Daim ntawv thov ntawm polycarboxylic acid superplasticizer hauv pob zeb

Cov dej-txo cov neeg ua hauj lwm yog ib qho tseem ceeb ntawm cov tshuaj admixtures thiab ua lub luag hauj lwm irreplaceable nyob rau hauv txoj kev loj hlob ntawm niaj hnub pob zeb. Polycarboxylate-based high-performance water-reucing agents (PCE) muaj ntau yam zoo, nrog rau kev txo cov dej siab, zoo heev slump tuav, qis shrinkage, muaj zog molecular qauv adjustability, thiab muaj peev xwm tseem ceeb rau kev ua tau zoo. Cov yam ntxwv no pab kov yeej ntau qhov tsis txaus ntawm cov tshuaj txo cov dej ib txwm muaj, ua rau PCEs yog cov khoom siv ntxiv hauv cov cuab yeej siv niaj hnub no.

Tsawg npaum li cas, siab txo tus nqi dej

Raws li cov ntsiab lus ntawm cov khoom lag luam, qhov ntau npaum li cas ntawm polycarboxylate-based high-performance water-reduced agents yog li ntawm 0.2% (0.15%-0.25%) ntawm cov qhov hnyav ntawm cov khoom siv cementitious. Ntawm qhov koob tshuaj no, piv rau cov tshuaj naphthalene-raws li cov neeg ua haujlwm, cov dej txo qis yog qhov siab dua thaum qhov ntau npaum li cas qis dua, qhia txog qhov txiaj ntsig zoo hauv kev ua haujlwm yooj yim. Qhov kev ua tau zoo ntawm cov dej txo qis kuj tseem txo cov kev taw qhia ntawm cov khoom tsis zoo rau hauv cov pob zeb.

1.Kev ua haujlwm zoo thiab khaws cia, qis qis qis

Ib qho tseem ceeb ntawm polycarboxylate-raws li kev ua haujlwm siab dej-txo cov neeg ua haujlwm yog lawv lub peev xwm los txhim kho kev ua haujlwm ntawm cov pob zeb sib tov. Lub flowability thiab khaws cia ntawm cov pob zeb sib tov uas muaj PCEs yog qhov zoo dua li cov uas muaj lwm cov dej-txo cov neeg ua hauj lwm. Pob zeb nrog PCEs tsis tshua muaj kev los ntshav, kev sib cais, lossis kev teeb tsa qeeb. Txawm li cas los xij, vim muaj ntau haiv neeg thiab cov xwm txheej ntawm cov cement hom thiab cov khoom zoo hauv Suav teb, nws yog ib qho tsim nyog yuav tsum xaiv cov khoom tsim nyog ntawm cov dej-txo tus neeg saib xyuas raws li cov cement tshwj xeeb uas tau siv, tsis yog siv nws dig muag. Ntau qhov kev xeem sib piv thiab cov ntawv thov siv engineering tau pom qhov no.

2. Muaj peev xwm ua kom muaj zog ntxiv

Cov pob zeb sib xyaw nrog hom dej-txo tus neeg sawv cev no qhia tau hais tias muaj zog ntxiv rau txhua lub hnub nyoog. Cov nyhuv tseem ceeb dua thaum cov ntxhia sib xyaw xws li yoov tshauv thiab slag ntxiv. Tau kawg, kev hloov pauv hauv hom cement, ntxhia admixtures, ntau npaum li cas, thiab lwm yam tsis ua rau muaj ntau hom polycarboxylate-raws li cov dej-txo cov neeg ua haujlwm siab, uas tuaj yeem nthuav tawm cov teebmeem sib txawv hauv kev siv engineering. Thaj chaw no xav tau kev tshawb fawb ntxiv.

3. Tsawg Shrinkage

Cov khoom siv raw xaiv thiab kev tsim qauv ntawm polycarboxylate-raws li kev ua haujlwm siab dej-txo cov neeg ua haujlwm tau txhim kho thiab txhim kho lawv cov khoom shrinkage. Kev siv thoob plaws ntawm cov khoom no tau txhim kho qhov ntim ruaj khov ntawm cov pob zeb ua kom zoo dua qub, txo qis qhov tshwm sim ntawm kev tawg ntawm cov qauv pob zeb.

4.Certain Air-Entraining Peev Xwm

Piv nrog rau lwm cov dej-txo cov neeg ua hauj lwm, polycarboxylate-raws li dej-txo cov neeg ua hauj lwm muaj peev xwm ntau dua huab cua-entraining. Lawv tuaj yeem ua kom cov cua hauv nruab nrab hauv cov pob zeb ua kom zoo, txhim khu kev ruaj ntseg ntawm cov pob zeb hauv Suav teb. Kev tshawb fawb txog kev sib raug zoo ntawm cov qauv pore thiab cov pob zeb ua kom muaj zog, thiab txawm tias kev hloov kho hauv kev tsim thiab cov txheej txheem ntawm cov dej-txo cov neeg ua haujlwm, tuaj yeem xyuas kom meej tias cov qauv pore ua tau raws li qhov yuav tsum tau ua ntawm cov pob zeb.

5.Cov ntsiab lus tsis tshua muaj Alkali tsawg heev

Cov ntsiab lus alkali nkag mus rau hauv pob zeb los ntawm cov khoom sib xyaw no tau txo qis, yog li txo qis qhov muaj peev xwm ntawm alkali-tag nrho cov tshuaj tiv thaiv thiab txhim kho cov kav ntev ntawm cov pob zeb.

6. Ib puag ncig phooj ywg

Kev sib txuas thiab tsim cov polycarboxylate-raws li kev ua haujlwm siab dej-txo cov neeg ua haujlwm tsis koom nrog kev siv formaldehyde lossis lwm yam khoom siv phom sij. Cov neeg ua haujlwm no tsis ua rau muaj kev phom sij rau kev noj qab haus huv thaum lub sijhawm tsim khoom lossis siv mus ntev thiab tsis ua rau ib puag ncig. Hauv qhov sib piv, cov dej txo qis thib ob, xws li naphthalene-based agents, yog cov khoom siv tshuaj uas ua rau muaj kuab paug ib puag ncig. Cov pa phem yog cov qauv; residual formaldehyde tseem nyob rau hauv cov txheej txheem condensation, thiab cov khoom tsis zoo xws li formaldehyde thiab naphthalene tshuav nyob rau hauv cov khoom ua vaj tse zaum kawg maj mam evaporate los ntawm cov pob zeb, ua rau ib puag ncig muaj kuab paug uas tsis tuaj yeem txo tau yooj yim.