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

This anchor mixture will be used in the<br />
“T“ore body. The applied concrete was<br />
PC 42.5N and complete prepared injection<br />
mixture for anchors, ROFIX 995.<br />
Compressive strength test was carried<br />
out on a concrete after 7 days of maturing,<br />
as it was requested by Polimerinžekt Ltd.<br />
Testing was carried out according to the<br />
Standard SRPS U.M2.008: 1994. The results<br />
are shown in Table 1.<br />
Table 1 Test results<br />
Sample designation<br />
Sample dimensions<br />
d x h [mm]<br />
Failure<br />
force<br />
P [kN]<br />
Uniaxial<br />
compressive<br />
strength<br />
σp [MPa]<br />
Bulk<br />
density<br />
[kg/m 3 ]<br />
Rate of longitudinal<br />
waves<br />
VL [m/s]<br />
1. 151.0 36.09 1940.0 3440,0<br />
2. 7.3x7.5 147.0 35.14 1913.0 3424,0<br />
3.<br />
131.0 31.32 1936.0 3318,0<br />
Mean values: 143.0 34.18 1929.67 3394.0<br />
CONCLUSION<br />
Fresh concrete mass shows the certain<br />
characteristics which affect the other<br />
phases of production process. Two questions<br />
are often asked:<br />
1. Which properties of concrete are<br />
important from the standpoint of rational<br />
use the technological equipment?<br />
2. Which of these characteristics is the<br />
most important for quality assurance of<br />
harden mass?<br />
It could be said that the most important<br />
characteristics of concrete are:<br />
- homogeneity<br />
- workability,<br />
- segregation,<br />
- binding time,<br />
- temperature,<br />
- compressive strength.<br />
According to the obtained results, it<br />
could be said that tested anchor mixture<br />
satisfies the criteria for use in the “T“ ore<br />
body.<br />
REFERENCES<br />
[1] Report on Mechanical Properties of<br />
Injection Mass, Anchor Mixture and<br />
Concrete Flow that will be Used in the<br />
”T“ Ore Body – Level 95 of the Bor Pit,<br />
Bor, February 2011 (in Serbian)<br />
[2] M. Ljubojev, R. Popović, M. Bugarin,<br />
Deformation Pressure, Support Rigidity<br />
and Rock Massif Characteristics of a<br />
Route the Krivelj River Tunnel, Mining<br />
Engineering 2/2008, 123-128, Bor,<br />
2008 (in Serbian)<br />
No 4, 2011. 35<br />
MINING ENGINEERING