نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی عمران، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
2 دکترای سازه، گروه مهندسی عمران، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
3 دانشجوی دکتری سازه، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره،) قزوین، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
One of the important reasons that causes cracking and deformation in concrete elements, especially in the surface area of concrete, is different climatic conditions and temperature changes. In the previous researches, not many researches have been done regarding the relationship between the penetration rate value and the surface strength. The reason for the lack of research in this regard is the lack of simple methods or the high price of equipment to evaluate surface strength. In this article, infiltration reducing materials with the brand names of Supergel and Mesocrete are used, which are widely used in Iran today. A simple "twist-off" test has been used to evaluate the surface strength. Also, "cylindrical chamber" test was used to measure the permeability. To apply the cycles of temperature changes, the samples were subjected to cycles of 50, 100 and 150 cycles. The obtained results show in the 150th cycle, the surface resistance of ordinary concrete has decreased by about 30%, but the reduction of the surface strength of concrete with penetration reducing materials is less than 20%. Also, the increase in the permeability of ordinary concrete in the 150th cycle is equal to 486%, but this value is half of this value in concretes containing permeation reducing substances. In the following, by using MATLAB software, it was determined that the relationship between permeability and concrete strength is close to each other, and this issue is established in terms of formulation with a first-order plane equation with a correlation coefficient of about 91%.
کلیدواژه‌ها [English]
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