Ntuj marble yog lub pob zeb metamorphic tsim los ntawm thawj cov pob zeb hauv lub crust los ntawm kev kub thiab siab nyob rau hauv lub tsoo. Nws belongs rau nruab nrab pob zeb nyuaj, mas muaj li ntawm calcite, limestone, serpentine thiab dolomite. Nws lub ntsiab tivthaiv tsuas yog calcium carbonate, suav rau ntau tshaj 50%.
Lwm tus suav nrog magnesium carbonate, calcium oxide, manganese oxide thiab silicon dioxide. Vim tias marble feem ntau muaj qhov ua kom tsis zoo, thiab calcium carbonate cuam tshuam los ntawm cov pa roj carbon dioxide, carbides, thiab dej vapor hauv cov huab cua, nws tseem yooj yim weathered thiab yaig, thiab saum npoo poob sai sai nws cov lus. Yog li, ob peb ntawm cov ntau ruaj khov thiab ruaj khov ntau yam, xws li dawb marble thiab Ai Yeqing, tuaj yeem siv sab nraum zoov. Lwm yam ntxiv tsis tsim nyog rau siv sab nraum zoov, thiab feem ntau tsuas yog siv rau cov chaw kho kom zoo nkauj sab hauv. Lub ntsiab ntau yam yog: huab grey marble, zoo nkauj marble thiab li ntawm.
Lub ntsiab tseem ceeb
Cov qauv ntawm ntuj marble yog ntom tab sis tsis nyuaj, thiab nws yog qhov yooj yim rau txheej txheem, carve, du thiab polish. Tom qab polishing, cov marble yog du thiab muag heev, qhov kev ntxhib los mos yog ntuj thiab du, thiab nws muaj qib siab zoo nkauj. Marble muaj kev nqus dej tsis tshua muaj dej thiab siab ntev, thiab tuaj yeem siv rau 40-100 xyoo.
Ntuj marble muaj tus qauv zoo thiab tawv, thiab yog polished zoo li daim iav tom qab polishing. Nws cov qauv yog ntau ncab thiab zoo nkauj dua li ntawm granite. Siab lub zog muaj zog (thib ob tsuas yog rau granite), raws li cov pob zeb sib txawv, nce mus txog 300MPa, dej nqus kom tsawg, hnav tsis kam thiab tsis deformation.
Kev siv lub zog hluav taws xob: Ntxiv nrog rau qhov kev cai siab rau qhov ua kom ruaj khov thiab kev tiv thaiv ib puag ncig ntawm cov rooj tog ntawm pob zeb, cov xov hluav taws xob ntawm lub pob zeb kuj tseem tswj tau nruj. Tau ntev, cov neeg tau yuam kev xav tias cov rooj tog zaum marble yuav muaj hluav taws xob, thiab muaj qee qhov kev txhawj xeeb thaum mus yuav. Raws li qhov tseeb, ntuj marble yog tsawg heev nyob rau hauv radioactivity thiab yuav tsis ua mob rau tib neeg lub cev, thaum cov neeg uas muaj radioactivity siab yog cov rooj tog zaum marble yog.
Plaub sib cais ntawm ntuj marble:
1 Saib cov qauv: Txhua hom ntoo ntuj muaj qhov txawv ntuj thiab xim.
2 Mloog lub suab: Feem ntau hais lus, lub suab zoo pob zeb yog nkig thiab qab ntxiag.
3 Transmittance test: Ntuj marble muaj lub teeb sib kis tau zoo. Cov ntais lossis lub teeb xais siv los ua kom pom qhov nraub qaum ntawm lub pob zeb. Lub teeb xa hluav taws xob ua haujlwm siab.
4 Muaj ntau txoj hauv kev yooj yim dua los paub qhov txawv ntawm cov khoom neeg tsim thiab ntuj marble: tso ob peb ncos ntawm dilute hydrochloric acid, ntuj marble txho ua kom lub zog tuaj, thiab cov khoom lag luam zoo nkauj marble marble tsis muaj zog lossis tsis.