Architecture
S.A. Mir Bagheri; S. Boudaghpour; S.A. Hashemi Monfared
Abstract
Erosion and sedimentation phenomena have many destructive effects on the environment and human life. One of their most important effects is to reduce the volume of dam reservoirs. When the tank can no longer perform the intended service, its useful life is over. So far, several models have been proposed ...
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Erosion and sedimentation phenomena have many destructive effects on the environment and human life. One of their most important effects is to reduce the volume of dam reservoirs. When the tank can no longer perform the intended service, its useful life is over. So far, several models have been proposed to simulate the entry of sediment into the tank, most of which are based on laboratory observations. In this article, Ekbatan Dam has been selected as a case study. First, using the flow profile measurements in the main river, the inlet sediment connection equation to the reservoir is solved. Then, using the sediment continuity equation and four different transfer equations, the amount of precipitation effective in reducing the life of the tank is obtained. These values have been used to calculate the reduction in reservoir volume over a 50-year period, indicating that the Anglo-Hansen method was more consistent with the actual reservoir conditions than other equations. Finally, according to the final equilibrium conditions, the floor profile of the tank is obtained. The results show that after this period, a lot of sediment has accumulated at the foot of the dam and an increase of up to 15 meters has been created.Send
Architecture
A. A. Ramezanianpour; A. Haghollahi; A. Pourkhorshidi
Abstract
Abrasion of industrial concrete floors is a major problem resulting in their lower service lives. Attempt has been made to relate the abrasion resistance of concrete to its compressive strength. However there are other factors which influence the abrasion resistance of concrete. In this study, several ...
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Abrasion of industrial concrete floors is a major problem resulting in their lower service lives. Attempt has been made to relate the abrasion resistance of concrete to its compressive strength. However there are other factors which influence the abrasion resistance of concrete. In this study, several concrete mixtures containing different types of cements, aggregates, admixtures and additives such as silica fume and styrene butadiene rubber (S.B.R) polymer were made to assess their abrasion resistances. All concrete specimens were tested for wear action in accordance with ASTM and EN standard test methods. Based on data obtained from the tests, an empirical model was proposed to evaluate the abrasion resistance of different concretes. Results of this investigation show that the incorporation of silica fume, S.B.R polymer and granite aggregates in concrete improve its abrasion resistance. The proposed mathematical model is capable to predict the abrasion resistance of concrete and provide a guide for selection of materials to produce more durable concrete when subjected to wear action.
