Experimental Study on Flexural Fatigue Property of Ultra-High Toughness Cementitious Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1369-1378 ◽  
Author(s):  
Shi Lang Xu ◽  
Wen Liu
Keyword(s):  
Experimental Study ◽  
Fatigue Loading ◽  
Fiber Reinforced Concrete ◽  
Cementitious Composites ◽  
Multiple Cracks ◽  
Steel Fiber Reinforced Concrete ◽  
Flexural Fatigue ◽  
Fatigue Stress ◽  
High Toughness ◽  
Stress Levels

This paper presents an experimental study on the flexural fatigue characteristics of Ultra-High Toughness Cementitious Composites (UHTCC), in contrast with plain concrete and Steel Fiber Reinforced Concrete (SFRC) which have similar compressive strength. The results show that UHTCC improves fatigue life and exhibits a bi-linear fatigue stress-life relationship. The deflection ability, failure characteristics of UHTCC were investigated in the tests. It was observed that, similar to static loading situation, multiple cracks were formed under fatigue loading, while the number of cracks decreased with the degradation of stress levels. For this reason, the deformability is much weaker at lower fatigue stress levels than that at higher stress levels. Moreover, the failure section is divided into three different districts, and the proportion of fiber rupture to fiber pullout is different under different stress levels.

scholarly journals Experimental Study of Pool Effect of Shear, Flexure and Torsion on SFRC Beams

2020 ◽  
Vol 9 (6) ◽  
pp. 233-236
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Aspect Ratio ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Concrete ◽  
Combined Effect ◽  
Bending Stress ◽  
Steel Fiber Reinforced Concrete ◽  
Specific Fraction

Flexural, torsional, compressive and shear behavior of Steel Fiber Reinforced Concrete (SFRC) is already studied individually but none has studied the performance of SFRC beams under a combined effect of more than one state i.e. tension, flexure, torsion, compression and shear in general by now. In this study M20 grade of concrete beams under composite behavior of flexure, shear and torsion with different compositions of fibers mix were investigated. The dimensions of specimen beams was 100 mm x 100 mm x 500 mm and straight cylindrical fibers of length 0.28 mm and aspect ratio 100 were mixed. A total of 48 specimen were casted and tested such that for every percentage of fiber and each torsion value three beams were tested. Hence there are four torsion values 0, 61.75, 119.41 and 176.53 N-m are applied (4x3x4=48) It was found during study that ultimate bending stress and deflection increases due to increase in torsion where as the ductility reduced with the torsion enhancement for a specific fraction of fiber content.

Experimental Study on the Flexural Fatigue Damage Evolution of Layered Fiber Reinforced Concrete

2008 ◽  
Vol 385-387 ◽  
pp. 673-676
Author(s):  
Ji Wang ◽  
Ming Zhong Zhang ◽  
Xiao Chun Fan
Keyword(s):  
Reinforced Concrete ◽  
Fatigue Life ◽  
Damage Evolution ◽  
Steel Fiber ◽  
Fatigue Tests ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Flexural Fatigue ◽  
Order Of Magnitude

In order to study the damage evolution law for layered fiber reinforced concrete subjected to flexural fatigue, the flexural fatigue tests were carried out on both layered steel fiber reinforced concrete(LSFRC) and layered hybrid fiber reinforced concrete(LHFRC) beams of which the type of steel fiber was uniform on the same concrete mix. At the same time the flexural fatigue tests with original concrete(OC) were carried out. Based on the experiments, both flexural fatigue life and damage characteristic of LSFRC LHFRC and OC were compared and analyzed. The results indicated that the fatigue life of LHFRC was a little larger than that of LSFRC under the stress level, which was more than an order of magnitude of OC. And the fatigue distortion of LSFRC, LHFRC and OC were similar. They all followed three-phase law. However, the proportion of every phase was different, which proved that layered steel fibers and polypropylene fibers could effectively restrain the degradation of concrete.

Experimental Study on Flexural Toughness of Steel-Polypropylene Fiber Reinforced Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 156-160 ◽  
Author(s):  
Zhi Gang Ren ◽  
Peng Tao Hu ◽  
You Zou
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Crack Resistance ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Flexural Toughness ◽  
Macro Scale ◽  
Polypropylene Fiber Reinforced Concrete

The Steel-polypropylene fiber reinforced concrete take full advantage of steel fiber’s macro-scale crack resistance function on the concrete as well as the polypropylene fiber’s micro-scale crack resistance and toughening effect on the concrete matrix. In this paper, the three kinds of concrete specimens including plain high-strength concrete, steel fiber reinforced concrete and steel-polypropylene fiber concrete are selected for a flexural toughness experimental study, their compressive strength and deformation performance are analyzed, and their toughness index are investigated with ASTM-C1018 and PCS(post-crack strength) method. The results show that steel-polypropylene fiber reinforced concrete has better strength and toughness property as well as deformation performance.

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