Dab tsi yog Qhov Uas Tseem Ceeb Ntawm Kev Ua Txhaum Txhaum Cai?

1.Raw Material Influence

Hauv kev tsim vaj tsev, kev sib raug zoo thiab kev hloov pauv ntawm cov cement thiab cov twj tso kua mis yog qhov tseem ceeb uas yuav tsum tau txheeb xyuas los ntawm kev sim ua kom yoog raws. Qhov ntau npaum li cas ntawm cov twj tso kua mis tsis yog txiav txim siab; nws yuav tsum tau ua tib zoo kho los ntawm kev ntsuam xyuas kev sib raug zoo nrog cov ntaub ntawv cementitious los txiav txim siab qhov kev pom zoo. Cov ntsiab lus ntawm huab cua-entraining thiab retarding Cheebtsam nyob rau hauv lub twj tso kua mis tus neeg saib xyuas ho cuam tshuam qhov poob ntawm pob zeb slump. Feem ntau, yog tias cov ntsiab lus ntawm ob lub ntsiab lus siab, qhov poob qis yuav qeeb dua. Hloov pauv, yog tias cov khoom no muaj nyob rau hauv qhov me me, qhov poob qis yuav nrawm dua. Nws yog ib qho tsim nyog sau cia tias cov pob zeb ua nrog naphthalene-based superplasticizers feem ntau pom qhov poob qis dua. Txawm li cas los xij, nyob rau hauv qhov chaw kub qis (qis dua 5 degree), tus nqi poob qis yog qeeb.

Thaum sib tham txog cov xwm txheej cuam tshuam rau kev poob qis, hom retardant hauv cov cement yog qhov tseem ceeb. Tshwj xeeb, thaum gypsum yog siv los ua ib qho retardant, nws feem ntau ua rau cov pob zeb poob qis. Tsis tas li ntawd, cov ntsiab lus ntawm lub zog thaum ntxov C3A hauv cov cement plays lub luag haujlwm tseem ceeb. Yog tias C3A cov ntsiab lus siab, lossis yog siv "R" hom cement, lossis yog tias cov cement muaj qhov zoo thiab lub sijhawm teem sijhawm ceev, nws tuaj yeem ua rau poob sai sai. Qhov tseeb, qhov ceev ntawm slump poob hauv pob zeb yog ze ze rau qhov zoo thiab ntau ntawm cov khoom sib xyaw hauv cov cement, uas tuaj yeem cuam tshuam rau kev ua vaj tse.

Yuav kom tswj tau qhov kev ua tau zoo, nws yuav tsum nruj me ntsis tswj cov ntsiab lus C3A hauv cov cement. Feem ntau, C3A cov ntsiab lus yuav tsum tau khaws cia nyob rau hauv thaj tsam ntawm 4% mus rau 6%. Yog tias cov ntsiab lus C3A qis dua 4%, peb yuav tsum tau txo cov cua nkag mus thiab rov qab cov khoom raws li. Txwv tsis pub, qhov no tuaj yeem ua rau lub sijhawm teem sijhawm ntev, cuam tshuam tsis zoo rau kev tsim kho thiab kev ua vaj tsev zoo. Ntawm qhov tod tes, yog tias C3A cov ntsiab lus siab tshaj 7%, peb yuav tsum tau ua kom cov huab cua nkag mus thiab rov qab los tiv thaiv kom tsis txhob poob qis lossis teeb tsa tsis raug, ob qho tib si yuav cuam tshuam rau kev ua tau zoo thiab kev tsim kho.

Qhov kev ua tau zoo ntawm pob zeb yog cuam tshuam los ntawm qhov zoo ntawm cov coarse thiab nplua aggregates siv. Tshwj xeeb, yog tias cov ntsiab lus av nplaum thiab cov av thaiv cov ntsiab lus dhau cov qauv, lossis yog tias cov pob zeb crushed muaj cov ntsiab lus siab ntawm cov khoom zoo li rab koob, nws yuav ua kom poob qis. Ntau qhov nyuaj, qhov nqus dej ntawm cov coarse aggregates yog qhov tseem ceeb. Tshwj xeeb tshaj yog nyob rau lub caij ntuj sov, thaum coarse aggregates xws li pob zeb crushed raug kub siab rau lub sij hawm ntev, lawv qhov kub thiab txias nce, ua rau huab cua nyob rau hauv lub pore qauv nthuav dav thiab qee cov dej noo kom evaporate, ua rau cov aggregates qhuav thiab nce lawv cov dej nqus dej. Yog li ntawd, thaum cov khoom sib xyaw no ntxiv rau hauv cov khoom sib tov, lawv sai sai nqus dej noo los ntawm cov pob zeb, ua rau poob qis hauv 30 feeb xwb, uas cuam tshuam rau kev ua haujlwm thiab kev tsim kho kom zoo.

2.Kev sib xyaw ua ke cuam tshuam

Cov txheej txheem ntawm cov pob zeb sib xyaw ua rau muaj kev cuam tshuam rau nws qhov poob qis, uas zoo sib xws tsis yog rau cov khoom siv sib xyaw, tab sis kuj rau kev ua haujlwm ntawm cov txheej txheem sib tov. Yog li ntawd, kev saib xyuas tsis tu ncua ntawm lub tshuab tov khoom yog qhov tseem ceeb tshwj xeeb, thiab cov khoom sib tov, raws li cov khoom tseem ceeb, yuav tsum tau tswj xyuas kom zoo, nrog rau lub sijhawm hloov pauv yog qhov tseem ceeb. Tsis tas li ntawd, lub sijhawm sib xyaw ntawm pob zeb yog qhov tseem ceeb. Lub sijhawm sib tov yuav tsum tsis pub tsawg dua 30 vib nas this. Yog tias lub sijhawm sib xyaw ua ke qis dua qhov pib no, cov pob zeb tawg yuav tsis ruaj khov, ua kom nrawm nrawm thiab cuam tshuam tsis zoo rau tag nrho cov pob zeb zoo.

3.Qhov kub thiab txias

Qhov kub thiab txias yog qhov tseem ceeb uas cuam tshuam rau qhov poob qis ntawm cov pob zeb. Tshwj xeeb tshaj yog nyob rau lub caij ntuj sov kub, thaum kub nce siab tshaj 25 degree lossis 30 degree, qhov poob qis ntawm cov pob zeb tuaj yeem nce siab piv rau 20 degree ib puag ncig, nrog kev nce ntau dua 50%. Qhov no cuam tshuam rau kev ua tau zoo thiab kev tsim kho ntawm cov pob zeb. Hloov pauv, thaum qhov kub poob qis dua 5 degree, qhov poob qis yog qhov me me, qhia tau tias cov pob zeb tseem ruaj khov nyob rau hauv qhov chaw qis qis. Muab qhov tseem ceeb ntawm qhov kub thiab txias ntawm qhov poob qis, kev tsim khoom thiab kev tsim kho ntawm cov twj tso kua mis yuav tsum coj mus rau hauv tus account qhov kub thiab txias.

Qhov kub ntawm cov khoom siv raw siv kuj muaj qhov cuam tshuam tseem ceeb ntawm kev ua vaj tse. Thaum qhov kub ntawm cov khoom siv raw yog siab dhau lawm, nws tuaj yeem ua rau muaj qhov kub ntawm tag nrho cov pob zeb, ua rau kom poob qis, uas cuam tshuam rau kev ua haujlwm thiab kev tsim kho kom zoo. Yog li ntawd, nws yog ib qho tseem ceeb los tswj qhov kub ntawm cov ntaub ntawv raw thaum lub sij hawm ua vaj tse.

Feem ntau, txhawm rau ua kom cov pob zeb ruaj khov, qhov kub ntawm cov pob zeb thaum nws tawm los ntawm cov khoom sib tov yuav tsum nyob rau hauv thaj tsam ntawm 5 txog 35 degree. Qhov ntau yam no suav tias yog qhov zoo tshaj plaws rau kev ua haujlwm ntawm pob zeb. Txawm li cas los xij, hauv kev xyaum, vim muaj ntau yam, qhov kub ntawm cov khoom siv raw tej zaum yuav dhau qhov ntau yam no.

Thaum cov khoom siv raw kub siab tshaj qhov zoo tshaj plaws, peb yuav tsum siv cov kev ntsuas tsim nyog los kho lawv. Piv txwv li, yog tias cov khoom siv raw kub dhau, peb tuaj yeem ntxiv dej txias, dej khov, lossis dej hauv av kom txo qhov kub ntawm cov pob zeb. Hloov pauv, yog tias cov ntaub ntawv nyoos txias dhau lawm, peb tuaj yeem ua kom sov dej los yog ua kom kub ntawm cov khoom siv raw kom nce qhov kub thiab txias.

Feem ntau, rau cov cement thiab admixtures, qhov kub thiab txias yuav tsum tau tswj nruj me ntsis, nrog rau qhov kub siab tshaj plaws ntawm 50 degree. Tshwj xeeb tshaj yog thaum lub caij ntuj no siv dej ua haujlwm, qhov kub ntawm cov dej kub yuav tsum tau ua tib zoo saib xyuas, tsis pub tshaj 40 degree. Tsis quav ntsej kev tswj qhov kub thiab txias yuav tsis tsuas yog ua kom poob qis tab sis kuj ua rau qhov chaw nrawm, ua rau muaj qhov teeb meem tsis tseeb hauv cov khoom sib tov, thiab ua rau muaj teeb meem hauv kev tso tawm cov pob zeb los yog thauj mus rau qhov chaw tsim kho.

Qhov siab dua qhov kub ntawm cov ntaub ntawv cementitious, qhov pom tseeb dua qhov txo qis hauv cov nyhuv plasticizing ntawm cov twj tso kua mis cov dej-txo cov khoom, uas ua rau kom poob qis. Tshwj xeeb, muaj kev sib raug zoo ncaj qha ntawm qhov kub ntawm cov pob zeb thiab nws qhov poob qis. Rau txhua txhua 5-10 degree nce nyob rau hauv qhov kub thiab txias, poob poob tuaj yeem ncav cuag 20-30mm, cuam tshuam rau kev ua haujlwm thiab kev tsim kho zoo ntawm cov pob zeb.

4. Qib Siab

Muaj kev sib raug zoo ntawm cov pob zeb poob qis thiab qib zog ntawm cov pob zeb. Tshwj xeeb tshaj yog, piv rau cov pob zeb uas muaj zog tsawg, cov pob zeb muaj zog muaj zog ua rau pom kev poob qis dua. Qhov tshwm sim no kuj tau pom nyob rau hauv ntau hom pob zeb, nrog rau cov pob zeb crushed uas qhia tias poob poob sai dua li pob zeb pob zeb. Lub hauv paus yog vim li cas rau qhov sib txawv no yog hais txog tus nqi ntawm cov cement siv. High-strength pob zeb feem ntau xav tau ntau cov cement kom tau raws li qhov yuav tsum tau muaj zog, thiab cov ntsiab lus cement ntau ntxiv ua rau poob qis.

5.Concrete condition

Cov pob zeb poob qis tshwm sim sai dua nyob rau hauv cov xwm txheej zoo li qub piv rau cov xwm txheej dynamic. Nyob rau hauv cov xwm txheej zoo, raws li cov pob zeb txuas ntxiv sib xyaw, cov tshuaj tiv thaiv ntawm cov dej-txo cov khoom hauv cov twj tso kua mis thiab cov cement yog hindered, tiv thaiv tag nrho hydration, thiab yog li ua kom poob qis. Hauv qhov sib piv, nyob rau hauv cov xwm txheej zoo li qub, cov khoom txo cov dej thiab cov cement muaj kev sib cuag ncaj qha, ua kom cov cement hydration, uas ua rau poob sai dua.

6.Tsheb thauj mus los Machinery

Nyob rau hauv cov txheej txheem ntawm kev thauj mus los ntev thiab ntev ntawm cov pob zeb los ntawm cov tsheb sib tov, cov pob zeb sib xyaw ua ke tuaj yeem ua rau poob dej dawb vim muaj ntau yam xws li tshuaj lom neeg, ntuj evaporation ntawm noo noo, thiab dej nqus los ntawm cov khoom sib xyaw ua ke, ua rau txo qis hauv cov tshuaj lom neeg. poob rau lub sijhawm. Tsis tas li ntawd, kev siv cov pob zeb siv los yog siv cov tshuab siv yuav ua rau poob ntawm cov tshuaj khib nyiab, uas yog lwm qhov tseem ceeb ua rau kev txo qis.

7.Pouring ceev thiab sij hawm

Lub sijhawm siv rau pob zeb los ntawm qhov chaw sib tov mus rau qhov chaw casting yog qhov tseem ceeb. Lub sijhawm txuas ntxiv yuav ua rau txo qis hauv cov dej dawb hauv cov pob zeb sib xyaw vim muaj ntau yam xws li tshuaj lom neeg tsis tu ncua, kev ya raws ntuj, thiab nqus dej los ntawm kev sib sau. Tshwj xeeb tshaj yog, thaum cov pob zeb raug rau txoj siv conveyor, qhov nce ntawm thaj chaw raug rau sab nraud ib puag ncig ua rau cov dej ntws nrawm dua, uas cuam tshuam rau kev poob qis.

Raws li cov ntaub ntawv los ntawm cov chaw tsim kho tiag tiag, thaum qhov kub ntawm ib puag ncig ntawm 25 degree, qhov poob ntawm cov pob zeb tuaj yeem txo mus txog 4cm hauv tsuas yog 30 feeb, qhia txog qhov tseem ceeb ntawm lub sijhawm hauv cov txheej txheem nchuav thiab qhov ceev ntawm kev ntsuas kom txo qis. poob poob.

Lub sij hawm ntawm pouring kuj plays lub luag hauj lwm tseem ceeb hauv slump poob. Qhov cuam tshuam nws txawv heev nyob ntawm lub sijhawm ntawm hnub. Feem ntau, nchuav thaum sawv ntxov lossis yav tsaus ntuj muaj qhov cuam tshuam tsawg dua ntawm kev poob qis vim tias qhov kub qis dua nyob rau lub sijhawm no qeeb cov evaporation ntawm cov dej, yog li txo qhov ceev ntawm cov dej dawb ploj los ntawm cov pob zeb.