Kev tsim kho tshiab hauv kev tsim txiaj ntsig zoo ntawm cov npoo av tuaj yeem muab cov ntaub ntawv tseem ceeb ntawm kev tsim qauv zoo, thiab ua raws li cov qauv hybrid.
Kev tsim kho ntawm cov pob zeb ua tau tuaj yeem pom muaj xwm txheej ceev, thiab tus tswv ua niam txiv yuav tsum txheeb xyuas qhov zoo thiab ruaj khov ntawm-hauv-hauv-qhov chaw ua vaj tse. Cov xwm txheej no suav nrog kev nthuav tawm rau cov nag, tom qab daim ntawv thov ntawm cov khoom sib txuas, cov sijhawm yas hauv qab ob teev, thiab cov teeb meem uas yog kho cov teeb meem. Txawm hais tias muaj lub zog uas yuav tsum tau ua thiab lwm yam kev ntsuas khoom tau ntsib, cov kws tshuaj ntsuam yuav xav tau kev tshem tawm ntawm cov khoom hauv-situ ua raws li cov qauv tsim qauv sib txuas.
Hauv qhov no, petrography thiab lwm yam kev ua tiav (tab sis kev sim ua) tuaj yeem muab cov ntaub ntawv tseem ceeb thiab siv zog ua kom sib xyaw.
Daim duab 1. Piv txwv ntawm fluorescence microscacope micrographs ntawm qhob muab tshuaj txhuam ntawm 0.40 w / c (sab sauv kaum) thiab 0.60 w / c (sab sauv kaum). Daim duab sab laug qis qhia tau cov cuab yeej rau kev ntsuas qhov tsis kam ntawm lub tog raj kheej ua haujlwm. Tus neeg sab hauv qab sab hauv qab yog qhia qhov kev sib raug zoo ntawm cov khoom tiv thaiv tsis haum thiab w / c. Chunyu Qiao thiab DRP, lub tuam txhab twining
Anplaam txoj cai: "lub zog compressive ntawm lub pob zeb sib xyaw yog ntxig sib xws rau nws cov dej-Masen piv."
Professor Duff Abrams tau piav qhia qhov kev sib raug zoo ntawm cov dej-Mentsog hu ua Lawb koob hmoov: "lub compressive zog ntawm qhob dej / CEMENT piv." Ntxiv nrog rau kev tswj lub zog compressive, cov dej xis hmoov sib piv (w / cm) yog qhov hloov cov ntaub ntawv centyl nrog cov khoom noj khoom haus ntxiv xws li ya tshauv thiab slag. Nws tseem yog qhov tseem ceeb parameter ntawm pob zeb ruaj khov. Ntau cov kev tshawb fawb tau qhia tias pob zeb ua ke nrog w / cm qis dua ~ 0.45 yog cov chaw ua rau ib puag ncig lossis thaj chaw uas muaj cov sulfate hauv av.
Porillary pores yog ib qho kev xam pom ib feem ntawm Maas Slurry. Lawv muaj qhov chaw nruab nrab ntawm cov khoom noj muaj dej xis thiab cov khoom siv hloov kom tsis muaj tseeb. Ib txwm muaj dej. [2] Porillary Pores muaj ntau nplua tshaj li cov enrained lossis cuab ntxeem thiab yuav tsum tsis txhob tsis meej pem nrog lawv. Thaum lub capillary pores txuas nrog, kua los ntawm ib puag ncig sab nraud tuaj yeem tsiv mus ncig los ntawm cov muab tshuaj txhuam. Qhov tshwm sim no hu ua kev nkag mus thiab yuav tsum muaj peev xwm txo tau kom ntseeg tau ntev. Lub microstructure ntawm lub ruaj khov ua ke sib xyaw yog tias cov pores yog ntu ntau dua li txuas nrog. Qhov no tshwm sim thaum w / cm yog tsawg dua ~ 0.45.
Txawm hais tias nws yog qhia tsis yooj yim rau kev ntsuas w / cm ntawm tawv tawv muaj peev xwm muab tau cov cuab yeej zoo tshaj plaws rau kev tshawb nrhiav cov khoom siv tawv me me. Fluorescence me me muab kev daws teeb meem. Nov yog nws ua haujlwm li cas.
Fluorescence mectescy yog cov txheej txheem uas siv Epoxy Resin thiab Fluorescent dyes kom pom cov ntsiab lus ntawm cov ntaub ntawv. Nws yog feem ntau siv nyob rau hauv Medical Sciences, thiab nws kuj muaj cov ntawv thov tseem ceeb hauv cov ntaub ntawv txuj ci tseem ceeb. Kev thov cov txheej txheem ntawm cov qauv no hauv pob zeb pib ze li 40 xyoo dhau los hauv Denmark [3]; Nws tau ua qauv nyob rau hauv lub teb chaws Nordic nyob rau xyoo 1991 rau kwv yees rau w / c ntawm tawv tawv nplaum, thiab tau hloov kho thaum xyoo 1999 [4].
Txhawm rau ntsuas cov w / cm ntawm cov khoom siv casent-based (piv txwv li qhob ntu lossis grouting epoxy yog siv los ua cov tuab ntawm li 25 microns lossis 1/1000 nti (daim duab 2). Cov txheej txheem cuam tshuam nrog cov pob zeb ua vaj tse lossis lub tog raj kheej yog txiav mus rau hauv tiaj qhob cov thaiv (hu ua kab ntsig) nrog thaj tsam ntawm kwv yees li 25 x 50 hli (1 x 2 ntiv tes). Qhov dawb paug yog glued rau ib lub khob xaub iav, muab tso rau hauv lub nqus nqus, thiab epoxy cob qhia yog qhia nyob rau hauv lub tshuab nqus tsev. Raws li w / cm nce, qhov sib txuas thiab cov naj npawb ntawm cov hws yuav nce ntxiv, yog li ntau epoxy yuav nkag mus rau hauv cov muab tshuaj txhuam. Peb tshawb xyuas cov flakes hauv qab lub tsom iav tshwj xeeb, siv cov lim lim dej tshwj xeeb kom ua kom muaj kev lom zem rau lub ntsej muag thiab lim tawm cov paib ntau dhau. Hauv cov duab no, thaj tsam dub sawv cev rau cov khoom sib xyaw thiab cov Maas tsis muaj kev cia siab. Qhov porosity ntawm ob yog yeej 0%. Lub voj voog ntsuab yog lub porosity (tsis yog porosity), thiab lub paj ntaub yog qhov pib 100%. Ib qho ntawm cov nta no cov tshuaj ntsuab "cov khoom" yog muab tshuaj txhuam (Daim Duab 2). Raws li W / CM thiab capillary porosity ntawm cov pased xim ntxiv, cov xim ntsuab tshwj xeeb ntawm cov tshuaj txhuam ua ci ntsa iab thiab ci ntsa iab 3).
Daim duab 2. Fluorescence micrograph ntawm cov flakaph ntawm cov flakaphy ntawm cov flakes qhia cov lus sib xyaw ua ke, v) thiab muab tshuaj txhuam. Kab rov tav teb dav yog ~ 1.5 hli. Chunyu Qiao thiab DRP, lub tuam txhab twining
Daim duab 3. Fluorescence micrographs ntawm cov flakes qhia tau hais tias yog w / cm nce, ntsuab muab tshuaj txhuam maj mam ua ci dua. Cov mixtures no yog ib tug thiab muaj Fle tshauv. Chunyu Qiao thiab DRP, lub tuam txhab twining
Kev Ntsuam Xyuas Duab cuam tshuam cuam tshuam txog kev txo cov ntaub ntawv ntawm cov duab. Nws yog siv rau ntau qhov kev tshawb fawb sib txawv, los ntawm cov chaw taws teeb hnov cov tsom iav. Txhua tus pixel hauv cov duab digital yam tseem ceeb ua cov ntaub ntawv taw tes. Tus qauv no tso cai rau peb los muab cov lej rau cov qib xim ntsuab sib txawv pom hauv cov duab no. Tau 20 xyoo dhau los lossis li ntawd, nrog cov kiv puag ncig hauv lub zog thiab digital duab nrhiav tau, cov cuab yeej ntsuas duab tau dhau los ua ntau lub tshuab tsom iav) tuaj yeem siv. Peb feem ntau siv cov duab tsom xam kom ntsuas cov capillary porosity ntawm slurry. Sij hawm dhau los, peb pom tias muaj ib qho kev sib txuam zoo nruab nrab ntawm w / cm thiab cov capillary porosity, raws li muaj nyob hauv daim duab hauv qab no (Daim duab 4 thiab Daim Duab 5).
Daim duab 4. Piv txwv ntawm cov ntaub ntawv tau los ntawm cov micrographs fluorescence ntawm nyias seem. Daim duab no cov lej ntawm cov pixels ntawm ib qib muaj kev sib tw hauv ib lub photomicRograph. Peb lub siab sib raug zoo sib xyaw ua ke rau kev sib xyaw (kab laum txiv kab ntxwv), muab tshuaj txhuam (thaj chaw grey), thiab khoob (unfilled ncov ntawm txoj cai deb). Qhov nkhaus ntawm cov tshuaj ntsuab tso cai rau ib qho los suav qhov nruab nrab lub pore loj thiab nws cov qauv sib txawv. Chunyu Qiao thiab DRP, Twining tuam txhab daim duab 5. Lub graphing consted ntawm Caas, yoov tshauv, thiab ntuj pozzolan binder. Chunyu Qiao thiab DRP, lub tuam txhab twining
Hauv kev tsom xam zaum kawg, peb txoj kev kuaj ywj siab yuav tsum tau ua pov thawj los ua pov thawj tias cov qhob sab ntawm sab nraud. Raws li deb tau, tau txais cov qauv tseem ceeb los ntawm cov chaw uas ua tau raws li txhua qhov kev lees paub, nrog rau cov qauv los ntawm cov chaw muaj feem. Cov tub ntxhais los ntawm cov kev lees txais tuaj yeem siv tau los ua cov qauv tswj, thiab koj tuaj yeem siv nws ua qhov ntsuas kev ua raws li cov qauv cuam tshuam.
Hauv peb kev paub dhau los, thaum cov kws ua choj nrog cov ntaub ntawv pom cov ntaub ntawv tau los ntawm cov ntawv xeem, lawv feem ntau lees txais kev tso chaw (xws li lub zog engineering) tau ntsib. Los ntawm muab cov ntsuas ntsuas ntawm W / cm thiab tsim kom dhau qhov kev xeem uas tau hais tseg rau ntau cov haujlwm uas tau ua pov thawj hauv cov lus nug uas yuav txhais ua cov lus txhais tau zoo.
David Rothstein, Ph.D., Pg, Tag nrho yog tus thawj coj tsis pub muaj drp, ib lub tuam txhab ntxaib. Nws muaj ntau dua 25 xyoos ntawm tus kws ua tsiaj ua haujlwm thiab raug kuaj xyuas ntau dua 10,000 tus qauv los ntawm ntau dua 2,000 txoj haujlwm thoob ntiaj teb. Dr. Chunyu Qiao, Tus Thawj Fwm Tus Kws Tshaj Lij ntawm DRP, Lub tuam txhab twining, yog cov kws tshawb fawb txog kev paub ntau tshaj kaum xyoo thiab cov khoom siv ntuj thiab ua tiav cov khoom lag luam. Nws cov kws tshaj lij suav nrog kev siv cov duab tsom duab thiab fluorescence fluabital los kawm txog kev puas tsuaj, nrog cov khoom siv ua haujlwm tshwj xeeb, thiab kev siv tshuaj lom neeg hauv cov khoom siv dej kom huv.
Lub Sijhawm Post: Sep-07-2021