Effect of Fiber Content and Fiber Length on the Dynamic Compressive Properties of Strain-Hardening Ultra-High Performance Concrete

2021 ◽  
Author(s):  
Dong Zhang ◽  
Huan Tu ◽  
Ye Li ◽  
Yiwei Weng
Keyword(s):  
Strain Hardening ◽  
Fiber Length ◽  
High Performance ◽  
High Performance Concrete ◽  
Fiber Content ◽  
Compressive Properties ◽  
Ultra High Performance Concrete

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.

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