REVISTA ROMÂNĂ DE AUTOMATICĂ - IPA SA

4
REVISTA ROMÂNĂ DE AUTOMATICĂ
Fig. 5 Automated burning system of the
aggregate dryer
The burning system has a continuous
functioning at the parameters designed to
ensure the quantity of heat, temperature and
possibilities for automatic adjustment to the
requirements of the process of heating the
flow of natural aggregate necessary in the
preparation in the pilot CEMA 15.
The equipment for automation ensures the
function / stop of the burner in all situations
caused by lack of fuel, voltage, combustion air,
accidentally extinction of the flame, repeated
stops; is working in accordance with a diagram
of automation envisaged in design and ensures
the safe functioning of the combustion system
within designed parameters.
The dryer’s productivity is higher than that
required by the pilot stationl designed
productivity. The dryer can provide necessary
aggregate flow dried and heated to an initial
moisture of 6 .... 7%.
For quality determination of hot-mix produced
in CEMA 15 pilot station, has been preleved
and tested 8 probes in 8 batchs (table 2) of
BA16 asphalt concrete:
- asphalt content;
- granulometric composition;
- mixture aparent density;
- water absorbtion;
- Marshall stability and creep.
Characteristics values of hot-mix BA 16 batchs
Table 2
Characteristics
Limits
SR Hot-Mix
174/1 - Formula
2002
Batch
1
Batch
2
Batch
3
Batch
4
Batch
5
Batch
6
Batch
7
Batch
8
Bitume,% ± 0,30 5,50 5,33 5,69 5,43 5,35 5,37 5,48 5,45 5,51
Aggregate,% - 94,50 94,67 94,31 94,57 94,65 94,63 94,52 94,55 94,49
ρ a ,Kg/m 3 ≥
2.479 2.382 2.477 2.404 2.383 2.387 2.450 2.421 2.470
2.300
A vol , % 2 ... 5 1,458 4,958 1,078 3,574 4,361 4,764 2,306 3,084 1,631
Ø 25 100 100,00 100,00 100,00 100,00 100,00 100,00 100,00 100,00 100,00
Ø 16 83...96 96,10 95,87 90,86 93,97 96,05 95,35 95,07 94,86 93,78
Ø 10 66...85 69,52 74,12 73,02 72,88 74,01 73,73 73,10 72,94 74,07
Ø 8 58...78 58,63 63,51 62,97 62,77 63,00 61,98 62,71 63,31 65,64
# 4 42...66 45,91 46,78 44,13 43,92 43,78 44,21 45,32 46,03 45,12
# 2 30...55 34,35 31,85 34,36 32,84 33,09 32,97 34,18 32,86 35,83
# 1 22...42 27,02 23,24 26,54 24,95 24,81 25,26 26,44 25,17 26,71
# 0,63 18...35 24,04 21,76 26,01 24,86 21,08 22,11 22,93 21,98 23,15
# 0,2 11...25 14,45 13,59 16,65 15,03 14,79 15,30 16,07 15,16 15,98
# 0,1 9...13 9,33 9,34 11,03 10,31 9,88 10,33 10,45 10,08 11,17
# 0,071 - 7,59 7,13 9,00 8,37 7,29 7,54 8,82 7,64 8,86
S, kN ≥ 7,5 8,0 9,8 9,6 10,2 9,3 8,7 10,9 9,1 8,9
I, mm
S/I, kN
1,5 ...
4,0
1,8 ...
5,0
3,90 2,55 3,11 3,13 2,87 2,53 3,40 2,93 2,77
2,051 3,843 3,087 3,259 3,240 3,439 3,206 3,106 3,213