The mechanism of concrete durability under uniaxial compressive load has been studied through chloride penetration experiments in this contribution. It has been found that there is a good corresponding relationship between chloride penetration resistance of concrete and the applied compressive stress level. With increasing of the applied compressive load, chloride penetration depth and content both decreased firstly. After the compressive load up to a critical level, they began to increase quickly. The apparent diffusion coefficient and chloride concentration at the surface also increase with the same rule. It is shown that chloride penetration of concrete is a complex process. So the effect of mechanical load should be considered as an important factor for prediction of service life of reinforced concrete structures in marine environment.
The total porosity of high performance concrete specimens after different level uniaxial tensile loading were measured to reflect the damage degree of mechanical load to the microstructure of the concrete. Meanwhile, considering the environmental characteristics of the ocean tidal zone, chloride penetration tests of the concrete were carried out with salt solution capillary absorption method. Based on the profile of chloride measured from specimens, chloride diffusion coefficients of the concrete under uniaxial tensile load with different levels are determined further by Fick’s second law. Results show that both of total porosity and chloride diffusion coefficient of the concrete are increased significantly after short-term tensile loading. And the evolutions of the porosity and chloride diffusion coefficient are similar with the development of micro-cracks under uniaxial tensile load.
Religious giving has been argued to be different compared to non-religious giving, because it influences after-life consumption while contributions to non-religious organizations are irrelevant to after-life consumption. The study herein examines this theoretical argument by investigating the relationships between age and religious and non-religious giving using the data of the Survey of Social Development Trends from Taiwan. From categorized contributions, this study estimates the effects of age, income, and price of giving on religious, charitable, academic, medical, and political contributions, as well as on the probability of providing volunteer work and the frequency of religious participation. The findings suggest that the positive relationships between age and the level of giving are stronger for religious and charitable giving while the positive effects of age on academic and medical giving are much weaker, and there is no significant relationship between age and political giving. That is, religious giving and charitable giving are closely related to afterlife consumption, but the effects of age on academic giving and medical giving are considerably different. Moreover, older people are more likely to provide volunteer work and attend more religious activities than younger individuals. Contributions to religious and charitable groups are positively related to contributions to academic, medical, and political organizations.
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