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Method for measuring penetration depth and penetration amount of cement-based material surface protective agent using fluorescent dyes

A technology of cement-based materials and fluorescent dyes, which is applied in the field of reflecting the penetration amount and penetration depth of protective agents in surface-modified cement-based materials, the penetration depth and penetration amount of protective agents, and can solve the problem of insufficient accuracy and the penetration depth test of protective agents The method is cumbersome and other problems, to achieve the effect of comprehensive measurement, short measurement cycle and time saving

Active Publication Date: 2018-06-26
UNIV OF JINAN
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  • Application Information

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Problems solved by technology

[0010] In view of the lack of an effective method for measuring the penetration of the protective agent in the prior art and the cumbersome and insufficient accuracy of the test method for the penetration depth of the protective agent, the present invention provides a method for measuring the penetration depth of the protective agent on the surface of cement-based materials using fluorescent dyes. and penetration method

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  • Method for measuring penetration depth and penetration amount of cement-based material surface protective agent using fluorescent dyes
  • Method for measuring penetration depth and penetration amount of cement-based material surface protective agent using fluorescent dyes

Examples

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Embodiment 1

[0032] The water-cement ratio of the concrete used is 0.6, and the age is 1 year. The concrete has a relatively large pore size, and an obvious fluorescent signal can be detected with a small amount of fluorescent dye and protective agent mixed. The mixture of protective agent and fluorescent dye is defined as the test solution (the same below), the components of the test solution and their mass percentages are: fluorescent dye: 0.005%, protective agent 99.995%, and the fluorescent dye is rhodamine 6G, the protective agent is tetraethyl orthosilicate, and the protective agent and rhodamine 6G form a uniform solution.

[0033] The detection method is as follows: cut a columnar concrete test block with a diameter of 15cm into a columnar test block with a thickness of 2cm, seal the periphery of the test block with epoxy resin and soak it in the prepared test solution for half an hour. Take out the test piece and put it in a drying oven for 24 hours. After the sample is dried, us...

Embodiment 2

[0038] The concrete used has a water-cement ratio of 0.5 and an age of 10 years. The concrete has a long age and a relatively dense material structure. In order to detect the fluorescence spectrum more clearly, a slightly higher content of fluorescent dye is mixed with the protective agent. The components of the test solution in this embodiment and their mass percentages are: fluorescent dye: 0.01%, protective agent: 99.99%, the fluorescent dye is o-chlorophenyl fluorone, and the protective agent is tetraethyl orthosilicate.

[0039] The detection method is the same as in Example 1, except that samples are taken at the surface layer, 1mm, 2mm, 3mm, 4mm, and 5mm depth respectively. It can be seen from the fluorescence results that the penetration depth of the protective agent is 4mm. From the surface layer to 4mm away from the surface layer, the peak intensities of o-chlorophenylfluorone are: 6297.33, 3876.92, 1056.77, 769.72, 254.88, that is, the concentration ratio of ethyl o...

Embodiment 3

[0041] The concrete used has a water-cement ratio of 0.38 and an age of 20 years. The concrete has a small water-cement ratio, a long age, and a very small pore size. In order to detect an obvious fluorescence spectrum, it is necessary to mix a higher content of fluorescent dye with a protective agent. . The components of the test solution in this example and their mass percentages are: fluorescent dye: 0.03%, protective agent: 99.97%, the fluorescent dye is salicyl fluorone, and the protective agent is nano-SiO 2 Sol.

[0042] The detection method is the same as in Example 1, except that samples are taken at 0mm, 1mm, 2mm, 3mm, and 4mm from the surface layer. It can be seen from the fluorescence results that the penetration depth of the protective agent is 3mm. From the surface layer to 3mm away from the surface layer, the peak intensities of salicyl fluorone are: 8634.46, 4826.33, 847.69, 252.45 respectively, that is, the concentration ratio of the protective agent is 8634...

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Abstract

The invention provides a method for determining the infiltration depth and infiltration capacity of a protection agent on the surface of a cement-based material through a fluorescent dye. The method comprises the following steps: mixing the protective agent with the fluorescent dye reaching up to the amount of testing, making a mixture of the fluorescent dye and the protective agent act on the surface of the cement-based material at a certain age, sampling at different depths of the cement-based material, and performing fluorescence spectrum detection on samples, thereby obtaining the infiltration depth and concentration distribution of the fluorescent dye according to a ratio of fluorescence strength, the fluorescent dye and the protective agent, and further obtaining the content of the protective agent in different depth ranges of the samples. The method is simple and feasible, is short in measurement period, low in cost and wide in application range, can be applied to quantitative analysis on the concentration and mass distribution of the protective agent at different infiltration depth parts, and can be used for precisely evaluating the infiltration performance of the protective agent on the surface of the cement-based material and further effectively controlling the exertion of effect of the protective agent in the cement-based material.

Description

technical field [0001] The invention relates to a method for measuring the penetration depth and penetration amount of a protective agent on the surface of a cement-based material by using a fluorescent dye, which is particularly suitable for reflecting the penetration amount and penetration depth of a protective agent in a surface-modified cement-based material, and belongs to the technical field of building materials. Background technique [0002] The dense pore structure of the cement-based surface is of great significance for resisting the invasion of harmful substances in the external environment. The surface layer is the weak link of the cement-based material. The surface layer of the cement-based material is exposed to the environment. It has been subjected to continuous erosion by the external environment for a long time and becomes loose and porous or has cracks. In this way, harmful substances in the external environment will invade the interior of the cement-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N13/04
Inventor 侯鹏坤程新张蕊周宗辉杜鹏张秀芝黄世峰
Owner UNIV OF JINAN
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