scholarly journals Properties of Reactive Powder Concrete and Its Application in Highway Bridge

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Junwei Song ◽  
Shuhua Liu
Keyword(s):  
Compressive Stress ◽  
Strain Curve ◽  
Elastic Behaviour ◽  
Reactive Powder Concrete ◽  
Stress Strain ◽  
River Sand ◽  
Element Analysis ◽  
Conventional Concrete ◽  
Reactive Powder ◽  
Uniaxial Compressive Stress

A high-performance reactive powder concrete (RPC) was prepared with river sand, and the maximum particle size is 1.25 mm, under the 80°C steam curing condition. It is tested completely in terms of strength, uniaxial compressive stress-strain relation, flexural load-deflection relation, and frost resisting durability, and the results indicate that the concrete is suitable to RPC200. The uniaxial compressive stress-strain curve shows a linear-elastic behaviour up to explosive failure, which is different from that of conventional concrete. High postpeak load carrying capacity shows high toughness and reinforcing effect of the steel fibers. The RPC has not only much higher limit strain than conventional concrete, but also excellent frost resisting durability at the fifth day of age exceeding F300. Furthermore, the RPC satisfactorily meets the requirement of practical application for Xialouzi Bridge built with the RPC totally according to the calculation with finite element analysis software MIDAS/Civil. And the static loading testing result suggests that design of the bridge meets the utilization requirements.

Experimental Study on Compressive Property of Basalt Fiber Reactive Powder Concrete

2020 ◽  
Vol 984 ◽  
pp. 239-244
Author(s):  
Lu Liang Wang ◽  
Hai Long Zhao ◽  
De Hong Wang ◽  
Jun Feng Bai
Keyword(s):  
Test Piece ◽  
Failure Process ◽  
Basalt Fiber ◽  
Strain Curve ◽  
Reactive Powder Concrete ◽  
Compressive Property ◽  
Fiber Volume ◽  
Stress Strain ◽  
Reactive Powder ◽  
Relationship Of

In order to study the stress-strain relationship of basalt fiber reactive powder concrete (RPC), the compressive stress-strain curve test of four groups of basalt fiber RPC was carried out. The test parameters including two kinds of basalt fiber length and three fiber volume fractions showed that the deformability of the test piece was improved and the failure process was delayed after incorporating basalt fiber. The optimum fiber fraction of the test piece with 12 mm long fiber was 0.10%. According to the experimental data, the stress-strain of the basalt fiber RPC was drawn. For the curve, the constitutive relation is fitted by the piecewise equation, and compared with the experimental curve, the fitting result is better.

Influence of Uniaxial Stress on the Stress-Strain Curve Measured by Nanoindentation

2014 ◽  
Vol 597 ◽  
pp. 17-20
Author(s):  
Ikuo Ihara ◽  
Kohei Ohtsuki ◽  
Iwao Matsuya
Keyword(s):  
Compressive Stress ◽  
Strain Curve ◽  
Uniaxial Stress ◽  
Local Area ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Compressive Stresses ◽  
Multiple Loading ◽  
Tip Radius ◽  
Uniaxial Compressive Stress

A nanoindentation technique with a spherical indenter of tip radius 10 μm is applied to the evaluation of stress-strain curve at a local area of a pure iron under the uniaxial compressive stress exerted through the iron, and the influence of the compressive stress on the estimated stress-strain curve has been examined. A continuous multiple loading method is employed to determine the stress-strain curve. In the method, a set of 21 times of loading/unloading sequences with increasing terminal load are made and load-displacement curves with the different terminal loads from 0.1 mN to 100 mN are then continuously obtained and converted to a stress-strain curve. To examine the stress dependence of the stress-strain curve, the estimation by the nanoindentetion is performed under different uniaxial compressive stresses up to 250 MPa. It has been found that the stress-strain curve determined by the nanoindentation shifts upward as the compressive stress increases and the quantity of the shift is almost equal to the uniaxial stress acting on the iron specimen. It is also noted that the yield stress (0.2 % proof stress) estimated from the stress-strain curve increases almost proportionally to the uniaxial stress and the increase ratio tends to decrease as the stress reaches around 200 MPa.

Experimental Investigation on Stress-Strain Curves of Reactive Powder Concrete under Uniaxial Compression

2011 ◽  
Vol 261-263 ◽  
pp. 192-196 ◽  
Author(s):  
Yan Zhong Ju ◽  
De Hong Wang ◽  
Fei Jiang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Uniaxial Compression ◽  
Steel Fiber ◽  
Strain Curve ◽  
Fiber Content ◽  
Reactive Powder Concrete ◽  
Stress Strain ◽  
Reactive Powder

Based on experiments of uniaxial compression and flexural experiments, the basic mechanical properties (compressive strength and flexural strength) of reactive powder concrete (RPC) were investigated, the effect of the steel fiber content on mechanical properties of RPC was studied in this work. The resu1ts indicate that the axial compressive strength of RPC had no obvious change with the change of steel fiber content. When the steel fiber content varied from 1.0% to 2.0%, the flexural strength of RPC had no obvious change.When the steel fiber content varied from 2.0% to 5.0%, the flexural strength of RPC increased dramaticlly with the increase of steel fibers content. According to experiment curves, an equation for the compressive stress-strain curve of RPC was deduced with different stee1 fiber content.

Mechanical Behaviors of High Performance Recycled Aggregate Concrete

2011 ◽  
Vol 80-81 ◽  
pp. 190-194
Author(s):  
Shu Hua Liu ◽  
Zhi Yang Gao ◽  
Li Hua Li
Keyword(s):  
Compressive Stress ◽  
High Performance ◽  
Constitutive Relations ◽  
Strain Curve ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mechanical Behaviors ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Uniaxial Compressive Stress

In this testing research, a series of High Performance Recycled Aggregate Concrete (HPRAC) with recycled aggregate were prepared and their mechanical behaviors were tested, especially uniaxial compressive stress-strain behavior. The influence of the recycled aggregate replacement on mechanical behaviors of HPRAC was studied by changing replacement ratio of recycled aggregate. Testing results show that the strength of HPRAC decrease a little with the increase of the content of recycled aggregate; the uniaxial compressive stress-strain curve of HPRAC is similar to that of ordinary concrete, and the ductibility of HPRAC improve with the increase of the content of recycled aggregate; the fitted regression curves (especially numerical model) approach to measured curves and can be used in constitutive relations analysis for concrete structure.

scholarly journals Numerical Simulation of Steel-Reinforced Reactive Powder Concrete Beam Based on Bond-Slip

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4176
Author(s):  
Haoxu Li ◽  
Jiqiang Duan ◽  
Xiao Guo
Keyword(s):  
Numerical Simulation ◽  
Strain Curve ◽  
Constitutive Relationship ◽  
Reactive Powder Concrete ◽  
Damage Factor ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Bond Slip ◽  
Plastic Damage ◽  
Reactive Powder

In this study, based on the concrete damaged plasticity (CDP) model in the ABAQUS software, various plastic damage factor calculation methods were introduced to obtain CDP parameters suitable for reactive powder concrete (RPC) materials. Combined with the existing tests for the bending performance of steel-reinforced RPC beams, the CDP parameters of the RPC material were input into ABAQUS to establish a finite element model considering the bond and slip between the steel and RPC for numerical simulation. The load-deflection curve obtained by the simulation was compared with the measured curve in the experiment. The results indicated that on the basis of the experimentally measured RPC material eigenvalue parameters, combined with the appropriate RPC constitutive relationship and the calculation method of the plastic damage factor, the numerical simulation results considering the bond-slip were in good agreement with the experimental results with a deviation of less than 10%. Thus, it is recommended to select a gentle compressive stress-strain curve in the descending section, an approximate strengthening model of the tensile stress-strain curve, and to use the energy loss method and Sidoroff’s energy equivalence principle to calculate the RPC plastic damage parameters.

scholarly journals Black rubber and the non-linear elastic response of scale invariant solids

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Matteo Baggioli ◽  
Víctor Cáncer Castillo ◽  
Oriol Pujolàs
Keyword(s):  
Strain Curve ◽  
Effective Field ◽  
Elastic Response ◽  
Elastic Behaviour ◽  
Scale Invariant ◽  
Stress Strain ◽  
Nonlinear Stress ◽  
Hyper Elastic ◽  
Simple Class ◽  
Nonlinear Elastic

Abstract We discuss the nonlinear elastic response in scale invariant solids. Following previous work, we split the analysis into two basic options: according to whether scale invariance (SI) is a manifest or a spontaneously broken symmetry. In the latter case, one can employ effective field theory methods, whereas in the former we use holographic methods. We focus on a simple class of holographic models that exhibit elastic behaviour, and obtain their nonlinear stress-strain curves as well as an estimate of the elasticity bounds — the maximum possible deformation in the elastic (reversible) regime. The bounds differ substantially in the manifest or spontaneously broken SI cases, even when the same stress- strain curve is assumed in both cases. Additionally, the hyper-elastic subset of models (that allow for large deformations) is found to have stress-strain curves akin to natural rubber. The holographic instances in this category, which we dub black rubber, display richer stress- strain curves — with two different power-law regimes at different magnitudes of the strain.

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