274
9 Dynamic Responses of Reinforced UHPCC Members Under …
9.2 Test Program
9.2.1 Specimen Fabrication
Total eleven reinforcement UHPCC specimens and two reinforcement NSC specimens with the identical reinforcement arrangement were fabricated, the specimen
dimensions and the symmetric reinforcing details are illustrated in Fig. 9.1. The
concrete cover thickness was 30 mm. The longitudinal and transverse reinforcement
were deformed bars with 22 mm diameter and plain round bars with 6 mm diameter,
respectively. The corresponding elastic modulus, yield strength and ultimate strength
of reinforcing bars were derived according to the Chinese Standard GB/T 228.1-2010
(2010), as listed in Table 9.1.
The conventional concrete was used in NSC specimens, whose compressive
strength and elastic modulus were 30.4 MPa and 30 GPa according to the Chinese
Standard GB/T 50081-2002 (2003). The UHPCC specimens were cast with the material developed by Jiangsu SOBUTE new material Co., Ltd., the mixture proportions
of UHPCC are given in Table 9.2, and the detailed properties of the mixed cementitious materials can be found in our previous work (Wu et al. 2015). Especially,
the micro-straight steel fiber was incorporated with the volume fraction of 2.0%
and the corresponding material properties are given in Table 9.3. The corresponding
compressive strength, elastic modulus and Poisson’s ratio of UHPCC were 148 MPa,
48.6 GPa and 0.23, respectively.
Fig. 9.1 Specimens configuration (unit mm)
Table 9.1 Material properties of reinforcing steel bar
Reinforcement
Diameter (mm) Elastic modulus
(GPa)
Yield strength
(MPa)
Ultimate strength
(MPa)
Longitudinal bar 22
180
368.0
456.6
Transverse bar
6
200
420.9
530.0
Table 9.2 Mixture proportions of UHPCC (kg/m 3 )
Cement
Silica fume
Ultra-fine mineral
admixture
Sand
Water
HRWR
Fiber content
700
140
110
1200
152
22.8
156
9 Dynamic Responses of Reinforced UHPCC Members Under …
9.2 Test Program
9.2.1 Specimen Fabrication
Total eleven reinforcement UHPCC specimens and two reinforcement NSC specimens with the identical reinforcement arrangement were fabricated, the specimen
dimensions and the symmetric reinforcing details are illustrated in Fig. 9.1. The
concrete cover thickness was 30 mm. The longitudinal and transverse reinforcement
were deformed bars with 22 mm diameter and plain round bars with 6 mm diameter,
respectively. The corresponding elastic modulus, yield strength and ultimate strength
of reinforcing bars were derived according to the Chinese Standard GB/T 228.1-2010
(2010), as listed in Table 9.1.
The conventional concrete was used in NSC specimens, whose compressive
strength and elastic modulus were 30.4 MPa and 30 GPa according to the Chinese
Standard GB/T 50081-2002 (2003). The UHPCC specimens were cast with the material developed by Jiangsu SOBUTE new material Co., Ltd., the mixture proportions
of UHPCC are given in Table 9.2, and the detailed properties of the mixed cementitious materials can be found in our previous work (Wu et al. 2015). Especially,
the micro-straight steel fiber was incorporated with the volume fraction of 2.0%
and the corresponding material properties are given in Table 9.3. The corresponding
compressive strength, elastic modulus and Poisson’s ratio of UHPCC were 148 MPa,
48.6 GPa and 0.23, respectively.
Fig. 9.1 Specimens configuration (unit mm)
Table 9.1 Material properties of reinforcing steel bar
Reinforcement
Diameter (mm) Elastic modulus
(GPa)
Yield strength
(MPa)
Ultimate strength
(MPa)
Longitudinal bar 22
180
368.0
456.6
Transverse bar
6
200
420.9
530.0
Table 9.2 Mixture proportions of UHPCC (kg/m 3 )
Cement
Silica fume
Ultra-fine mineral
admixture
Sand
Water
HRWR
Fiber content
700
140
110
1200
152
22.8
156