Teeb meem nyob rau hauv daim ntawv thov ntawm polycarboxylate superplasticizer thiab tshuaj xyuas ntawm compounding technology
Oct 15, 2022
1 Kev Taw Qhia
Kev tsim kho kev lag luam yeej ib txwm suav tias yog ib qho ntawm cov kev lag luam tseem ceeb uas ua rau ib puag ncig tsis zoo. Nyob rau hauv kaum xyoo dhau los, qhov ntsuas ntawm kev tsim kho hauv Suav teb tau dhau los ua qhov loj thiab loj dua, thiab tib lub sijhawm, cov phiaj xwm loj niaj hnub no tau muab cov kev xav tau siab dua thiab siab dua rau kev ua tiav ntawm cov pob zeb. Yog li ntawd, pob zeb yuav tsum tau tsim nyob rau hauv cov kev taw qhia ntawm greenness, kev lag luam, siab zog thiab durability. Yog li ntawd, kev sib xyaw ua ke nrog rau cov superplasticizers kuj tseem ua lub luag haujlwm tseem ceeb hauv cov haujlwm yav tom ntej. Txoj kev loj hlob ntawm superplasticizers feem ntau tuaj yeem muab faib ua peb theem: thawj tiam ntawm cov superplasticizers uas sawv cev los ntawm ntoo calcium; thib ob tiam ntawm superplasticizers sawv cev los ntawm naphthalene series thiab thib ob tiam ntawm superplasticizers sawv cev los ntawm polycarboxylic acid series. Qhov thib peb tiam high-performance superplasticizer theem. Vim cov khoom siv thiab kev ua haujlwm tsis zoo ntawm thawj ob tiam ntawm lignosulfonate-raws li cov neeg ua dej txo qis thiab naphthalene-based high-efficiency dej-txo cov neeg ua haujlwm, lawv tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm kev tsim kho niaj hnub no. Nyob rau xyoo 1990, cov polycarboxylate superplasticizer tshwm sim yog qhov tsim nyog rau kev tsim kho cov phiaj xwm niaj hnub vim nws cov yam ntxwv zoo thiab kev tiv thaiv ib puag ncig zoo. Polycarboxylate superplasticizers muaj cov ntsiab lus tsis zoo ntawm cov khoom tsis zoo, tsis muaj ntau npaum li cas, tab sis cov dej txo qis, zoo slump tuav kev ua tau zoo, txo qis thiab nce lub zog. Cov yam ntxwv zoo heev no ua rau lawv ceev ceev ntawm kev lag luam ntawm superplasticizers. daim ntawv thov rau tej yaam num.
kuv lub teb chaws peb Gorges Project, Beijing TV Center, Hangzhou Bay Choj thiab lwm yam kev tsim vaj tse loj tau siv polycarboxylate dej reducers. Nws tsis yog qhov nyuaj kom pom los ntawm cov haujlwm no uas polycarboxylate water reducers Muaj ntau chav rau kev txhim kho hauv kuv lub teb chaws yav tom ntej. Nyob rau hauv lub neej yav tom ntej, daim ntawv thov sib txawv ntawm polycarboxylate superplasticizers yog khi rau hloov los ntawm cov haujlwm loj yav dhau los mus rau cov haujlwm dav dav thiab cov haujlwm dav dav.
2 Kev tshawb fawb cov xwm txheej ntawm polycarboxylate superplasticizers hauv tsev thiab txawv teb chaws
2.1 Cov xwm txheej tam sim no ntawm kev tshawb fawb txawv teb chaws
Nyiv yog thawj tus tsim thiab txhawb nqa daim ntawv thov ntawm polycarboxylate superplasticizers. Raws li thaum ntxov xyoo 1986, Nippon Shokubai Co., Ltd. yog thawj tus ua tiav kev tsim cov polycarboxylic acid-based superplasticizer nrog qee qhov kev faib ua feem ntawm hydrophilic functional pawg. s kev txhawj xeeb. Tom qab ntawd nws tau maj mam siv rau hauv qhov tseeb pob zeb engineering. Xyoo 1995, tus nqi ntawm polycarboxylic acid-based superplasticizers hauv Nyij Pooj deb tshaj li ntawm naphthalene-based superplasticizers, suav txog li 80 feem pua ntawm kev ua lag luam. Nyiv lub npe hu ua polycarboxylate superplasticizer li high-efficiency AE superplasticizer, thiab nws tau suav nrog JISA6024 lub teb chaws tus qauv thiab kev lag luam tus qauv hauv 1995 thiab 1997, raws li. Hauv Tebchaws Europe thiab Tebchaws Meskas, kev tshawb fawb ntawm polycarboxylate superplasticizers pib tom qab Nyiv, thiab Tebchaws Meskas thiab lwm lub tebchaws muaj kev xav ntau dua los kawm txog kev txo cov dej, kev poob qis, thiab kev ua haujlwm ntawm cov pob zeb tshiab tom qab siv polycarboxylate superplasticizers. Los ntshav thiab lwm yam teeb meem, tab sis nws qhov kev siv tag nrho yog tsawg dua Nyiv, suav txog tsuas yog 20 feem pua.
T.Hirata et al. synthesized ib tug tshwj xeeb dej-soluble amphoteric copolymer dej reducer, uas yog feem ntau siv rau high-kev ua tau zoo los yog ultra-high-kev ua tau zoo pob zeb. Thaum cov dej-txo cov ntsiab lus nce mus txog 0.9 feem pua -1.1 feem pua, cov dej-binder piv yog 0.12-0.16, thiab cov xuab zeb piv yog 38 feem pua, cov slump tseem tuaj yeem khaws cia siab tshaj 250mm rau 2 teev, thiab qhov nthuav dav tuaj yeem ncav cuag 600mm. Lub sijhawm teeb tsa yog nyob rau hauv 24h, thiab tsis muaj qhov tshwm sim sib cais, thiab 90-hnub compressive zog yog siab tshaj 180MPa.
