科研之友
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摘要
Many concrete structures such as dams, abutment piers of bridges, offshore platforms, costal and port structures, etc., are often submerged in water. The water within concrete pores or cracks has a great influence on the macroscopic mechanical properties of concrete, especially its global modulus of elasticity and strength. The present study investigates the quantitative influence of water content, i.e. concrete porosity, on the global mechanical properties of saturated concrete. By a three-phase spherical model and a hollow cylindrical rod model, the effect of porosity on the effective bulk and shear moduli of saturated concrete is studied in a quantitative manner. Based on the assumption that the pore-water has no shear capacity, the effective elastic modulus and Poisson%26apos;s ratio of the saturated concrete are obtained using the theory of elasticity subsequently. Furthermore, according to the maximum tensile stress failure criterion, the quantitative relationships between the porosity and the global tensile strengths as well as their corresponding tensile peak strains of concrete in dry and saturated states are established. Finally, a comparison between the theoretical results and experimental data is made to verify the rationality and the accuracy of the present approach. The present results are comparable to the experimental observations of Yaman et al. [4,23], indicating that the present approach is applicable to predict the effective mechanical properties of concrete in both dry and saturated states. Moreover, it is found that compared with dry concrete, the water within saturated pores limits the surrounding concrete matrix deforming into pores, causing the enhancement of the global elastic modulus and Poisson%26apos;s ratio of concrete. The effect of pore-water on concrete tensile strength is significant and should not be neglected in design.
- 出版日期2012-12
- 单位北京工业大学
