مهندسی عمران شریف (May 2020)
بررسی تأثیر افزایش دما در خصوصیات مکانیکی و ریزساختار بتن حاوی نانولولهی کربنی چندجداره
Abstract
In this paper, the effect of multi-walled carbon nanotubes on the properties of concrete was evaluated in the post-heat treated condition. Following this, a number of cylindrical specimens (10 x 20 cm) including multi-walled carbon nanotubes in different percentages of 0.5, 1 and 1.5\% by weight of cement were cast. Later on, concrete specimens in the electric furnace were exposed to temperatures of 25, 100, 250,500 and $700^{0}C$ and after cooling down, compressive and tensile strength tests were carried out on them. The results showed that by increasing multi-walled carbon nanotubes in concrete, compressive and tensile strengths of concrete were increased up to 138\% and 88\%, respectively. In addition, dissipation of energy and modulus of elasticity of concrete specimens were up to 2 times more than that of control concrete specimens. The SEM test results indicated that a strong bond between concrete particles exists at the room temperature and upper than that.
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