Method for matching corresponding drying shrinkage under internal humidity gradient of cement-based material

A technology for cement-based materials and humidity gradients, which is used in analytical materials, material inspection products, special data processing applications, etc. Time and resource consumption, the effect of avoiding the interference of time effects

Pending Publication Date: 2021-09-03
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In view of the prior art, the present invention either uses the average shrinkage value in the one-dimensional direction to represent the drying shrinkage deformation at different positions of the entire sample, or measures the drying shrinkage under equilibrium humidity,

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  • Method for matching corresponding drying shrinkage under internal humidity gradient of cement-based material
  • Method for matching corresponding drying shrinkage under internal humidity gradient of cement-based material
  • Method for matching corresponding drying shrinkage under internal humidity gradient of cement-based material

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Embodiment Construction

[0029] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0030] The method for matching the drying shrinkage corresponding to the humidity gradient in the cement-based material of the present invention specifically includes the following steps:

[0031] Step 1, mix cement powder and water to form cement slurry, the cement powder is Jiangnan Onoda P·II 52.5 grade, the water-cement ratio is 0.5, make a mark at 40mm above the bottom of the two PTFE hoses (denoted as P 1 , P 2 ), respectively at P 1 , P 2 Make a 2mm cut at 5mm and 10mm below the mark and insert a steel rod to prevent the cement from seeping out, then insert a 25mm diameter mold and touch the bottom ( figure 1 ); Another parallel sample is used to obtain a three-dimensional image;

[0032] Step 2. After the final setting, place the cement-based sample and parallel samples in saturated calcium hydroxide solution for 28 days, then remove t...

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Abstract

The invention discloses a method for matching corresponding drying shrinkage under humidity gradient in a cement-based material, which comprises the following steps of: matching acquired humidity gradient data at each position in a cement-based sample with acquired drying shrinkage gradient data at each position in a parallel sample, and thus, the drying shrinkage condition of each position in the cement-based sample under the corresponding humidity is obtained. According to the method, the corresponding relation between the continuous humidity field and the strain field in the same sample can be obtained in a short time, and the experiment time and resource consumption are greatly reduced. Compared with a traditional method, the obtained strain is under the real-time and real humidity gradient in the drying process, interference of the time effect of long-time drying is avoided, the number of statistical points reaches tens of thousands, errors of manual calculation are reduced, and the method is an effective method for accurately and rapidly obtaining the cement concrete internal humidity-drying shrinkage deformation relation.

Description

technical field [0001] The present invention relates to a method of matching the corresponding drying shrinkage under a humidity gradient within a cement-based material. Background technique [0002] With the increasing scale of concrete use, its durability is becoming more and more prominent. Shrinkage cracking of cement concrete is a key factor affecting the durability of concrete. Drying shrinkage has become an important and most complicated research object due to its high proportion of the total amount, long existence time, and many uncontrollable factors. Drying shrinkage can account for more than 80% of shrinkage deformation, and it is a long-term behavior, so drying shrinkage has a greater impact on this type of material. When the humidity gradient is generated inside and outside the cement concrete, the water will be lost to the outside, the outer surface will lose water faster, and the deformation will be larger than that of the inside. Cracks will not only direc...

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Application Information

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IPC IPC(8): G01N33/38G01B15/06G06F30/23
CPCG01N33/383G01B15/06G06F30/23
Inventor 万克树贾得明
Owner SOUTHEAST UNIV
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