JP5569738B2 - Liquid state evaluation method for porous material and liquid state evaluation system for porous material - Google Patents

Description

  The present invention relates to a liquid material state evaluation method for a porous material and a liquid material state evaluation system for a porous material for evaluating the liquid state of a porous material such as concrete or mortar.

  An important factor in the properties of porous materials such as concrete is the density of the material, such as the void volume. Therefore, accurate evaluation of material density is important. In addition to the fineness of the material, the amount and distribution of water filled in the voids, that is, the water content, is one of the items that affect the performance of the material and must be accurately evaluated. .

  Conventionally, the density of concrete has been qualitatively inferred from information such as blending at the time of concrete production. However, even though the hardened concrete structure actually constructed has no problems with the blending of water and cement, deterioration factors (carbon dioxide, salinity, etc.) are expected due to the lack of denseness caused by construction and curing problems. There are many examples of intrusions earlier and causing problems at an early stage. Therefore, quality evaluation regarding the density of concrete is required. Furthermore, when evaluating the density of concrete, since the water content greatly affects, it is required to accurately evaluate the water content in advance. In addition, the moisture content of concrete is a major influencing factor when evaluating various physical property values, and also significantly affects the deterioration of concrete, construction conditions for repair agents, and construction conditions for secondary members such as tiles. It is necessary to evaluate to.

  Conventional techniques for evaluating the density of concrete include a mercury intrusion method, a gas permeability test, a water permeability test, and the like. In these denseness evaluation techniques, it is known that the moisture content of concrete has a great influence on the measured value, and the moisture content of the concrete is adjusted in the measurement at the laboratory level. When it is difficult to adjust the water content due to the evaluation of the actual structure, etc., the water content of the concrete is evaluated.

  A conventional technique for evaluating the moisture content of concrete is a commercially available surface moisture meter. This surface moisture content meter is an instrument applied from the evaluation of the moisture content of wood, and measures the electrical property values such as capacitance and electrical resistance of the material surface and converts them from the weight moisture content experimental results of the specimen. Thus, the moisture content is estimated (see Patent Document 1).

JP-A-8-0945568

  However, it has been empirically known that the surface moisture content meter is greatly affected by the contact state between the electrode part of the device and the concrete surface, and is only treated as a reference value. In concrete, the moisture distribution in the interior differs between the process of water absorption (moisture absorption) and the process of water discharge (moisture release). However, in the above equipment, the moisture content is converted to a simple weight ratio. It is not at all suitable for evaluating concrete of actual structures in an environment where moisture is repeatedly released. For this reason, in some cases, only the electrical resistance value is measured as a reference value in the evaluation of an actual structure regardless of the above-described apparatus. Thus, at present, a technique for accurately evaluating the moisture content of concrete has not been established. In particular, there is still no technology that enables the evaluation that reflects the denseness by examining the denseness of the concrete.

  Therefore, an object of the present invention is to provide a liquid material state evaluation method for a porous material and a liquid material state evaluation system for a porous material that accurately measure the liquid state of the porous material on site.

  Hereinafter, the features of the present invention will be described with reference numerals. Note that the reference numerals are for reference, and the present invention is not limited to the embodiments.

According to the first aspect of the present invention, there is provided a method for evaluating a liquid content of a porous material, wherein a color characteristic of concrete or mortar as a porous material before liquid absorption treatment is measured to determine a reference value. performs liquid absorption process for absorbing liquid, the characteristics of the difference between the porous material by measuring the color characteristics of determining the liquid absorption process value, the liquid absorbing process value and the reference value after the liquid absorption process A value is determined, and a liquid-containing state of the porous material is determined based on the characteristic value.

In the first feature described above, the color characteristic of the porous material is color, the reference value is a reference color value, the liquid absorption treatment value is a liquid absorption treatment color value, and the characteristic value is wherein said reference color value is the difference between the liquid absorption process color value.

The color characteristics of the porous material is glossiness, the reference value is a reference glossiness, the liquid absorbing process value is the liquid absorbing process glossiness, the characteristic value is the liquid absorbing process and the reference glossiness which is the difference between the gloss.

Liquid content state evaluation system of the porous material according to the second aspect of the present invention (10), measures the color characteristics of the porous material before the liquid absorbing process for absorbing the liquid concrete or mortar as a porous material and after both liquid absorption process when determining the reference value the porous measuring device for determining the liquid absorption process values by measuring the color characteristics of the material (11), the reference value and with the liquid absorbing process values based on said characteristic value with determining a characteristic value from the difference with the analyzer (12) for determining the liquid content state of the porous material.

  According to the characteristics of the present invention, the liquid content state can be inspected with respect to the actual structure of the porous material that is nondestructive and can be implemented on site.

It is a block diagram which shows the component of the liquid-containing state evaluation system of the porous material which concerns on embodiment. It is a flowchart which shows the process sequence of the liquid-containing state evaluation method of a porous material. It is a graph which shows the test result of an experimental example, and shows the time-dependent change of the color difference of each measurement color parameter | index. (A) is a graph which shows the time-dependent change of (DELTA) L ^* (lightness) concerning an experimental example, (B) is a graph which shows the time-dependent change of (DELTA) a ^* (green-red) concerning an experimental example. (A) is a graph showing the time-dependent change of b ^* (blue to yellow) according to the experimental example, and (B) is a graph showing the time-dependent change of ΔG (glossiness) related to the experimental example.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  As shown in FIG. 1, the liquid material state evaluation system 10 for a porous material includes a measurement device 11 that measures the porous material, an analysis device 12 that analyzes the measurement result of the porous material, a measurement result, and an analysis result. Is stored, and an output device 14 is provided for outputting the analysis results. Examples of the porous material include concrete, mortar, ceramic inorganic material, organic material, and metal material.

The measuring device 11 determines the reference value by measuring the color characteristics of the porous material before the liquid absorption treatment, and determines the liquid absorption processing value by measuring the color characteristics of the porous material after the liquid absorption treatment. . Here, the liquid absorption treatment is to apply and absorb a liquid (water, colored water, component-containing water, organic solvent) on the surface of the porous material. The color characteristics are color (lightness, green to red, blue to yellow), and gloss. The measuring device 11 is, for example, a colorimeter, a color difference meter, or a gloss meter. The colorimeter and color difference meter spectroscopically reflect the reflected light of the porous material, for example, L ^* a ^* b ^* color system (L ^* : lightness, a ^* : green to red, b ^* : blue to yellow). Determine each color value. A colorimeter or the like measures a reference color value of the porous material before the liquid absorption treatment and a liquid absorption treatment color value after the liquid absorption treatment. The gloss meter causes a light beam to be incident on a sample at a predetermined incident angle, and measures a light beam having a specified opening angle reflected in the specular reflection direction with a light receiver. The gloss meter measures the reference glossiness of the porous material before the liquid absorption treatment and the liquid absorption treatment glossiness after the liquid absorption treatment.

  The analysis device 12 includes a CPU (Central Processing Unit) that processes data according to a processing program, a ROM (Read Only Memory) that stores the processing program, and a RAM (Random Access) that temporarily stores data necessary for the processing of the CPU. Memory). The analyzer 12 determines the characteristic value from the difference between the reference value of the porous material before the liquid absorption process and the liquid absorption value after the liquid absorption process. Moreover, the analyzer 12 determines the liquid-containing state of the porous material based on the characteristic value. Here, the relationship between the characteristic value and the liquid-containing state of the porous material is determined in advance. That is, the threshold value of the characteristic value related to the liquid content of the porous material is obtained in advance. The liquid-containing state is represented by, for example, liquid content (%) = (weight of the porous material containing liquid−weight of the dried porous material) / (weight of the dried porous material). In addition, the liquid-containing state may be indicated, for example, in 10 stages from a dry state to a wet state.

  In the case of color, the analyzer 12 determines a color difference (characteristic value) as a difference between the reference color value and the identification processing color value, and determines the liquid-containing state of the porous material based on the color difference. In the case of the glossiness, the analyzer 12 determines a color difference (characteristic value) as a difference between the reference glossiness before the liquid absorption treatment and the liquid absorption treatment glossiness after the liquid absorption treatment, and the porous material is determined based on the color difference. Determine the liquid state.

  The storage device 13 uses, for example, a hard disk, CD, DVD, or USB memory. The storage device 13 stores the reference color value, the liquid absorption treatment color value, the reference glossiness, the liquid absorption treatment glossiness, the characteristic value, and the liquid content state of the porous material of the measurement device 11.

  The output device 14 includes, for example, an image display device such as a liquid crystal display device, an organic EL (Electro-Luminescence) display device, and an inkjet printer type or laser printer type printing device. The output device 14 outputs and displays the characteristic value as the analysis result and the liquid-containing state of the porous material.

  Next, a method for evaluating the liquid content of the porous material will be described.

  As shown in FIG. 2, the porous material is surface-treated (step S11). That is, dirt on the surface of the porous material is removed, and polishing is performed to be smooth as necessary.

  The measurement device 11 is used to measure the characteristics of the porous material before the liquid absorption treatment to determine the reference value, and the reference value is stored in the storage device 13 (step S12). In the case of color, the color measurement device measures the surface of the porous material before the liquid absorption treatment to determine the reference color value. In the case of the glossiness, the glossiness meter determines the reference glossiness by measuring the glossiness of the porous material before the liquid absorption treatment.

  Liquid is absorbed into the porous material (step S13). The liquid is, for example, water, colored water, colored powder, or an organic solvent.

  The color characteristic of the porous material after the liquid absorption treatment is measured using the measuring device 11 to determine the liquid absorption treatment value, and the liquid absorption treatment value is stored in the storage device 13 (step S14). In the case of color, the colorimeter and color difference meter measure the color of the surface of the porous material after the liquid absorption treatment to determine the liquid absorption treatment color value. In the case of glossiness, the gloss meter measures the glossiness of the surface of the porous material after the liquid absorption treatment to determine the liquid absorption treatment glossiness.

  The analyzer 12 compares the reference value of the porous material with the liquid absorption treatment value, and determines the characteristic value from the difference between the reference value and the liquid absorption treatment value (step S15). In the case of color, the analyzer 12 determines the color difference as the characteristic value from the difference between the reference color value and the liquid absorption color value. In the case of glossiness, the analyzer 12 determines the color difference as a characteristic value from the difference between the reference glossiness and the liquid absorption glossiness.

  The analyzer 12 determines the liquid-containing state of the porous material based on the characteristic value (Step S16). In the case of color, the analyzer 12 determines the liquid-containing state of the porous material based on the relationship between the color difference (characteristic value) obtained in advance and the liquid-containing state. In the case of glossiness, the analyzer 12 determines the liquid-containing state of the porous material based on the relationship between the color difference (characteristic value) obtained in advance and the liquid-containing state. The liquid state of the porous material is evaluated without damaging the porous material by such a procedure.

  According to the above embodiment, a liquid-containing state can be evaluated with respect to the actual structure of a porous material non-destructively in the field.

  In addition, the moisture content of the porous material of the actual structure can be evaluated quickly and easily without causing damage.

  Colorimeters, color difference meters, and gloss meters are measuring instruments that do not require specialized knowledge in handling, so anyone can easily perform work.

  Since the measurement device uses a portable handy type, the handling effort is small and no dedicated device is required.

  Furthermore, when applied to the site, the liquid content of the surface layer of the porous material can be evaluated. In the case of laboratory tests on samples collected on site, the liquid content distribution inside the porous material is evaluated. can do.

  In addition, this invention is not limited to this embodiment, Moreover, each embodiment can be changed and corrected in the range which does not change the meaning of invention.

Experimental Example The moisture content of concrete as a porous material was evaluated.

(1) Specimen Two types of concrete having a water / cement ratio (hereinafter referred to as W / C) of 0.4 and 0.7 were used. Each concrete was aged for several years. The concrete was dried indoors until the weight change was almost constant.

(2) Test method Concrete was subjected to a water absorption treatment using pure water as an infiltrating material. Specifically, pure water was sprayed on the concrete placement side by spraying. The number of spraying was 10 times (the amount of spraying at one time was about 0.8 g).

As a measuring instrument, a color difference meter and a gloss meter were used. As the measurement index, L ^* (lightness), a ^* (green to red), b ^* (blue to yellow), YI (yellowness) color value, and Gloss (glossiness) were used. The measurement site was the concrete placement side.

  As the measurement time, an initial value before the water absorption treatment and a change with time after the water absorption treatment were measured. The measurement interval was 10 seconds to 10 minutes, and was appropriately selected according to the situation. Moreover, the water film on the concrete surface was wiped off at 3 to 4 minutes after spraying.

  The initial values before the water absorption treatment were used as the reference color value and the reference glossiness, and the measured values after the water absorption treatment were used as the water absorption treatment color value and the water absorption treatment glossiness. The difference between the reference color value and the water absorption treatment color value, the difference between the reference glossiness and the water absorption treatment glossiness, that is, the color difference was evaluated.

(3) Test Results FIG. 3 is a graph comparing the measured values for concrete with W / C = 0.7. At 30 seconds after watering, the color differences of L ^* (lightness), YI (yellowness), and G (glossiness) were large. On the other hand, the color difference between a ^* and b ^* was small. In addition, although the color difference of the concrete of W / C = 0.4 was halved with respect to the concrete of W / C = 0.7, the same tendency was shown. From the above, it is determined that L ^* , YI, and G are effective as determination indexes.

4 (A) and 4 (B) show changes over time in ΔL ^* (lightness color difference) after water absorption treatment for each concrete with W / C = 0.4 and 0.7. In FIGS. 4A and 4B, the vertical axis indicates ΔL ^* , and the horizontal axis indicates time (seconds). None of the concrete showed a change in L ^{* in} the wetting stage immediately after spraying. FIG. 5A shows data for 5 minutes immediately after spraying. The numerical fluctuation amount of the concrete with W / C = 0.7 was about 1.5 times that of the concrete with W / C = 0.4. After wiping off the water film (180 seconds to 240 seconds), the rise of ΔL ^{* in} all the concretes began. The amount of change in the concrete with W / C = 0.4 decreased with time. The change of the concrete with W / C = 0.7 showed a gradual decrease behavior. ΔL ^{* of} any concrete gradually approached 0 after a certain period of time (about 3000 seconds), that is, L ^* approached the initial value.

FIGS. 4C and 4D show changes with time of Δa ^* (color difference of a ^* ) after water absorption treatment for concrete with W / C = 0.4 and 0.7. Due to the low sensitivity, the influence of instrument errors was great. The numerical fluctuation amount of the concrete with W / C = 0.7 was about twice as much as the numerical fluctuation of the concrete with W / C = 0.4. Δa ^* of both concretes exceeded the initial value after a predetermined time, and shifted to the green side.

FIGS. 5A and 5B show changes with time of Δb ^* (color difference of Δb) after water absorption treatment for concrete with W / C = 0.4 and 0.7. In the concrete of W / C = 0.7, there was a reaction in a wet state (between 0 and 300 seconds). The numerical fluctuation amount of the concrete with W / C = 0.7 was about 1.5 times that of the concrete with W / C = 0.4. The Δb ^* of the concrete with W / C = 0.7 exceeded the initial value after about 4000 seconds and shifted to the blue side.

  FIGS. 5C and 5D show changes with time of ΔG (ΔG color difference) after water absorption treatment for concrete with W / C = 0.4 and 0.7. The ΔG of both concretes changed greatly in the wetting stage (0 to about 300 seconds) immediately after spraying, and the change was almost completed after about 300 seconds. The numerical fluctuations of both concretes showed slightly different behavior. The amount of increase in value was the same regardless of the water / cement ratio. ΔG of both concretes did not decrease to 0 during the measurement time, and G did not return to the initial value. The residual amount of concrete with W / C = 0.4 was slightly larger than the residual amount of concrete with W / C = 0.7.

DESCRIPTION OF SYMBOLS 10 Liquid-containing evaluation system of porous material 11 Measuring apparatus 12 Analyzer 13 Storage device 14 Output device

Claims (4)

Determine the reference value by measuring the color characteristics of concrete or mortar as a porous material before liquid absorption treatment,
It performs liquid absorption process to absorb liquid into the porous material,
The color characteristics of the porous material after liquid absorption process was measured to determine the liquid absorption process values,
Determining the characteristic value of the difference between the liquid absorbing process value and the reference value,
Determining a liquid-containing state of the porous material based on the characteristic value;
Method for evaluating the liquid content of a porous material. The color characteristic of the porous material is color,
The reference value is a reference color value;
The liquid absorption treatment value is a liquid absorption treatment color value,
The characteristic value is the difference between the liquid absorbing process color value and the reference color values,
The method for evaluating a liquid content of a porous material according to claim 1. The color characteristic of the porous material is glossiness,
The reference value is a reference glossiness,
The liquid absorption treatment value is the liquid absorption treatment glossiness,
The characteristic value is the difference between the liquid absorbing process glossiness and the reference glossiness,
The method for evaluating a liquid content of a porous material according to claim 1. Measuring the color characteristics of the porous material after both liquid absorption process when determining the reference value by measuring the color characteristics of the concrete or the porous material before the liquid absorbing process for absorbing liquid mortar as a porous material A measuring device for determining the liquid absorption treatment value;
And a spectrometer for determining the liquid content state of the porous material on the basis of the characteristic value with determining a characteristic value from a difference between said liquid absorbing process value and the reference value,
Liquid content evaluation system for porous materials.