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Instrument and method for measuring high-temperature thermal expansion of concrete

A concrete and warm technology, applied in the field of measuring instruments, can solve the problem of being unsuitable for the determination of high temperature thermal expansion of concrete, and achieve the effect of ensuring service life, eliminating temperature control delay, and ensuring high precision

Pending Publication Date: 2021-12-10
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing high-temperature thermal expansion patents that can measure larger-sized samples: CN 205982147U, CN 106226347A, CN 208568645U and CN 111044556A, all of which have design deficiencies and are not suitable for the measurement of high-temperature thermal expansion of concrete

Method used

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  • Instrument and method for measuring high-temperature thermal expansion of concrete
  • Instrument and method for measuring high-temperature thermal expansion of concrete
  • Instrument and method for measuring high-temperature thermal expansion of concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0089] Embodiment 1: The high-temperature thermal expansion of concrete at 30-810° C. is measured with a water-binder ratio of 0.4 and a maximum aggregate particle size of 16 mm using the instrument and method for measuring high-temperature thermal expansion of concrete of the present application.

[0090] The concrete sample is a prism sample with a bottom side length of 50mm (more than 3 times the maximum aggregate particle size of 48mm) and a height of 100mm; the auxiliary test is used to determine the heating rate of the sample is 2°C / min, and the constant temperature time of each constant temperature point is shown in the table 1; the 100mm high quartz standard sample is used to measure the expansion compensation value; the measurement results of thermal expansion percentage and thermal expansion coefficient are as follows figure 2 shown.

[0091] Table 1 Constant temperature time of each constant temperature point

[0092]

Embodiment 2

[0093] Embodiment 2: Using the concrete high-temperature thermal expansion measuring instrument and measuring method of the present application, the water-binder ratio is 0.2, the maximum aggregate particle size is 5 mm, and the steel fiber ultra-high-strength concrete with a length of 13 mm is 30 to 825 ° C. high temperature thermal expansion.

[0094] The concrete sample is a prism sample with a bottom side length of 50mm (more than 3 times the steel fiber length of 39mm) and a height of 100mm; the auxiliary test is used to determine the heating rate of the sample is 2°C / min, and the constant temperature time of each constant temperature point is shown in Table 2 100mm high quartz standard sample was used to determine the compensation value; due to the relatively low water-gel ratio, anti-explosion treatment was carried out by drying at 105°C for 3 days; the measurement results of thermal expansion percentage and thermal expansion coefficient were as follows: image 3 shown....

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Abstract

The invention discloses an instrument and a method for measuring high-temperature thermal expansion of concrete, and relates to the technical field of measuring instruments. The instrument comprises a measuring system, a conduction system, a temperature measuring component, a temperature control component and a data processing system. The measuring system comprises a displacement sensor and a first circulating water-cooled jacket, and a gap is formed between the first circulating water-cooled jacket and a furnace body. The displacement conduction system comprises an ejector rod and a storage column, one end of the ejector rod abuts against a probe of the displacement sensor, and the other end of the ejector rod sequentially penetrates through a first support, the first circulating water-cooled jacket and a furnace wall and then extends into a hearth. One end of the storage column penetrates through a furnace door and is placed on a second support through a second circulating water-cooled jacket, and the second support is connected with the furnace door. The data processing system is configured to calculate the thermal expansion percentages and the thermal expansion coefficients of a sample at different temperatures according to the actually measured temperature, the expansion value of the sample, the original height of the sample and the expansion compensation value. The instrument and the method are used for accurately measuring the thermal expansion percentage and the thermal expansion coefficient of a sample with a large size range.

Description

technical field [0001] The present application relates to the technical field of measuring instruments, in particular to an instrument and method for measuring high-temperature thermal expansion of concrete. Background technique [0002] The high-temperature thermal expansion performance of concrete is related to the safety of concrete structures or components under high-temperature conditions such as fire, and is also one of the important parameters for high-temperature and fire-resistant design of concrete materials and structures. However, there is still no suitable high-temperature thermal expansion performance of concrete. Measuring instruments and methods. [0003] The national standard GB / T 7320-2018 "Test Method for Thermal Expansion of Refractory Materials" provides two test methods for refractory materials, namely the differential method and the ejector rod method, but none of the above methods is suitable for the high temperature thermal expansion of concrete. Th...

Claims

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Application Information

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IPC IPC(8): G01N25/16
CPCG01N25/16
Inventor 赵杰王孟奇王明月曾笛波蒋玉川任之东康锐王阳杨娟
Owner BEIJING JIAOTONG UNIV
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