Ua Npuas Ncauj
1. Khoom siv vim:
Cov khoom tsis tsim nyog gradation:Raws li lub hauv paus ntsiab lus ntawm aggregate gradation thiab compactness, yog hais tias qhov gradation ntawm ntxhib thiab nplua aggregates yog tsis tsim nyog, piv txwv li, cov khoom muaj ntau yam zoo li koob, qhov gradation ntawm ntxhib aggregate tsis tau raws li qhov yuav tsum tau, ua rau ntau porosity. Loj, los yog cov xuab zeb tus nqi ntawm cov khoom thaum lub sij hawm tsim yog me me heev, yog li ntawd cov ntxhib thiab nplua aggregates tsis tuaj yeem ncav cuag qhov siab tshaj plaws compactness, uas yuav ua rau cov khoom ua rau cov voids dawb, uas muaj feem ntau yuav ua rau huab cua npuas.
Tsis tsim nyog dej-cement ratio:Thaum tsim cov pob zeb sib xyaw ua ke, qhov siab dua cov dej-cement piv ntawm cov khoom siv, cov cua npuas ntau yuav nyob rau saum npoo ntawm cov pob zeb. Qhov no feem ntau yog vim hais tias thaum lub pob zeb ncav cuag dej saturation, cov dej ntau dhau yuav sib cais rau saum npoo ntawm cov pob zeb, yuav evaporated los yog absorbed los ntawm cov pob zeb nws tus kheej thaum kho kom tsim cov npuas. Ntawm qhov tsis sib xws, yog tias cov cement ntau ntxiv thiab cov dej txo qis thaum lub zog ntawm cov pob zeb tuaj yeem lav tau, cov pa npuas yuav txo. Yog vim li cas yog tias cov cement slurry ntau dhau tuaj yeem sau qhov khoob uas tshwm sim los ntawm qhov tsis tsim nyog aggregate grading los yog lwm yam, thiab txo cov dej yuav txo tau cov pa npuas tsim los ntawm cov dej dawb.
2. Yog vim li cas rau txoj kev tsim kho
Lub sij hawm sib xyaw tsis raug: Lub sij hawm sib xyaw kuj tseem cuam tshuam rau tiam ntawm huab cua npuas hauv cov pob zeb. Thaum lub sij hawm sib xyaw ua ke ntawm cov pob zeb, yog tias qhov sib tov tsis sib npaug, nrog tib qhov dej-cement piv, cov npuas tsim nyob rau hauv ib feem nrog ntau admixture yuav nce, thaum lub unmixed ib feem yuav muaj uneven slump, loj slump poob, segregation, thiab lwm yam. Phenomenon, tab sis kev sib tov ntau dhau yuav ua rau ntau thiab ntau cov pa npuas nkag mus rau hauv cov pob zeb thaum lub sij hawm sib tov, uas yuav muaj qhov tsis zoo.
Kev co tsis txaus: Kev vibration yog ib txoj hauv kev ncaj qha kom tshem tawm cov npuas hauv cov pob zeb. Qhov siab dua qhov ua vaj tse yog vibrated, qhov zoo dua qhov compactness ntawm aggregate hais. Lub sijhawm vibrating feem ntau yog 3 ~ 5 feeb. Yog tias lub sijhawm ntev dhau lawm, cov npuas me me hauv cov pob zeb yuav tawg thiab rov tsim kho raws li kev ua haujlwm, los ntawm me mus rau qhov loj; Yog tias lub sijhawm vibrating luv luv thiab qhov chaw uas tsis vibrated yuav ua rau cov pob zeb tsis ntom ntom thiab tsim cov pores ntuj lossis cov pa npuas loj, uas ua rau cov pa npuas thiab honeycomb pockmarks ntawm qhov chaw ntawm cov pob zeb ua vaj tse.
Tsis tas li ntawd, qhov ceev ntawm lub vibrator tso rau hauv kuj muaj feem xyuam rau lub ejection ntawm huab cua npuas. Ntxig nws sai sai kom ntseeg tau tias cov pob zeb vibrated nce thiab nqis rau tib lub sijhawm. Rub nws tawm maj mam, txhawm rau ua kom txoj haujlwm ntawm lub vibrating qws sib sau ua ke thiab sau qeeb qeeb thaum lub sijhawm vibrating, tshwj xeeb tshaj yog cov pob zeb qhuav qhuav.
3. Ceev faj:
Cov khoom siv pob zeb:
(1) Tshawb xyuas cov qib zog, ntau yam thiab kev ua haujlwm ntawm cov cement siv nruj raws li qhov yuav tsum tau ua. Yog tias cov chaw tsim khoom ua vaj tse precast muaj ntau tus neeg muab khoom siv cement, cov cement uas muaj cov ntsiab lus tsis tshua muaj alkali thiab tsawg dua nto foaming yuav tsum zoo dua. Thiab lub zog qib ntawm cov cement yuav tsum sib haum nrog qib zog ntawm precast qhob mix ratio. Tsis tas li ntawd, kev siv cov khoom sib xyaw yuav tsum tau tswj xyuas nruj me ntsis kom ntseeg tau tias cov ntsiab lus ntawm cov pa ntawm cov pob zeb tsis tshaj 4 feem pua.
(2) Tsis pub dhau qhov kev tso cai los ntawm qhov tshwj xeeb, cov khoom sib xyaw nrog cov khoom loj tuaj yeem siv los npaj cov pob zeb. Qhov no yog vim hais tias qhov nce ntawm qhov loj me me tuaj yeem txo cov dej siv ntawm cov pob zeb, yog li txo cov ntshav thiab shrinkage ntawm pob zeb. Txawm li cas los xij, yog tias qhov sib xyaw ua ke loj dhau lawm, nws yooj yim los ua kom muaj kev sib cais. Yog li ntawd, nws yog ib qho tsim nyog yuav tau xaiv lub hauv paus embryo kom tsim nyog los ua kom qhov sib piv ntawm ntxhib thiab nplua aggregates nruab nrab. Cov kev qhia tshwj xeeb ntawm cov pob zeb tuaj yeem xaiv ua ke nrog cov kev tsim kho tshwj xeeb. Thaum xaiv, sim xaiv cov pob zeb uas zoo gradation thiab loj particle loj, thiaj li yuav txo tau cov cement thiab dej, txo qhov ntub dej thiab shrinkage ntawm pob zeb, thiab tseem tuaj yeem txo cov cua sov tsim thaum lub sij hawm cement hydration.
4. Txheej txheem
1) Xyuas cov formwork thiab tso tawm tus neeg saib xyuas kom zoo ua ntej kev tsim kho. Los xyuas kom meej qhov smoothness ntawm formwork nto, siv ib tug zoo tso tawm tus neeg saib xyuas kom tsis txhob sticking los ntawm cov huab cua npuas ntawm lub pob zeb nto. Thaum ua ntawv thov tus neeg sawv cev tso tawm, xyuas kom meej tias tag nrho yog ib yam, thiab nws tsis haum rau siv ntau dhau los yog tuab heev. Thaum cov pob zeb tsuas yog tshem tawm ntawm lub formwork, nws yog ib qhov tsim nyog los kho cov pitted nto, honeycomb thiab lwm yam huab cua npuas nrog ib tug sib tov slurry nrog ib tug tsim nyog viscosity, thiab ces siv cov tshem tawm formwork rau plaster thiab compact nws.
(2) Ua tib zoo saib xyuas qhov kev vibration ntawm precast pob zeb. Nws yog ib qho tsim nyog los xaiv cov cuab yeej vibrating tsim nyog, nruj me ntsis tswj lub sijhawm vibrating, tsim nyog xaiv lub vibrating vojvoog thiab vibrating zaus ntawm cov khoom vibrating, xyuam xim rau cov txheej txheem vibrating thoob plaws hauv cov txheej txheem, xyuas kom meej lub compactness ntawm cov pob zeb tom qab vibrating, thiab resolutely tsis txhob to thiab under-vibration thiab tshwm sim ntawm over-vibration. Kev vibration yuav tsum tau txais cov txheej txheem ntawm "ceev ntxig thiab tshem tawm qeeb". "Quick insertion" yog qhov tsim nyog kom tau txais lub sijhawm vibration tsis sib xws rau cov khaubncaws sab nraud povtseg sab saud thiab qis qis, thiab "slow extraction" yog qhov zoo rau kev sau qhov chaw seem ntawm lub vibrator nrog cov pob zeb slurry thiab tiv thaiv kom tsis txhob muaj cov voids, tshwj xeeb tshaj yog rau cov pob zeb nyuaj, "slow. rub" yog qhov tseem ceeb tshwj xeeb. "Slow rub" tsis yog tsuas yog ua rau kev sib sau ua ke thiab txhaws ntawm cov pob zeb slurry, tab sis kuj tuaj yeem txhawb kev khiav tawm ntawm huab cua npuas.
(3) Kev ntsuas yuav tsum raug coj mus rau qhov tsis sib xws ntawm kev faib hluav taws xob kom txo tau qhov cuam tshuam ntawm qhov kub thiab txias ntawm huab cua npuas ntawm qhov chaw ntawm cov pob zeb ua ntej. Kev thauj mus los thiab nchuav cov pob zeb ua ntej yuav tsum ua kom tau raws li qhov yuav tsum tau ua ntawm kev tsim kho. Piv txwv li, thaum lub sij hawm tsim kho nyob rau hauv lub caij ntuj sov, sunshade los yog txias ntsuas yuav tsum tau coj mus rau lub ntxhib thiab nplua aggregates ntawm pob zeb; . Tsis tas li ntawd, qee qhov kev txuag hluav taws xob yuav tsum tau ua thaum tsim kho thaum lub caij ntuj no, tshwj xeeb tshaj yog rau precast qhob pwm. Kev tsim cov txheej txheem ntawm cov khoom ua vaj tse kuj yog txheej txheem ntawm hydration cov tshuaj tiv thaiv. Cov tshuaj tiv thaiv hydration yuav tso tawm qee qhov cua sov, ua rau qhov kub ntawm qhov sib txawv ntawm cov qauv nce, ua rau muaj teeb meem xws li tawg thiab cua npuas. Yog li ntawd, kev saib xyuas ntawm cov khoom yuav tsum tau ntxiv dag zog, thiab chav kho yuav tsum tau siv ntau li ntau tau thaum lub sij hawm tu. Rau cov neeg uas tsis muaj chav kho mob, sim ua kom lub ntsej muag ntawm cov neeg ua vaj tse moist, thiab tswj qhov kub ntawm cov pwm los tiv thaiv qhov tsim ntawm qhov kub thiab txias.
