2024 Tus sau: Howard Calhoun | [email protected]. Kawg hloov kho: 2023-12-17 10:28
Kev faib tawm ntawm cov pob zeb ua tiav raws li peb lub ntsiab lus: los ntawm lub hom phiaj, los ntawm qhov nruab nrab ntom ntom, thiab los ntawm hom kev sib khi hauv qhov sib tov. Raws li nws lub hom phiaj, cov khoom no tau muab faib ua ntau subclasses. Piv txwv li, nyob rau hauv ib co tej yam kev mob, yuav tsum tau muaj zog tiv thaiv tshav kub, nyob rau hauv lwm yam - tej yam kev mob, thiab lwm yam. Nyob rau hauv txhua rooj plaub, qhov zoo tshaj plaws muaj pes tsawg leeg yog xaiv uas yuav tsis tso cai rau cov qauv mus vau thaum lub sij hawm ua hauj lwm.
Feem ntau, kev faib tawm hauv qab no ntawm cov pob zeb ua tau raws li nws lub hom phiaj:
- cov khoom siv tshwj xeeb (siv nyob rau hauv cov xwm txheej ntawm cov hluav taws xob siab, hauv qhov chaw acidic, thiab lwm yam);
- sib tov rau kev taug kev, txoj kev, tshav dav hlau;
- pob zeb zoo tib yam (cov hauv paus, qab nthab, ntau yam kev ua vaj tse pob zeb yog tsim los ntawm nws);
- hydraulic engineering qauv (siv hauv kev tsim cov kav dej, pas dej, kwj dej, thiab lwm yam).
Kev faib cov pob zeb los ntawm qhov ntom ntom yog nyob ntawm seb cov khoom sib sau loj npaum li cas tau nkag mus rau hauv qhov muaj pes tsawg leeg. Yog tias qhov sib tov muaj pumice, tuff thiab lwm yam ntxeem tau, ces nws tuaj yeem hnyav ntawm 0.5 mus rau 1.8 tons ib.cubic meter (lub teeb yuag, nrog rau cov pob zeb slag, pumice pob zeb, nthuav av nplaum pob zeb). Txhawm rau kom tau txais cov qauv hnyav tshwj xeeb (ntau tshaj 2.5 tons / cubic meter), cov ntaub ntawv steel tau nkag mus rau hauv cov pob zeb. Xws li kev sib xyaw yog siv los tsim cov qauv kev tiv thaiv. Cov pob zeb hnyav (1.8-2.5 tons / cubic meter) yog tsim los ntawm diabase, granite lossis limestone.
Kev faib tawm ntawm cov pob zeb tseem tseem ceeb cov khoom sib xyaw ua ke, xws li cov pob zeb aerated, ua npuas ncauj lossis ua npuas ncauj silicate. Lawv qhov hnyav ntawm ib lub cubic meter yog tsawg dua li ib nrab tons. Vim qhov nce cellularity, cov pob zeb ntawm cov chav kawm no muaj cov thermal conductivity tsawg, tab sis tib lub sijhawm tsis muaj zog. Yog li ntawd, lawv feem ntau yog siv los ua cov khoom muag.
Kev faib cov pob zeb los ntawm hom binders yog ntau dua. Cov khoom tsis tshua muaj niaj hnub no yog silicates nrog txoj kev kho autoclave. Tsis tas li ntawd tsis tshua muaj kev sib xyaw ua ke raws li cov iav ua kua, iav-alkali Cheebtsam uas xav tau los tsim cov pob zeb kub-resistant.
Cov ntaub ntawv ntau tshaj plaws yog raws li gypsum, uas yog siv los ua cov khoom tiav, cov khoom siv sab hauv, nrog rau cov khoom sib tov rau cov txheej txheem dej tsis zoo. Tsis tas li ntawd, muaj cov cement pob zeb siv dav (xws li Portland MAAs), slag-alkali (ib yam khoom tshiab ntawm kev tsim ua lag luam), polymer cement compositions.
Kev faib tawm thiab cov khoom ntawm cov pob zeb tsim nyog txhawm rau txiav txim siab lub ntsiab lus ntawm qhov sib xyaw thiab yav tom ntejtsim. Nyob rau hauv particular, rau xws li compositions, xws li cov yam ntxwv xws li kev mus los (muaj peev xwm kis tau nyob rau hauv nws tus kheej qhov hnyav), dej tsis kam (ntawm lub siab npaum li cas ntawm 0.15 meters tsis cia dej los ntawm) thiab, uas yog ib qho tseem ceeb heev rau Russia, Frost tsis kam., yog txawv. Piv txwv li, pob zeb cim F1000 tuaj yeem tiv taus ib txhiab thaw-thaw cycles, uas yog qhov tseem ceeb tshwj xeeb tshaj yog nyob rau hauv cheeb tsam nrog huab cua tsis ruaj khov, thaum tus qauv F50 tuaj yeem tiv taus tsuas yog 50 lub voj voog.
Pom zoo:
Sau-tawm ntawm cov khaub ncaws ua haujlwm thaum tso tawm ntawm tus neeg ua haujlwm: lub tswv yim ntawm cov khaub ncaws ua haujlwm, kev ua haujlwm, kev txiav txim ntawm Ministry of Finance thiab kev tshaj tawm
Kev tshem tawm cov khaub ncaws ua haujlwm thaum tus neeg ua haujlwm raug tshem tawm yog tias nws tsis tuaj yeem siv cov cuab yeej tiv thaiv rau lwm tus kws tshaj lij lossis tus neeg ua haujlwm qub tsis kam rov qab cov khoom. Rau qhov no, tus accountant ntawm lub tuam txhab siv cov ntawv tshaj tawm tiag tiag, uas tso cai rau koj los kho qhov sau-tawm hauv accounting
Kev faib tawm ntawm kev tsim khoom thiab kev siv pov tseg. Kev faib cov khoom pov tseg los ntawm chav kawm phom sij
Tsis muaj kev faib tawm dav dav ntawm kev noj thiab cov khoom pov tseg. Yog li ntawd, kom yooj yim, cov hauv paus ntsiab lus ntawm kev sib cais yog feem ntau siv, uas yuav tau tham hauv tsab xov xwm no
Qhov ntom ntawm cov pob zeb crushed - gravel, granite, limestone thiab slag. Qhov ntom ntom ntawm cov pob zeb crushed: coefficient, GOST thiab txhais
Crushed pob zeb yog cov khoom uas tsis muaj dej, tsis muaj dej thiab granular tau los ntawm kev sib tsoo. Nws muab faib ua thawj thiab theem nrab. Qhov no yog qhov tseeb tseem ceeb. Thawj - qhov tshwm sim ntawm kev ua cov pob zeb ntuj: pebbles, pob zeb, pumice thiab lwm yam ntaub ntawv. Secondary yog tau los ntawm crushing siv pov tseg, xws li pob zeb, asph alt, cib. Nyob rau hauv cov ntawv no, peb yuav txiav txim siab nyob rau hauv ntau yam zoo xws li cov cuab yeej raws li qhov ceev ntawm crushed pob zeb
Kev txiav txim siab ntawm kev ua vaj tse: txoj hauv kev, khoom siv, GOST. Kev tswj thiab kev ntsuam xyuas ntawm cov pob zeb ua kom muaj zog
Thaum kuaj xyuas cov qauv hauv tsev, kev txiav txim siab ntawm lub zog ntawm cov pob zeb ua tiav los txiav txim siab lawv lub xeev nyob rau lub sijhawm tam sim no. Kev ua tau zoo tiag tiag tom qab pib ua haujlwm feem ntau tsis phim cov qauv tsim
Pob zeb sib xyaw: cov khoom, muaj pes tsawg leeg, hom, qib ntawm pob zeb, yam ntxwv, ua raws li GOST cov qauv thiab daim ntawv thov
Ntawm cov khoom tseem ceeb ntawm cov pob zeb sib tov, uas tseem hu ua hydrotechnical pob zeb, nws yog ib qho tsim nyog los qhia txog qhov ua kom muaj dej ntau ntxiv. Cov vaj tse raug tsim los ntawm cov khoom siv no los siv rau hauv thaj chaw swampy lossis hauv cheeb tsam uas muaj dej nyab
