Acoustic emission due to fatigue damage mechanisms in high-strength concrete with different aggregates

2019 ◽  
pp. 1491-1496
Author(s):  
T. Scheiden ◽  
N. Oneschkow ◽  
S. Löhnert ◽  
R. Patel
Keyword(s):  
Acoustic Emission ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
High Strength ◽  
Damage Mechanisms ◽  
Strength Concrete

scholarly journals STUDY ON EXPLOSIVE SPALLING PROCESS OF HIGH-STRENGTH CONCRETE BY MEANS OF ACOUSTIC EMISSION

2009 ◽  
Vol 65 (1) ◽  
pp. 16-29
Author(s):  
Mitsuo OZAWA ◽  
Shinya UCHIDA ◽  
Ruping WANG ◽  
Toshiro KAMADA ◽  
Hiroaki MORIMOTO
Keyword(s):  
Acoustic Emission ◽  
High Strength Concrete ◽  
High Strength ◽  
Explosive Spalling ◽  
Strength Concrete

scholarly journals Mode II Behavior of High-Strength Concrete under Monotonic, Cyclic and Fatigue Loading

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7675
Author(s):  
Henrik Becks ◽  
Martin Classen
Keyword(s):  
Fatigue Life ◽  
Compressive Stress ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
High Strength ◽  
Fatigue Loading ◽  
Mode Ii ◽  
Shear Tests ◽  
Strength Concrete ◽  
Mode Ii Loading

An economically efficient yet safe design of concrete structures under high-cycle fatigue loading is a rather complex task. One of the main reasons is the insufficient understanding of the fatigue damage phenomenology of concrete. A promising hypothesis states that the evolution of fatigue damage in concrete at subcritical load levels is governed by a cumulative measure of shear sliding. To evaluate this hypothesis, an experimental program was developed which systematically investigates the fatigue behavior of high-strength concrete under mode II loading using newly adapted punch through shear tests (PTST). This paper presents the results of monotonic, cyclic, and fatigue shear tests and discusses the effect of shear-compression-interaction and load level with regard to displacement and damage evolution, fracture behavior, and fatigue life. Both, monotonic shear strength and fatigue life under mode II loading strongly depend on the concurrent confinement (compressive) stress in the ligament. However, it appears that the fatigue life is more sensitive to a variation of shear stress range than to a variation of compressive stress in the ligament.

Microstructural analysis to uniaxial low cyclic compression of high-strength concrete after high temperature

2018 ◽  
Vol 22 (3) ◽  
pp. 779-791
Author(s):  
Dongfu Zhao ◽  
Penghe Jia ◽  
Pingying Hou ◽  
Huixuan Liu ◽  
Rundong Zhao ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Microstructural Analysis ◽  
High Strength ◽  
Strength Concrete ◽  
Microstructural Parameters ◽  
The Relationship

The uniaxial compressive cycling tests of high-strength concrete after high temperature under different stress were carried out using the electrohydraulic servo-controlled fatigue testing system. The investigation focused on low-cycle fatigue to figure out the relationship between microstructural development and number of cycles. The variation in microstructure during uniaxial compressive fatigue process was systematically analyzed and compared using ultrasonic, micro-hardness test, mercury intrusion porosimetry, and scanning electron microscopy. It is found that at the same life ratio, the cumulative fatigue damage caused by the lower stress is greater than that caused by the higher stress, and the four kinds of test methods used to measure the microstructure are consistent, interrelated, and confirmed with each other well. Through the nonlinear regression analysis of fatigue residual strain and microstructural parameters, the relationship models between them were established. Furthermore, the fatigue damage models based on microstructural parameters were established. On this basis, both the dynamic evolution process and damage mechanism of microstructure during uniaxial compressive fatigue were further revealed.

scholarly journals Acoustic Emission Monitoring of High-Strength Concrete Columns Subjected to Compressive Axial Loading

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3114
Author(s):  
Rami Eid ◽  
Boris Muravin ◽  
Konstantin Kovler
Keyword(s):  
Acoustic Emission ◽  
High Strength Concrete ◽  
Large Scale ◽  
Axial Loading ◽  
High Strength ◽  
Concrete Columns ◽  
Concrete Cover ◽  
Premature Failure ◽  
Strength Concrete ◽  
High Strength Concrete Columns

Acoustic Emission (AE) nondestructive tests have attracted great interest for their use in the determination of structural properties and behavior of reinforced concrete (RC) elements. One of the applications this method can contribute to is in high-strength concrete (HSC) columns. These elements have a great advantage in the lower stories of high-rise buildings. However, the premature failure of the concrete cover and the brittleness nature of the failure is of a concern for engineers. This paper presents a study on the AE monitoring of HSC columns subjected to compressive axial loading. The study consists of four large-scale reinforced HSC columns with different confinement reinforcement and height. It is shown that the AE distributions in the columns are categorized by three stages. Moreover, the levels of loads reached at the first AE macro event are similar to the lower range levels of the nominal axial compressive strengths of the tested specimens, while the majority of macro AE events are located at the concrete cover. Based on the results of this study, AE monitoring can provide indications for the damage and load levels attained by reinforced high-strength concrete columns subjected to compressive axial loading.

Experimental Study on the Fatigue Damage of High Strength Concrete under Uniaxial Compression

2014 ◽  
Vol 619 ◽  
pp. 109-115
Author(s):  
Li Hui Yin ◽  
Zong Lin Wang ◽  
Yang Liu
Keyword(s):  
Uniaxial Compression ◽  
Fatigue Damage ◽  
Fatigue Failure ◽  
High Strength Concrete ◽  
Damage Model ◽  
Correlation Coefficients ◽  
High Strength ◽  
Damage Variable ◽  
Strength Concrete ◽  
Recycle Ratio

This paper presents the results of a study on the fatigue damage of high strength concrete under uniaxial compression. Based on the experimental data, the change laws of fatigue strain and fatigue modulus are put forward. According to the experimental requests, the numerical value of fatigue strain and fatigue modulus when the fatigue failure of concrete occurs can be regarded as the criteria for fatigue failure of concrete. Then the paper presents a fatigue damage model. By reference to the concept about the damage variable defined by some scholars, the formula of the damage variable is proposed and the damage variable curves varying with recycle ratio (n%) are mapped. At last, the fitting curves of the damage variable varying with recycle ratio are proposed. The fitting effect is very good and the correlation coefficients are above 0.95.

scholarly journals Research on the Fatigue Properties of High Strength Concrete after Exposure to High Temperature under Low Cyclic Compressive Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Linhao Wang ◽  
Haijing Gao ◽  
Haibiao Gao ◽  
Zhili Luo
Keyword(s):  
High Temperature ◽  
Fatigue Damage ◽  
High Strength Concrete ◽  
Testing Machine ◽  
Compressive Loading ◽  
High Strength ◽  
Repeated Loading ◽  
Regression Equations ◽  
Strength Concrete ◽  
High Temperature Process

By using an electrohydraulic servo fatigue testing machine, fatigue tests were performed on C60 high strength concrete (HSC) under low cyclic compressive loading after undergoing normal temperature, 200°C, 400°C, 600°C, and 800°C. Failure patterns of high strength concrete under low cyclic compressive loading were observed. The influence of the high temperature process on the static elastic modulus of high strength concrete was analyzed. By studying the development law of fatigue strain, regression equations of fatigue strain after different high temperatures were established. Furthermore, the fatigue deformation modulus ratio was defined as the damage variable and the relationship models between the high temperature process and the fatigue damage were established. It provides the experimental foundation for fatigue damage analysis of high strength concrete in objective working conditions, which includes repeated loading and different high temperature processes.

Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash

2012 ◽  
Vol 2 (3) ◽  
pp. 102-104 ◽  
Author(s):  
Suthar Sunil B ◽  
◽  
Dr. (Smt.) B. K. Shah Dr. (Smt.) B. K. Shah
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Strength Development ◽  
Strength Concrete
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