Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor

RESULTS OF LABORATORY TESTS<br />
A sample of crushed stone (limestone),<br />
grain size 0/31,5 mm (Figure 1), and the<br />
stone base of which the aggregate is made<br />
(Figure 2), where laboratory tests were carried<br />
out, was selected by the experts from<br />
the Mining and Metallurgy Institute Bor.<br />
Fig. 1. Prepared aggregate for testing Fig. 2. Prepared samples for testing of<br />
a stone base<br />
Mineralogical-petrologic analysis<br />
(SRPS B.B8.004)<br />
Mineralogical-petrographic analysis,<br />
macroscopic and microscopic analyses<br />
showed the following:<br />
Macroscopic description:<br />
Taken samples are of massive texture,<br />
fine-grained structure, and yellowish<br />
white color. Very small veins are filled<br />
with pure calcite.<br />
Microscopic description:<br />
Rock is of micro crystal to crypto<br />
crystal structure. It was built of calcite,<br />
which appears in the form of irregular<br />
fine-grained to coarse-grained crystals.<br />
Matrix is locally intersected by fine veins,<br />
filled with micro crystals of calcite.<br />
The results of laboratory tests of basic<br />
stone and aggregates are shown in Tables<br />
1 and 2.<br />
Table 1. Test results of basic stone<br />
TEST<br />
IN ACCORDANCE<br />
WITH<br />
RESULT<br />
In natural condition 76.79 MPa<br />
Uniaxial compressive<br />
strength<br />
In water saturated<br />
condition<br />
Compressive strength<br />
drop<br />
SRPS B.B8.012<br />
70.99 MPa<br />
7.55 %<br />
Resistance to frost (Na2SO4) SRPS B.B8.010 stable<br />
Wear resistance per Beme SRPS B.B8.015<br />
22.64<br />
cm 3 /50cm 2<br />
Wear resistance per Beme expressed by weight<br />
loss<br />
SRPS B.B8.015 8.20 %<br />
No 4, 2011. 44<br />
MINING ENGINEERING