Kev tsom xam cov txiaj ntsig ntawm polycarboxylic acid superplasticizer

Kev ruaj ntseg ntawm polycarboxylate superplasticizers hauv pob zeb yog qhov tsis zoo, thiab ntau yam tuaj yeem cuam tshuam rau lawv cov kev ua tau zoo thiab kev ua tau zoo, xws li lwm qhov chaw ib puag ncig thiab muaj pes tsawg leeg thiab cov ntsiab lus ntawm pob zeb nws tus kheej. Txij li thaum muaj ntau yam ntawm ib puag ncig uas nyuaj rau kev tswj hwm, kev tsom xam ntawm cov yam ntxwv cuam tshuam rau kev ua haujlwm ntawm polycarboxylate superplasticizers yuav tsum tsom mus rau qhov muaj pes tsawg leeg thiab cov ntsiab lus ntawm cov khoom ua vaj tse.

Cov ntaub ntawv kev sim uas twb muaj lawm qhia tau hais tias raws li cov ntsiab lus ntawm cov cement hauv cov pob zeb nce, cov dej txo tus nqi ntawm polycarboxylate superplasticizers kuj nce ntxiv, nyob rau hauv ib qho kev sib raug zoo. Tsis tas li ntawd, polycarboxylate superplasticizers ua rau me ntsis qhuav shrinkage hauv pob zeb. Raws li kev soj ntsuam cov lus xaus thiab cov qauv, polycarboxylate superplasticizers tuaj yeem txo cov dej hauv cov pob zeb nrog cov cement siab, xws li hauv cov pob zeb uas muaj zog nrog cov dej tsawg-cement piv.

Kev ua tau zoo ntawm polycarboxylate superplasticizers kuj cuam tshuam los ntawm cov xuab zeb piv thiab particle gradation. Qhov no yog vim hais tias cov dej nqus ntawm cov aggregates sib txawv nrog cov xuab zeb sib txawv thiab particle gradations, tsis yog vim muaj tshuaj lom neeg cov tshuaj tiv thaiv ntawm polycarboxylate superplasticizer thiab ib feem ntawm cov aggregate optimizes cov qauv molecular. Qhov no ua rau txo qis hauv kev xav tau dej.

Nyob rau hauv ntau npaum li cas ntawm cov dej reducer, tus nqi ntawm polycarboxylate superplasticizer siv yog qhov ncaj qha cuam tshuam rau nws cov dej-txo cov nyhuv. Cement particles adsorb polycarboxylate superplasticizer, tsim cov qauv zoo li comb, thiab kev teeb tsa spatial ntawm cov qauv no txiav txim siab qhov siab dispersion thiab fluidity ntawm cov cement. Cov txheej txheem ntawm kev ua ntawm polycarboxylate superplasticizers, tau tham ua ntej, txhawb qhov kev txiav txim siab no.
 

Polycarboxylate superplasticizers tau nyob rau hauv txoj kev loj hlob ze li ntawm 40 xyoo. Tam sim no, lawv tab tom txhim kho sai. Raws li daim ntawv thov ntawm polycarboxylate superplasticizers hauv engineering teb txuas ntxiv nthuav dav, engineers tau tshawb pom qee qhov teeb meem hauv kev siv lawv cov tswv yim.

Polycarboxylate superplasticizers yog synthesized los ntawm ob peb lub ntsiab raw cov ntaub ntawv, thiab cov purity ntawm cov raw cov ntaub ntawv ncaj qha cuam tshuam rau stability ntawm cov khoom kawg kev ua tau zoo. Txawm li cas los xij, kev tsim cov khoom siv tseem ceeb hauv polycarboxylate superplasticizers, xws li allyl polyethylene glycol ether thiab methoxy polyethylene glycol acrylate, yuav tsum muaj cov txheej txheem siab, thiab lawv cov purity yog qhov nyuaj rau kev tswj.

Polycarboxylate superplasticizers kuj rhiab heev rau kub thiab dej cov ntsiab lus. Qhov kub thiab txias rhiab heev ntawm polycarboxylate superplasticizers tshwm sim nyob rau hauv ob txoj kev: ① Ntawm qhov kub thiab txias, ncua sij hawm tso tawm tshwm sim thaum siv hauv pob zeb engineering; ② Thaum kub dua, polycarboxylate superplasticizers tuaj yeem ua rau poob sai sai hauv pob zeb. Kho cov ntsiab lus dej los daws cov teeb meem nrog polycarboxylate superplasticizers yuav tsum muaj cov neeg ua haujlwm kuaj xyuas kom rov kho cov qauv tsim.

Ib txwm siv dej reducers tuaj yeem txhim kho qee yam kev ua vaj tse los ntawm kev sib xyaw nrog lwm cov khoom sib xyaw. Txawm li cas los xij, polycarboxylate superplasticizers muaj kev sib raug zoo tsis zoo thiab kev sib koom ua ke nrog lwm cov khoom sib xyaw ua ke, ua kom muaj txiaj ntsig zoo ua ke ntawm polycarboxylate superplasticizers nrog rau lwm cov khoom sib xyaw ua ke yog qhov teeb meem ceev yuav tsum tau daws.