Which of the following rocks has greater compressive strength Granite - Limestone, Schist and Why ?

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Mirko O Stankovic

Poštovani gospodine Jaffar, granit, od navedenih stena, ima najbolja fizičko mehanička svojstva pa tako i čvrstoću na pritisak. Zbog strukture i teksture granita - opšte građe te stene, daju mu ta geomehaničko- fizička svojstva. Granit je inače dubinska magmatska stena, granularne i fanaritne strukture. Inače ima veliku specifičnu težinu.

Pošto je čvrst je čvrs i otporan materijal često se koristi u građevinarstvu... Vrlo mnogo se koristi kao podloga u gradskim ulicama, ivičnjacima...

Inače, krečnjak je bolji od škriljaca upravo zbog same građe- minerali, nastanak... Krečnjak je sedimantna stena dok su škriljci mogu biti metamorfne ali sedimentne stene. Škriljac, crne boje je sedimentna stena, ima ga raznim bojama. Često se upotrebljava u građevinarstvu za fasade, obloge itd.

Sundus F Hantoosh

Dear Doctor

Go To

Influence of some rock strength properties on jaw crusher performance in granite quarry

By BM OLALEYE

Elsevier, Mining Science and Technology (China)

Volume 20, Issue 2, March 2010, Pages 204-208

"Abstract

The influence of rock strength properties on Jaw Crusher performance was carried out to determine the effect of rock strength on crushing time and grain size distribution of the rocks. Investigation was conducted on four different rock samples namely marble, dolomite, limestone and granite which were representatively selected from fragmented lumps in quarries. Unconfined compressive strength and Point load tests were carried out on each rock sample as well as crushing time and size analysis. The results of the strength parameters of each sample were correlated with the crushing time and the grain size distribution of the rock types. The results of the strength tests show that granite has the highest mean value of 101.67 MPa for Unconfined Compressive Strength (UCS) test, 6.43 MPa for Point Load test while dolomite has the least mean value of 30.56 MPa for UCS test and 0.95 MPa for Point Load test. According to the International Society for Rock Mechanic (ISRM) standard, the granite rock sample may be classified as having very high strength and dolomite rock sample, low strength. Also, the granite rock has the highest crushing time (21.0 s) and dolomite rock has the least value (5.0 s). Based on the results of the investigation, it was found out that there is a great influence of strength properties on crushing time of rock types."