Page 63 - Riem-Vol6_nº2
Basic HTML Version
234
IBRACON Structures and Materials Journal • 2013 • vol. 6 • nº 2
Influence of the environment and loading age on SCC drying creep
mixtures, varying the type of cement, type and proportion of
aggregates and additions, in order to verify whether the predic-
tive models are suitable or not for this type of concrete.
5. Acknowledgements
The authors would like to thanks FAPESP (Fundação de Amparo à
Pesquisa de São Paulo) for the financial support and Engemix for
affording the materials used in this paper.
6. References
[01] Husni, R.; Benítez, A.; Manzelli, A.; Macchi, C.;
Charreau, G.; Risetto, J.; Luco, L. F.; Guittelman, N.;
Morris, W. Ações sobre as estruturas de concreto.
In: HELENE, P. Manual de reparo, proteção e reforço
de estruturas de concreto. Red Rehabilitar, 2005. 1,
p.37-104.
[02] Mehta, P. K.; Monteiro, P. J. M. Concreto – estrutura,
propriedades e materiais. PINI, São Paulo, 2008.
[03] Equipe de FURNAS, Laboratório de concreto,
Departamento de apoio e controle técnico, Concretos:
massa, estrutural, projetado e compactado com rolo.
Editor: Walton Pacelli de Andrade, PINI, São Paulo, 1997.
[04] Neville, A. M. Propriedades do concreto. São Paulo,
PINI, 828p., 1997.
[05] Neville, A. M.; Dilger, W. H., Brooks, J. J. Creep of
plain concrete. London, New York, Construction
Press, Estados Unidos, 361p., 1983.
[06] Neville, A. M. Creep of concrete: plain, reinforced, and
Table 6 – Prediction models input data
Input data
ACI
Ec2
B3
GL
NBR
Type of cement
f (Mpa)
cm28
f (Mpa)
ck
Relative humidity
t (age at loading in days)
0
t (age at cure end in days)
c
t (end o test in days)
f
Notional size(h )
0
Ratio V/S (mm)
Applied load (Mpa)
Temperature (°C)
E (Mpa)
cm28
Slump (mm)
3
Water content (kg/m )
3
Cement content (kg/m )
Air content (%)
Fine aggregate percentage (%)
3
Total aggregate (kg/m )
3
Unit weight of concrete (kg/m )
Type of cure
ASTM I
57.4
-
60%
14/49
-
365
-
37.5
15
-
33800
50/280
-
-
2
51,8
-
2300
moist
N
-
49.4
60%
14/49
-
365
75 mm
-
15
23
33800
-
-
-
-
-
-
-
-
ASTM I
57.4
-
0.6
14/49
14/49
365
-
37.5
15
-
33800
-
180
370
-
-
1800
-
-
ASTM I
57.4
-
0.6
14/49
14/49
365
-
37.5
15
-
33800
-
-
-
-
-
-
-
-
CP II
-
49.4
60%
14/49
-
365
0.075m
-
15
23
33800
50/280
-
-
-
-
-
-
-
Table 7 – Coefficient of variation between experimental results and the prediction models
Model
14D-inside
B3
chamber
14D-outside
B3
chamber
49D-inside
B3
chamber
49D-outside
B3
chamber
all
ACI-50
28
12
33
16
24
ACI-280
5
16
14
10
12
B3
12
6
30
14
18
EC2
23
8
32
16
22
GL
7
28
8
20
18
NBR-50
6
24
24
8
18
NBR-280
17
38
19
9
23
