UHPC yog dab tsi?
UH hauv UHPC yog cov ntawv luv ntawm cov kab lus (Ultra-High), uas yog hais txog qib siab tshaj plaws.
Lo lus P (Performance) txhais tau hais tias kev ua tau zoo thiab kev ua tau zoo
C stands rau Concrete
UHPC hais txog "Ultra-High Performance Concrete"
UHPC muaj zog npaum li cas?
Txij li thaum UHPC yog cov pob zeb ua haujlwm siab tshaj plaws, nws qhov kev ua tau zoo npaum li cas? Judging los ntawm lub ntsiab compressive zog ntawm qhob, lub compressive lub zog ntawm cov pob zeb zoo tib yam yog hais txog 15Mpa-30Mpa, thaum lub compressive zog ntawm npua hlau, uas yog heev nyuaj nyob rau hauv peb lub neej niaj hnub, feem ntau yog 200Mpa. Nws tau hais tias UHPC muaj lub zog siab tshaj plaws tab sis tuaj yeem ncav cuag 810Mpa daim duab. Nws tuaj yeem hais tias cov pob zeb zoo tib yam yog "tsib scum" nyob rau hauv pem hauv ntej ntawm UHPC.
Qhov "siab" ntawm ultra-high pob zeb (UHPC) tsis yog ib qho kev muaj peev xwm compression xwb.
"Peb Siab" ntawm UHPC
"Ultra high-performance pob zeb" yog lub npe hu rau nws "peb highs": siab zog, siab durability, thiab siab workability.
"siab zog"
Raws li tau hais los saum no, qhov siab tshaj plaws compressive zog ntawm UHPC tuaj yeem ncav cuag 810Mpa. Vim hais tias cov txheej txheem ntawm txhua lub teb chaws txawv heev, UHPC kuj yuav tsum muaj qhov tsawg kawg nkaus compressive zog ntawm ntau tshaj 150 Mpa, shear lub zog ntawm ntau tshaj 25 Mpa, thiab thermal rwb thaiv tsev siab thiab siab Waterproof, zoo zoo nkauj, uas yog yooj yim cais tag nrho cov teeb meem. xov xwm. Nws muaj peev xwm hais tias nws yog ib tug dawb jade ncej tuav lub ntuj, ib tug liab doog golden beam txhawb lub hiav txwv, thiab nws tus kheej nqa lub ntuj.
"High durability"
Ib txwm ua vaj tse inevitably muaj ntau qhov sib txawv. Nyob rau hauv cov ntaub ntawv ntawm qhov kub los yog tsawg, los nag tsis tu ncua, los yog lub hnub ci ci, qhov khoob yuav nthuav ntxiv thiab lub neej kev pab yuav luv. UHPC nws tus kheej yeej tsis muaj qhov khoob. Txawm hais tias qhov sib txawv me ntsis yog tshwm sim los ntawm cov rog sab nraud, UHPC kuj muaj peev xwm kho tus kheej zoo.
UHPC yog thawj zaug siv hauv kev tsim kho choj los txo qhov hnyav ntawm cov qauv thiab txhim kho kev pabcuam lub neej thiab kev ua haujlwm ntev ntawm cov qauv. Lub neej kev pabcuam tuaj yeem ncav cuag ntau tshaj 100 xyoo.
"High workability"
Tsis zoo li cov pob zeb tsoos, uas yog "tuab, loj, tuab, thiab hnyav", UHPC tso siab rau nws lub cev muaj zog ua kom cov qauv tsis tshua muaj hnyav thiab muaj qhov pom kev zoo nkauj. Nrog nws cov kev ua tau zoo heev, cov neeg tsim qauv tuaj yeem paub lawv cov kev xav qus.
UHPC muaj kev kub siab siab, qhov ua tiav siab ua tiav, kev nplua yam zoo, thiab sov thiab zoo li zoo li xav. Ordinary qhob yog ntxhib tag rau pem hauv ntej ntawm UHPC. Tsis tas li ntawd xwb, qhov porosity ultra-low kuj ua rau UHPC tsis tshua muaj paug, ua kom huv thiab tu yooj yim dua.
Vim li cas UHPC thiaj li muaj zog?
Cov pob zeb tsoos feem ntau yog npaj los ntawm cov cement, admixtures, xuab zeb thiab gravel, dej, thiab lwm yam khoom xyaw hauv ib qho kev faib ua feem. Tom qab sib tov thiab kho qee yam, cov khoom siv cement-based composite feem ntau yog tsim los ntawm cov khoom sib xyaw (xuab zeb thiab gravel) thiab cov cement slurry yog tsim. Txawm li cas los xij, lub cev thiab cov khoom siv ntawm cov tsoos pob zeb sib sau ua ke thiab cov cement slurry yog qhov sib txawv heev, uas feem ntau txwv los ntawm peb yam hauv qab no:
Ua ntej, vim qhov thermal expansion thiab contraction ntawm cov dej hauv cov cement slurry ntawm qhov kub los yog qis, qhov khoob yuav tshwm sim ntawm qhov sib sau thiab cov cement slurry.
Qhov thib ob, lub hardness ntawm cov aggregates feem ntau yog tsim los ntawm cov xuab zeb thiab gravel tsis siab thiab lub ntim loj yuav ntxiv cov kab nrib pleb nyob rau hauv kev siv ntawm sab nraud quab yuam. Feem ntau hais lus, qhov loj dua qhov ntim ntawm cov aggregate, qhov ntau dua qhov tawg.
Thib peb, cov txheej txheem sib xyaw ntawm cov tsoos pob zeb yog ntxhib, yog li kev txhawb nqa aggregates hauv cov cement slurry tsis sib npaug thiab cov porosity yog qhov siab, uas ua rau txo qis compressive peev xwm ntawm cov pob zeb.
Qhov no ua rau cov pob zeb ib txwm muaj nkig, nrog kev ua haujlwm tsis zoo thiab tsis muaj zog. Lub siab ua haujlwm tsuas yog 20Mpa-30Mpa.
• Txhawm rau txhim kho kev ua tau zoo ntawm pob zeb, peb feem ntau pib los ntawm peb lub ntsiab lus hauv qab no:
1. Txo cov dej noo hauv cov pob zeb kom ntau li ntau tau.
2. Nrhiav cov khoom me me thiab tawv dua li cov khoom sib sau ua ke.
3. Txo cov porosity thiab ua rau kev faib tawm ntawm cov aggregates, xov xwm, thiab lwm yam.
"Dej-txo tus neeg saib xyuas txo cov dej noo"
"Ultra-fine hmoov txhim kho qhov ntom ntom"
Nyob rau xyoo 1970, Danes tau txhim kho lub zog ntawm pob zeb los ntawm kev ntxiv cov tshuaj txo cov dej thiab cov hmoov zoo rau pob zeb. Dej-txo admixtures ho txo cov dej noo cov ntsiab lus hauv pob zeb. Ultra-nplua hmoov yog ntxiv rau cov khoom xyaw ua ke ua ib qho kev sib xyaw. Los ntawm kev sib xyaw kom txaus, nws tuaj yeem txo qhov sib txawv ntawm cov khoom sib xyaw, txo qhov zoo ntawm cov cua sib xyaw, thiab txhim kho qhov ntom ntawm cov khoom.
Cov pob zeb kho los ntawm txoj kev saum toj no hu ua HPC (high-strength concrete). Raws li txoj cai, qhov compressive tsis kam ntawm HPC tuaj yeem ncav cuag lub zog ntawm 120MPA (tuaj yeem tiv taus 120 tons ntawm quab yuam ib square meter).
"Dej-txo tus neeg saib xyuas txo cov dej noo"
"Ultra-fine hmoov txhim kho qhov ntom ntom"
Nyob rau xyoo 1970, Danes tau txhim kho lub zog ntawm pob zeb los ntawm kev ntxiv cov tshuaj txo cov dej thiab cov hmoov zoo rau pob zeb. Dej-txo admixtures ho txo cov dej noo cov ntsiab lus hauv pob zeb. Ultra-nplua hmoov yog ntxiv rau cov khoom xyaw ua ke ua ib qho kev sib xyaw. Los ntawm kev sib xyaw kom txaus, nws tuaj yeem txo qhov sib txawv ntawm cov khoom sib xyaw, txo qhov zoo ntawm cov cua sib xyaw, thiab txhim kho qhov ntom ntawm cov khoom.
Cov pob zeb kho los ntawm txoj kev saum toj no hu ua HPC (high-strength concrete). Raws li txoj cai, qhov compressive tsis kam ntawm HPC tuaj yeem ncav cuag lub zog ntawm 120MPA (tuaj yeem tiv taus 120 tons ntawm quab yuam ib square meter).
"Steel fiber ntau zog"
"Active hmoov txhim kho fusion"
Nyob ib ncig ntawm xyoo 1990, cov hmoov ntxhia ntxhia xws li silica fume thiab cov hmoov ntxhia tau siv los ua cov khoom sib xyaw ua ke ultrafine steel fibers tau siv los hloov cov tsoos coarse aggregates, thiab ultrafine active hmoov tau ntxiv los tshem tawm qhov tsis xws luag ntawm cov khoom. poob rau qis tshaj. Hlau fiber ntau muaj zog dua thiab ntim me me. Cov ntxhia ntxhia hmoov xws li silica fume thiab ntxhia hmoov tuaj yeem ua tiav qib siab ntawm fusion ntawm cov ntaub ntawv. Tom qab kev saib xyuas mus sij hawm ntev nyob rau hauv qhov kub thiab txias ib puag ncig, cov pob zeb tuaj yeem ua microscopically Structurally optimal. Txawm tias me me kab nrib pleb nyob rau hauv cov khoom yuav maj mam kho lawv tus kheej nyob rau hauv qhov kev txiav txim ntawm active mineral hmoov.
"High-pressure molding"
"High-kub txij nkawm"
Vim tias cov hmoov ntxhia nquag ua lub luag haujlwm tseem ceeb hauv tag nrho cov txheej txheem, cov pob zeb ntawm lub sijhawm no yog hu ua RPC (Reactive Poeder Concrete) reactive hmoov pob zeb. Cov pob zeb no tuaj yeem muaj lub cev muaj zog ultra-siab thiab tseem hu ua UHPC.
Feem ntau, RPC (reactive hmoov pob zeb) tuaj yeem muab faib ua ob theem raws li kev kho mob sib txawv. Tom qab kho rau li 3 hnub ntawm 20 degree -90 degree, lub zog compressive ntawm RPC tuaj yeem ncav cuag 200 MPA (lub zog tuaj yeem nqa tau 200 tons ib square meter). ), hom pob zeb no hu ua PRC200. Yog tias RPC tsim los ntawm kev kub siab (lub porosity ntawm UHPC yog qis dua hauv siab) thiab kho ntawm 250 degree -400 degree, lub zog compressive ntawm RPC tuaj yeem ncav cuag 500MPA-800MPA. Hom pob zeb no hu ua PRC800.
Muaj qhov sib txawv loj hauv qib ntawm kev siv tes ua haujlwm thiab kev tshawb fawb thiab thev naus laus zis ntawm cov teb chaws, thiab tseem muaj qhov sib txawv loj hauv cov qauv kev ntsuas ntawm UHPC ntawm cov teb chaws. Feem ntau hais lus, pob zeb nrog lub zog compressive tshaj 150 MPA tuaj yeem hu ua pob zeb ua haujlwm siab (UHPC).
"Cov kev txwv tsis sib xws ntawm UHPC"
Feem ntau hais lus, yog UHPC xav kom ua tiav lub zog muaj zog, nws yuav tsum muaj qee qhov kub thiab txias thermal curing raws li qhov tsim nyog. Ntawm qhov tod tes, steel fibers zoo li agglomerate thaum lub sij hawm sib tov, yuav tsum tau loj-scale kev sib tov khoom. Cov kev tsim kho no yog qhov nyuaj rau kev ua tiav rau ntawm qhov chaw pouring. Qhov no kuj ua rau lub fact tias feem ntau UHPCs yog prefabricated qhov chaw uas yuav tsum tau npaj ua ntej nyob rau hauv lub Hoobkas, thiab tus nqi yuav siab heev.
Tus kws kos duab txawj ntse Rudy Ricciot1 ib zaug hais txog UHPC (Ultra High-Performance Concrete), "Peb tsis paub tias cov khoom no yuav coj peb mus deb npaum li cas, tab sis peb tuaj yeem hloov lub ntiaj teb ua ke." Tseeb tiag, Lub zog ntawm thev naus laus zis zoo li tus choj, coj cov neeg tsim qauv mus rau lub nceeg vaj ntawm kev muaj tswv yim.
