Kev faib tawm ntawm cov pob zeb zoo nkauj thiab tsib yam ntxwv ntawm cov pob zeb ntuj

Tam sim no, muaj plaub hom pob zeb hauv kev ua lag luam: marble, granite, terrazzo thiab pob zeb hluavtaws. Ntawm lawv, marble yog ua los ntawm dawb marble; Granite nyuaj tshaj li marble; Terrazzo yog forged los ntawm cov cement, pob zeb thiab lwm yam khoom siv raw; Synthetic pob zeb yog ua los ntawm crushed pob zeb ntawm tej yam ntuj tso pob zeb raws li raw khoom, ntxiv rau nplaum, thiab lwm yam los ntawm pressurization thiab polishing. Vim tias ob lub tom kawg yog ua manually, lawv lub zog tsis siab npaum li cov pob zeb ntuj.

Marble hais txog sedimentary lossis metamorphic carbonate pob zeb, suav nrog marble, dolomite, limestone, sandstone, shale thiab slate.

1. Hluav taws kub tsis kam

Txhua yam pob zeb txawv. Qee lub pob zeb tau siv tshuaj decomposition nyob rau hauv qhov kev txiav txim siab kub.

(1) Gypsum: decompose thaum nws siab tshaj 107c.

(2) Limestone thiab marble: decompose thaum nws siab tshaj 910c.

(3) Granite: tawg vim cua sov tsis sib xws ntawm cov ntxhia pob zeb ntawm 600C.

2. Kev nthuav dav thiab kev cog lus

Pob zeb kuj nthuav thiab shrinks nrog cua sov, tab sis yog tias nws yog rhuab thiab ces txias, nws shrinkage tsis tuaj yeem rov qab mus rau nws qhov qub ntim, tab sis yuav tsum khaws ib feem kom dhau mus tas li; Asmeskas Arsenal tau sim ntawm {{0}}C rau 1000C thiab tom qab ntawd txo mus rau 00C. Nws yog ntsuas tias qhov kev nce qib ntawm kev nthuav dav mus tas li yog 0.02-o.045 feem pua ​​.

3. Frost tsis kam

Thaum rho tawm 20 degrees Celsius, khov tshwm sim, thiab cov dej nthuav dav hauv qhov pores yog 1/10 loj dua li qhov qub ntim. Yog tias lub pob zeb tsis tuaj yeem tiv taus lub zog los ntawm qhov kev nthuav dav no, kev puas tsuaj yuav tshwm sim. Feem ntau, yog tias qhov nqus dej tsawg dua 0.5 feem pua, nws qhov kev tiv thaiv huab cua yuav tsis raug txiav txim siab.

4. Compressive zog

Lub zog compressive ntawm pob zeb sib txawv vim cov ntxhia muaj pes tsawg leeg, siv lead ua thickness, uniformity ntawm cementitious cov ntaub ntawv, load cheeb tsam, lub kaum sab xis ntawm load txiav txim thiab cleavage, thiab lwm yam. muaj zog heev. Tsis muaj qhov sib txawv ntawm lub zog compressive (qhov nqus dej tsawg heev) ntawm cov pob zeb volcanic ntom ntom tom qab ziab thiab dej saturated. Yog hais tias lawv yog cov ntxeem tau thiab dej resistant cemented pob zeb, muaj qhov sib txawv tseem ceeb ntawm lub zog qhuav thiab ntub dej.