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Strength model of slag concrete with different curing temperature based on Microstructure

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Document pages: 12 pages

Abstract: Ground blast furnace slag is a by-product produced in the process of iron and steel production. It has been widely used in concrete structures to reduce carbon dioxide emission and improve durability. In this paper, a numerical model is proposed to evaluate the compressive strength development of slag mixed concrete under isothermal curing temperature and time-varying curing temperature. Firstly, the numerical model starts with the cement slag mixed hydration model, which simulates the cement hydration and slag reaction. The acceleration of cement hydration and slag reaction at high temperature is simulated by Arrhenius law. Secondly, the gel space ratio of hardened concrete is calculated by reaction degree of cement and slag. Using modified Powers gel space specific strength theory, te strength of slag blended concrete is evaluated considering both strengthening factors and weakening factors involved in strength development process. The proposed model is verified using experimental results of strength development of slag blended concrete with different slag contents and different curing temperatures.

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