(BASIC TEMP .28℃ , INPUT TEMP. ： 60 ℃ CEMENT ＋ 10 ℃ 3/ 8” GRAVEL ＋ 10 ℃ 3/ 4” GRAVEL ＋ 26 ℃ SAND + 25 ℃ WATER)
| |
(1)
SPECIFIC HEAT
Kcal/Kg℃ |
(2)
WEIGHT
Kg/M3 |
(3)
WATER CONTENT
Kg/M3 |
(4)
HEAT EQUIVALENT
Kcal/℃M3
(=1x2+3) |
(5)
INPUT TEMP.
℃ |
(6)
TEMP. DIFFERENCE WITH 28℃ |
(7)
HEAT DISCHARGE
Kcal/M3
(=4x6) |
|
CEMENT |
0.22 |
330 |
0 |
72.6 |
60 |
32 |
2,323 |
|
3/8” GRAVEL |
0.22 |
700 |
7 (1%) |
161 |
10 |
-18 |
-2,898 |
|
3/4” GRAVEL |
0.22 |
350 |
3.5 (1%) |
80.5 |
10 |
-18 |
-1,449 |
|
SAND |
0.22 |
780 |
62.4 (8%) |
234 |
26 |
-2 |
-468 |
|
WATER |
1 |
80 |
|
80 |
25 |
-3 |
-240 |
|
MIX HEAT |
|
|
|
|
|
|
2,586 |
|
TOTAL HEAT EQUIVALENT |
|
|
|
628.1 |
|
|
-146 |
| TOTAL HEAT DISCHARGE |
|
TEMP OF CONCRETE AFTER MIX ＝ 28℃ ＋ ΔT
ΔT ＝ TOTAL HEAT DISCHARGE ／ TOTAL HEAT EQUIVALENT ＝ -146 ／ 628.1 ＝ -0.23℃
TEMP AFTER MIX ＝ 28℃ ＋ ΔT ＝ 28 ＋ (-0.23) ＝ 27.77℃ ≦ 28℃ (BASIC TEMP)
It shows when there is a shortage of ice water and all gravel aggregate is cooled to 10 ℃ in the mixing process. The result still satisfies the basic requirement of the concrete batching plant.
