Yuav ua li cas yog daim ntawv thov yuam kev ntawm Polycarboxylic Superplasticizer?

Dab tsi yog daim ntawv thov yuam kev ntawm polycarboxylic superplasticizer?

(1) Dej-txo tus nqi hloov pauv, nyuaj rau kev tswj hauv engineering

Hauv kev tshaj tawm cov ntaub ntawv rau polycarboxylic superplasticizers, cov nyhuv dej txo qis feem ntau yog qhov tseem ceeb, nrog rau kev thov ntawm cov dej txo qis mus txog 35% lossis ntau dua 40%. Thaum kuaj sim qee zaum paub tseeb tias cov nqi siab no, qhov ua tau zoo ntawm qhov chaw tuaj yeem ua rau poob siab, qee zaum cov nqi qis dua 20%. Tus nqi txo qis dej yog ib lub ntsiab lus nruj me ntsis, ntsuas raws li cov xwm txheej tshwj xeeb, raws li GB8076 "Concrete Admixtures" tus qauv, siv cov cement hauv paus, ib qho kev sib xyaw ua ke, thiab tswj kev poob ntawm (80+10) ​​mm. Txawm li cas los xij, lo lus no nquag siv los sawv cev rau cov khoom lag luam txo cov dej hauv cov ntsiab lus sib txawv, uas feem ntau ua rau muaj kev nkag siab yuam kev. Polycarboxylic superplasticizers raug pov thawj tias ua tau zoo ntawm cov tshuaj qis dua, ua tiav cov dej txo qis dua lwm hom superplasticizers. Txawm li cas los xij, kev ua tau zoo ntawm polycarboxylic superplasticizers yog qhov cuam tshuam los ntawm kev kuaj mob piv rau lwm cov superplasticizers.

Ua ntej, qhov ua tau zoo ntawm polycarboxylic superplasticizers nyob ntawm seb hom thiab pes tsawg ntawm cov cement siv hauv cov pob zeb sib xyaw. Kev ntsuam xyuas tau ua nrog tib cov tshuaj superplasticizer tab sis sib txawv ntawm cov cement ntau ntawm 330 kg / m³, 350 kg / m³, 380 kg / m³, thiab 420 kg / m³ yielded dej-txo tus nqi ntawm 18%, 22%, 28%, thiab 35 %, feem. Thaum siv cov cement sib txawv, cov dej txo cov nqi sib txawv li ntawm 10%. Thib ob, cov ntsiab lus av nplaum ntau dua hauv cov xuab zeb ua rau cov dej txo qis rau polycarboxylic superplasticizers. Kev nce ntxiv, raws li qee zaum ua nrog naphthalene-based superplasticizers, tsis zoo rau polycarboxylic superplasticizers; Feem ntau, fluidity ua tsis tau raws li qhov yuav tsum tau ua, thiab cov pob zeb pib los ntshav. Qhov kev daws teeb meem zoo tshaj plaws yog txo cov av nplaum. Tsis tas li ntawd, cov dej-txo tus nqi rau polycarboxylic superplasticizers, zoo li lwm yam superplasticizers, nyob ntawm cov txheej txheem sib tov. Kev sib xyaw ua ke feem ntau ua rau cov dej txo qis uas yog 2-4% qis dua nrog kev sib xyaw tshuab. Tus nqi kuj cuam tshuam los ntawm hom thiab ntau npaum li cas ntawm cov khoom siv ntxiv hauv cov pob zeb. Rau kev sib xyaw ua ke ntau, polycarboxylic superplasticizers ua tau zoo dua li naphthalene-based superplasticizers.

(2) Kev siv ntau dua ntawm superplasticizer ua rau kom txo cov dej kom zoo dua

Txhawm rau tsim cov pob zeb muaj zog nrog cov dej-cement ratios qis, engineers feem ntau nce ntau npaum ntawm polycarboxylic superplasticizers rau kev ua haujlwm zoo. Feem ntau, raws li qhov ntau npaum li cas nce, yog li tus nqi txo cov dej. Txawm li cas los xij, dhau ntawm qhov ntau npaum li cas, cov nyhuv yuav zoo li txo qis. Qhov no tsis tau txhais hais tias kev txo qis dej tau poob, tab sis qhov tshwm sim los ntshav hnyav tau tshwm sim, ua rau nws nyuaj rau ntsuas qhov dej kom raug los ntawm kev poob qis. Txhawm rau kom ua tau raws li cov qauv kev sim khoom, qhov ntau npaum li cas thaum kuaj yuav tsum tsis txhob siab dhau. Yog li, cov ntawv tshaj tawm cov khoom lag luam tsuas yog cuam tshuam cov ntaub ntawv yooj yim, thaum cov txiaj ntsig ntawm daim ntawv thov tiag tiag nyob ntawm cov kev sim engineering tshwj xeeb.

(3) Cov teeb meem los ntshav pob zeb nrog Polycarboxylic Superplasticizers

Cov ntsuas kev ua haujlwm ntawm pob zeb feem ntau suav nrog fluidity, cohesion, thiab tuav dej. Qhob npaj nrog polycarboxylic superplasticizers tsis tas yuav ua tau raws li txhua qhov kev siv thiab feem ntau nthuav tawm ntau yam teeb meem. Yog li ntawd, thaum lub sij hawm sim, cov ntsiab lus xws li "mob pob zeb raug," "los ntshav," thiab "segregation" feem ntau yog siv los piav txog cov khoom vaj tse. Feem ntau cov pob zeb sib xyaw nrog polycarboxylic superplasticizers yog cov rhiab heev rau cov ntsiab lus dej; nce dej cov ntsiab lus los ntawm tsuas yog (1-3) kg/m³ tuaj yeem ua rau los ntshav hnyav, cuam tshuam rau cov dej sib xws thiab ua rau muaj qhov tsis xws luag xws li nto spalling, sandiness, qhov, thiab txo lub zog thiab kav ntev. Kev tswj tsis zoo ntawm cov dej sib xyaw ua ke hauv kev lag luam pob zeb ua lag luam tuaj yeem ua rau cov dej ntau dhau, ua rau los ntshav thiab sib cais.

(4) Polycarboxylic Superplasticizer Concrete nrog High Fluidity Prone rau Txheej thiab Segregation

Hauv ntau qhov xwm txheej, cov pob zeb ua kua dej ntau ua nrog polycarboxylic superplasticizers, txawm tias thaum tswj tau zoo rau kev siv ntau npaum li cas thiab dej cov ntsiab lus, tej zaum yuav tsis pom los ntshav tab sis tseem nyiam txheej thiab sib cais. Qhov no feem ntau manifested los ntawm lub dab dej ntawm coarse aggregate thiab floating ntawm mortar los yog muab tshuaj txhuam. Pouring xws li pob zeb, txawm tias tsis muaj kev vibration, ua rau pom tseeb txheej thiab sib cais. Qhov no feem ntau yog vim qhov txo qis hauv slurry viscosity thaum siv polycarboxylic superplasticizers nrog cov kua dej siab. Ntxiv cov tshuaj thickening tuaj yeem daws qhov teeb meem no ib nrab, tab sis cov neeg ua haujlwm no feem ntau txo cov dej-txo cov teebmeem.

(5) Tsis muaj Synergistic nyhuv nrog rau lwm hom superplasticizers

Yav dhau los, kev sib xyaw ua vaj tse tuaj yeem hloov tau yooj yim ntawm hom twj tso kua mis yam tsis muaj qhov sib txawv tseem ceeb ntawm kev sim thiab cov txiaj ntsig hauv teb. Txawm li cas los xij, nrog kev txais yuav ntawm polycarboxylic superplasticizers, inconsistencies nyob rau hauv qhob mix khoom tau tshwm sim. Cov teeb meem tsis txaus ntseeg tshwm sim, xws li kev sib xyaw qhuav txawm tias muaj dej ntau ntxiv, kev poob qis dua piv rau cov twj tso kua mis tsis tu ncua, thiab kev thauj khoom tsis zoo. Lub zog pob zeb kuj tseem yuav tsis txaus ntseeg. Cov tsoos superplasticizers, xws li lignosulfonate, naphthalene, melamine, aliphatic, thiab amino-sulfonate, tuaj yeem sib xyaw kom tau raws li cov kev xav tau tshwj xeeb, feem ntau ua rau kev ua tau zoo. Cov kev sib xyaw no feem ntau yog sib koom ua ke, tshwj tsis yog nag lossis daus me me ntawm lignosulfonate thiab naphthalene hom, uas tsis cuam tshuam rau kev siv. Txawm li cas los xij, polycarboxylic superplasticizers feem ntau tsis muaj kev sib koom ua ke thaum ua ke nrog lwm cov khoom siv superplasticizers, thiab lawv cov kev daws teeb meem muaj kev tsis sib haum xeeb.

(6) Tsis muaj kev hloov pauv cuam tshuam thaum ntxiv cov kev hloov pauv

Vim muaj kev txwv kev tshawb fawb peev, feem ntau kev tshawb fawb ntawm polycarboxylic superplasticizers tsom rau kev txhim kho plasticizing thiab dej-txo cov teebmeem es tsis yog kev txiav cov khoom lag luam rau cov kev xav tau tshwj xeeb, xws li kho lub sijhawm, cov ntsiab lus huab cua, lossis viscosity. Qhov sib txawv thiab tsis ruaj khov ntawm cov cement, cov khoom siv ntxiv, thiab cov khoom sib xyaw ua ke hauv engineering ua rau cov neeg muag khoom tsim cov khoom siv polycarboxylic superplasticizer uas tuaj yeem hloov kho raws li qhov yuav tsum tau ua. Tam sim no, kev hloov kho cov txheej txheem feem ntau yog raws li txoj hauv kev tsim rau cov tshuaj superplasticizers xws li lignosulfonate thiab naphthalene. Txawm li cas los xij, kev ntsuam xyuas qhia tau tias yav dhau los cov kev hloov kho tsis tas yuav tsim nyog rau polycarboxylic superplasticizers. Piv txwv li, cov tshuaj tiv thaiv kev tiv thaiv ntawm sodium citrate, siv tau nrog naphthalene-based superplasticizers, tsis ua haujlwm rau polycarboxylic superplasticizers thiab tej zaum yuav txawm tias qhov chaw teeb tsa. Sodium citrate kuj muaj qhov tsis zoo solubility nrog polycarboxylic superplasticizers. Tsis tas li ntawd, ntau yam defoamers, air entrainers, thiab thickeners siv nyob rau hauv cov tsoos superplasticizers tej zaum yuav incompatible nrog polycarboxylic superplasticizers. Qhov no qhia tau hais tias, vim muaj cov qauv molecular tshwj xeeb ntawm polycarboxylic superplasticizers, tam sim no kev tshawb fawb tob thiab kev tsim kho engineering tsis txaus rau kev hloov kho lawv nrog lwm cov tshuaj lom neeg. Yog li, cov txheej txheem theoretical thiab cov qauv txheej txheem los ntawm kev hloov kho superplasticizer yav dhau los yuav xav tau kev tshawb nrhiav ntxiv thiab hloov kho rau polycarboxylic superplasticizers.