Dab tsi yog qhov cuam tshuam ntawm silica fume rau cov khoom siv ntawm cov pob zeb?
Aug 13, 2024Tso lus
1, Txhim kho kev ua haujlwm ntawm daim ntawv cog lus
Vim tias cov ntshav hauv cov pob zeb yuav ua rau qee cov dej dawb tuaj yeem sib sau ua ke hauv qab steel bar thiab sib sau ua ke, yog li txo qhov kev sib raug zoo ntawm cov cement slurry thiab kev sib txuas ntawm steel bar thiab aggregate, qhov sib ntxiv ntawm silica fume tuaj yeem txo cov ntshav hauv lub cev. cov pob zeb tshiab, yog li txo cov tsub zuj zuj ntawm cov dej sib txuas thiab txhim kho qhov kev sib raug zoo ntawm kev sib raug zoo.
2, Ua kom lub zog compressive
Vim yog qhov sib ntxiv ntawm silica fume, qhov kev hloov pauv ntawm cov cement slurry thiab aggregate tau txhim kho, thiab cov qauv pore tau ua kom zoo dua qub thiab muaj zog ntxiv. Tab sis qee qhov kev siv dej ntau ntxiv yog offset los ntawm kev siv dej ntau ntxiv. Tom qab qhov sib ntxiv ntawm silica fume, lub zog ntawm cov pob zeb tuaj yeem ntsuas tau los ntawm kev ntsuas kev ua haujlwm. Lub npe hu ua efficiency Performance index yog hais txog tias thaum cov cement hloov los ntawm silica fume, qhov kev koom tes ntawm silica fume rau lub zog ntawm cov pob zeb yuav sib npaug li 2 mus rau 5 npaug ntawm lub zog uas cov cement tuaj yeem tsim tau, thiab ntau qhov no hu ua efficiency Performance index. ntawm silica fume. Nrog rau qhov nce ntawm qhov ntau npaum ntawm wollastonite, qhov Performance index maj mam txo. Thaum cov koob tshuaj ntawm wollastonite ntau dua 20%, qhov Performance index txo qis. Thaum cov tshuaj ntau tshaj 30%, lub zog ntawm pob zeb txawm txo. Yog li, qhov ntau npaum li cas yuav tsum tsis txhob ntau tshaj 20%. Thaum cov ntsiab lus silica fume siab dhau lawm, cov pob zeb sib xyaw tshiab yuav ua kom khov thiab ua rau muaj kev nyuaj ntawm kev tsim kho thiab ramming. Nyob rau tib lub sijhawm, tus nqi ntawm silica fume yog siab dua li ntawm cov cement, thiab nyob rau hauv qhov chaw ntawm kev ua tau raws li lub zog los yog lwm yam kev ua tau zoo ntawm cov pob zeb tsim, nws tsim nyog los sib tov tsawg dua. Hauv kev ua haujlwm siab, cov ntsiab lus siv feem ntau yog nruab nrab ntawm 5% thiab 15%.
3, Tensile thiab dabtsi yog khoov zog
Lub tensile compression piv ntawm cov pob zeb dav dav yog ntau dua li ntawm qhuav curing, tab sis lub tensile compression piv ntawm silica fume qhob yog zoo ib yam li nws yog qhuav curing los yog ntub curing.
4. Elastic modulus
Lub elastic modulus ntawm wollastonite qhob nce nrog qhov nce ntawm silica fume cov ntsiab lus thiab qhov txo qis ntawm dej-binder piv. Vim qhov txo qis ntawm porosity nyob rau hauv qhov chaw hloov pauv ntawm cov khoom sib xyaw thiab cov cement slurry, tag nrho cov tawv nqaij ntawm wollastonite pob zeb nce.
5. Ntsig
Creep, zoo li shrinkage, muaj feem xyuam rau kev tsiv teb tsaws ntawm cov dej dawb los ntawm cov pob zeb tawv tawv vim ziab los yog dej, thiab feem ntau txo qis thaum lub zog compressive nce.
6. Qhuav shrinkage
Hauv cov pob zeb muaj zog, yuav luag tag nrho cov dej dawb yog siv rau hydration, thiab qhuav shrinkage thiab autogenous shrinkage nce nrog qhov txo qis ntawm dej-cement piv, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm kev sib xyaw silica fume. Yog tias silica fume ntxiv, evaporation ntawm capillary pore thinning dej txo. Yog li ntawd, lub qhuav shrinkage ntawm wollastonite pob zeb nce nyob rau hauv thaum ntxov theem thiab txo nyob rau hauv lub tom ntej theem.
Txhawm rau txo qis qis qis thaum ntxov ntawm cov pob zeb silica fume, nws tuaj yeem siv los txuas ntxiv lub sijhawm ntub dej, sib tov silica fume rau hauv slurry lossis ntxiv qhov tsim nyog nthuav dav.
