Muaj ntau ntau qhov laj thawj rau kev poob qis, feem ntau ntawm cov hauv qab no:
1. Kev cuam tshuam ntawm cov khoom siv raw
Txawm hais tias cov cement siv thiab cov twj tso kua mis sib haum thiab yoog raws yuav tsum tau txais los ntawm kev ntsuas kev hloov pauv.Qhov zoo tshaj plaws ntawm tus neeg sawv cev twj tso kua mis yuav tsum tau txiav txim siab los ntawm kev ntsuas kev hloov pauv nrog cov khoom siv cementitious.Tus nqi ntawm cov pa-entraining thiab retarding Cheebtsam nyob rau hauv lub twj tso kua mis tus neeg saib xyuas muaj kev cuam tshuam ntau dua rau qhov poob ntawm pob zeb slump.Yog hais tias muaj ntau cov pa-entraining thiab retarding Cheebtsam, lub slump poob ntawm pob zeb yuav qeeb, txwv tsis pub qhov poob yuav ceev.Kev poob qis ntawm cov pob zeb npaj nrog naphthalene-based superplasticizer yog nrawm, thiab qhov poob qeeb qeeb thaum qhov kub tsis zoo yog qis dua +5 ° C.
Yog tias siv anhydrite los ua qhov kev hloov kho hauv cov cement, qhov poob ntawm cov pob zeb yuav nrawm dua, thiab lub zog thaum ntxov C3A cov ntsiab lus hauv cov cement yog siab.Yog tias siv "R" hom cement, cov cement fineness zoo heev, thiab cov cement teem sij hawm sai, thiab lwm yam. Nws yuav ua rau cov pob zeb poob qis kom nrawm, thiab qhov ceev ntawm cov pob zeb poob qis yog cuam tshuam rau qhov zoo thiab tus nqi ntawm cov khoom sib xyaw hauv cov cement.Cov ntsiab lus C3A hauv cov cement yuav tsum nyob rau hauv 4% mus rau 6%.Thaum cov ntsiab lus qis dua 4%, cov khoom siv cua nkag thiab rov qab yuav tsum tau txo, txwv tsis pub cov pob zeb yuav tsis khov rau lub sijhawm ntev.Thaum C3A cov ntsiab lus siab dua 7%, nws yuav tsum tau nce ntxiv.Huab cua-entraining retarder tivthaiv, txwv tsis pub nws yuav ua rau sai poob ntawm pob zeb slump los yog qhov teeb meem tsis tseeb.
Cov ntsiab lus av nkos thiab cov av nkos thaiv cov ntsiab lus ntawm cov ntxhib thiab nplua aggregates siv hauv cov pob zeb ntau tshaj tus qauv, thiab cov ntsiab lus ntawm crushed pob zeb koob flake hais tshaj tus qauv, uas yuav ua rau lub slump poob ntawm pob zeb kom nrawm.Yog hais tias cov coarse aggregate muaj cov dej nqus dej siab, tshwj xeeb tshaj yog cov pob zeb crushed siv, tom qab raug kub hnyiab hauv lub caij ntuj sov kub lub caij ntuj sov, thaum nws muab tso rau hauv lub tov khoom, nws yuav nqus dej ntau hauv lub sijhawm luv. ntawm lub sij hawm, ua rau kom ceev slump poob ntawm cov pob zeb nyob rau hauv ib lub sij hawm luv luv (30min).
2. Kev cuam tshuam ntawm cov txheej txheem nplawm
Cov txheej txheem sib xyaw ua ke tseem cuam tshuam rau qhov poob ntawm cov pob zeb.Cov qauv ntawm cov khoom sib tov thiab kev sib xyaw ua haujlwm zoo sib xws.Yog li ntawd, lub tov khoom yuav tsum tau kho tsis tu ncua thiab cov hniav sib tov yuav tsum tau hloov tsis tu ncua.Lub sijhawm sib xyaw ua ke yuav tsum tsis pub tsawg dua 30s.Yog tias nws tsawg dua 30s, qhov poob ntawm cov pob zeb tsis ruaj khov, ua rau muaj kev poob qis dua.
3. Cov teebmeem kub
Qhov cuam tshuam ntawm qhov kub thiab txias ntawm qhov poob ntawm cov pob zeb yog qhov kev txhawj xeeb tshwj xeeb.Nyob rau lub caij ntuj sov kub, thaum qhov kub siab tshaj 25 ° C lossis siab dua 30 ° C, qhov kev poob qis yuav nrawm dua li ntawm 50% piv nrog qhov kub ntawm 20 ° C.Thaum qhov kub qis dua +5 ° C, qhov kev poob qis yuav tsawg heev lossis tsis ploj..Yog li ntawd, thaum lub sij hawm tsim khoom thiab kev tsim kho ntawm cov twj tso kua mis, ua tib zoo saib xyuas qhov cuam tshuam ntawm huab cua kub ntawm qhov slump ntawm pob zeb.
Kev siv siab kub ntawm cov khoom siv raw yuav ua rau cov pob zeb ua kom kub thiab ua kom cov slump poob.Nws feem ntau yuav tsum tau ua kom lub pob zeb tawm kub yuav tsum nyob rau hauv 5 ~ 35 ℃, tshaj qhov ntsuas kub no, nws yog ib qho tsim nyog yuav tsum tau siv cov kev ntsuas sib xws, xws li ntxiv dej txias, dej khov, dej hauv av kom txias thiab cua sov cov dej thiab cov siv qhov kub ntawm cov khoom siv raw thiab lwm yam.
Nws yog feem ntau yuav tsum tau hais tias qhov siab tshaj plaws kev khiav hauj lwm kub ntawm cov cement thiab admixtures yuav tsum tsis txhob siab tshaj 50 ° C, thiab kev khiav hauj lwm kub ntawm cov pob zeb twj tso kua mis cua sov dej nyob rau lub caij ntuj no yuav tsum tsis txhob siab tshaj 40 ° C.Muaj ib qho tsis tseeb coagulation xeev nyob rau hauv lub tov khoom, thiab nws yog ib qho nyuaj rau tawm ntawm lub tshuab los yog thauj mus rau qhov chaw rau unloading.
Qhov siab dua qhov kub ntawm cov ntaub ntawv cementitious siv, qhov ua rau cov dej txo qis ntawm cov dej-txo cov khoom hauv cov twj tso kua mis ntawm cov pob zeb plasticization, thiab cov pob zeb poob sai dua.Qhov kub thiab txias yog proportional rau slump poob, thiab slump poob tuaj yeem ncav cuag li 20-30mm thaum lub pob zeb nce 5-10 ℃.
4. Qib muaj zog
Kev poob qis ntawm pob zeb yog cuam tshuam nrog qib zog ntawm pob zeb.Qhov poob ntawm cov pob zeb uas muaj qib siab yog nrawm dua li cov pob zeb qis, thiab qhov poob ntawm cov pob zeb crushed yog sai dua li ntawm pebble pob zeb.Qhov laj thawj tseem ceeb yog tias nws muaj feem cuam tshuam rau cov cement ib chav tsev.
5. Lub xeev pob zeb
Qhob statically poob slump sai dua dynamic.Nyob rau hauv lub dynamic lub xeev, cov pob zeb yog tsis tu ncua stirred, thiaj li hais tias cov dej-txo Cheebtsam nyob rau hauv lub twj tso kua mis tus neeg saib xyuas tsis tau tag nrho reacts nrog cov cement, uas cuam tshuam qhov kev nce qib ntawm cement hydration, yog li ntawd lub slump poob yog me me;Nyob rau hauv lub xeev zoo li qub, cov dej-txo cov khoom yog tag nrho ntawm kev sib cuag nrog cov cement, cov txheej txheem cement hydration yog nrawm, yog li cov pob zeb poob qis yog nrawm.
6. Tsheb thauj mus los machinery
Qhov ntev ntawm kev thauj mus los thiab lub sijhawm ntawm cov pob zeb sib tov tsheb, cov dej tsis pub dawb ntawm cov pob zeb clinker vim cov tshuaj tiv thaiv, dej evaporation, dej nqus ntawm cov aggregate thiab lwm yam, uas ua rau poob ntawm cov pob zeb tawg thaum lub sijhawm.Lub thoob kuj ua rau mortar poob, uas yog ib qho tseem ceeb ua rau pob zeb poob.
7. Ncuav ceev thiab sijhawm
Nyob rau hauv cov txheej txheem ntawm cov pob zeb pouring, lub sij hawm ntev rau lub pob zeb clinker kom ncav cuag lub silo nto, qhov ceev ceev ntawm cov dej dawb nyob rau hauv lub pob zeb clinker vim yog cov tshuaj tiv thaiv, dej evaporation, aggregate dej nqus thiab lwm yam yog vim li cas, ua rau poob poob. ., tshwj xeeb tshaj yog thaum cov pob zeb raug rau ntawm txoj siv conveyor, qhov chaw sib cuag ntawm qhov chaw thiab qhov chaw sab nraud yog qhov loj, thiab cov dej evaporates sai heev, uas muaj qhov cuam tshuam loj tshaj plaws ntawm qhov poob ntawm cov pob zeb.Raws li qhov ntsuas qhov tseeb, thaum huab cua kub nyob ib puag ncig 25 ℃, qhov poob ntawm qhov poob ntawm cov pob zeb clinker tuaj yeem ncav cuag 4cm hauv ib nrab ib teev.
Lub sij hawm sib xyaw ua ke yog qhov sib txawv, uas kuj yog ib qho tseem ceeb ua rau pob zeb poob.Qhov cuam tshuam me me thaum sawv ntxov thiab yav tsaus ntuj, thiab qhov cuam tshuam loj dua thaum tav su thiab yav tav su.Qhov kub thiab txias thaum sawv ntxov thiab yav tsaus ntuj yog qis, cov dej evaporation qeeb, thiab qhov kub thiab txias thaum yav tav su thiab yav tav su siab.Qhov phem tshaj qhov fluidity thiab cohesion, qhov nyuaj dua nws yog los lav qhov zoo.
Lub sij hawm xa tuaj: Plaub Hlis-01-2022