Evolution of Concrete Technology
Kev tsim kho kev lag luam tsis tu ncua nrhiav cov ntaub ntawv uas sib xyaw ua ke lub zog, durability, thiab efficiency. Ib txwm ua pob zeb, thaum zoo heev hauv compression, raug kev txom nyem los ntawm brittleness thiab tsis tshua muaj zog tensile. Qhov kev txwv no tau txiav txim siab los ntawm qhov tshwm sim ntawm Fiber Reinforced Concrete (FRC), nrog rau Steel Fiber Reinforced Concrete (SFRC) sawv tawm raws li qhov tseem ceeb tshaj - lub zog sib xyaw. Los ntawm embedding discrete, luv steel fibers rau hauv lub pob zeb matrix, SFRC hloov mus rau hauv ib tug ductile, tawv, thiab tawg -cov ntaub ntawv resistant, ua rau nws indispensable rau niaj hnub, xav tau kev tsim kho tej yaam num.
1. Cov yam ntxwv tseem ceeb thiab kev ua tau zoo
SFRC qhov kev ua tau zoo tshaj plaws yog los ntawm kev sib koom ua ke ntawm cov pob zeb thiab cov hlau tsis sib xws. Tsis zoo li cov pa hluav taws xob ntxiv, uas tau muab tso rau hauv kev ua haujlwm, ntau lab ntawm cov hlau me me ua haujlwm thoob plaws hauv lub ntim tag nrho, muab peb - qhov sib ntxiv.
Txhim kho Mechanical Properties:Qhov txiaj ntsig tseem ceeb yog kev txhim kho tseem ceeb hauv kev tshaj tawm -kev coj tus cwj pwm. Cov fibers txuas micro- tawg uas tsim nyob rau hauv load, hloov kev ntxhov siab thiab tiv thaiv lawv los ntawm propagating mus rau hauv loj puas. Qhov no ua rau muaj zog tensile thiab flexural ntau dua, nrog rau kev txhim kho toughness thiab lub zog nqus peev xwm.
Txhim kho Durability thiab Service Life:Los ntawm kev tswj cov kab nrib pleb kom zoo, SFRC txo cov dej nkag, chlorides, thiab lwm yam aggressive agents. Qhov no txhim kho cov khoom siv tiv thaiv huab cua, kev puas tsuaj, thiab cuam tshuam, ua rau lub neej ua haujlwm ntev dua nrog txo kev saib xyuas, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav.
Economic thiab Kev Tsim Nyog Ua Haujlwm:Hauv ntau daim ntawv thov, SFRC tuaj yeem ua kom yooj yim kev tsim kho los ntawm kev txo lossis hloov cov khoom siv dag zog. Qhov no ua rau lub sijhawm tso kawm sai dua, cov nqi zog qis dua, thiab kev tuav khoom tsawg dua. Nws lub peev xwm los siv rau hauv cov ntawv thov txhaj tshuaj ntxiv ua rau kev tsim kho sai ntawm cov duab zoo li cov kab hauv kab thiab cov kab nqes stabilization.
2. Cov ntawv thov tseem ceeb hauv kev tsim kho niaj hnub
Cov khoom tshwj xeeb ntawm SFRC tau qhib cov ntawv thov tshiab thoob plaws ntau qhov chaw.
Industrial thiab Commercial Flooring:Qhov no yog ib qho ntawm feem ntau siv. SFRC slabs-ntawm- qib, nrog cov fiber ntau npaum li cas ntawm 25–40 kg/m³, muaj kev thauj khoom tshwj xeeb-cov kabmob muaj peev xwm, tsis kam ua haujlwm hnyav los ntawm forklifts, thiab txo cov kev sib koom ua ke, ua rau loj, sib koom ua ke -dawb, siab-cov khoom siv hauv tsev thiab kev ua haujlwm.
Txoj kab uas hla thiab Underground Structures:Lub ductility thiab cuam tshuam tsis kam ntawm SFRC, tshwj xeeb tshaj yog thaum siv los ntawm kev txhaj tshuaj, yog qhov tseem ceeb rau cov kab hauv ob sab phlu. Nws muab kev txhawb nqa hauv av tam sim ntawd thiab tuaj yeem tiv taus seismic kev ua si thiab pob zeb txav, ua kom muaj kev ncaj ncees thiab kev nyab xeeb.
Precast Elements thiab cov qauv tsim:SFRC txhim kho kev tuav ruaj khov ntawm precast qhob khoom thaum thauj thiab erection. Nws kuj tseem siv ntau dua hauv cov tshuab hybrid, qhov twg fibers tau ua ke nrog kev txhawb nqa bar hauv pawg - txhawb nqa slabs lossis cov tswv cuab hauv cov txheej txheem los txhim kho kev tswj kev tawg, shear resistance, thiab kev ua haujlwm raws li kev pabcuam.
Pavements thiab hnyav-Slabs:Rau lub tshav dav hlau khiav, chaw nres nkoj pavements, thiab cov chaw tub rog, SFRC qhov kev qaug zog zoo dua thiab muaj peev xwm tiv taus hnyav, rov ua dua ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev ua haujlwm ntev - kav ntev.
3. Cov kev coj ua zoo tshaj plaws rau kev qhia tshwj xeeb thiab kev siv
Txhawm rau kom ua tiav cov txiaj ntsig ntawm SFRC, ua raws li cov kev coj ua zoo tshaj plaws hauv kev tsim, sib xyaw, thiab kev tso kawm yog qhov tseem ceeb.
Tsim thiab Specification:SFRC yuav tsum tau teev tseg raws li cov kev xav tau ntawm kev ua tau zoo xws li qhov seem flexural zog (raws li cov qauv zoo li EN 14651) es tsis yog fiber ntau ib leeg. Cov qauv tsim, xws li raws li Meyerhof cov txheej txheem rau slabs, yuav tsum tau ua raws li, thiab kev sab laj nrog cov ntaub ntawv qhia txog cov txheej txheem (xws li Concrete Society TR34) yog qhov tseem ceeb.
Kev sib xyaw thiab kev ua haujlwm:Kev ua tiav cov fiber ntau dispersion yog qhov tseem ceeb. Qhov no yuav tsum muaj sijhawm sib xyaw kom txaus. Txhawm rau tiv thaiv qhov txo qis ua haujlwm los ntawm cov fibers, kev siv cov superplasticizers thiab siab -cov dej reducers yog pom zoo kom tswj kom haum rau qhov chaw tsis muaj kev sib cais.
Kev Tso Npe, Ua tiav, thiab Kho:Thaum muab tso rau, yuav tsum tsis txhob muaj kev vibration ntau dhau los tiv thaiv kev sib cais ntawm fiber ntau lossis kev sib dhos. Finishing with steel trowels is standard for floors to achieve a dense, wear-resistant surface. Kev kho kom zoo-los ntawm kev khaws cov dej noo los yog kho cov khoom sib txuas- yog qhov tseem ceeb los txo cov yas shrinkage thiab xyuas kom muaj zog.
Lub neej yav tom ntej tau tsim los ntawm kev muaj zog thiab kev ua haujlwm siab
Steel Fiber Reinforced Concrete sawv cev rau ib qho tseem ceeb leap rau pem hauv ntej hauv kev tsim khoom siv technology. Nws tsis yog tsuas yog cov khoom siv rau kev tswj kev tawg tab sis siab - lub zog sib xyaw ua haujlwm rau kev ua haujlwm tseem ceeb hauv ntau qhov kev thov kev thov. Raws li cov qauv tsim cov cai hloov zuj zus thiab kev paub dhau los, SFRC tau npaj los ua ib qho tseem ceeb tshaj plaws hauv kev tsim kom muaj zog, muaj txiaj ntsig, thiab muaj kev ruaj ntseg ntawm lub neej yav tom ntej. Rau cov engineers thiab specifiers, nkag siab txog nws cov yam ntxwv, kev siv, thiab kev siv cov txheej txheem yog qhov tseem ceeb rau kev siv nws lub peev xwm rau kev tsim kho niaj hnub no.