Dab tsi yog cov teeb meem tshwm sim ntawm Polycarboxylic Superplasticizers siv hauv pob zeb?

1. Compatibility nrog Cement

Cov cement thiab cov ntaub ntawv sib khi muaj cov khoom sib txawv thiab sib txawv. Los ntawm qhov kev xav ntawm adsorption-dispersion mechanisms, nws yog qhov tsis muaj tseeb uas xav kom ib tus neeg ua dej txo qis kom siv tau thoob ntiaj teb. Txawm hais tias polycarboxylate superplasticizers muaj qhov sib txuam dav dua piv rau cov neeg ua haujlwm naphthalene, lawv tseem tuaj yeem pom qhov tsis zoo rau qee hom cement. Qhov kev tsis sib haum xeeb no feem ntau tshwm sim raws li kev txo cov dej txo qis thiab nce kev poob qis. Txawm hais tias tib hom cement, kev hloov pauv hauv kev ua kom zoo tuaj yeem ua rau muaj qhov sib txawv ntawm cov dej-txo tus neeg sawv cev.

Kev soj ntsuam

Nyob rau hauv ib qho chaw sib tov siv ib qho tshwj xeeb P-042.5R cement los muab C50 pob zeb rau ib qhov project, nws tau pom tias qhov yuav tsum tau noj ntawm polycarboxylate superplasticizer yog me ntsis siab dua rau lwm cov cements. Thaum sib tov, lub pob zeb poob qis tau pom qhov ntsuas ntawm 210mm; Txawm li cas los xij, thaum tshem tawm ntawm qhov chaw tsim kho, nws pom tias cov pob zeb tsis tuaj yeem ntws tawm ntawm lub twj tso kua mis. Tom qab ntxiv lwm lub thoob ntawm superplasticizer thaum sib tov, lub slump tshwm sim yog 160 hli, uas nyuam qhuav ua tau raws li qhov yuav tsum tau siv. Hmoov tsis zoo, unloading tseem ntsib teeb meem, yuav tsum tau cov pob zeb yuav tsum tau rov qab mus rau cov nroj tsuag, qhov twg ib tug loj npaum li cas ntawm cov dej thiab ib tug me me npaum li cas ntawm superplasticizer yuav tsum tau muab ntxiv los pab kom tshem tawm, yuav luag ua rau solidification nyob rau hauv lub mixing tsheb.

Ua rau Analysis

Qhov teeb meem no tau tshwm sim vim tias tsis muaj kev ua raws li kev ntsuas kev sib raug zoo nrog cov tshuaj ntxiv rau txhua pawg ntawm cov cement ua ntej sib tov.

Kev tiv thaiv

Ua kev ntsuam xyuas kev sib raug zoo nrog txhua pawg ntawm cov cement ua ntej sib tov. Xaiv cov khoom siv ntxiv uas tsim nyog; Piv txwv li, cement ua nrog "coal gangue" tsis zoo sib xws nrog polycarboxylate superplasticizers thiab yuav tsum tau zam.

2. rhiab heev rau dej ntim

Kev siv cov polycarboxylate superplasticizers tuaj yeem ua rau txo qis hauv kev siv dej, nrog rau kev sib xyaw ua ke ntawm 130 thiab 165 kg ntawm dej ib cubic meter, uas ua rau cov dej-rau-cement piv ntawm {{7} }.3-0.4, thiab qee zaum qis dua 0.3. Hauv kev siv dej tsawg, kev hloov pauv hauv cov dej ntxiv tuaj yeem ua rau muaj kev hloov pauv loj hauv kev poob qis, ua rau muaj kev poob qis thiab los ntshav sai sai.

Kev soj ntsuam

Ntawm ib qho chaw sib tov, siv ib hom cement los tsim C30 pob zeb, daim ntawv cog lus tau teev cov slump ntawm 150mm ± 30mm. Txawm li cas los xij, qhov ntsuas qhov poob ntawm lub Hoobkas yog 180mm, thiab thaum mus txog qhov chaw, nws tau ntsuas ntawm 210mm, uas ua rau tsis lees txais ob lub tsheb thauj khoom sib law liag ntawm pob zeb. Kev pov thawj ntawm lub Hoobkas tau lees paub qhov kev poob qis ntawm 210mm, nrog rau kev los ntshav thiab kev sib cais.

Ua rau

Cov cement tau pom tias muaj kev sib raug zoo nrog cov superplasticizer, tab sis qhov ntau npaum li cas siab me ntsis. Lub sijhawm sib xyaw tsis txaus ua rau qhov kev poob qis ntawm qhov tso tawm kom tsis txhob cuam tshuam qhov kev poob qis.

Kev tiv thaiv

Rau cov cements rhiab heev rau ntau npaum li cas ntawm polycarboxylate superplasticizers, xyuas kom meej tias qhov ntau npaum li cas yog qhov tsim nyog thiab qhov ntsuas qhov tseeb yog siab. Txuas lub sijhawm sib tov; Txawm hais tias muaj ob-ncej sib xyaw ua ke, lub sijhawm sib xyaw yuav tsum tsis pub tsawg dua 40 vib nas this, qhov zoo tshaj 60 vib nas this.

3. Ntau npaum li cas ntawm Polycarboxylate Superplasticizer ua rau saum npoo cua npuas

Los ntawm kev pom kev siv tau thiab ua haujlwm ntev, qhov nce me ntsis hauv cov ntsiab lus ntawm huab cua tuaj yeem tau txais txiaj ntsig. Ntau cov polycarboxylate superplasticizers muaj cov nyhuv tseem ceeb hauv huab cua. Zoo ib yam li naphthalene-based superplasticizers, cov neeg ua haujlwm polycarboxylate muaj qhov saturation point; rau ntau hom cement thiab sib txawv cov cement ntau, qhov saturation point txawv. Yog tias qhov ntau npaum li cas ntawm cov superplasticizer mus txog qhov saturation point, nws yog ib qho tsim nyog yuav tau kho cov slurry hauv cov pob zeb lossis siv lwm txoj hauv kev los txhim kho cov dej ntws.

Kev soj ntsuam

Ib qho chaw sib xyaw ua ke siv polycarboxylate superplasticizers rau lub sijhawm ntev, tab sis muaj ib hnub, qhov chaw tsim kho tau tshaj tawm cov npuas npuas ntau dhau ntawm cov phab ntsa shear tom qab tshem tawm daim ntawv, ua rau muaj qhov tsis zoo.

Ua rau

Nyob rau hnub ntawm pouring qhob, qhov chaw nquag tshaj tawm tsis tshua muaj slump thiab tsis zoo flowability. Cov neeg ua haujlwm kuaj ntawm cov nroj tsuag sib xyaw tau nce ntau npaum li cas ntawm superplasticizer. Kev tsim kho siv cov ntaub ntawv prefabricated steel, thiab cov khoom siv ntau dhau tau nchuav ib zaug, ua rau tsis sib xws.

Kev tiv thaiv

Txhim khu kev sib txuas lus nrog rau qhov chaw tsim kho, qhia kom nruj ua raws li cov txheej txheem pouring heights thiab vibration txoj kev. Kho kom muaj nuj nqis ntawm slurry nyob rau hauv lub pob zeb los yog siv lwm txoj kev los txhim kho cov flowability ntawm cov mix.

4. Kev siv ntau dhau ntawm Polycarboxylate Superplasticizer Ua rau Lub Sijhawm Ntxiv

Kev soj ntsuam

Pob zeb nthuav tawm qhov poob siab thiab siv sijhawm 24 teev kom ncav cuag qhov kawg. Tom qab nchuav pob zeb rau cov kab teeb thiab cov slabs, ib qhov chaw qhia tias ib feem ntawm cov pob zeb tsis tau teem sijhawm tom qab 15 teev. Raws li kev soj ntsuam, cov khoom sib xyaw ntawm cov engineers tau sau tseg tias nws siv sijhawm 24 teev rau cov pob zeb thaum kawg teeb tsa tom qab kev kho cua sov.

Ua rau

Cov tshuaj superplasticizer ntau dhau, thiab qhov kub tsis tshua muaj thaum hmo ntuj ua rau cov tshuaj tiv thaiv hydration qeeb. Tsis tas li ntawd, cov neeg ua haujlwm hauv qhov chaw tau ntxiv dej rau cov pob zeb uas tsis tau tso cai, ntxiv kev siv dej ntxiv.

Kev tiv thaiv

Khaws cov tshuaj superplasticizer kom tsim nyog nrog kev ntsuas meej. Ceeb toom rau qhov chaw saib xyuas qhov kub thiab txias thiab xyuas kom muaj kev rwb thaiv tsev thiab kev kho kom zoo, vim tias cov polycarboxylate superplasticizers rhiab heev rau kev siv dej thiab yuav tsum tsis txhob muaj dej ntxiv.

5. Kev siv nrog Naphthalene-based Superplasticizers

Kev soj ntsuam

Case 1: Thaum polycarboxylate superplasticizers tau siv nrog rau naphthalene-based superplasticizers ntawm tib lub ncuav, cov teeb meem adhesion hnyav tau tshaj tawm thaum tshem tawm cov ntaub ntawv phab ntsa. Thaum lub sij hawm sim theem ntawm polycarboxylate superplasticizers, pob zeb sib xyaw nrog sib txawv proportions ntawm ob tus neeg sawv cev tau muab rau ob qhov chaw sib txawv. Vim muaj hluav taws xob hluav taws xob ntawm ib qhov chaw, lub tsheb thauj khoom ntawm polycarboxylate pob zeb raug xa mus rau qhov ntawd, ua rau muaj teeb meem adhesion loj heev thaum lub sij hawm tshem tawm daim ntawv.

Case 2: Kev sib xyaw cov pob zeb seem uas muaj naphthalene superplasticizers nrog uas ua nrog polycarboxylate superplasticizers ua rau muaj kev ua haujlwm tsis zoo. Ib tus neeg ua haujlwm tsim khoom yuam kev ntxiv me me ntawm naphthalene superplasticizer rau polycarboxylate superplasticizer sib tov, ua rau cov pob zeb tawg ntawm 190 hli thaum tawm hauv cov nroj tsuag, uas poob mus rau 100 hli nrog yuav luag tsis muaj flowability thaum tuaj txog ntawm qhov chaw. Txawm tias thaum lub vibrating pas nrig raug tshem tawm, nws siv sij hawm ntau heev rau cov voids kaw.

Ua rau

Cov pob zeb sib xyaw nrog ob tus neeg sawv cev uas muaj cov khoom sib txawv tau nthuav tawm qhov sib txawv ntawm lub sijhawm thiab qhov shrinkage. Kev sib xyaw ntawm ob tus neeg ua haujlwm no ua rau muaj kev cuam tshuam tsis zoo.

Kev tiv thaiv

Cov pob zeb sib xyaw nrog ob tus neeg sawv cev ntawm cov khoom sib txawv yuav tsum tsis txhob siv rau tib qhov ntawm ib qhov project. Thaum muaj teeb meem, sib txuas lus nrog lub xaib ua ntej thiab txiav txim siab ncua kev tshem tawm daim ntawv. Ob hom superplasticizers yuav tsum tau siv sib cais, qhov zoo tshaj plaws hauv cov chaw tsim khoom sib xyaw thiab cov tsheb thauj khoom rau txhua qhov chaw.

Cov pob zeb ua nrog cov neeg sawv cev sib xyaw ua ke pom tias muaj zog txo qis. Hauv ib qho piv txwv, ib tus neeg ua haujlwm tsis tuaj yeem ntxiv me me ntawm naphthalene superplasticizer thaum lub sijhawm thauj khoom, ua rau muaj kev sib xyaw uas tsis tsuas yog muaj cov khoom siv ntxiv, tab sis kuj muaj kev ua haujlwm tsis zoo, ua rau poob sai sai thiab ncua sij hawm teem sijhawm. Lub zog ntawm cov qauv kuaj tau pom tias yog 30% -50% qis dua li cov pob zeb sib xyaw nrog tib cov cement ntau.