RU2010110178A - ULTRASONIC METHOD OF CONTROL OF THE CONCRETE ELASTICITY MODULE IN CONCRETE AND REINFORCED CONCRETE STRUCTURES - Google Patents
ULTRASONIC METHOD OF CONTROL OF THE CONCRETE ELASTICITY MODULE IN CONCRETE AND REINFORCED CONCRETE STRUCTURES Download PDFInfo
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- RU2010110178A RU2010110178A RU2010110178/28A RU2010110178A RU2010110178A RU 2010110178 A RU2010110178 A RU 2010110178A RU 2010110178/28 A RU2010110178/28 A RU 2010110178/28A RU 2010110178 A RU2010110178 A RU 2010110178A RU 2010110178 A RU2010110178 A RU 2010110178A
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- concrete
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- elasticity
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Ультразвуковой способ контроля модуля упругости бетона в бетонных и железобетонных конструкциях сооружений, включающий измерение скорости ультразвука на бетонных образцах - призмах квадратного сечения или цилиндрах круглого сечения с отношением высоты к ширине (диаметру), равным 4, и материале конструкций, механические испытания образцов бетона при действии на них циклично-ступенчатой осевой сжимающей нагрузки до уровня 30% разрушающей нагрузки на гидравлическом прессе, тензометрические испытания по определению приращения упруго-мгновенной относительной, продольной деформации образцов бетона при уровне нагрузки, равной 30% разрушающей нагрузки, построение градуировочной зависимости «скорость ультразвука - модуль упругости бетона» по результатам ультразвуковых, тензометрических и механических испытаний образцов бетона и определение модуля упругости бетона конструкции по результатам ультразвуковых измерений и предварительно построенной градуировочной зависимости, отличающийся тем, что определяют по различным сериям образцов бетона среднюю влажность испытанных образцов бетона, среднюю скорость распространения ультразвука в бетонных образцах, а также средний модуль упругости образцов бетона и среднюю влажность бетона контролируемой зоны в конструкции сооружения, после чего величину модуля упругости бетона в конструкции устанавливают из зависимостей: ! ; ! ; ! ; ! - коэффициент, учитывающий влияние влажности бетона на скорость прохождения в нем ультразвука; ! ; ! ; ! , ! где k1=кгс/см2, k2=1/ln (кгс/см2), k3=1/[(1-м/с)·ln (кгс/см2)] - коэффициент размерности; ! e=2,71828… - основание натуральных логарифмов; ! - мод� An ultrasonic method for monitoring the modulus of elasticity of concrete in concrete and reinforced concrete structures of structures, including measuring the speed of ultrasound on concrete samples - square prisms or round cylinders with a height to width (diameter) ratio of 4 and the material of structures, mechanical testing of concrete samples under action on them a cyclic-step axial compressive load up to the level of 30% of the breaking load on the hydraulic press, tensometric tests to determine the increment of elastic-mn the relative relative longitudinal deformation of concrete samples at a load level equal to 30% of the breaking load, the construction of the calibration dependence "ultrasound speed - modulus of elasticity of concrete" according to the results of ultrasonic, tensometric and mechanical tests of concrete samples and the determination of the modulus of elasticity of concrete construction according to the results of ultrasonic measurements and preliminary constructed calibration dependence, characterized in that they determine the average humidity tested by different series of concrete samples x concrete samples, the average speed of ultrasound propagation in concrete samples, as well as the average modulus of elasticity of concrete samples and the average humidity of concrete in the controlled area in the structure of the structure, after which the value of the elastic modulus of concrete in the structure is determined from the dependencies:! ; ! ; ! ; ! - coefficient taking into account the effect of humidity of concrete on the speed of passage of ultrasound in it; ! ; ! ; ! ! where k1 = kgf / cm2, k2 = 1 / ln (kgf / cm2), k3 = 1 / [(1 m / s) · ln (kgf / cm2)] is the dimension coefficient; ! e = 2.71828 ... - the base of the natural logarithms; ! - mod
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RU2010110178/28A RU2442153C2 (en) | 2010-03-17 | 2010-03-17 | Method for ultrasonic inspection of concrete resilience in concrete and reinforced cocrete constructions |
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RU2010110178/28A RU2442153C2 (en) | 2010-03-17 | 2010-03-17 | Method for ultrasonic inspection of concrete resilience in concrete and reinforced cocrete constructions |
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RU2010110178A true RU2010110178A (en) | 2011-09-27 |
RU2442153C2 RU2442153C2 (en) | 2012-02-10 |
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RU2010110178/28A RU2442153C2 (en) | 2010-03-17 | 2010-03-17 | Method for ultrasonic inspection of concrete resilience in concrete and reinforced cocrete constructions |
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RU2707984C1 (en) * | 2019-04-26 | 2019-12-03 | федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" | Method of determining fire resistance of construction materials and structural elements |
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Effective date: 20120318 |