JP7344849B2 - Durability evaluation method and durability evaluation device of waterproof coating film - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Architectural Institute of Japan Conference Academic Lecture Abstracts (Hokuriku) September 2019, pp. 1295-1296

The present invention relates to a method and device for evaluating the durability of waterproof coatings, and particularly to a method and device for evaluating the durability of waterproof coatings formed on buildings in real environments.

In buildings, in order to prevent water leakage from joints and cracks in concrete frames, waterproofing has conventionally been achieved by applying a waterproof coating to the surface of the building. However, even when a waterproof coating film is applied, there is a problem in that the waterproof coating film directly above the joints or cracks is repeatedly deformed due to expansion and contraction changes in the joints and cracks, resulting in cracks in the waterproof coating film. Therefore, waterproof coatings have a significant impact on the lifespan of buildings, and are required to have sufficient extensibility and mechanical strength, as well as accurate evaluation of the durability of waterproof coatings in evaluating the lifespan of buildings. are required to do so.

As a method for evaluating paint films, Non-Patent Document 1 states that waterproof paint films mainly used for waterproofing work on roofs and outer walls of reinforced concrete buildings are evaluated by mechanical properties such as elongation rate and breaking strength in a tensile test. It is stated that. Furthermore, Non-Patent Document 2 describes that surface covering materials used for repairing concrete structures are evaluated by a crack followability test method. Here, the crack followability refers to the ability of the surface covering material to ensure coverage regardless of cracks in the concrete due to its extensibility.

The coating film evaluation methods described in Non-Patent Document 1 and Non-Patent Document 2 above mainly evaluate mechanical properties using a single tensile load, whereas fatigue durability is evaluated by applying repeated loads. It has also been done. Non-Patent Document 3 states that in response to the problem of roof waterproofing materials in which the coating material fatigues and breaks due to the movement of the discontinuous part of the base plate, the sheet material of the coating is broken at the discontinuous part in the center of the base plate. The test specimen, which is glued or coated with the top side facing upwards, is placed in a fatigue testing device and given repeated movements (movement) to test the fatigue resistance of the cured product (coating film) of the sheet-like material or the liquid material used by coating. It contains specifications for test methods for evaluating resistance. Furthermore, Non-Patent Document 4 describes a fatigue test method for evaluating resistance to movement of cracks generated at the joints of the waterproof layer base or the base.

JIS A 6021:2011 “Waterproof coating materials for construction” (Japan Standards Association) JSCE-K532-1999 “Concrete Standard Specification [Standard Edition]” established in 2007 (Japan Society of Civil Engineers) JIS A 1436 “Fatigue resistance test method for discontinuous base materials of architectural coating materials” (Japanese Standards Association) JASS8 T-501 Performance evaluation test method for membrane waterproofing materials 3.3 Fatigue test (Architectural work standard specifications/commentary, Waterproofing work, Architectural Institute of Japan)

The coating film evaluation methods described in Non-Patent Documents 1 to 4 above attempt to evaluate the durability of the coating film from mechanical properties such as strength, extensibility, and resistance to fatigue. In both of these methods, the relationship between test conditions such as temperature and load and the actual environment is not clear, so they cannot evaluate the durability of waterproof coatings formed on buildings in the actual environment where various factors are involved. do not have. However, actual buildings are in different environments, and the durability (lifespan) of paint films formed on buildings differs even for the same type of paint film due to the influence of the environment. Therefore, conventional evaluation methods have not been able to accurately evaluate the durability of waterproof coatings formed on actual buildings.

An object of the present invention is to provide a durability evaluation method and a durability evaluation device for evaluating the durability of a waterproof coating film formed on a building in a real environment for each environment.

In order to solve the above-mentioned problems, the durability evaluation method of a waterproof coating film of the present invention is a method for evaluating the durability of a waterproof coating film formed on a specific building, which comprises: Step 1: determining the fluctuation range at which the waterproof coating film breaks under one load through a test, and determining the fluctuation range and the number of times the waterproof coating will break under a predetermined repeated load through a fatigue test of the waterproof coating film. Based on the results obtained in Step 1 and Step 2, create an SN diagram for the relationship between the fluctuation range and the number of breaks, including the case where the number of breaks is one. Step 3: S-- Step 4: from the N diagram, calculate the number of breaks Ni for the predetermined fluctuation range leading to breakage, and use the following equation (1) to calculate the estimated durability Y of the waterproof coating film formed on the specific building; The present invention is characterized by being a durability evaluation method of a waterproof coating film. Hereinafter, the above method for evaluating the durability of a waterproof coating film will be referred to as the evaluation method of the first invention.
[Number 1]

Y=1/(Σni/Ni) ...Formula (1)

The evaluation method of the first invention is such that the waterproof coating film formed on the specific building is broken if it is subjected to Ni times of movement over a period of one year under the actual environment of the location where the specific building is currently being constructed. It is taken into consideration that the load is subjected to a load having a predetermined fluctuation range ni times (i=1, 2, 3, . . . ). Therefore, the durability (durability) of a paint film is not simply evaluated through laboratory experiments, but rather the durability (durability) of a waterproof paint film formed on a specific building under the actual environment. It is an evaluation method that can obtain accurate evaluation results that cannot be obtained with conventional evaluation methods.

Furthermore, in the evaluation method of the first invention described above, the SN diagram regarding the relationship between the fluctuation range and the number of breaks includes data when the number of breaks is one. In normal fatigue fracture tests of mechanical devices and instruments, it is not assumed that a load so large as to cause a fracture will be applied once, so if the number of fractures is one in the S-N diagram. There is no point in including this data. However, it is natural for buildings to be subjected to large loads such as earthquakes, typhoons, floods, etc. in the natural environment that can cause paint films to break in one to several loads. Therefore, it can be said that accurate data is also important when the coating film is subjected to such a large load that it breaks after one to several loads. Therefore, in the above evaluation method of the present invention, in Step 1, the range of variation in which the waterproof coating film breaks under one load is determined by a crack followability test of the waterproof coating film, and this data is used in the S-N diagram. This can be said to be a matter specific to coatings formed on buildings that are subjected to loads in the natural environment.

Next, in another aspect of the present invention, there is a method for evaluating the durability of a waterproof coating film formed on a specific building, which uses coating pieces of the waterproof coating film. From the graph of the storage modulus E' of temperature dispersion for each measurement frequency obtained by dynamic viscoelasticity measurements at multiple measurement frequencies, a reference temperature is set and the storage modulus E' of frequency dispersion is calculated. Step 1' of creating a graph of the storage elastic modulus E' of the frequency dispersion, and a graph of the relationship between the storage elastic modulus E' and the range of variation at which the waterproof coating film ruptures when subjected to one load. , and a step 2' of creating a graph of the relationship between the storage modulus E' and the number of times of rupture when subjected to repeated loading of a predetermined fluctuation range, and From the graph of the relationship between the fluctuation width at which the waterproof coating film ruptures and the graph of the relationship between the storage modulus E' and the number of fractures that occur when subjected to a repeated load of a predetermined fluctuation range, it is possible to determine the fluctuation width and the rupture. Step 3' of creating an S-N diagram regarding the relationship with the number of times, and the waterproof coating film formed on the specific building receives a load of a predetermined fluctuation range from the movement of the specific building over a period of ni times. When the number of fractures Ni is determined to occur in the specific building, the number of fractures Ni for the predetermined variation range is determined from the SN diagram determined in step 3', and the number of fractures Ni that will occur in the specific building is calculated using the formula (1) above. step 4' of determining the estimated durability Y of the waterproof coating film. Hereinafter, this waterproof coating film durability evaluation method will be referred to as the evaluation method of the second invention.

According to the evaluation method of the second invention, if the dynamic viscoelasticity of the coating film is measured in step 1, the durability ( durability). More specifically, without conducting a crack followability test or a fatigue test for each coating film evaluation, the value of the storage modulus E' obtained by dynamic viscoelasticity measurement for the same resin material, An SN diagram can be created using the information derived from data conversion (crack tracking width, number of fatigue fractures). After creating the SN diagram, the estimated durability Y can be determined in exactly the same manner as the above-mentioned method for evaluating the durability of waterproof coatings. That is, from the SN diagram, find the number of breaks Ni for a predetermined fluctuation range, and use the above formula (1) to find the estimated durability Y of the waterproof coating film formed on the specific building. Can be done.

Therefore, like the above-mentioned evaluation method, the evaluation method of this second invention does not simply evaluate the durability (durability) of a paint film through laboratory experiments, but rather This method evaluates the durability (durability period) of waterproof coating films under real environments, and it is possible to obtain accurate evaluation results that cannot be obtained with conventional evaluation methods. It is possible to more easily evaluate the durability (duration of life) of a paint film without having to perform a crack followability test or a fatigue test for each paint film evaluation.

Next, in the present invention, an evaluation device for implementing the evaluation method of the first invention and the evaluation method of the second invention described above is also specified. By specifying not only the evaluation method but also the evaluation device, the configuration of the evaluation device for implementing the evaluation method becomes clear, and it can be said that its feasibility is further improved.

In the present invention, an evaluation device that implements the evaluation method of the first invention is an evaluation device for the durability of a waterproof coating film formed on a specific building, and the evaluation device is an evaluation device for evaluating the durability of a waterproof coating film formed on a specific building. Further, a rupture fluctuation width data acquisition unit that acquires data on a fluctuation width at which the waterproof coating film ruptures when subjected to a single load, a fluctuation width obtained by a fatigue test of the waterproof coating film, and a predetermined repeated load. a repeated load-failure frequency relationship data acquisition unit that acquires data on the number of times the waterproof coating ruptures when subjected to a single load, and a fluctuation range at which the waterproof coating film ruptures when subjected to one load, which is acquired by the rupture fluctuation width data acquisition unit; Based on the data on the number of fractures resulting in fracture under a predetermined repeated load, which is acquired by the repeated load-number of fracture relationship data acquisition unit, the fluctuation range and the number of fractures, including the case where the number of fractures is one, are determined. An SN diagram creation unit that creates an SN diagram regarding the relationship between the number of failures and the waterproof coating film formed on the specific building, and a waterproof coating film formed on the specific building, When the load is applied ni times, from the SN diagram created by the SN diagram creation section, find the number of breaks Ni for the predetermined fluctuation range, and use the equation (1) above to calculate the number of breaks Ni. and an estimated durability calculation unit that calculates an estimated durability Y of a waterproof coating film formed on the specific building.

In the present invention, an evaluation device that implements the evaluation method of the second invention is an evaluation device for the durability of a waterproof coating film formed on a specific building, and is an evaluation device for evaluating the durability of a waterproof coating film formed on a specific building. From the graph of the storage modulus E' of temperature dispersion for each measurement frequency obtained by dynamic viscoelasticity measurements at multiple measurement frequencies, we set the reference temperature and created a graph of the storage modulus E' of frequency dispersion. From the graph of the frequency dispersion storage modulus E' created by the frequency dispersion storage modulus E' graph creation section and the frequency dispersion storage modulus created by the frequency dispersion storage modulus E' graph creation section, the storage modulus E' and the storage modulus under one load are calculated. and a graph of the relationship between the storage elastic modulus E' and the number of times the waterproof coating breaks when subjected to a repeated load of a predetermined variation range. E'-fluctuation range relationship graph and storage elastic modulus E'-fluctuation frequency relationship graph creation unit; storage elastic modulus E'-fluctuation width relationship graph and storage elastic modulus E'-fluctuation frequency relationship graph for the fluctuation width; A graph of the relationship between the storage elastic modulus E' and the variation range at which the waterproof coating film breaks after receiving one load, and a graph of the relationship between the storage elastic modulus E' and the repeated load of the predetermined variation range, created by the production department. an S-N diagram creation unit that creates an S-N diagram regarding the relationship between the fluctuation width and the number of fractures from a graph of the relationship between the number of fractures that occur and the number of fractures that occur, and a waterproof coating film formed on the specific building; is subjected to a load with a predetermined fluctuation range ni times from the movement of one year in the specific building, and from the SN diagram created by the SN diagram creation department, for the predetermined fluctuation range, The evaluation device includes an estimated durable life calculation unit that calculates the number of breaks Ni that lead to breakage and calculates the estimated durable years Y of the waterproof coating film formed on the specific building using the above equation (1).

The evaluation method and evaluation device of the present invention are a method and device for evaluating the durability of a waterproof coating film formed on a building in a real environment. However, if the environment (location) in which a building is constructed is known, it can be applied by knowing the movement of that environment over a one-year period.

In this way, the present invention does not simply evaluate the durability (durability) of a paint film through laboratory experiments, but rather evaluates the durability of a waterproof paint film formed on a specific building in the actual environment. This method evaluates the durability (durability) and has the effect of being able to obtain accurate evaluation results that cannot be obtained with conventional evaluation methods. In particular, in the evaluation method of the first invention, it is natural for buildings to be subjected to large loads such as earthquakes, typhoons, floods, etc. in the natural environment that can cause paint films to break in one to several loads. be able to respond to the natural environment available. Furthermore, in the evaluation method of the second invention, the durability (durability period) of the paint film can be evaluated more easily without conducting a crack followability test or a fatigue test for each paint film evaluation. Furthermore, by specifying not only the evaluation method but also the evaluation device, the configuration of the evaluation device for implementing the evaluation method becomes clear, and it can be said that its feasibility is further improved.

FIG. 3 is a diagram showing the form of a painted specimen used in a crack followability test and a fatigue test. It is an SN diagram of JIS A 6909 waterproof multi-layer coating material E. It is an SN diagram of JIS A 6021 acrylic rubber system. It is a graph of storage elastic modulus E' of temperature dispersion for each measurement frequency. It is a graph of a curve (master curve) of storage elastic modulus E' of frequency dispersion. It is a graph in which the horizontal axis represents storage modulus E' and the vertical axis represents crack followability. It is a graph in which the horizontal axis is the storage modulus E' and the vertical axis is the number of breaks with respect to the fluctuation range. 2 is a flow diagram showing the flow of the evaluation method of Example 1. FIG. 3 is a flow diagram showing the flow of an evaluation method in Example 2. FIG. 2 is a functional block diagram showing functional blocks of the evaluation device of Example 1. FIG. FIG. 2 is a functional block diagram showing functional blocks of an evaluation device according to a second embodiment.

Hereinafter, the evaluation method of Example 1 of the first invention and Example 2 of the second invention of the present invention will be described in detail.

First, Example 1 will be described based on experimental examples of a crack followability test and a fatigue test.
(painting material)
Table 1 shows the types of test specimens used in the evaluation and the level of variation in fatigue tests. Two types of coatings were targeted: waterproof multi-layer coating material E according to JIS A 6909 and acrylic rubber-based coating according to JIS A 6021.

(Test specimen)
Figure 1 shows the shape of the specimen used in the crack followability test and fatigue test. A test specimen was prepared by applying the main material smoothly to a film thickness of 1 mm on a flexible board (200 x 80 x 4 mm) specified in JIS A 5430.

(Crack followability test)
This is a test related to step 1 of the first invention.
After the test specimen shown in FIG. 1 was cured indoors, a crack was made in the flexible board along the notch in the center of the flexible board without breaking the coating. Both ends of the test piece were pulled at 1 mm/min in a direction perpendicular to the crack using a universal testing machine, and the amount of elongation when a pinhole appeared in the coating was recorded.

(Fatigue test)
This is a test related to step 2 of the first invention.
The test was conducted using a JASS8 fatigue testing machine. The test piece was cured in the same way as the crack followability test, and a crack was made in the flexible board. Multiple levels of variation were set for the fatigue test. Repeated fatigue was carried out at regular intervals, and the number of repetitions at the point when a pinhole appeared in the coating film and the number of repetitions at the point at which the coating film broke were recorded. In Example 1, testing was carried out at the level of fluctuation range shown in Table 1 at a cycle of 1 time/min.

(Experimental results of crack followability test)
These are the test results regarding step 1 of the first invention.
Table 2 shows the results of the crack followability test for each specimen. This result was defined as the variation range in which the coating film was broken after receiving one load.

(Fatigue test results)
These are the test results regarding step 2 of the first invention.
Table 3 shows the number of repetitions at which pinholes were formed in the coating film. This result was defined as the relationship between the fluctuation range and the number of times the specimen would break under repeated loads of a predetermined fluctuation range.

(Create a relationship diagram (S-N diagram) between fluctuation range and number of fluctuations)
This is a graph creation process related to step 3 of the first invention.
Based on the data obtained from the results of the crack followability test and the data obtained from the experimental results of the fatigue test, an S-N diagram of the relationship between the fluctuation range and the number of fractures, including the case where the number of fractures is one, was created. It was created. Figure 2 shows the JIS A 6909 waterproof multi-layer coating material E, and Figure 3 shows the JIS A 6021 acrylic rubber SN diagram.

(linear cumulative damage law)
This is a law regarding step 4 of the first invention.
The linear cumulative damage law states that if a material undergoes fatigue failure after being subjected to a certain stress range (load with a variable range) N times, then if it is subjected to that stress range once, its life will be lost by 1/N, and N/N = This is a theory based on experience that it will break when it reaches 1, and is used to evaluate fatigue deterioration of materials and adhesives. In the present invention, the stress width (fluctuation width and number of fluctuations) is the expansion and contraction fluctuation of joints and cracks under the actual environment of the location where a specific building is currently being constructed.

(Calculation of durability life)
This is calculation processing related to step 4 of the first invention.
Here, from one year's movement under the actual environment of the location where the specific building is currently being constructed, a load with a predetermined fluctuation range that will break if the waterproof coating formed on the specific building is subjected to Ni times is calculated. Assuming that the specific building is exposed to ni times (i=1, 2, 3...), the lifespan lost in one year is Σni/Ni (i=1, 2, 3...) becomes. Then, it can be seen that the lifespan Y of the waterproof coating film formed on the specific building is determined by the following equation (1).
[Number 2]

Y=1/(Σni/Ni) ...Formula (1)

(annual movement)
This is an item related to step 4 of the first invention.
Note that, from equation (1), in order to determine the lifespan Y of the waterproof coating film formed on the specific building, annual movement data of the specific building is required. The annual movement is assumed to be movement in the cracks of the RC frame, and is obtained from a survey of past literature and measurements by sensing the cracks in actual buildings. A survey of existing literature has shown that, for example, it is possible to obtain the daily fluctuation range due to temperature contraction caused by changes in outside temperature, and it is possible to estimate the annual movement from 365 days' worth of data. Annual movement can be estimated from past weather information by referring to drying shrinkage rate, linear expansion coefficient, etc. Furthermore, by using measurement data obtained by sensing cracks in buildings, it is possible to estimate the remaining lifespan of the movement from its history.

In the first invention, the SN diagram regarding the relationship between the fluctuation width and the number of breaks includes data when the number of breaks is one. In normal fatigue fracture tests of mechanical devices and instruments, it is not assumed that a load so large as to cause a fracture will be applied once, so if the number of fractures is one in the S-N diagram. There is no point in including this data. However, in the natural environment, buildings can be subjected to large loads such as earthquakes, typhoons, floods, etc. that can cause the paint film to break in one to several loads, so based on past data, the probability of this happening is data must be included. Therefore, it can be said that accurate data is also important when the coating film is subjected to such a large load that it breaks after one to several loads.

Next, Example 2 will be explained with a focus on its concept. In Example 1, the waterproof coating film formed on the specific building is determined to have a predetermined fluctuation range that will break after being subjected to Ni times of movement over a period of one year under the actual environment of the location where the specific building is currently being constructed. By taking into account that the load is applied ni times (i = 1, 2, 3...), we can estimate the durability (durability) of the waterproof coating film formed on a specific building under the actual environment. ), and it is possible to obtain accurate evaluation results regarding the durability (durability) of paint films formed on buildings, which cannot be obtained using conventional evaluation methods. However, in the evaluation method of Example 1, when evaluating the durability of individual paint films, it is necessary to perform crack followability and fatigue tests each time, and for each test of the paint film, preparation of the base plate, undercoat, Inspections (tests) such as painting, drying, and pre-test preparation are time-consuming, and fatigue tests in particular require a long period of time to collect data for each variation range.

The present inventors have developed an evaluation method for Example 2 to omit the above inspection (test) effort in Example 1 and to obtain evaluation results equivalent to those of Example 1 with a simpler test. did. The outline of the evaluation method in Example 2 is to perform dynamic viscoelasticity measurement (DMA) using a sample of a minute piece of paint film, and use the storage modulus E' obtained from the dynamic viscoelasticity of the piece of paint film. , data conversion is performed to create an SN diagram showing the relationship between the fluctuation width and the number of breaks. After creating the SN diagram, use the same method as in Example 1 to calculate the durability of the paint film formed on the building.

First, the above-mentioned dynamic viscoelasticity measurement (DMA) will be explained. Dynamic mechanical analysis (DMA) is a test that measures the mechanical properties of a sample by applying strain or stress that changes over time (vibration) to the sample and measuring the resulting stress or strain. It's a method.

(Dynamic viscoelasticity measurement test and results)
These are tests and test results regarding step 1' of the second invention.
Next, the dynamic viscoelasticity test conducted for Example 2 and the test results will be explained. Table 4 shows the types of test specimens used in Example 2. The test specimen uses a coating film in which the material is applied smoothly onto an easily peelable base such as release paper so that the dry film thickness is 1 mm. After the specimen was cured indoors, it was cut into small samples with a thickness of 1 mm, a length of 25 to 45 mm, and a width of 5 to 10 mm. The dynamic viscoelasticity is measured from -100°C to 100°C at a temperature increase rate of 2°C/min at a measurement frequency of , 10Hz. The results are shown in Figure 4. FIG. 4 is a graph of the storage modulus E' of temperature dispersion for each measurement frequency.

(Creating a master curve)
This is data processing and graph creation regarding step 1' of the second invention.
Next, the graph of the storage modulus E' of temperature dispersion for each measurement frequency in FIG. 4 is converted into a graph of a curve (master curve) showing the relationship between the storage modulus E' of frequency dispersion. This conversion is derived using the WLF (Williams-Landel-Ferry) equation and by setting a predetermined reference temperature. Since this WLF formula is a well-known empirical formula related to the principle of time-temperature superposition, detailed explanation will be omitted here. FIG. 5 shows the master curve converted from FIG. 4.

(Calibration curve of fluctuation range and number of fluctuations)
This is data processing and graph creation regarding step 2' of the second invention.
Here, using a tensile speed of 1 mm/min for the crack followability test as a test condition, a calibration curve of the crack followability (fluctuation range) against the storage modulus E' and the number of breaks against the fluctuation range is created. From the results of the crack followability test, "1/(time sec required to break)=frequency" is calculated for each test piece. Calibration curve of crack followability (fluctuation width) against storage elastic modulus E' at the frequency calculated for each test specimen, and calibration of the number of fractures in a predetermined fluctuation range against storage elastic modulus E' at 1 time/min = 0.0167 Hz. Create a line. A calibration curve of the number of breaks versus the storage modulus E' at 1 time/min = 0.0167 Hz is created for each variation range. In this way, based on the storage modulus E' obtained from the dynamic viscoelasticity measurement, we estimated the crack followability of the waterproof coating film and the number of fractures for a predetermined fluctuation range in the fatigue test. Obtain the calibration curve shown in .

(S-N diagram creation)
This is a graph creation process related to step 3' of the second invention.
FIG. 6 is a graph in which the horizontal axis is the storage modulus E' and the vertical axis is the crack followability, and FIG. 7 is a graph in which the horizontal axis is the storage modulus E' and the vertical axis is the number of fractures with respect to the fluctuation range. It is a graph. Since both graphs have a common storage modulus E' on the horizontal axis, we created a graph of the number of fractures (number of fluctuations, horizontal axis) and crack followability (width of fluctuation, vertical axis) based on Figures 6 and 7. In other words, an SN diagram can be created. To summarize the steps so far, (1) dynamic viscoelasticity measurement, (2) creating a graph of the elastic storage modulus E' of temperature dispersion (horizontal axis: temperature) for each measurement frequency, (3) frequency dispersion (horizontal axis: (4) Create a graph (master curve) of the elastic storage modulus E' for (frequency), (4) Create a graph where the horizontal axis is the storage modulus E' and the vertical axis is the crack followability, and the horizontal axis is the storage modulus E'. Create a graph with the vertical axis representing the number of breaks versus the fluctuation range, and (5) create an SN diagram. That is, except for (1) dynamic viscoelasticity measurement, all graphs can be created by data conversion. (1) Considering that the dynamic viscoelasticity measurement is a simpler test than the crack followability test and fatigue durability test conducted in Example 1, Example 2 is more effective than Example 1. Therefore, it can be said that this is a method that can obtain an SN diagram extremely easily.

(Calculation of durability life)
This is a calculation process related to step 4' of the second invention.
After obtaining the SN diagram, the method for calculating the durability of the paint film formed on the building is the same as the method in Example 1. In other words, from one year's movement under the actual environment of the location where the specific building is currently being constructed, the waterproof coating film formed on the specific building will be subject to a load with a predetermined fluctuation range that will break if it is subjected to Ni times. (i = 1, 2, 3...), use the SN diagram to read the number of failures for a load of a certain fluctuation range, and use the linear cumulative damage law to calculate The life span of the waterproof coating film formed on the specific building lost per year is Σni/Ni (i=1, 2, 3...). Then, the lifespan Y of the waterproof coating film formed on the specific building is determined by the following equation (1).
[Number 3]

Y=1/(Σni/Ni) ...Formula (1)

In Examples 1 and 2, coating film samples containing acrylic rubber as a main component were used. This is because acrylic rubber-based waterproof coatings are currently mainstream, and many products specified by JIS A 6909 and JIS A 6021 have acrylic rubber as their main component. However, the same methodology can be applied to urethane resin coatings other than acrylic rubber coatings, regardless of the type of coating material.

Next, FIG. 8 is a flowchart showing a schematic flow of the evaluation method of Example 1, and FIG. 9 is a flowchart showing a schematic flow of the evaluation method of Example 2. As shown in FIG. 8, the evaluation method of Example 1 includes a crack followability test (step S1), a fatigue test (step S2), and an SN diagram creation (step S3) that includes the case where the number of fractures is one. and calculating the estimated durability Y of the waterproof coating film formed on the building (step S4). In order to correspond to this, the evaluation method of Example 2 shown in FIG. Creation of a relationship graph, a relationship graph between the storage elastic modulus E' and the number of ruptures with respect to the fluctuation range (step S2'), creation of an SN diagram (step S3'), and estimated durability Y of the waterproof coating film formed on the building (step S4'). As can be seen from the comparison, in the evaluation method of Example 1, step S1 and step S2 require an actual test, whereas in the evaluation method of Example 1, step S1' includes a test, but step S2 ' is only a data conversion process. Further, it can be said that step S3 of the first embodiment and step S3' of the second embodiment, and step S4 of the first embodiment and step S4' of the second embodiment are steps in which substantially the same processing is performed.

Next, FIG. 10 shows a schematic functional block diagram of the evaluation device of Example 1, and FIG. 11 shows a schematic functional block diagram of the evaluation device of Example 2. As shown in FIGS. 10 and 11, both parties input data obtained from tests, etc. into evaluation devices 1 and 1' using data input devices 2 and 2', and graph the processing results of the evaluation devices. They have a common configuration in that the evaluation proceeds while displaying the information on the display devices 3 and 3'. As shown in FIG. 10, the evaluation device 1 includes a fracture fluctuation width data acquisition unit 11, a repeated load-rupture frequency relationship data acquisition unit 12, an SN diagram creation unit 13, and As shown in FIG. 11, the evaluation device 1' of the second embodiment includes a frequency dispersion storage modulus E' graph creation section 11', a storage modulus E'- It consists of a fluctuation width relationship graph and a storage elastic modulus E'-fluctuation width vs. rupture frequency relationship graph creation section 12', an SN diagram creation section 13', and an estimated durability life calculation section 14'. Both have in common that they have an SN diagram creation section 13, 13' and an estimated durability life calculation section 14, 14'.

Finally, we will summarize the advantageous effects of the present invention that could not be expected from the prior art. The evaluation method of Examples 1 and 2 of the present invention evaluates the durability (durability) of a paint film by considering the annual movement under the actual environment of a specific building, and is based on the actual building environment. It is possible to obtain a consistent evaluation result, and it has remarkable effects that cannot be predicted from conventional evaluation methods. In addition, in the evaluation method of Example 1, data for the case where the number of failures is one is also added, so it is possible to apply a load of one to several times in a specific building due to an earthquake, typhoon, flood, etc. in a natural environment. Even those skilled in the art have a remarkable effect that is unexpected even for those skilled in the art, in that it can cope with the situation where the membrane is subjected to a large load that may cause it to break. Furthermore, in the evaluation method of Example 2, it is possible to obtain an S-N diagram by simply measuring the dynamic viscoelasticity of the test piece and then converting the data, making it extremely easy to evaluate durability. It has the effect of being able to.

The embodiments of the evaluation method and evaluation apparatus of the present invention have been described above using Examples 1 and 2. However, the present invention is not limited to the evaluation method and evaluation apparatus of Examples 1 and 2. It goes without saying that the present invention is not limited to this, and that it can be implemented in various ways without departing from the spirit of the present invention. In addition, waterproof coatings can be applied not only to buildings in the actual environment, but also to buildings in the planning stage that have not yet been constructed, based on knowledge of the environment (location) in which the building will be constructed. It is something that can be done.

1 Evaluation device 11 Fracture fluctuation width data acquisition unit 12 Repeated load-rupture frequency relationship data acquisition unit 13 S-N diagram creation unit 14 Estimated durability life calculation unit 2 Data input device 3 Display device 1' Evaluation device 11' Frequency dispersion storage elasticity Rate E' graph creation section 12' Storage elastic modulus E'-fluctuation range relationship graph and storage elastic modulus E'-fluctuation frequency relationship graph creation section 13' S-N diagram creation section 14' Estimated durability life calculation section 2 'Data input device 3' Display device

Claims (4)

A method for evaluating the durability of a waterproof coating film formed on a specific building, the method comprising:
Step 1 of determining the fluctuation range at which the waterproof coating film breaks under one load by a crack followability test of the waterproof coating film;
A step 2 of determining the relationship between the fluctuation range and the number of times of failure under a predetermined repeated load through a fatigue test of the waterproof coating film;
Step 3 of creating an SN diagram regarding the relationship between the fluctuation range and the number of breaks, including the case where the number of breaks is one, based on the results obtained in Steps 1 and 2;
When the waterproof coating film formed on the specific building is assumed to receive a load of a predetermined fluctuation range n _i times from the movement of the specific building over the course of one year, from the SN diagram obtained in step 3 above, , a step 4 in which the number of ruptures N _i leading to rupture is determined for the predetermined variation range, and the estimated durability Y of the waterproof coating film formed on the specific building is determined using the following equation (1);
A method for evaluating the durability of waterproof coatings, including:
[Number 1]

Y=1/(Σn _i /N _i )...Formula (1)
A method for evaluating the durability of a waterproof coating film formed on a specific building, the method comprising:
The reference temperature was set from the graph of the storage modulus E' of the temperature dispersion for each measurement frequency, which was obtained by dynamic viscoelasticity measurements at multiple measurement frequencies using a piece of the waterproof coating film. Step 1' of creating a graph of the frequency dispersion storage modulus E';
From the graph of the storage elastic modulus E' of the frequency dispersion, a graph of the relationship between the storage elastic modulus E' and the fluctuation width at which the waterproof coating film breaks under one load, and a graph of the relationship between the storage elastic modulus E' and the predetermined step 2' of creating a graph of the relationship between the number of times of failure and the number of times of failure when subjected to a repeated load with a variation range;
A graph of the relationship between the storage elastic modulus E' and the variation range in which the waterproof coating film breaks after receiving a single load, and a graph showing the relationship between the storage elastic modulus E' and the variation range in which the waterproof coating film breaks after receiving a repeated load in a predetermined variation range. Step 3' of creating an SN diagram regarding the relationship between the fluctuation width and the number of breaks from the graph of the relationship with the number of breaks;
When the waterproof coating film formed on the specific building is assumed to receive a load of a predetermined fluctuation range n _i times from the movement of the specific building over the course of one year, the SN diagram obtained in step 3' Step 4': find the number of breaks N _i that leads to breakage for the predetermined fluctuation range, and calculate the estimated durability Y of the waterproof coating film formed on the specific building using the following equation (1); A method for evaluating the durability of waterproof coatings, including:
[Number 2]

Y=1/(Σn _i /N _i )...Formula (1)
A device for evaluating the durability of a waterproof coating film formed on a specific building,
a rupture fluctuation width data acquisition unit that acquires data of a fluctuation range in which the waterproof coating film ruptures when subjected to one load, which is obtained in a crack followability test of the waterproof coating film;
a cyclic load-number of rupture relationship data acquisition unit that obtains data on the fluctuation range obtained by the fatigue test of the waterproof coating film and the number of ruptures that result in rupture under a predetermined cyclic load;
Data on the fluctuation width at which the waterproof coating film breaks when subjected to one load, which is acquired by the fracture fluctuation width data acquisition section, and when subjected to a predetermined repeated load, which is acquired by the repeated load-number-of-rupture relationship data acquisition section. an SN diagram creation unit that creates an SN diagram regarding the relationship between the fluctuation width and the number of fractures, including the case where the number of fractures is one, based on the data of the number of fractures leading to fracture;
When the waterproof coating formed on the specific building is assumed to receive a load of a predetermined fluctuation range ni times from the movement of the specific building over the course of one year, the S-- From the N diagram, calculate the number of ruptures Ni for the predetermined fluctuation range, and use the following formula (1) to calculate the estimated durability Y of the waterproof coating film formed on the specific building. An evaluation device comprising a calculation unit.
[Number 3]

Y=1/(Σni/Ni) ...Formula (1)
A device for evaluating the durability of a waterproof coating film formed on a specific building,
The reference temperature was set from the graph of the storage modulus E' of the temperature dispersion for each measurement frequency, which was obtained by dynamic viscoelasticity measurements at multiple measurement frequencies using a piece of the waterproof coating film. a frequency dispersion storage modulus E' graph creation unit that creates a graph of the frequency dispersion storage modulus E';
From the graph of the frequency dispersion storage modulus created by the frequency dispersion storage modulus E' graph creation section, it is possible to determine the relationship between the storage modulus E' and the range of variation at which the waterproof coating film ruptures when subjected to one load. Create a graph and a graph of the relationship between the storage modulus E' and the number of fractures that occur after receiving a repeated load of a predetermined fluctuation range Storage modulus E'-variation range relationship graph and storage modulus E'- A breakage frequency relationship graph creation section,
The storage elastic modulus E'-variation range relationship graph and the storage elastic modulus E'-variation width versus rupture frequency relationship graph created by the storage elastic modulus E' and the waterproof coating film ruptured under one load. From the graph of the relationship between the fluctuation width and the graph of the relationship between the storage elastic modulus E' and the number of fractures that occur when subjected to a repeated load of a predetermined fluctuation range, S about the relationship between the fluctuation width and the number of fractures - an S-N diagram creation unit that creates an N diagram;
When the waterproof coating formed on the specific building is assumed to receive a load of a predetermined fluctuation range ni times from the movement of the specific building over the course of one year, the S-- From the N diagram, calculate the number of ruptures Ni for the predetermined fluctuation range, and use the following formula (1) to calculate the estimated durability Y of the waterproof coating film formed on the specific building. An evaluation device comprising a calculation unit.
[Number 4]

Y=1/(Σni/Ni) ...Formula (1)

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