Txij thaum ub los, cov limestone tau siv los ntawm tib neeg los tsim kho. Nyob rau tib lub sijhawm, cov pob zeb sedimentary no txawv heev hauv nws cov softness ntawm granite thiab lwm hom pob zeb. Txiv qaub crushed pob zeb yog tsim los ntawm tej yam ntuj tso khoom, uas feem ntau yog calcium carbonate (calcite).
Cov ntaub ntawv dav dav txog cov khoom siv hauv tsev
Limestone yog mined nyob rau hauv central Russia yuav luag txhua qhov chaw, vim hais tias nws yog heev dav, yooj yim rau txheej txheem thiab muaj zoo heev tshuaj thiab lub cev zog. Yog li ntawd nws yog siv nyob rau hauv kev tsim kho kom dav, thib ob tsuas yog cov xuab zeb thiab gravel cov ntaub ntawv. Limestone gravel tuaj yeem yog cov xim sib txawv. Nws cov xim nyob ntawm ntau yam inclusions thiab impurities. Feem ntau, cov khoom no muaj xim dawb, xim av lossis grey tint. Hauv qee thaj chaw nws yog hu ua dolomite rubble. Nws qhov ntom ntom yog 2, 2-2, 7. Txiv qaub crushed pob zeb yog tau los ntawm crushing ib tug natural ntxhia. Tom qab ntawd nws dhau los ntawm kev kho tshuaj tshwj xeeb. Ntawm lwm hom rubble, qhov nopheej yig.
txiv qaub crushed pob zeb: daim ntawv thov nyob rau hauv lub teb chaws kev khwv nyiaj txiag
Vim cov khoom siv no yog pob zeb tsis muaj zog, cov khoom kawg tau los ntawm nws kuj muaj lub zog qis. Feem ntau crushed limestone yog siv rau txoj kev ua hauj lwm. Nyob rau tib lub sijhawm, tsis txhob hnov qab tias nws yooj yim heev ntxuav tawm, uas ua rau txo lub neej ntawm txoj kev nto. Yog vim li ntawd lawv thiaj tsuas yog nchuav rau ntawm txoj kev uas muaj tsheb thauj me me xwb.
Tsis ntev los no, cov khoom siv hauv tsev no tau siv ntau ntxiv rau kev tsim ntau yam ntawm cov pob zeb thiab cov khoom siv ntxiv dag zog. Feem ntau nws kuj yog siv rau kev kho kom zoo nkauj. Txij li thaum crushed limestone muaj ib tug tsis tshua muaj hluav taws xob keeb kwm yav dhau, muaj coob tus neeg nyiam muab nws nrog lwm hom crushed pob zeb thiab pob zeb. Qhov kev sib xyaw ntawm cov khoom siv hauv tsev no yog qhov zoo rau kev npaj cov yards thiab kev tsav tsheb. Nws yog qhov nrov tshaj plaws nrog cov tswv ntawm cov av me me. Vim nws cov khoom siv kho tshuab thiab tus nqi qis, nws tuaj yeem txo tus nqi ntawm kev ua haujlwm tiav.
Lub pob zeb crushed no tseem tuaj yeem siv rau kev tsim cov txiv qaub, dej qab zib, calcium carbide, ntxhia chiv, fluxes rau steel ntau lawm. Nws yog siv los ua tus muab tub lim hauv ntau yam kev lag luam sib xyaw, hauv kev luam ntawv thiab iav kev lag luam. Nws yog siv los tsim cov flux los ua Portland cement.
Tus nqi ntawm cov khoom siv hauv tsev
Qhov zoo ntawm qhov noCov khoom siv hauv tsev tau tsim los ntawm GOST. Crushed txiv qaub qib 400 feem 40x70 nqi 401 rubles / tuj. Yog hais tias peb tham txog qhov kev xaiv 20x40, ces nws tus nqi yog 436 rubles / t; thiab 5x20 - 531 rubles / t (VAT suav nrog). Feem ntau ntawm cov tuam txhab tsim cov khoom siv hauv tsev no tsim qib 600 txiv qaub crushed pob zeb. Yog li, nyob rau hauv Moscow (MKAD) crushed pob zeb 40x70, 20x40 nqi 850 rubles / cubic meter, thiab me me 5x20 - 870 rubles / cubic meter. (VAT suav nrog). Qhov zoo ntawm cov khoom siv hauv tsev no yuav tsum ua raws li cov cai ntawm GOST8267-93.
