2. 2

7. 1.
2.
3.

8. (dB)
Hz)
dB
:

9. “ ”
1
, (W/C ratio) 0.5,
0.6, 0.7 0.8 5, 7.5, 10
( ),
(NRC)
(TL)
36
0.4-0.7
0.03-0.09
0.2
Putzmeister
concentric spraygun

10. :2550
50 . . X 50
. . 1 . .
( )
5:1 ( : )
1.

11. 2.
cm
3.
4.
1.
2.
3.
4.
5.
6.
––
2.
PVC

12. (dB)
Hz)
dB
1. PVC 45
2. ( Hz )
3.
4. –
2.
PVC
(dB)
Hz),
dB cm ( )

13. 1.
PVC 45
2. ( Hz )
3.
4. –

14. 2.
PVC
(dB)
Hz)
dB :1 ( )
1.
PVC 45
2. ( Hz )
3.
4. –

15. (dB) (dB) (dB) (dB)
109.7 109.5 109.6 109.6 4.93 %
111.2 111.1 111.1 111.1 %
112.8 113.1 113.0 1.77 %
dB %

16. : (dB) (dB) (dB) (dB)
: 1 110.4 110.5 110.4 %
1 : 1 109.7 109.5 109.6 4.93 %
1.4 : 1 109.1 108.9 109.0 5.50 %
: 1
dB
%
cm
(dB) (dB) (dB) (dB)
0.5 110.2 110.1 110.4 %
1 109.7 109.5 109.6 4.93 %
1.5 108.9 109.0 108.8 5.60 %
dB
%

17. 5

18. :
1
:1
http://www.slideshare.net/chinppk05/ex2-24334514
http://www.slideshare.net/chinppk05/ex3-24334531