Preparation and Basic Mechanical Properties of Self-Compacting Concrete

2010 ◽  
Vol 150-151 ◽  
pp. 354-357
Author(s):  
Heng Yan Xie ◽  
Xin Zheng
Keyword(s):  
Strain Curve ◽  
Self Compacting Concrete ◽  
Stress Strain ◽  
Mixture Ratio ◽  
Concrete Members ◽  
Compression Strain ◽  
Stress Strain Relation ◽  
Steel Bar ◽  
Flexural Member ◽  
Good Flow

Self- compacting concrete (SCC) has characteristics of good flow-ability, non-vibrating and self-compacting. It is the optimum to be used in concrete members with densely distributed steel bar and concrete is inconvenient to be vibrated. The mixture ratio of design grade of C20 and C40 SCC commonly used in project is given after trial mix. The compression stress-strain relation of SCC prism is obtained by MTS. The Mechanical property indexes of SCC are got. The ultimate compression strain of the extreme fiber is acquired by testing beam made of SCC, and the relation between the ultimate compression strain of the extreme fiber in flexural member and the strain at the peak of the stress-strain curve subjected to uniaxial compression is given.

Behavior and modeling of post-heated circular concrete specimens repaired with fiber-reinforced polymer composites

2021 ◽  
pp. 136943322110585
Author(s):  
Seyed Mehrdad Elhamnike ◽  
Rasoul Abbaszadeh ◽  
Vahid Razavinasab ◽  
Hadi Ziaadiny
Keyword(s):  
Strain Curve ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Concrete Members ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Exposure of buildings to fire is one of the unexpected events during the life of the structure. The heat from the fire can reduce the strength of structural members, and these damaged members need to be strengthened. Repair and strengthening of concrete members by fiber-reinforced polymer (FRP) composites has been one of the most popular methods in recent years and can be used in fire-damaged concrete members. In this paper, in order to provide further data and information about the behavior of post-heated circular concrete columns confined with FRP composites, 30 cylindrical concrete specimens were prepared and subjected under four exposure temperatures of 300, 500, 700, and 900. Then, specimens were repaired by carbon fiber reinforced polymer composites and tested under axial compression. Results indicate that heating causes the color change, cracks, and weight loss of concrete. Also, with the increase of heating temperature, the shape of stress–strain curve of FRP-retrofitted specimens will change. Therefore, the main parts of the stress–strain curve such as ultimate stress and strain and the elastic modulus will change. Thus, a new stress–strain model is proposed for post-heated circular concrete columns confined by FRP composites. Results indicate that the proposed model is in a good agreement with the experimental data.

Dynamic Stress-Strain Relations for Annealed 2S Aluminum Under Compression Impact

1953 ◽  
Vol 20 (4) ◽  
pp. 523-529
Author(s):  
J. E. Johnson ◽  
D. S. Wood ◽  
D. S. Clark
Keyword(s):  
Dynamic Stress ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Impact Stress ◽  
Stress Strain Relation ◽  
Final Strain ◽  
Dynamic Relations ◽  
Single Stress ◽  
The Impact

Abstract This paper presents the results of an experimental study of the stress-strain relation of annealed 2S aluminum when subjected to compression impact. Two methods of securing a dynamic stress-strain curve are considered, namely, from the measurement of impact stress as a function of maximum plastic strain, and impact stress as a function of the impact velocity. The dynamic stress-strain curves obtained by these methods lie considerably above the static curve. The elevation in stress of the dynamic relations above the static relation increases progressively from zero at the elastic limit to about 20 per cent at a strain of 4.5 per cent. However, the two dynamic relations are not coincident which indicates that the behavior of the material cannot be described by a single stress-strain curve for all impact velocities. A family of stress-strain curves which differ slightly from each other and which depend upon the final strain is postulated in order to correlate both sets of data adequately.

Analysis of Plastic Deformation in a Steel Cylinder Striking a Rigid Target

1954 ◽  
Vol 21 (1) ◽  
pp. 63-70
Author(s):  
E. H. Lee ◽  
S. J. Tupper
Keyword(s):  
Compression Test ◽  
Dynamic Compression ◽  
Strain Curve ◽  
High Strength ◽  
Stress Strain ◽  
Steel Cylinder ◽  
Theoretical Approaches ◽  
Stress Strain Relation ◽  
Strength Alloy ◽  
Dynamic Yield

Abstract The G. I. Taylor dynamic compression test consists of firing a cylinder of the material to be tested at a target of hardened armor plate, and deducing the dynamic yield stress from the resulting deformation. In the interpretation of the results, interest is concentrated on the wave front of initial plastic straining. The present paper attempts the theoretical determination of the entire strain distribution in such a test cylinder of nickel-chrome steel, this material being chosen since the dynamic influence on the stress-strain relation is likely to be small, thus permitting the static relation to be used in the theory. Strain distributions deduced by two theoretical approaches compare satisfactorily with the distribution of strain obtained in such a dynamic compression test, thus justifying the assumption for this material at the speed considered. The treatment of this problem requires a theory of the propagation of plastic waves, which is developed in this paper, for the particular type of stress-strain curve pertaining to the high-strength alloy steel tested.

A Novel Method to Predict the Mechanical Properties of DP600

2019 ◽  
Vol 795 ◽  
pp. 22-28
Author(s):  
Yun Qiang Peng ◽  
Li Xun Cai ◽  
Di Yao ◽  
Hui Chen ◽  
Guang Zhao Han
Keyword(s):  
Dual Phase Steel ◽  
Fracture Criterion ◽  
Strain Curve ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Small Punch ◽  
Critical Fracture ◽  
Stress Strain Relation ◽  
Novel Method ◽  
Related Stress

A small punch testing (SPT)-related stress-strain relation (SPT-SR) model is used to obtain the stress-strain curve of DP600 according to Chen-Cai equivalent energy method. And then the SPT and notched small punch testing (NSPT) specimens were simulated in order to determine the critical fracture criterion of DP600 on the basis of the stress-strain curve obtained by SPT-SR model. Lastly, the J resistance curve of small C-shaped inside edge-notched tension (CIET) specimen for DP600 dual-phase steel was successfully predicted based on the aforementioned fracture criterion.

scholarly journals Study Numerical Simulation of Stress-Strain Behavior of Reinforced Concrete Bar in Soil using Theoretical Models

2019 ◽  
Vol 5 (11) ◽  
pp. 2349-2358
Author(s):  
Ali Sabah Al Amli ◽  
Nadhir Al-Ansari ◽  
Jan Laue
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Three Dimensional ◽  
Theoretical Models ◽  
Element Model ◽  
Stress Strain ◽  
Strain Behavior ◽  
Concrete Members ◽  
Steel Bar ◽  
Three Dimensional Finite Element

Nonlinear analysis for reinforced concrete members (R.C.) with two types of bars also with unsaturated and saturated soils was used to represent the models. To control the corrosion in the steel bar that used in R.C. member and decrease the cost, the geogrid with steel bar reinforcement are taken in this study to determine the effect of load-deflection and stress-strain relationships. The finite element method is used to model the R.C. member, bars and soil. A three-dimensional finite element model by ABAQUS version 6.9 software program is used to predict the load versus deflection and stress versus strain response with soil. The results for the model in this study are compared with the experimental results from other research, and the results are very good. Therefore, it was concluded that the models developed in this study can accurately capture the behavior and predict the load-carrying capacity of such R.C. members with soil and the maximum stresses with strains. The results show plastic strain values in the R.C. member with saturated soil are larger than their values in unsaturated soil about (54%, 58%, and 55% and 52%) when the geogrid ratios are (without geogrid, 60%, 40% and 20%) respectively, with the same values of stresses.

An Invariant-Based Flow Rule for Anisotropic Plasticity Applied to Composite Materials

1991 ◽  
Vol 58 (4) ◽  
pp. 881-888 ◽  
Author(s):  
Andrew C. Hansen ◽  
Donald M. Blackketter ◽  
David E. Walrath
Keyword(s):  
Composite Materials ◽  
Effective Stress ◽  
Traditional Approach ◽  
Strain Curve ◽  
Unidirectional Composite ◽  
Flow Rule ◽  
Anisotropic Plasticity ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation

In this paper we discuss some fundamental problems associated with incremental anisotropic plasticity theories when applied to unidirectional composite materials. In particular, we question the validity of an effective stress-strain relation for highly anisotropic materials of this nature. An effective stress-strain relation is conventionally used to determine a flow rule for plastic strain increments. It is our view that such a relation generally does not exist for many high-performance unidirectional composites. To alleviate the problem associated with defining an effective stress-strain curve we develop an anisotropic plasticity theory in which the flow rule does not requires such a relation. The proposed theory relies on developing an accurate expression for a scalar hardening parameter g(σ). The general form of g(σ) is substantially reduced by invoking invariance requirements based on material symmetry. The general invariant-based theory developed herein is specialized to case of transverse isotropy and applied to the analysis of a nonlinear elastic-plastic unidirectional composite material. The invariant-based theory is shown to produce superior results over the traditional approach for a series of uniaxial and biaxial load cases predicted using finite element micromechanics.

Experimental Research on Self-Compacting Concrete with Different Mixture Ratio of Fly Ash

2011 ◽  
Vol 236-238 ◽  
pp. 490-495 ◽  
Author(s):  
Zhong Jian Sun ◽  
Wei Wei Duan ◽  
Mei Ling Tian ◽  
Yan Feng Fang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Work Performance ◽  
Strain Curve ◽  
Self Compacting Concrete ◽  
Split Tensile Strength ◽  
Mixture Ratio ◽  
Rate Of Spread ◽  
Result Show ◽  
Axial Compressive Strength

Study the affection of work performance and mechanical properties with different contents of fly in the self-compacting concrete. The mixture content of fly ash is respectively 16%, 20%, 30% and 40%. Carry on the experiment of slump, rate of spread, cube compressive strength, cube split tensile strength, prism axial compressive strength as well as the elasticity modulus of self-compacting concrete. Simultaneously obtain the corresponding stress-strain curve, and make the data fitting to it. The experiment and the analysis result show that there is a reasonable rang of mixture content of fly ash. When mixture proportion was suitable, the work performance of self-compacting concrete can be effectively improved, but the strength is also influenced. The early strength reduces much. This experiment provides the theoretical basis for reasonable application of fly ash in practical projects.

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