The present study focuses on the improvement of pozzolanic reaction of fly ash particles with the cement hydration products. Low and high volume fly ash concrete mixtures were studied systematically with the addition of accelerating admixtures and accelerated curing of the concrete specimens in a steam chamber for 18 h at 75°C. Also, the reinforcing effects of glued steel fibers addition on the compressive and flexural performance of fly ash concrete were investigated. The test results indicated that the addition of accelerator improved the rate of hardening and the inclusion of steel fibers provided higher flexural performance. Also, it can be noted that the high volume fly ash (50%) addition in concrete showed a reduction in strength; however, the addition of accelerator has compensated the deceleration in strength gain. The proper selection of concrete ingredients, addition of accelerator and initial steam curing for 18 h showed better improvement on the engineering properties in fly ash concrete. A maximum increase (41.7%) in compressive strength of fly ash concrete around 52.90 MPa was noticed for 25% fly ash substitution and 1.5% steel fibers addition. Dynamic elastic modulus was also calculated in loaded concrete specimen using ultrasonic pulse velocity test and showed a good agreement with the experimental value.
Corresponding Author(s):
SIVAKUMAR Dr. Anandan,Email:sivakumara@vit.ac.in
引用本文:
. Accelerated engineering properties of high and low volume fly ash concretes reinforced with glued steel fibers[J]. Frontiers of Structural and Civil Engineering, 2013, 7(4): 429-445.
Vallarasu Manoharan SOUNTHARARAJAN, Dr. Anandan SIVAKUMAR. Accelerated engineering properties of high and low volume fly ash concretes reinforced with glued steel fibers. Front Struc Civil Eng, 2013, 7(4): 429-445.
ultrasonic pulse velocity (km/s) and rating (IS 13311 Part 1)
1 day
rating
7 days
rating
28 days
rating
56 days
rating
MC1
3.6
Good
3.75
good
4.20
good
4.50
good
MC1A
3.63
Good
3.80
good
4.10
good
4.30
good
MFC1
3.70
good
3.85
good
4.51
excellent
4.53
excellent
MFC1A
3.54
good
3.63
good
4.25
good
4.32
good
MSF1
3.48
good
3.51
good
4.28
good
4.51
excellent
MSF2
3.67
good
3.78
good
4.51
excellent
4.52
excellent
MSF3
3.73
good
3.72
good
4.29
good
4.51
excellent
MFC2
3.70
good
3.89
good
4.25
good
4.52
excellent
MFC2A
3.53
good
3.67
good
4.31
good
4.40
good
MSF7
3.58
good
3.94
good
4.31
good
4.23
good
MSF8
3.65
good
3.80
good
4.27
good
4.43
good
MSF9
3.72
good
3.90
good
4.32
good
4.51
excellent
MD1
3.60
good
3.70
good
3.90
good
4.30
good
MD1A
3.50
good
3.81
good
4.3
good
4.62
excellent
MFD1
3.61
good
3.78
good
3.97
good
4.21
good
MFD1A
3.80
good
3.91
good
4.10
good
4.20
good
MSF4
3.67
good
3.89
good
3.98
excellent
4.51
excellent
MSF5
3.50
good
3.62
good
3.78
good
4.10
good
MSF6
3.64
good
3.90
good
4.10
good
4.53
excellent
MFD2
3.55
good
3.74
good
4.52
excellent
4.13
good
MFD2A
3.60
good
3.80
good
4.51
excellent
4.51
excellent
MSF10
3.50
good
3.40
good
4.10
good
4.00
good
MSF11
3.70
good
3.90
good
4.20
good
4.20
good
MSF12
3.50
good
3.50
good
4.31
good
4.10
good
Tab.7
Fig.12
mix Id
Young's Modulus (GPa)
UPV (km/sec) and dynamic modulus of elasticity/GPa
28 days
1 days
7 days
28 days
56 days
MC1
37.26
3.60
18.66
3.75
20.25
4.24
25.89
4.50
29.16
MC1A
38.50
3.70
19.71
3.85
21.34
4.30
26.63
4.45
28.52
MFC1
36.70
3.54
18.05
3.63
18.97
4.25
26.01
4.32
26.87
MFC1A
38.12
3.48
17.44
3.51
17.74
4.28
26.38
4.21
25.52
MSF1
39.45
3.67
19.40
3.78
20.58
4.23
25.77
4.39
27.75
MSF2
41.93
3.36
16.26
3.72
19.93
4.29
26.50
4.51
29.29
MSF3
43.50
3.70
19.71
3.89
21.79
4.25
26.01
4.23
25.77
MFC2
35.40
3.61
18.77
3.85
21.34
4.10
24.21
4.20
25.40
MFC2A
35.70
3.74
20.14
3.5
17.64
3.90
21.90
4.00
23.04
MSF7
38.10
3.53
17.94
3.67
19.40
4.31
26.75
4.40
27.88
MSF8
37.78
3.58
18.46
3.94
22.35
4.3
26.63
4.12
24.44
MSF9
39.45
3.65
19.18
3.80
20.79
4.27
26.34
4.43
28.26
MD1
34.08
3.72
19.93
3.90
21.90
4.32
26.87
4.50
29.16
MD1A
36.54
3.65
19.18
3.80
20.79
4.00
23.04
4.10
24.21
MFD1
38.45
3.60
18.66
3.70
19.71
3.90
21.90
4.20
25.40
MFD1A
39.65
3.54
18.05
3.80
20.79
3.85
21.34
4.00
23.04
MSF4
40.23
3.50
17.64
3.81
20.90
4.20
25.43
4.62
30.74
MSF5
42.18
3.61
18.77
3.78
20.58
4.08
24.01
4.20
25.40
MSF6
42.97
3.80
20.79
3.91
22.01
4.10
25.32
4.21
25.52
MFD2
37.41
3.67
19.40
3.89
21.79
4.39
27.83
4.40
27.88
MFD2A
38.99
3.84
21.23
3.92
22.13
4.10
25.40
4.30
26.63
MSF10
39.43
3.50
17.64
3.62
18.87
3.78
23.45
4.10
24.21
MSF11
36.89
3.64
19.08
3.90
21.90
4.10
23.98
4.32
26.87
MSF12
37.46
3.55
18.15
3.74
20.14
3.98
23.32
4.13
24.56
Tab.8
Fig.13
Fig.14
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