Mechanical properties of sea sand recycled aggregate concrete under axial compression

Huang, Yijie; He, Xujia; Wang, Qing; Sun, Yuedong

doi:10.1016/j.conbuildmat.2018.04.136

Cited by 59 publications

(32 citation statements)

References 23 publications

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“…According to Wang et al, Xiao et al, and Belén et al, it has been described that the shape of the stress‐strain relationship of RAC is similar to that of NAC. As shown in Figure A, the numerical relative stress‐strain relationships are in good agreement with experimental results …”

Section: Resultssupporting

confidence: 79%

“…As shown in Figure 11A, the numerical relative stress-strain relationships are in good agreement with experimental results. 49,102 Figure 11B shows the influence of the recycled aggregates percentages on the stress-strain curves. This can obviously be divided into three branches: the ascending part (linear and nonlinear), the softening part and the descending part.…”

Section: Stress-strain Curvesmentioning

confidence: 99%

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Base force element method based on the complementary energy principle for the damage analysis of recycled aggregate concrete

Wang

Peng

Kamel

et al. 2019

Numerical Meth Engineering

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Summary The finite element method (FEM) is an effective approach for exploring the failure mechanism of heterogeneous materials. According to the complementary energy principle, the use of FEM might suffer from several difficulties in terms of keeping the elements and their boundaries balanced, as well as finding interpolation functions. In this study, we introduced an efficient approach to researching the failure mechanism of the material, named base force element method (BFEM), according to complementary energy principle. Specifically, the element compliance matrix of an arbitrary quadrilateral element with four mid‐edge nodes was expressed based on the complementary energy principle. Then, the node displacement was obtained by the governing equation using the Lagrange multiplier method. In addition, both the compliance matrix and the node displacement were represented as explicit expressions without the use of Gaussian integration. A numerical model of the recycled aggregate concrete (RAC) was established according to the Monte Carlo method. A comparative sample of the digital image model was also established using digital image technology. The influences of substituting recycled aggregate and the relative mechanical properties of adhered mortar to those of new mortar on the failure mechanism of RAC were studied. The simulation results indicated that the BFEM is an effective approach to researching the damage mechanism of heterogeneous materials.

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Section: Resultssupporting

confidence: 79%

Section: Stress-strain Curvesmentioning

confidence: 99%

Base force element method based on the complementary energy principle for the damage analysis of recycled aggregate concrete

Wang

Peng

Kamel

et al. 2019

Numerical Meth Engineering

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“…Xiao et al studied the effects of replacement ratio of recycled aggregate (0, 30, 50, 70, and 100%) on compressive strength and the stress–strain curve of RAC. Huang et al investigated the influences of the sea sand chloride ions content and the replacement ratio of recycled aggregate on each of the compressive strength, stress–strain relation, and failure pattern of sea sand RAC. However, Fan et al presented an experimental study on the shrinkage and creep behavior of RAC with four replacement ratios of recycled aggregate (0, 33, 66, and 100%).…”

Section: Introductionmentioning

confidence: 99%

Mesomechanical properties of concrete with different shapes and replacement ratios of recycled aggregate based on base force element method

Wang

Peng

Kamel

2019

Structural Concrete

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In order to study the mesomechanical properties of recycled aggregate concrete (RAC) under uniaxial tension, a numerical model of RAC with two different aggregate shapes (circular and convex) and five different replacement ratios of recycled aggregate (0, 30, 50, 70, and 100%) was established. A new finite element method-base force element method (BFEM) was used to derive the element strain and the element stiffness matrix with an explicit expression without Gauss integral. The two-dimensional numerical model of the RAC was simulated to study the effect of aggregate shape, replacement ratio of recycled aggregate, aggregate distribution and interfacial transition zone (ITZ) properties on mesomechanical properties of RAC. Simulation results demonstrated that once the first crack appeared, the peak stress and peak strain were reached. The first crack appeared in old ITZ, which was located in whether the upper part or the lower part of the large-size recycled aggregate. The continuous cracks were mainly around the recycled aggregate and the aggregate concentrated area. Comparing with natural concrete, when the replacement ratio of recycled aggregate was 100%, the elastic modulus decreased by 16~25%, the peak stress decreased by 12~15%, and the peak strain changed slightly. The ITZ had a significant influence on the mechanical properties of RAC and must be considered in the analysis.

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“…Figure 10, the stress-strain curve of steel can be divided into ve stages: elasticity, elastoplasticity, plasticity, hardening, and secondary plastic ow [43,44]. e expression of the stress-strain curve is as follows [45]: Test data in this study Ma et al [33] Huang et al [35] Thomas et al [7] Xiao et al [38] Ahmadi et al [34] Deng et al [36] Beltran et al [37] Yang and Han [17] Fitting curve γ Figure 9: Relationship between β c and c.…”

Section: Nonlinear Finite Element Analysismentioning

confidence: 99%

Stiffness Analysis of Recycled Self‐Compacting Concrete‐Filled Circular Steel Tubular Columns under Eccentric Compression

Fang

et al. 2019

Advances in Civil Engineering

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In this study, twenty-one recycled self-compacting concrete-filled circular steel tubular (RSCFCST) columns are designed and tested under eccentric compression. The studied parameters including the replacement ratio of the recycled coarse aggregate (RCA), strength grade of concrete, eccentricity, and length-diameter ratio L/D of specimens are considered. The load-stiffness curves of the specimens are obtained by observing the whole process of loading, and the effects of various parameters on the stiffness of the specimens are analyzed. Test results demonstrate that the RSCFCST short columns L/D≤4 under eccentric compression exhibit drum-like bending failures, while the RSCFCST long columns L/D>4 under eccentric compression experience the global flexural buckling failure modes. With the replacement ratio of RCA, the length-diameter ratio or eccentricity increases, and the bearing capacity of specimens under eccentric compression decreases. However, the increase in the strength grade of concrete increases the bearing capacity. The stiffness of the RSCFCST columns under eccentric compression gradually increases as the strength grade of concrete increases, while the eccentricity had an adverse effect on stiffness of specimen. With the increase of load, the increase of the length-diameter ratio would accelerate the stiffness degradation of specimen. The effect of the replacement ratio of RCA on stiffness of specimen in the elastic stage is not obvious. A validated FE model is employed to conduct parametric studies to widen the available test results. Additionally, an analytical model for predicting the effective stiffness of the RSCFCST columns under eccentric compression is proposed based on the moment magnifier method, and verification of this method is performed using the test data and FE analysis.

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Mechanical properties of sea sand recycled aggregate concrete under axial compression

Cited by 59 publications

References 23 publications

Base force element method based on the complementary energy principle for the damage analysis of recycled aggregate concrete

Base force element method based on the complementary energy principle for the damage analysis of recycled aggregate concrete

Mesomechanical properties of concrete with different shapes and replacement ratios of recycled aggregate based on base force element method

Stiffness Analysis of Recycled Self‐Compacting Concrete‐Filled Circular Steel Tubular Columns under Eccentric Compression

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