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Method for inverting adiabatic temperature rise of concrete by using two-dimensional heat radiation
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A technology of adiabatic temperature rise and concrete, which is applied in the field of obtaining concrete adiabatic temperature rise, can solve the problems of low test accuracy, inability to completely prevent concrete heat dissipation, and inability to well reflect the heat release process of concrete, and achieve a simple and clear formula Effect
Active Publication Date: 2014-08-27
TSINGHUA UNIV +2
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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.
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[0028] The invention measures the temperature of the concrete at different measuring points at different times by arranging temperature sensors at different positions on multiple cross sections of the concrete in the radial direction, and then calculates the temperature field through a difference method, and uses the minimum sum of squares of the measured temperature and the calculated temperature difference to optimize Inversion of adiabatic temperature rise. The specific method can be implemented as follows:
[0029] 1) First make a cylindrical hollow mold, which can be disassembled on both sides for easy handling and demoulding. A layer of insulation material is laid on the lower part of the hollow mold. At the same time, insulation materials are laid around the mold with a thickness of one third of the lower insulation material. To one-fifth, used to slow down the heat dissipation rate, such as figure 1 Shown
[0030] 2) Select m positions of different heights along the heigh...
Embodiment
[0057] In a specific implementation, the cylinder has an inner diameter of 400mm and a height of 600mm. The insulation material is made of rubber-plastic sponge, 80mm insulation material is laid on the upper and lower parts, and 20mm insulation material is respectively laid around. Seven temperature sensors are arranged on the sections with heights of 300mm, 375mm, and 450mm respectively, one of which is at the center of the circle and is arranged along the radial direction. The sensor spacing is all 50mm, such as figure 2 Shown. The temperature is read every 5 minutes, taking the time step Δτ as 5 min, the distance between the radial temperature measuring points h is 50 mm, and the distance between the axial temperature measuring points l is 75 mm.
[0058] Divide 21 measuring positions into two groups, each group of measuring points are in the same radial direction, respectively figure 1 Shown 4,5,6,7,11,12,13,14,18,19,20,21 sensor measuring points and 7,8,9,10,14,15,16,17,21...
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Abstract
The invention discloses a method for inverting adiabatic temperature rise of concrete by using two-dimensional heat radiation, relating to the acquisition of adiabatic temperature rise of concrete in the later stage of heat release. The method comprises the steps: measuring temperatures of concrete at different time and different measuring points by arranging temperature sensors at different positions on a plurality of cross sections of the concrete along the radial direction, calculating a temperature field through differentiation; and optimizing and inverting the adiabatic temperature rise by using actually measured temperature and calculated temperature. Because no accumulated heat loss in a conventional method exists, the later-stage heat release process of the concrete can be well reflected. A formula used in the method is simple and clear, and brings the convenience for compiling relevant programs for calculation. Meanwhile, the method can ensure that the temperature of a test piece accords with a temperature change of the concrete in a project through controlling the environment temperature, thus the obtained adiabatic temperature rise more accords with the engineering practice, the defect in a conventional method that the temperature of concrete in the later stage of the heat release is high and does not accord with the engineering practice is effectively overcome.
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 the concrete in the later stage of heat release. Background technique [0002] Adiabatic temperature rise is related to temperature control during dam construction and is an important performance of mass concrete. At present, only 28-day-old adiabatic temperature rise test is generally performed, and the adiabatic chamber of the instrument must meet the adiabatic test conditions, that is, the heat of hydration of the cementitious material is not emitted to the external environment. The surface of the test piece is bare, and the temperature of the insulation chamber should track the temperature of the center of the concrete sample, and the difference should not exceed ±0.1℃. As the age increases, the cumulative heat loss caused by the temperature difference between the two will increase, so it is difficult ...
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