Abstract
An experimental study was carried out on the uniaxial compression, uniaxial splitting, pure shear, and compression size effect of rubber concrete with 5 different substitution rates by applying hydraulic servo and direct shear apparatus. Then, by comparing the failure modes and ultimate strength eigenvalues of rubber concrete under different loading conditions, the following conclusions were drawn: with the increase of rubber substitution rate, the concrete specimens maintain a relatively good integrity under uniaxial compressive failure; on the contrary, the failure sections under uniaxial slitting and pure shear gradually become uneven with an increasing amount of fallen rubber particles. With the increase of specimen size, the integrity of rubber concrete after failure is gradually improved. Affected by an increased rubber substitution rate, the uniaxial compressive strength, splitting tensile strength, and shear strength of the concrete gradually decrease, while the plastic deformation capacity gradually increases. Specifically, the compressive strength is reduced by a maximum of 60.67%; the shear strength is reduced by a maximum of 49.85%; and the uniaxial splitting strength is reduced by a maximum of 58.38%. Then, we analyzed the strength relationship and the underlying mechanism among the three types of loading modes. It is found that, at the same rubber substitution rate, the compressive strength of rubber concrete gradually increases as the specimen size decreases, and the size effect on the compressive strength gradually decreases as the rubber substitution rate increases. Meanwhile, we performed qualitative and quantitative analysis on the equation describing the coupling effect of specimen size and rubber substitution rate on the compressive strength; the results suggest that the proposed equation is of a high level of applicability. Our research has a reference value for the application and promotion of rubber concrete in actual engineering projects.
Highlights
Rubber concrete refers to a new type of concrete that is formed by quantitatively substituting a part of fine aggregate or coarse aggregate with rubber particles. is new concrete is featured with high impact resistance, high crack resistance, and good toughness, for which it has drawn a wide concern from both domestic and foreign scholars
In accordance with our experimental data related to the compressive strength of rubber concrete with different substitution rates, the expression for the size effect law of rubber concrete as shown in Figure 15(a) and the mathematical regression parameter values of the size effect law for rubber concrete specimens with different substitution rates as shown in Table 4 were obtained by performing mathematical regression analysis per (5)
En, by deriving and comparing the failure modes and strength eigenvalues of rubber concrete specimens under different loading conditions, the following conclusions were drawn: (1) e underlying mechanisms for the uniaxial compression, uniaxial splitting, and pure shear failure of rubber concrete with different substitution rates are basically the same and independent of the rubber substitution rate. e difference lies in that, with the increase of rubber substitution rate, the concrete specimens maintain a relatively good integrity under uniaxial compressive failure, while the failure sections under uniaxial slitting and pure shear gradually become uneven with an increasing amount of fallen rubber particles
Summary
Rubber concrete refers to a new type of concrete that is formed by quantitatively substituting a part of fine aggregate or coarse aggregate with rubber particles. is new concrete is featured with high impact resistance, high crack resistance, and good toughness, for which it has drawn a wide concern from both domestic and foreign scholars. E research on the basic mechanical properties and size effect of rubber concrete can help us further promote the applications of rubber concrete in engineering practice. We conducted experimental research on the basic mechanical properties (i.e., compressive, splitting, and pure shear) and compression size effect of rubber concrete with consideration of 5 different rubber substitution rates (0%, 10%, 20%, 30%, and 40%). By comparing the failure modes and ultimate strength eigenvalues of rubber concrete under different loading conditions, we analyzed the influence of different rubber substitution rates on the basic mechanical properties and compression size effect of rubber concrete from both qualitative and quantitative perspectives and further discussed the underlying mechanisms in detail
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