Abstract
Thermal control (passive and active) is a non-destructive testing method. During passive thermal control, the test object is characterized by a temperature field formed during its operation. In active thermal control, the test object is additionally thermally stimulated. This technique is widely used in various areas of construction, energy, mechanical engineering, transport. This paper proposes a variant of active thermal non-destructive assessment of the thermal conductivity coefficient of building materials and products on the example of a fragment of a building structure made of silicate bricks. The test object is subjected to thermal stimulation by an external source of thermal energy before reaching a steady-state thermal regime. Thermography of the test object surfaces is carried out. The average integral temperatures of surfaces or individual sections of the test object are calculated. The coefficient of thermal conductivity of the test object is determined, which is used to calculate its thermal resistance (resistance to heat transfer). After that, the coefficient of heat transfer is calculated. The method was implemented in laboratory conditions. It can be used in natural and operational conditions for accurate and quick determination of the key thermophysical properties of building materials and products.
Highlights
The experimental methods for assessing the quality, durability, reliability and safety of traditional and modern building materials and products are characterized by a vast variety and complexity [1–7]
The methods and means of thermal control (TC) and technical diagnostics (TD) are used to determine the listed characteristics of the investigated building materials and finished products according to their thermophysical properties (TPP) [10,11,18], namely: thermal conductivity, thermal diffusivity, heat capacity, thermal activity, heat resistance, etc. [18]
The active method of thermal non-destructive testing is a method of thermal non-destructive testing, in which the test object is thermally stimulated by an external source of thermal energy
Summary
The experimental methods for assessing the quality, durability, reliability and safety of traditional and modern building materials and products are characterized by a vast variety and complexity [1–7]. The methods and means of TC and TD are used to determine the listed characteristics of the investigated building materials and finished products according to their thermophysical properties (TPP) [10,11,18], namely: thermal conductivity, thermal diffusivity, heat capacity, thermal activity, heat resistance, etc. Non-destructive testing is a field of science and technology that encompasses the study of physical principles, the development, improvement and application of methods, means and technologies for technical control of objects that do not destroy or worsen their serviceability. Thermal non-destructive testing is the non-destructive testing based on the registration of temperature fields of the test object. Non-contact thermometry is a set of methods and means for measuring temperature based on noncontact and remote measurement of thermal radiation from the surface of a test object
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