Method for indoor measurement surface heat emission coefficient of concrete

Abstract

The invention discloses a method for indoor measurement of the surface heat emission coefficient of concrete. According to the method, the temperature of the environment where an experiment block is located, the moisture content of a heat preservation material and other parameters can be precisely controlled, the surface heat emission coefficient of the experiment block is subjected to high-precision inverse analysis and calculation, and then the surface heat emission coefficient of the concrete covering the heat preservation material (including a water containing frozen heat preservation material) can be precisely tested. The method comprises the steps that 1, the experiment block is manufactured, and a certain number of temperature testing points are buried in the experiment block; 2, the experiment block with the heat preservation material laid is placed in a freezing and thawing test box for automatically controlling and recording the temperatures of the testing points, the temperature of an antifreezing solution and the temperature in the box, wherein the heat preservation material comprises a water containing frozen material, and reasonable temperature value is set for an experiment; 3, according to experiment data, inverse analysis is carried out to obtain the experiment block surface heat emission coefficient beta1 of the experiment block with the heat preservation material laid under the experiment condition; 4, through formula derivation and calculation, the surface heat emission coefficient betaS of the concrete under the field condition is obtained.

Description

technical field [0001] The invention belongs to the technical field of concrete temperature control and anti-cracking, and in particular relates to a method for indoor measurement of the heat release coefficient of concrete surface, which can accurately and efficiently measure the heat release coefficient of concrete covered with thermal insulation materials (including water-containing freezing thermal insulation materials) . Background technique [0002] Temperature load is the main load for dam cracking, and the temperature difference between inside and outside is one of the main temperature loads. Effective thermal insulation measures can better control the temperature load. In alpine regions, the annual average temperature is low and the daily temperature varies greatly. The most important load of concrete cracking, and thermal insulation measures can greatly reduce the temperature load of concrete. The insulation materials used in the dam body include: polystyrene boar...

AI Technical Summary

Problems solved by technology

However, the field test costs a lot, the test period is long, and the test block can not be used repeatedly in other projects, and the interference is large during the test process, and the reliability of the test results needs to be improved.

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