A method for retrieving the adiabatic temperature rise of concrete using two-dimensional heat dissipation

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: 2017-07-07
TSINGHUA UNIV +2
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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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  • A method for retrieving the adiabatic temperature rise of concrete using two-dimensional heat dissipation
  • A method for retrieving the adiabatic temperature rise of concrete using two-dimensional heat dissipation
  • A method for retrieving the adiabatic temperature rise of concrete using two-dimensional heat dissipation

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Embodiment approach

[0028] The invention measures the temperature of concrete at different measuring points at different times by arranging temperature sensors at different positions along the radial direction on multiple cross-sections of the concrete, and then calculates the temperature field through a differential method, and uses the minimum optimization of the square sum of the difference between the measured temperature and the calculated temperature Invert the adiabatic temperature rise. The specific method can be implemented as follows:

[0029] 1) First make a cylindrical hollow mould, both sides of which are detachable for easy handling and demoulding, lay a layer of insulation material 2 on the lower part of the hollow mould, and lay insulation materials around the mould, the thickness of which is 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 with different heights along the...

Embodiment

[0057] 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. Arrange seven temperature sensors on the sections with heights of 300mm, 375mm, and 450mm respectively, one of which is arranged radially at the center of the circle, and the sensor spacing is 50mm, such as figure 2 shown. Read the temperature every 5 minutes, take the time step Δτ as 5min, the radial temperature measurement point spacing h as 50mm, and the axial temperature measurement point spacing l as 75mm.

[0058] Divide the 21 measurement positions into two groups, each group of measurement points are in the same radial direction, respectively figure 1 Sensor measuring points 4, 5, 6, 7, 11, 12, 13, 14, 18, 19, 20, 21 and 7, 8, 9, 10, 14, 15, 16, 17, 21, 22 shown , No. 23 and No. 24...

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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 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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Patent Type & Authority Patents(China)
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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