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Method for measuring brick firing temperature

A technology of firing temperature and temperature map, applied in the direction of material magnetic variable, investigation stage/state change, etc., can solve the problems of limited firing temperature range, unmeasured firing temperature, and difficulty in calculating the firing temperature of bricks , to achieve the effect of simple operation

Inactive Publication Date: 2019-03-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Yet the method for determining brick body firing temperature above has many weak points
First, the above method has limitations on the determined firing temperature range. For example, the method with different thermal expansion coefficients at different firing temperatures is only suitable for measuring bricks whose firing temperature ranges from 500°C to 1200°C. If the firing temperature is too high or too low to measure
Second, the above method has high precision requirements for the quality or geometric dimensions of the test samples, and even requires special equipment for sample preparation, and testing the firing temperature of bricks requires some large, expensive, professional instruments and equipment, generally only specialized The laboratory has these equipment
Third, the above method can only infer that the firing temperature of the brick body is higher (lower) than a certain temperature based on certain characteristic minerals, or compare the firing temperature of two brick bodies, and it is difficult to measure the specific firing temperature of the brick body
But, also lack a kind of quantification and the method for measuring brick firing temperature with little error in the prior art

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  • Method for measuring brick firing temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Step 1. Take clay and make 6 cubes of clay with a side length of 4cm. The above clay blocks were fired at temperatures of 700°C, 800°C and 900°C respectively to make clay bricks. The firing temperatures of 700°C, 800°C and 900°C fired 2 clay bricks each. These two clay bricks were used as parallel samples to measure the firing temperature. Smooth the surface of the brick body to be measured with sandpaper.

[0064] Step 2. Assume that the possible firing temperature range of the brick body fired at 700°C is [500°C, 850°C], and assume that the possible firing temperature range of the brick body fired at 800°C is [600°C, 900°C]. The possible firing temperature range of bricks fired at 900°C is [700°C, 1000°C]. Place the bricks in the high-temperature furnace to ensure that the distance between the bricks is greater than 5cm. Record the number of each brick and its corresponding position in the high-temperature furnace. Slowly raise the temperature of the high-temperatu...

Embodiment 2

[0072] Step 1. Obtain 5 pieces of ancient bricks from Ying'e Lane, Helan Bridge, Renyi Street, and city walls in Pingyao Ancient City. Each ancient brick was cut with a cutting machine to produce two cube samples with a side length of 4 cm. Take 2 above-mentioned cube samples as parallel samples to measure the firing temperature of this ancient brick.

[0073] Step 2. Assuming that the possible firing temperature range of ancient bricks is [300°C, 900°C], place the ancient brick samples in a high-temperature furnace to ensure that the distance between them is greater than 5cm, and record the serial number of each ancient brick sample and its At the corresponding position in the high temperature furnace, slowly raise the temperature of the high temperature furnace to 300° C. and keep it for 24 hours.

[0074] Turn off the power of the high-temperature furnace, and after the ancient bricks in the high-temperature furnace cool down to room temperature, take out the samples, and ...

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Abstract

The invention discloses a method for measuring the brick firing temperature. The method comprises the following steps of obtaining a brick body; performing flat grinding; measuring the magnetization rate of the brick body at different temperatures to obtain a magnetization rate-temperature diagram; calculating the change of the magnetization rate of the brick body at the two adjacent temperaturesto obtain the magnetic rate change-temperature diagram; judging the brick body firing temperature according to the change of horizontal and vertical coordinates of the magnetic rate change-temperaturediagram. The method for measuring the brick firing temperature has the advantages that the operation is simple; no requirement exists on the quality and the dimension of the brick body; the brick firing temperature can be quantificationally measured; the errors are small.

Description

technical field [0001] The invention relates to the technical field of measuring the firing temperature of bricks, in particular to a method for measuring the firing temperature of bricks (especially ancient bricks) by using magnetic susceptibility. Background technique [0002] There are a large number of ancient buildings using clay bricks as building materials at home and abroad. At present, most of these ancient buildings have become cultural relics protection units. However, the ancient bricks in many ancient buildings are suffering from severe weathering damage due to years of natural forces, and they are in urgent need of restoration and protection. The firing temperature of the brick body determines the physical and mechanical properties and weathering resistance of the brick. [0003] According to the different physical and chemical properties of bricks at different firing temperatures, many experts have proposed the following methods for measuring the firing tempe...

Claims

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Application Information

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IPC IPC(8): G01N25/12G01N27/72
CPCG01N25/12G01N27/72
Inventor 张中俭申佳妮
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)