Fatigue deformation behavior and fiber failure mechanism of ultra-high toughness cementitious composites in compression

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.

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Quasi-static and dynamic compressive behavior of ultra-high toughness cementitious composites in dry and wet conditions

Construction and Building Materials ◽

10.1016/j.conbuildmat.2019.117008 ◽

2019 ◽

Vol 227 ◽

pp. 117008 ◽

Cited By ~ 1

Author(s):

Xin Zhao ◽

Hedong Li ◽

Cheng Wang

Keyword(s):

Cementitious Composites ◽

Compressive Behavior ◽

High Toughness ◽

Dry And Wet Conditions

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Contribution of steel fiber on the dynamic tensile properties of hybrid fiber ultra high toughness cementitious composites using Brazilian test

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.118416 ◽

2020 ◽

Vol 246 ◽

pp. 118416 ◽

Cited By ~ 1

Author(s):

Xin Zhao ◽

Qinghua Li ◽

Shilang Xu

Keyword(s):

Tensile Properties ◽

Steel Fiber ◽

Brazilian Test ◽

Cementitious Composites ◽

Hybrid Fiber ◽

High Toughness ◽

Dynamic Tensile Properties

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Study on the Preparation of Green and Environmentally Friendly High Toughness Cementitous Composites with Large Amount of Fly Ash

Materials Science Forum ◽

10.4028/www.scientific.net/msf.996.97 ◽

2020 ◽

Vol 996 ◽

pp. 97-103

Author(s):

Xiang Rong Cai ◽

Bai Quan Fu ◽

Zhi Gang Liu

Keyword(s):

Fly Ash ◽

Flexural Strength ◽

Strain Hardening ◽

Cementitious Composites ◽

Special Focus ◽

Type I ◽

Flexural Performance ◽

High Toughness ◽

Four Point Bending ◽

Pva Fiber

In order to reduce the environmental burden and the energy consumption of PVA fiber reinforced high toughness cementitious composites, special focus is placed on the influence of fly ash type and content and curing type on the flexural performance of high toughness cementitious composites through four-point bending tests. The high toughness cementitious composites without fly ash have been used in the program for comparison purpose. The tests results show that, compared with the basic high toughness cementitious composites, the flexural strength decreases and the deflection increases with the s/b increasing when the fly ash is added. The increase in fly ash content results in an improvement of strain hardening property and increases in both flexural strength and deflection, which show that fly ash is benefit to the pseudo strain hardening performance. However the effects of fly ash type and curing type are not obvious on the load but obvious on the deflection. The deflection of high toughness cementitious composites with type I fly ash or water curing is higher than that of type II or standard curing. It is demonstrated that all the high toughness cementitious composites studied in this paper exhibit strain-hardening and multiple cracking through adding fly ash.

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The Apparent Density, Tensile Properties and Drying Shrinkage of Ultra High Toughness Cementitious Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.261-263.223 ◽

2011 ◽

Vol 261-263 ◽

pp. 223-227 ◽

Cited By ~ 6

Author(s):

Xiang Rong Cai ◽

Bai Quan Fu ◽

Shi Lang Xu

Keyword(s):

Strain Hardening ◽

Apparent Density ◽

High Performance ◽

Drying Shrinkage ◽

Uniaxial Tensile ◽

Cementitious Composites ◽

Fiber Reinforced ◽

High Toughness ◽

High Performance Fiber ◽

Pseudo Strain Hardening

A new class of high performance fiber reinforced cementitious composites called Ultra High Toughness Cementitious Composites (UHTCC) is developed in the last few years. It is a pseudo strain hardening material with maximum tensile strain capacity more than 3%, yet the fiber volume fraction no more than 2%. The multiple cracking patterns accompanying pseudo strain hardening behavior are obtained which implies high ductility, energy absorption capacity, and toughness. A remarkable characteristic distinguish it from conventional high performance fiber reinforced concrete is the maximum crack width of multiple cracks which is about 60µm under ultimate tensile load. Such micro-cracks are often small enough to prevent the intrusion of aggressive agents. From a durability point of view this composite can be considered as an effectively uncracked material. The performances of this new material, including the apparent density, the uniaxial tensile property, and the drying shrinkage performance, are experimental studied in this paper.

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