Tensile Properties of Steel Fiber-Reinforced Reactive Powder Concrete after High Temperature

2011 ◽  
Vol 413 ◽  
pp. 270-276 ◽  
Author(s):  
Wen Zhong Zheng ◽  
Hai Yan Li ◽  
Ying Wang ◽  
Heng Yan Xie
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Steel Fiber ◽  
Heating Temperature ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Fiber Reinforced ◽  
Critical Temperatures ◽  
Reactive Powder ◽  
The Relationship

87 prismatic flexural steel fiber-reinforced reactive powder concrete (RPC) specimens with the size of 40mm×40mm×160mm were tested as well as 87 dumbbell-shaped axis tensile RPC specimens after being exposed to different high temperatures. The effect of steel fiber content and heating temperature on the flexural and tensile strength of steel fiber-reinforced RPC was analyzed. With the steel fiber content increasing, the flexural and tensile strength of steel fiber-reinforced RPC after high temperature improve significantly, and they increase first and then decrease with the heating temperature elevated, and the critical temperatures are 200¡æ and 120¡æ, respectively. Equations are established to express the relationship between the flexural and tensile strength of steel fiber-reinforced RPC and the heating temperature. The theoretical curves are in good agreement with the test data.

Creep behavior of steel fiber reinforced reactive powder concrete at high temperature

2019 ◽  
Vol 205 ◽  
pp. 321-331 ◽  
Author(s):  
Muhammad Abid ◽  
Xiaomeng Hou ◽  
Wenzhong Zheng ◽  
Raja Rizwan Hussain ◽  
Shaojun Cao ◽  
...  
Keyword(s):  
High Temperature ◽  
Creep Behavior ◽  
Steel Fiber ◽  
Reactive Powder Concrete ◽  
Fiber Reinforced ◽  
Reactive Powder

scholarly journals Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 329 ◽  
Author(s):  
Muhammad Abid ◽  
Xiaomeng Hou ◽  
Wenzhong Zheng ◽  
Raja Hussain
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
High Temperature ◽  
Reactive Powder Concrete ◽  
Peak Strain ◽  
Fiber Reinforced ◽  
Split Tensile Strength ◽  
X Ray ◽  
Reactive Powder

This study was aimed to investigate the effect of steel, polypropylene (PP), and hybrid (steel + PP) fibers on high-temperature mechanical properties of reactive powder concrete (RPC). The mechanical properties considered are cubic compressive strength, axial or prismatic compressive strength, split-tensile strength, flexural strength, elastic modulus, peak strain, and stress-strain behavior. The strength recession due to high temperature was investigated at micro level by scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction, mercury intrusion porosity, thermogravimetric, and differential scanning calorimetry analyses. The high-temperature tests were carried out at target temperatures of 120, 300, 500, 700, and 900 °C. The hot-state compressive strength of RPC started to decrease at 120 °C; however, a partial recovery at 300 °C and a gradual decrease above 300 °C were observed. The degradation of split-tensile strength, flexural strength, and elastic modulus were gradual with increasing temperature despite the effect of different fibers. Whereas, the peak strain was gradually increasing up to 700 °C. However, after 700 °C, it remained unchanged. Steel fiber reinforced RPC (SRPC) and hybrid fiber reinforced RPC (HRPC) showed a ductile behavior. PP fiber reinforced RPC (PRPC) showed a quite brittle behavior up to 300 °C; however, further heating made the microstructure porous and it became ductile too. Overall the performance of SRPC and HRPC were superior to PRPC because of higher modulus of elasticity, higher strength, and better fire resistance of steel fibers. Fiber reinforced RPC was found to have better fire resistance than traditional types of concrete based on comparative studies with the provisions of design codes and earlier research. The constitutive equations developed can be utilized in computer programs for structural design of RPC structures exposed to fire.

scholarly journals Reactive Powder Concrete Mix Ratio and Steel Fiber Content Optimization under Different Curing Conditions

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3615 ◽  
Author(s):  
Yunlong Zhang ◽  
Bin Wu ◽  
Jing Wang ◽  
Mo Liu ◽  
Xu Zhang
Keyword(s):  
Tensile Strength ◽  
Steel Fiber ◽  
Orthogonal Experiment ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Mixture Ratio ◽  
Curing Conditions ◽  
Compressive Performance ◽  
Binder Ratio ◽  
Reactive Powder

In this paper, a practical reactive powder concrete mixture ratio is created on the basis of an orthogonal experiment. Previous studies have combined the compressive and splitting tensile strengths of four categories of reactive powder concrete (RPC) for major materials. These categories include water/binder ratio, silica fume volume content, sand/binder ratio, and dosage of fly ash volume. The optimal mixing proportion of each factor was determined by analyzing the compressive strength of the RPC matrix. For this purpose, steel fiber was used as a reinforcing agent. The compressive and splitting tensile strength test results of steel fiber RPC were analyzed by comparing compound, standard, and natural curing. This was conducted to explore the improvement effect of different steel fiber contents on compressive performance, especially tensile strength of the RPC matrix. According to the results, the optimal steel fiber content was found to be 4% under the three curing conditions. The effect of compound curing on early strength was found to be greater in RPC than by natural or standard curing. However, the effect of late improvement is not obvious. Although standard curing is slightly stronger than natural curing, the performance under the latter can still meet engineering requirements.

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