Yuav ua li cas sulfate ions cuam tshuam polycarboxylate dej reducers?

Vim yog qhov tsis txaus siab ntawm polycarboxylate cov roj teeb, thiab cov dej tsis yeem yog cov roj xis nyob hauv qabent cov roj yuav tswj tau kev sib faib rau lub sijhawm ntev thiab haum rau ntau hom Maas. Nws yog qhov zoo dua rau cov dej ua haujlwm siab zoo li naphthalene, tab sis qhov no tsuas yog txheeb ze.

Hauv kev sim rau kev sib xyaw ntawm Polycarboxylate-raws li cov dej reducers uas yog qhov ua tau zoo tshaj 20%, thaum cov dej polycarbox tsis yog haum saum 13%. Qhov no qhia tau tias cov dej polycarboxylate-based-based dej kuj muaj cov teeb meem zoo hloov tau nrog cov cement. Raws li qee tus kws tshuaj ntsuam tau taw qhia, nws tsis haum rau txhua hom Maas.

Kev cuam tshuam ntawm cov xis nyob ntawm qhov sib xws ntawm cov ntxhib cov txiv ntoo, cov ntsiab lus alkali hauv cov cement, hom, muab tshuaj, thiab solubility ntawm Maas retarders, thiab hom Maas. Tshwj xeeb, cov ntsiab lus C3A ntau dua ntawm Caas, cov loj dua cov ntsiab lus alkali, qhov tsis zoo ntawm cov cua ntsawj ntshab.

Cov ntsiab lus hais saum toj no kuj cuam tshuam rau kev ua tau zoo ntawm polycarboxylate-raws li cov dej reducers siab. Ib qho teeb meem tseem ceeb tshaj plaws yog tias sulfate ion cov ntsiab lus hauv kev ua tau zoo ntawm polycarboxylate-raws li dej reducers. Qhov no feem ntau yog vim muaj sulfate ions sib tw nrog polycarption-raws li kev ua kom muaj kev sib tw ntawm polycarboxylate-based dej reducers. Yog li ntawd, thaum cov ntsiab lus ntawm cov xyoob ntoo hauv cov cement yog qhov siab, raws li cov dej reduced ntawm polycarboxylate yuav ua rau muaj kev sib raug zoo ntawm polycarboxylate yuav ua rau muaj kev sib cais siab, thiab kev sib txawv yuav tshwm sim tom qab lub sijhawm.

Nws kuj tau pom zoo tias thaum muaj ntau qhov ntau ntawm sulfate ions yog tam sim no hauv dej, ua kom cov roj pleev cov nyhuv ntawm EO. When cement with high sulfate content is mixed with naphthalene-based high-performance water reducers, the hydration of C3A is inhibited by sulfur trioxide, thus improving the workability of the concrete.