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International Journal of Nonlinear Analysis and Applications، جلد ۱۳، شماره ۱، صفحات ۳۷۹-۳۹۶
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عنوان انگلیسی Evaluation of longitudinal wave velocity and elasticity modulus of concrete at different ages considering mixing ratios
چکیده انگلیسی مقاله Concrete is a material that the mechanical properties of which change over time. This change is due to chemical reactions within the concrete known as hydration. One of these properties is the modulus of elasticity and longitudinal wave velocity, which has a direct relation with the concrete age and its setting. Just after the materials mixing, the concrete setting is fast, and over time its rate decreases. Here, a series of cubic concrete specimens are prepared and changing in longitudinal wave velocity and modulus of elasticity in different ages is monitored during the process of curing and a relationship has been presented. Materials specifications impact and concrete mixing ratios, including the water to cement ratio and fine to coarse aggregates ratio is studied. Ultrasonic wave velocity has been increased faster at early ages of specimens where the concrete setting process is fast and in last days, rates of increasing the longitudinal wave velocity decreases. An increase in the water to cement ratio leads to increases in the longitudinal wave velocity over time. The empirical equations have been formulated as logarithmic curves. These empirical equations have been developed and a model with more efficiency and precision has been presented. These empirical equations can be used in the analytical and numerical analysis of structures. These models can be used to determine the loading time of concrete structures and to predicting their other physical and mechanical properties, such as strength and stiffness.
کلیدواژه‌های انگلیسی مقاله Concrete setting, Concrete age, Non-destructive test, Ultrasonic wave velocity, Modulus of elasticity
نویسندگان مقاله Mehdi Sabagh |
Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

Mansour Asgari Khorasgani |
Department of Civil Engineering, Islamic Azad University, Najafabad Branch, Najafabad, Iran

Mohammad Taghi Kazemi |
Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

نشانی اینترنتی https://ijnaa.semnan.ac.ir/article_5504_43df1994326bbc284b3c5531fc2d5c09.pdf
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