نوع مقاله : یادداشت پژوهشی
نویسندگان
1 دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین
2 دانشکده فنی و مهندسی، دانشگاه بینالمللی امام خمینی (ره)، قزوین
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Today, in-situ tests that are used to measure the penetration volume and mechanical characteristics of concretes have few capabilities. Therefore, methods that can directly measure the compressive strength and permeability of concrete with little damage are needed. Also, the effect of acute conditions on new materials that are widely used in Iran today to reduce the permeability of concrete should be investigated. In order to measure the permeability and depth of water penetration into concrete according to standards, it is necessary to break the sample, so in this research, a new cylindrical chamber method is used to measure the depth. Water penetration (which does not require breaking the concrete) has been used. Also, the compressive strength of concrete has been measured with the new friction transfer test (this test directly measures the compressive strength with high accuracy without breaking the concrete). Ordinary concretes, containing fibrous micro silica and micro silica, which are widely used in Iran, were used. Concretes with different strength and under freezing and melting conditions were tested with different cycles. According to the obtained results, the penetration depth and compressive strength of concrete can be measured using linear equations without the need to break the sample and with a high correlation coefficient. Also, the mentioned additive reduced the infiltration volume by about 50%. The negative effects of ice and melting are more in the beginning, but with the passage of time, the negative effects decrease. Thus, 70% of the increase in infiltrated water occurred in the first 50 cycles.
کلیدواژهها [English]
)