Dab tsi yog siv bluestone

Cov khoom siv ntawm bluestone slab tuaj yeem yog ntuj lossis dag. Ntuj bluestone belongs rau sedimentary pob zeb. Nws tau muab faus rau hauv av tau ntau xyoo, ua bluestone slab tov nrog lwm cov xim. Txawm li cas los xij, lub ntuj bluestone slab ua tiav los ntawm cov chaw tsim khoom yuav ua tiav cov txiaj ntsig xav tau los ntawm cov neeg siv khoom, yog li peb tsis' tsis tas yuav txhawj xeeb txog cov xim ntawm bluestone slab. Bluestone slab muaj lub zog nruab nrab, yog li nws tuaj yeem ua tiav rau hauv ntau yam duab los ntawm cov tuam ntxhab. Vim hais tias ntawm kev ua technology, qhov saum npoo yuav muab faib ua coarse wool vaj huam sib luag thiab zoo wool vaj huam sib luag. Yog li ntawd, nyob rau hauv cov nqe lus ntawm kev xaiv hauv pem teb, bluestone slab yuav muaj ntxhib anti zawv zawg nto thiab ci iav.