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Kawm txog qhov cuam tshuam ntawm PVA fiber ntau ntev thiab cov ntsiab lus ntawm engineering cement matrix composite kev ua tau zoo cuam tshuam
Cov nyhuv ntawm polyvinyl cawv (PVA) fiber ntau thiab ntev ntawm fluidity, flexural thiab compressive zog ntawm engineering cement-based composite (ECC) tau kawm los ntawm lub rooj dhia kev sim thiab flexural compressive zog test. Cementitious Composite (ECC) yog ib yam tshiab ntawm fiber reinforced cement-based khoom. Cov txiaj ntsig tau pom tias ntxiv PVA fiber ntau tuaj yeem txo qhov fluidity thiab poob ntawm ECC. Txawv PVA fiber ntau ntev txo ECC fluidity thiab slump, tab sis tsis muaj kev sib raug zoo ntawm fluidity thiab fiber ntev. Qhov sib ntxiv ntawm PVA fiber ntau tuaj yeem txhim kho lub zog flexural ntawm ECC. Qhov loj dua cov ntsiab lus fiber ntau, qhov pom tseeb tshaj qhov ua tau zoo yog; thiab qhov ntev ntawm fiber ntau, qhov ntau dua lub zog flexural. Qhov sib ntxiv ntawm PVA fiber txo qhov compressive zog ntawm ECC, tab sis rau qhov tsawg dua.
Kawm txog kev sib xyaw ua ke ntawm PVA fiber ntau cement stabilized crushed pob zeb
Txhawm rau kawm yuav ua li cas sib npaug PVA fiber ntau hauv cov cement stabilized crushed pob zeb hauv paus khoom, peb lub tuam txhab tau ua ntau yam kev sib xyaw tshuab los ntxiv PVA cement stabilized crushed pob zeb sib tov. Lub uniformity ntawm PVA fiber ntau cement stabilized crushed pob zeb yog txiav txim los ntawm qhov sib txawv coefficient ntawm loj feem piv coefficient thiab loj feem piv coefficient.. Cov txiaj ntsig tau pom tias qhov loj ntawm qhov sib piv coefficient ntawm qhov sib tov yog feem ntau loj dua li ntawm PVA fiber ntau thaum qhov loj ntawm qhov sib piv coefficient zoo li ruaj khov nyob rau hauv qhov sib txawv pub noj.. Los ntawm qhov kev xav ntawm kev sib xyaw stability ib leeg, Qhov zoo tshaj plaws noj ib ntus ntawm PVA fiber ntau cement stabilized crushed pob zeb yog muab aggregate thiab PVA fiber ntau pob ua ntej, thiab tom qab ntawd ntxiv cov cement thiab dej kom txuas ntxiv sib xyaw. Lub sij hawm sib xyaw ua ke thaum qhov loj feem piv coefficient sib txawv coefficient thiab PVA fiber ntau sib txawv coefficient nce mus txog qhov tsawg kawg nkaus tus nqi nce nrog qhov nce ntawm ib qho stirring kom muaj nuj nqis thiab txo nrog qhov nce ntawm stirring ceev.. Nws raug pom zoo tias qhov zoo tshaj plaws ib leeg-tshuab stirring ntim V = 615l, Qhov zoo tshaj plaws stirring ncej tig ceev yog omega = 48 rpm ua, thiab lub sijhawm sib xyaw zoo tshaj plaws yog 35s rau wdz-600 hom ruaj khov av sib xyaw chaw nres tsheb. Cov ntsiab lus tshwj xeeb yog raws li hauv qab no:
1) Raws li kev pub mis sib txawv, Thaum lub dispersion coefficient ntawm huab hwm coj feem ratio coefficient ntawm kev sib tov zoo li ruaj khov, Nws yog feem ntau loj dua qhov loj dispersion coefficient ntawm PVA fiber ntau. Los ntawm qhov kev xav ntawm kev sib xyaw stability ib leeg, Qhov kev noj zaub mov zoo tshaj plaws ntawm PVA fiber ntau cement stabilized crushed pob zeb yog thawj zaug muab tso rau hauv aggregate thiab PVA fiber ntau pob rau do. 5 s, thiab tom qab ntawd ntxiv cov cement thiab dej kom txuas ntxiv sib xyaw, thiab lub sijhawm zoo sib xyaw yog 30 s.
2) Lub sij hawm sib xyaw thaum qhov loj feem piv coefficient sib txawv coefficient thiab PVA fiber ntau sib txawv coefficient tus nqi nce mus txog qhov tsawg kawg nkaus tus nqi nce nrog qhov nce ntawm qhov sib tov ntim.. Qhov zoo tshaj plaws kev sib xyaw ntim ntawm wdz-600 stabilized av tov chaw nres tsheb yog V = 0. 9V0. Qhov ntawd yog, V = 615 L, thiab nws lub sijhawm zoo sib xyaw yog 35 s.
3) Sib tov lub sij hawm thaum huab hwm coj feem piv coefficient sib txawv coefficient thiab PVA fiber ntau sib txawv coefficient ncav cuag qhov tsawg kawg nkaus tus nqi txo nrog qhov nce ntawm stirring ceev. Xav txog kev sib tov ntau lawm efficiency thiab mixing zoo, qhov pom kev sib xyaw ncej ceev omega = 48 rpm ua, nws lub sijhawm sib xyaw zoo tshaj plaws yog 35s. Los ntawm kev tsom xam ntawm kev cuam tshuam ntawm kev noj zaub mov, ib qho kev sib tov sib xyaw thiab sib tov nrawm ntawm kev sib xyaw ntawm PVA fiber ntau cement stabilized gravel, Qhov zoo tshaj plaws ib qho sib tov ntawm wdz-600 hom stabilized av tov chaw nres tsheb yog V = 615l, Qhov zoo tshaj plaws stirring kev sib hloov ceev ntawm kev sib xyaw ncej omega yog ω = 48 rpm ua, thiab lub sijhawm sib xyaw zoo tshaj plaws yog 35s. Txawm hais tias microdispersity ntawm PVA fiber ntau tseem yuav tsum tau txhim kho ntxiv nyob rau hauv cov txheej txheem sib xyaw ua ke, Nws qhov kev faib tawm yog qhov sib xws los ntawm kev pom macroscopic.
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