj tshuaj lom thiab tsis muaj teeb meem, ua rau nws yog cov khoom ntsuab thiab ib puag ncig tus phooj ywg uas txhawb kev txhim kho kom ruaj khov.
• Cov txiaj ntsig zoo nyiaj txiag: Tag nrho qhov project nqi qis dua siv lwm hom khoom.
• Qhov teeb meem Compatibility: Qhov teeb meem tsuas yog qhov teeb meem kev sib raug zoo nrog lwm cov cement thiab cov ntaub ntawv cementitious. Polycarboxylate-raws li dej reducers yog cov feem ntau incompatible additives nrog cement. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tsum tau ua qhov kev ntsuam xyuas sib haum nrog cov cement thiab lwm cov ntaub ntawv cementitious ua ntej siv los txiav txim siab lawv cov kev ua tau zoo, uas yog qhov tseem ceeb.

Mechanism ntawm Action

Cov nyhuv txo cov dej yog lub luag haujlwm tseem ceeb ua los ntawm surfactants hauv cov txheej txheem cement hydration. Cov dej reducers tuaj yeem txo qhov kev siv dej hauv chav tsev yam tsis muaj kev cuam tshuam rau kev ua haujlwm ntawm cov pob zeb ua haujlwm lossis txhim kho kev ua haujlwm ntawm cov pob zeb yam tsis muaj kev hloov pauv chav dej. Lawv tuaj yeem ua tiav ob qho tib si ib txhij yam tsis muaj kev hloov pauv huab cua ntawm cov khoom sib xyaw. Tam sim no, tag nrho cov twj tso kua mis dej siv yog surfactants, tshwj xeeb tshaj yog anionic surfactants.

Thaum cov cement thiab dej sib xyaw, cov tshuaj tiv thaiv hydration tshwm sim, tsim qee cov qauv flocculated uas encapsulate ntau cov dej sib tov, yog li txo qhov kev ua haujlwm ntawm cov pob zeb tshiab tshiab (tseem hu ua kev ua haujlwm, uas feem ntau yog hais txog lub peev xwm ntawm cov pob zeb tshiab kom muaj kev sib koom ua ke. thiab compactness thaum lub sij hawm tsim kho, xws li kev sib tov, kev thauj mus los, thiab nchuav, tsis ua rau muaj kev sib cais). Yuav kom tswj tau qhov kev ua haujlwm uas yuav tsum tau ua thaum tsim kho, cov dej sib tov yuav tsum tau nce ntxiv. Txawm li cas los xij, nce cov ntsiab lus dej yuav tsim ntau qhov pores hauv cov qauv pob zeb cement, ua rau muaj kev cuam tshuam loj rau lub cev thiab cov khoom siv ntawm cov pob zeb tawv tawv. Yog tias cov dej encapsulated no tuaj yeem tso tawm, cov dej siv ntawm cov pob zeb yuav raug txo kom tsawg. Thaum lub sij hawm npaj ntawm pob zeb, ntxiv ib qho tsim nyog tus nqi ntawm cov dej reducer tuaj yeem ua tiav cov txiaj ntsig no.

Tom qab ntxiv cov dej reducers rau cov pob zeb, cov pab pawg hydrophobic ntawm cov dej reducers adsorb rau saum npoo ntawm cov cement, thaum cov pab pawg hydrophilic taw tes rau cov dej tov, tsim ib qho los yog ntau molecular txheej adsorption zaj duab xis. Vim yog cov kev taw qhia adsorption ntawm surfactants, nto ntawm cov cement colloidal hais yog tib yam nqi. Nyob rau hauv qhov kev txiav txim zoo li tus nqi repulsion, tsis tsuas yog cov cement-dej system tuaj yeem khaws cia rau hauv lub xeev uas muaj kev ruaj ntseg, tab sis nws tuaj yeem tawg thiab tawg cov txheej txheem flocculated tsim nyob rau hauv thawj theem ntawm cement hydration, yog li tso cov dej hauv cov dej. flocculated qauv thiab ua tiav lub hom phiaj ntawm kev txo dej.

Ntxiv cov dej reducers tsis tsuas yog txhim kho kev ua haujlwm ntawm cov pob zeb sib xyaw tshiab tab sis kuj tseem txo cov dej-cement piv hauv cov pob zeb, txo cov pore ntim hauv cov pob zeb cement, ua rau cov pob zeb cement denser thiab txhim kho lub zog compressive ntawm cov pob zeb. Qhov sib ntxiv ntawm cov dej txo qis kuj cuam tshuam rau kev ceev dej ceev thiab teeb tsa lub sijhawm ntawm cov cement, uas yog cov khoom tseem ceeb hauv kev siv tswv yim.