scholarly journals Static and dynamic compressive properties of ultra-high performance concrete (UHPC) with hybrid steel fiber reinforcements

2017 ◽  
Vol 79 ◽  
pp. 148-157 ◽  
Author(s):  
Zemei Wu ◽  
Caijun Shi ◽  
Wen He ◽  
Dehui Wang
Keyword(s):  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Compressive Properties ◽  
Ultra High Performance Concrete ◽  
Fiber Reinforcements

Study on compressive properties and chloride permeability of ultra-high-performance concrete

2021 ◽  
Vol 11 (6) ◽  
pp. 982-987
Author(s):  
Baolin Guo ◽  
Ruishuang Jiang ◽  
Baomin Wang ◽  
Shuai Liu ◽  
Yongzhi Guo
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Type A ◽  
Compressive Properties ◽  
Ultra High Performance Concrete ◽  
Chloride Permeability ◽  
Dense Microstructure ◽  
Heat Curing

In this work, two UHPC premixes were applied in investigating compressive strength and chloride permeability. Results indicated that the compressive strength of UHPC increased with content of steel fiber in standard curing. Compressive strength of type-A premix specimen with 2.0 vol% steel fiber was more than 150 MPa after heat curing. All UHPC in the experiment showed low chloride permeability under heat curing. Compared with type-B premix, the type-A premix had greater advantages in mechanical property and chloride permeability. In addition, the low porosity and dense microstructure of UHPC specimen were detected by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM), respectively. Furthermore, it was found that the introduction of fiber could refine the pore size distribution of specimen.

scholarly journals Flexural Strength Evaluation of Reinforced Concrete Members with Ultra High Performance Concrete

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Baek-Il Bae ◽  
Hyun-Ki Choi ◽  
Chang-Sik Choi
Keyword(s):  
Flexural Strength ◽  
High Performance ◽  
Strain Softening ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
High Strength ◽  
Tension Stress ◽  
Compression Stress ◽  
Ultra High Performance Concrete ◽  
Stress Block

Flexural strength evaluation models for steel fiber reinforced ultra high strength concrete were suggested and evaluated with test results. Suggested flexural strength models were composed of compression stress blocks and tension stress blocks. Rectangular stress block, triangular stress block, and real distribution shape of stress were used on compression side. Under tension, rectangular stress block distributed to whole area of tension side and partial area of tension side was used. The last model for tension side is realistic stress distribution. All these models were verified with test result which was carried out in this study. Test was conducted by four-point loading with 2,000 kN actuator for slender beam specimen. Additional verifications were carried out with previous researches on flexural strength of steel fiber reinforced concrete or ultra high strength concrete. Total of 21 test specimens were evaluated. As a result of comparison for flexural strength of section, neutral axis depth at ultimate state, models with triangular compression stress block, and strain-softening type tension stress block can be used as exact solution for ultra high performance concrete. For the conservative and convenient design of section, modified rectangular stress block model can be used with strain softening type tension stress block.

Study on Interfacial Properties of Ultra-High Performance Concrete Containing Steel Slag Powder and Fly Ash

2011 ◽  
Vol 194-196 ◽  
pp. 956-960 ◽  
Author(s):  
Yan Zhou Peng ◽  
Kai Chen ◽  
Shu Guang Hu
Keyword(s):  
Fly Ash ◽  
Bond Strength ◽  
High Performance ◽  
Steel Fiber ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Interfacial Zone ◽  
Ultra High Performance Concrete ◽  
Slag Powder ◽  
Steel Slag Powder

The interfacial properties of reactive powder concretes (RPCs), other known as ultra-high performance concrete (UHPC), containing steel slag powder and ultra fine fly ash are studied in this paper. The microstrctural characterization of interfacial transition zones (ITZs), including the aggregate-cement paste interfacial zone and the steel fiber-paste interfacial zone, is investigated by SEM. The microhardness of the aggregate-paste ITZ and the steel slag-paste ITZ is studied and the bond strength of steel fiber in matrix is tested through fiber pullout tests. The results indicate that the microhardness of the steel slag-paste ITZ is slightly higher than that of the aggregate-paste ITZ, which implies the advantage of the substitution of quartz powder with steel slag powder in preparation of RPCs to some degrees. Moreover, the hardness of these two ITZs is higher than that of the hardened paste. A certain amount of hydration products has been observed exsiting on the surface of steel fiber by SEM and the bond strength of steel fiber-martix is up to 9.3MPa. These interfical properties are definitely critical to obtain high performance of UHPCs containing steel slag powder and fly ash.

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