نوع مقاله : یادداشت پژوهشی
نویسندگان
1 دانشکده فنی و مهندسی، دانشگاه بینالمللی امام خمینی (ره)، قزوین
2 پژوهشکده سوانح طبیعی، تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Today, the tests that are used to measure the infiltration volume and estimate the mechanical characteristics of concrete have few capabilities. Therefore, methods that can directly measure or evaluate the compressive strength and permeability of concrete with little damage are needed. Also, the effect of acute environmental conditions on new materials that are widely used in Iran today to reduce the permeability of concrete should be investigated. To measure the permeability and water penetration depth in concrete according to BS-EN-12390-8 and DIN-1048-5 standards, it is necessary to break the sample. Therefore, in this research, the new methods of cylindrical chamber and friction transfer were used to measure the depth of water penetration and evaluate the compressive strength of concrete, respectively. One of the advantages of the above methods is that there is no need to break concrete. Additives used in concrete include fibrous microsilica and microsilica, which are widely used in Iran. Concretes with different resistances were used, some of which were evaluated under acute conditions with the number of cycles of 0, 50, 100 and 150 cycles. The addition of fibrous microsilica has also reduced the amount of water penetration in concrete by about 50%. Also, the effects of freezing and thawing cycles on permeability have decreased with the passage of time, so that 70% of the increase of water penetrated into concrete occurred in the first 50 cycles.
کلیدواژهها [English]
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