Cov Ntaub Ntawv Kawm: Cov Teeb Meem Feem Ntau Thiab Kev daws teeb meem hauv Kev Siv Polycarboxylic Acid Superplasticizers

Case: Kev tsis sib haum xeeb loj nrog qee cov cement, ua rau cov pob zeb siv tsis tau ntawm qhov chaw
Cov nroj tsuag npaj tau siv cov khoom siv polycarboxylate-based high-efficiency water reducer los tsim C50 pob zeb rau qhov chaw tsim kho siv lub npe nrov hauv zos cov cement (QL hom P·O42.5R cement). Thaum npaj qhov sib tov, qhov ntau npaum ntawm cov dej reducer yog me ntsis siab dua li rau lwm cov cements. Txawm li cas los xij, thaum sib tov, qhov poob ntawm cov pob zeb tshiab tau pom tias yog 200 hli. Thaum xa mus rau qhov chaw, lub pob zeb tsis tuaj yeem tso tawm ntawm lub tsheb. Tom qab ntxiv cov dej txo qis, qhov poob qis tau txo mus rau 170 mm, uas yog tsim nyog rau kev siv, tab sis tom qab tso tawm txog 1 cubic meter, cov pob zeb tseem tsis tuaj yeem ntws tawm. Lub tsheb yuav tsum tau rov qab mus rau cov nroj tsuag, qhov twg cov dej loj thiab cov dej me me ntawm cov dej reducer tau ntxiv kom NW nyuam qhuav tso cov pob zeb, uas yuav luag solidified nyob rau hauv lub tov khoom.
Ua rau: Tsis ua qhov kev ntsuam xyuas sib haum nrog txhua pawg ntawm cov cement ua ntej sib tov.
Kev tiv thaiv: 1. Ua kev ntsuam xyuas kev sib raug zoo nrog txhua pawg ntawm cov cement ua ntej sib xyaw nrog kev tsim qauv sib xyaw. 2. Tsis txhob siv cov cements uas muaj "coal gangue" raws li kev sib xyaw nrog polycarboxylate-based water reducers.

Case: Sudden nce hauv slump thiab los ntshav, ua rau tsis lees paub los ntawm qhov chaw tsim kho
Ib qho kev cog qoob loo npaj tau siv P·O42.5R cement los tsim C30 pob zeb nrog lub hom phiaj poob ntawm 150 mm ± 30 mm. Lub slump ntawm cov nroj tsuag tau ntsuas ntawm 180 mm. Txawm li cas los xij, thaum nws mus txog qhov chaw tsim kho, qhov slump yog 210 hli, thiab cov pob zeb tau tsis lees paub los ntawm qhov chaw. Cov pob zeb rov qab mus rau cov nroj tsuag, thiab cov slump tseem yog 210 hli, nrog rau cov tsos mob los ntshav thiab kev sib cais.
Ua rau: 1. Cov cement tau sib haum nrog cov dej reducer, thiab qhov ntau npaum li cas siab me ntsis. 2. Lub sij hawm sib tov tsis txaus, thiab qhov poob qis ntsuas ntawm cov nroj tsuag tsis cuam tshuam qhov kev poob qis tiag tiag vim lub sijhawm sib xyaw luv luv.
Kev tiv thaiv: 1. Rau cov cements rhiab heev rau cov dej reducer ntau npaum li cas yuav tsum tau kho kom haum, thiab qhov tseeb ntawm kev ntsuas yuav tsum siab. 2. Ua kom lub sij hawm sib tov kom tsawg kawg yog 40 vib nas this, qhov zoo tshaj 60 vib nas this, txawm tias cov twin-shaft mixers.

Case: Ntau npaum li cas ntawm cov dej reducer, ua rau ntau qhov npuas npuas hauv pob zeb
Ib qho kev cog qoob loo npaj tau siv cov tshuaj polycarboxylate-raws li dej reducers rau ib ntus thaum lub chaw tsim kho tau tshaj tawm tias cov phab ntsa shear muaj cov npuas dej ntau dhau tom qab tshem tawm cov formwork.
Ua rau: 1. Qhov chaw tsim kho tau yws txog qhov poob qis thiab kev ua haujlwm tsis zoo, ua rau cov neeg ua haujlwm hauv chaw kuaj mob nce cov dej txo cov tshuaj. 2. Lub chaw siv steel formwork, thiab cov pob zeb ntau dhau tau nchuav ib zaug, ua rau muaj kev vibration tsis sib xws.
Kev tiv thaiv: 1. Polycarboxylate-raws li dej reducers, zoo li naphthalene-raws li reducers, muaj qhov saturation point. Thaum qhov ntau npaum li cas mus txog qhov saturation, tsuas yog kev hloov kho hauv cov pob zeb sib xyaw lossis lwm txoj hauv kev tuaj yeem txhim kho kev ua haujlwm. 2. Txhim kho kev sib txuas lus nrog rau qhov chaw thiab xyuas kom meej tias lub qhov siab ntawm qhov pouring thiab vibration txoj kev ua raws li cov lus qhia kom raug.

Case: Kev siv dej ntau dhau, ua rau ncua sij hawm teem sijhawm
Ib qhov chaw tsim kho tau tshaj tawm tias ib feem ntawm cov pob zeb tau nchuav rau hauv cov kab teeb thiab cov slabs tsis tau teem sijhawm tom qab 15 teev. Tom qab tus kws tshaj lij los ntawm cov nroj tsuag npaj txhij tau tshuaj xyuas nws, cov pob zeb ua haujlwm tom qab 24 teev vim kev kho cua sov.
Ua rau: 1. Qhov ntau npaum li cas ntawm cov dej reducer, ua ke nrog qhov kub thiab txias thaum hmo ntuj, ua rau cov txheej txheem hydration qeeb. 2. Cov neeg ua haujlwm ntawm qhov chaw ntxiv dej rau qhov sib tov, ua kom cov dej ntau ntxiv.
Kev tiv thaiv: 1. Xyuas kom meej tias cov dej reducer ntau npaum li cas tsim nyog thiab ntsuas raug. 2. Qhia rau lub xaib kom siv cov kev ntsuas rwb thaiv tsev thiab kev kho thaum lub sijhawm kub qis, thiab ceeb toom lawv tias polycarboxylate-based water reducers yog rhiab heev rau cov ntsiab lus dej, uas yuav tsum tsis txhob raug kho arbitrarily.

Case: Loj formwork sticking tshwm sim los ntawm kev sib xyaw polycarboxylate thiab naphthalene-raws li dej reducers
Thaum lub sij hawm sim nrog polycarboxylate-raws li dej reducers, ib qho kev cog qoob loo npaj tau xa ib lub tsheb nrog polycarboxylate-raws li pob zeb mus rau qhov chaw tsim kho siv naphthalene-based pob zeb. Thaum lub formwork raug tshem tawm, qhov hnyav hnyav tshwm sim.
Ua rau: Qhov sib txawv ntawm kev teeb tsa lub sij hawm thiab shrinkage ntawm ob hom dej reducers ua rau muaj teeb meem.
Kev tiv thaiv: 1. Tsis txhob siv cov pob zeb sib xyaw nrog ntau hom dej reducers rau tib qhov ntawm cov qauv. 2. Tom qab txheeb xyuas qhov teeb meem, sib txuas lus nrog lub xaib kom ncua sij hawm tshem tawm cov formwork.

Cov ntaub ntawv: Kev sib xyaw cov pob zeb seem ntawm naphthalene-based thiab polycarboxylate-raws li kev sib xyaw ua rau ua haujlwm tsis zoo
Ib tus neeg ua haujlwm tsim khoom tau sib xyaw me me ntawm cov pob zeb uas muaj naphthalene-raws li dej reducer nrog polycarboxylate-based pob zeb. Lub slump yog 190 hli ntawm cov nroj tsuag, tab sis thaum nws mus txog ntawm qhov chaw, nws tsuas yog 100 hli thiab tsis muaj flowability, nrog nyuaj ua kom zoo compaction.
Ua rau: Cov khoom sib txawv ntawm ob qhov dej txo qis ua rau muaj kev cuam tshuam tsis zoo thaum sib xyaw.
Kev tiv thaiv: Cais cais kev siv cov dej sib txawv. Xyuas kom zoo chaw nres tsheb, tsheb thauj khoom, thiab qhov chaw faib khoom thaum lub sijhawm tsim khoom.

Case: Qhob lub zog txo qis thaum sib tov ob hom dej reducers
Ib tus neeg ua haujlwm yuam kev ntxiv me me ntawm naphthalene-raws li dej reducer rau hauv polycarboxylate-raws li dej reducer. Cov pob zeb uas tau tshwm sim tsis tau tsuas yog muaj ntau cov dej txo qis tab sis kuj ua haujlwm tsis zoo thiab poob qis sai. Lub zog ntawm cov qauv kev sim ua vaj tse yog 30% -50% qis dua lub zog ntawm tib qhov sib tov yam tsis muaj cov dej ntxiv ntxiv.
Ua rau: Qhov sib txawv ntawm cov khoom ntawm ob qhov dej reducers ua rau muaj qhov sib txawv ntawm qhov teeb tsa lub sij hawm thiab shrinkage, uas cuam tshuam rau cov pob zeb lub zog.
Kev tiv thaiv: Tam sim no, kev sib tov ob hom dej txo qis no tsis ua tau. Kev tswj hwm nruj thaum lub sijhawm tsim khoom yog qhov tseem ceeb los tiv thaiv cov xwm txheej zoo li no.