13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Specimen 1 Specimen 2 Specimen 3 Specimen 4 Figure 9. Random aggregate model with 300mm×300mm×300mm The uniaxial tensile stress -strain curve of recycled concrete is getting as shown in Figure 10. The tensile strengths of the four specimens were 2.29Mpa, 2.30MPa, 2.31MPa and 2.28MPa. The uniaxial tensile strength average of the specimen group is 2.30MPa. Figure 10. Stress-strain curve of RAC with 300mm×300mm×300mm The size effects of mechanics properties of RAC under uniaxial tension loading are shown in table 2. Table 2. Different sizes of recycled concrete compressive strength under uniaxial tension loading Different sizes of recycled concrete Tensile strength/MPa 100mm×100mm×100mm 2.67 150mm×150mm×150mm 2.51 300mm×300mm×300mm 2.30 7. Conclusions (1) In this paper, a model of the base force element method (BFEM) is proposed for the damage analysis problem and is used to simulate the relations of meso-structure and macro-strength of recycled aggregate concrete (RAC). The characteristics of the BFEM are that the expression of the stiffness matrix IJ K is a precise expression, and it is not necessary to introduce the Interpolation function and the Gauss’ integral for calculating the stiffness coefficient at a point. The numerical results show that this method can be used for damage analysis of the RAC. Stress σ/MPa Strainε/10 -6 0 0.5 1 1.5 2 2.5 0 20 40 60 80 100 120 Specimen 1 Specimen 2 Specimen 4 Specimen 3
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