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Method for inverting adiabatic temperature rise of concrete

An adiabatic temperature rise and concrete technology, applied in the field of obtaining the adiabatic temperature rise of concrete, can solve the problems of low test accuracy, unable to reflect concrete heat release process well, unable to completely prevent concrete heat dissipation, etc., and achieve a simple and clear formula. Effect

Inactive Publication Date: 2014-07-16
TSINGHUA UNIV +2
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  • Application Information

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Problems solved by technology

Although this method reduces the error to a certain extent, it cannot completely prevent the concrete from dissipating heat, and it cannot reflect the late heat release process of concrete well when the age is relatively long, and the test accuracy is still not high.

Method used

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  • Method for inverting adiabatic temperature rise of concrete
  • Method for inverting adiabatic temperature rise of concrete
  • Method for inverting adiabatic temperature rise of concrete

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Experimental program
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Effect test

Embodiment approach

[0025] The invention measures the temperature of concrete at different measuring points at different times by arranging temperature sensors at different positions on the same section of concrete along the radial direction, and then calculates the temperature field through a differential method, and uses the minimum sum of the squares of the measured temperature and the calculated temperature difference to optimize the adiabatic inversion temperature rise. The specific method can be implemented as follows:

[0026] 1) Firstly, make a cylindrical hollow mold. The two sides are detachable for easy transportation and demoulding. Holes are left on both sides at the middle height. A layer of thermal insulation material [2] is laid on the lower part of the hollow mold to simulate radial one-dimensional heat dissipation. At the same time, thermal insulation materials are laid around the mold respectively, with a thickness of one-third to one-fifth of the lower thermal insulation mater...

Embodiment

[0053] In a specific implementation, the inner diameter of the cylinder is 400mm and the height is 600mm. The insulation material adopts rubber and plastic sponge, 80mm of insulation material is laid on the upper and lower parts, and 20mm of insulation material is laid on the four sides. A total of seven temperature sensors are arranged on the middle height section, one of which is arranged in the center of the circle along the radial direction, and the sensor spacing is 50mm, as figure 2 shown. Read the temperature every 5 minutes, take the time step Δτ as 5min, and the thickness h of each layer as 50mm.

[0054] Divide the seven measurement positions into two groups, each group of measurement points are in the same radial direction, respectively figure 2 Sensor point 1234 and sensor point 7654 are shown. The initial measurement of each group is taken as the initial condition, the measurement of the first group of No. 1 and No. 4 sensors is the boundary condition, and th...

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Abstract

A method for obtaining adiabatic temperature rise of concrete relates to method for measuring and acquiring temperature by the use of temperature sensors and a temperature acquisition module and inverting adiabatic temperature rise by measured temperature calculation. By arranging temperature sensors along the radial direction at different positions on the same section of concrete, temperatures of concrete at different measuring points and at different times are measured; a temperature field is calculated through difference; and inversion of adiabatic temperature rise is optimized by the utilization of measured temperature and calculated temperature. Instead of getting down to reducing heat radiation of concrete, temperature of concrete during the process of heat radiation is measured to invert adiabatic temperature rise. Through data analysis, it proves that a later exothermic process of concrete can be well reflected.

Description

technical field [0001] The invention relates to a method for obtaining the adiabatic temperature rise of concrete, in particular to obtaining the adiabatic temperature rise of concrete in the late stage of heat release. Background technique [0002] Adiabatic temperature rise is related to temperature control in dam construction and is an important performance of mass concrete. At present, only the adiabatic temperature rise test at the age of 28 days is generally carried out, and the adiabatic chamber of the instrument must meet the conditions of the adiabatic test, that is, the heat of hydration of the gelling material does not dissipate to the external environment. The surface of the specimen is exposed, and the temperature of the adiabatic chamber should track the temperature of the center of the concrete specimen, with a difference not greater than ±0.1°C. As the age increases, the cumulative loss of heat caused by the temperature difference between the two becomes lar...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 胡昱李庆斌徐峥高鹏王毅苏军安梁国贺
Owner TSINGHUA UNIV
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