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Concrete heat conductivity coefficient calculation method considering aggregate shape

A technology of thermal conductivity and calculation method, which is applied in the fields of materials, civil engineering, and hydraulic engineering, can solve the problems that cannot be well adapted to the complexity of engineering authenticity, high-performance concrete design, etc., and achieve high scientific research and practical application value, cumbersome operation, time-saving effect

Active Publication Date: 2020-09-18
HOHAI UNIV
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Problems solved by technology

Due to the limitations of the existing theoretical models, it cannot be well adapted to the reality of actual engineering and the complexity of high-performance concrete design

Method used

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  • Concrete heat conductivity coefficient calculation method considering aggregate shape
  • Concrete heat conductivity coefficient calculation method considering aggregate shape
  • Concrete heat conductivity coefficient calculation method considering aggregate shape

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Embodiment Construction

[0063] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0064] Aiming at the problem that the existing models cannot take into account both aggregate and saturation, the present invention proposes a prediction model for the effective thermal conductivity of dry, unsaturated and saturated concrete under the theoretical framework of mesomechanics, such as figure 1 As shown, it specifically includes the following steps:

[0065] Step 1: Calculate the temperature gradient and volume fraction of each phase.

[0066] Heat conduction is driven by temperature gradients. For the passive temperature field, the functional expressions of heat flux q and temperature gradient T are as follows:

[0067]

[0068] In the formula: K is the second-order tensor of thermal conductivity, T is the temperature, x j is the coordinate, and the negative sign indicates that the heat conduction is along the direction of decreasing tempe...

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Abstract

The invention discloses a concrete heat conductivity coefficient calculation method considering aggregate shape. comprises the following steps that firstly, the temperature gradient and volume fraction of each phase are calculated; a second-order concentration factor Ar is introduced, and the relation between the temperature gradient of each phase and the volume average temperature gradient is established; secondly, in the single inclusion problem, the concentration factor of single inclusion is used for connecting the temperature gradient of single inclusion with T1; single inclusion is popularized to multi-phase inclusion, and the coupling effect of saturation, phases (aggregate phase, liquid phase and gas phase), shapes of the phases and other factors is considered; and finally, the effective heat conductivity coefficients of the concrete considering different saturations in the presence of the aggregate are obtained. The method provides a theoretical basis for calculation and prediction of the effective heat conductivity coefficient of the concrete, is used for designing a high-performance concrete material and predicting the service cycle life of a concrete structure, has highscientific research and practical application values, can save a large amount of time, manpower and material resources, and is high in matching degree of a prediction result and an experiment.

Description

technical field [0001] The invention belongs to the technical field of materials, civil engineering and water conservancy engineering, and in particular relates to a calculation method of concrete thermal conductivity considering aggregate shape. Background technique [0002] Mastering the thermal conductivity of concrete is of great significance to the safe operation of geothermal engineering and nuclear power plant engineering. In general, concrete can be divided into dry, unsaturated and saturated states according to whether the capillary is filled with water or not. In order to quantitatively study the heat transfer process in concrete, reduce complex, laborious and time-consuming experiments and numerical simulations, and establish an accurate prediction of the effective thermal conductivity of concrete, it is of great significance and necessity for the safe operation of the project and the design of high-performance concrete materials. [0003] There are three main ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20G01N25/18
CPCG01N25/20G01N25/18
Inventor 许文祥郭伟奇蒋亚清
Owner HOHAI UNIV
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