Deterioration determination method for sheet waterproof material

Abstract

To provide a deterioration determination method for sheet waterproof material directly reflecting difference in hardness of a substrate material.SOLUTION: A deterioration determination method for sheet waterproof material 4 determines deterioration of a sheet waterproof material 4 laid on a substrate material 2 by using a relation satisfied by an elongation at fracture Z1(%), an elongation at fracture Z2(%), an elongation percentage Z, temperature T(°C) of the sheet waterproof material 4, hardness H1, and hardness H2. The elongation at fracture Z1(%) is an elongation at fracture before deterioration of the sheet waterproof material 4 that is measured in conformity to JIS K6251. The elongation at fracture Z2(%) is the elongation at fracture after deterioration of the sheet waterproof material 4 that is measured in conformity to JIS K6251. The elongation percentage Z is a ratio (Z2 / Z1). The hardness H1 of the sheet waterproof material 4 is measured by type D durometer in conformity to JIS K6253-3. The hardness H2 of the substrate material 2 is measured by type C durometer in conformity to JIS K7312.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for determining deterioration of a sheet waterproofing material. [Background technology]

[0002] A conventional method for determining deterioration of a sheet waterproofing material using a hardness meter is known, as disclosed in Patent Document 1. This method for determining deterioration of a sheet waterproofing material using a hardness meter is characterized by measuring the hardness of the sheet waterproofing material using a Barcol hardness meter, measuring the surface temperature of the sheet waterproofing material using a surface thermometer, correcting the hardness based on the temperature, and determining the degree of deterioration of the sheet waterproofing material by comparing it with the Barcol hardness.

[0003] However, this method of assessing deterioration of sheet waterproofing materials using a hardness tester uses a Barcol hardness tester, so the upper limit of the temperature for which temperature correction is possible is limited to 30°C. On the other hand, the temperature of sheet waterproofing materials laid on building roofs, etc., exceeds 30°C on sunny days other than winter, and can reach 60°C or higher in summer, so the period when the Barcol hardness tester can be used to assess deterioration of sheet waterproofing materials is limited, making the method impractical.

[0004] Therefore, a method for evaluating the deterioration of sheet waterproofing materials for building roofs, made of polymeric materials, while they are installed, has been developed, as disclosed in Patent Document 2. In this method, the surface hardness of the sheet waterproofing material for building roofs is first measured at its maximum value using a durometer hardness tester, and the temperature of the hardness measurement portion of the sheet waterproofing material is measured. Next, the surface hardness of the sheet waterproofing material measured with the durometer hardness tester is temperature-corrected using a temperature correction formula that shows the relationship between the temperature of the sheet waterproofing material and the hardness measured with the durometer hardness tester, which has been prepared in advance, and the deterioration of the sheet waterproofing material is evaluated from the temperature-corrected hardness value. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 6-27010 [Patent Document 2] Japanese Patent Application Publication No. 11-160215 Summary of the Invention [Problem to be solved by the invention]

[0006] When using a hardness tester to evaluate the deterioration of a sheet waterproofing material laid on a base material, the evaluation of the deterioration not only depends on the surface hardness of the sheet waterproofing material, but can also depend on the hardness of the base material. However, neither the deterioration determination method disclosed in Patent Document 1 nor the deterioration evaluation method disclosed in Patent Document 2 reflects the difference in hardness of the base material.

[0007] The present invention was invented in consideration of the above-mentioned conventional problems, and its purpose is to provide a method for determining the deterioration of sheet waterproofing materials that directly reflects differences in the hardness of the base material. [Means for solving the problem]

[0008] In order to solve the above problem, one embodiment of the method for determining deterioration of a sheet waterproofing material according to the present invention is a method for determining deterioration of the sheet waterproofing material laid on the base material using the relationships satisfied by the elongation at break Z1 (%), elongation at break Z2 (%), elongation rate Z, temperature T (°C) of the sheet waterproofing material, hardness H1 of the sheet waterproofing material, and hardness H2 of the base material.

[0009] The elongation at break Z1 (%) is the elongation at break of the sheet waterproofing material before deterioration, measured in accordance with JIS K 6251. The elongation at break Z2 (%) is the elongation at break of the sheet waterproofing material after deterioration, measured in accordance with JIS K 6251. The elongation percentage Z is the ratio (Z2 / Z1) of the elongation at break Z2 to the elongation at break Z1.

[0010] The hardness H1 of the sheet waterproofing material is the hardness of the sheet waterproofing material measured with a Type D durometer in accordance with JIS K6253-3.The hardness H2 of the base material is the hardness of the base material measured with a Type C durometer in accordance with JIS K7312.

[0011] The method for determining deterioration of a sheet waterproofing material includes a temperature measurement step, a sheet waterproofing material hardness measurement step, a base material hardness estimation step, an elongation rate estimation step, and a deterioration determination step.

[0012] The temperature measurement step is a step of measuring the temperature T (°C) of the sheet waterproofing material laid on the base material. The sheet waterproofing material hardness measurement step is a step of measuring the hardness H1 of the sheet waterproofing material laid on the base material using a type D durometer in accordance with JIS K6253-3. The base material hardness estimation step is a step of estimating the hardness H2 of the base material by direct measurement using a type C durometer in accordance with JIS K7312.

[0013] The elongation percentage estimation step uses the obtained temperature T, hardness H1, hardness H2, elongation percentage Z, and predetermined constants A, B, C, and D determined from the relationship to calculate (Equation 1). Z=A×H1+B×T+C×H2+D (Formula 1) and estimating the elongation rate Z of the sheet waterproofing material laid on the base material using the formula 1. The deterioration determination process is a process for determining the deterioration of the sheet waterproofing material laid on the base material based on the elongation rate Z estimated in the elongation rate estimation process. [Effects of the Invention]

[0014] In one embodiment of the method for determining deterioration of sheet waterproofing material according to the present invention, differences in hardness of the base material are directly reflected, making it possible to accurately determine deterioration of sheet waterproofing material while minimizing complicated work. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view of a roof structure including a sheet waterproofing material according to one embodiment of the present invention. [Figure 2] FIG. 2 is a flow chart of the method for determining deterioration of a sheet waterproofing material according to the embodiment. [Figure 3] FIG. 3 is a table showing the results of a demonstration experiment for measuring the hardness of the sheet waterproofing material in the embodiment. [Figure 4] FIG. 4 is a table showing the results of an experiment for obtaining samples of each physical quantity used in the relational expression deriving step in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention relates to a method for determining deterioration of a sheet waterproofing material, and more particularly to a method for determining deterioration of a sheet waterproofing material laid on a base material. One embodiment of the method for determining deterioration of a sheet waterproofing material according to the present invention will be described below with reference to Figs. 1 to 4.

[0017] The method for determining deterioration of a sheet waterproofing material is a method for determining deterioration of a sheet waterproofing material 4 laid on a base material 2. First, the base material 2 and the sheet waterproofing material 4 will be described.

[0018] (1) Base material As shown in Figure 1, the sheet waterproofing material 4 is laid on a base material 2 that constitutes the skeleton of a building 1. In this embodiment, the sheet waterproofing material 4 is laid via an adhesive layer 3 on the upper surface of the roof 22, which is one of the walls 21 and roof 22 that constitute the skeleton of the building 1.

[0019] In this embodiment, the base material 2 (walls 21 and roof 22) is formed of so-called ALC panels (autoclaved lightweight concrete), but the base material 2 is not limited to ALC panels. Also, in this embodiment, the roof 22 is a flat roof, but the roof 22 does not have to be a flat roof. Furthermore, the building 1 may be a single-story, two-story, three-story or more, and the number of floors of the building 1 is not limited. Furthermore, the material, application amount, etc. of the adhesive constituting the adhesive layer 3 are not particularly limited.

[0020] (2) Sheet waterproofing material The sheet waterproofing material 4 is mainly made of polyvinyl chloride. The sheet waterproofing material 4 may be laid on the base material 2 that constitutes the wall 21, instead of being laid on the base material 2 that constitutes the roof 22. The sheet waterproofing material 4 may be laid on any base material 2 of the building 1's frame. Furthermore, there are no particular limitations on the thickness, etc., of the sheet waterproofing material 4. Furthermore, the material of the sheet waterproofing material 4 is not limited to polyvinyl chloride.

[0021] (3) Method for determining deterioration of sheet waterproofing materials The deterioration determination method for a sheet waterproofing material 4 is a method for determining deterioration of a sheet waterproofing material 4 laid on a base material 2 using relationships satisfied by the physical quantities of the sheet waterproofing material 4, namely, elongation at break Z1 (%), elongation at break Z2 (%), elongation rate Z, temperature T (°C), hardness H1, and hardness H2 of the base material 2. As shown in FIG. 2 , the deterioration determination method for a sheet waterproofing material 4 includes, as essential steps, a temperature measurement step, a sheet waterproofing material hardness measurement step, a base material hardness estimation step, an elongation rate estimation step, and a deterioration determination step. In this embodiment, the deterioration determination method for a sheet waterproofing material 4 further includes a measurement location selection step before the sheet waterproofing material hardness measurement step, and a relational equation derivation step before the elongation rate estimation step. First, each of the physical quantities mentioned above will be described below.

[0022] (3.1) Elongation at break (before degradation) The elongation at break Z1 is the elongation at break (%) of the sheet waterproofing material 4 before deterioration. The elongation at break Z1 is measured in accordance with JIS K6251, and the details of JIS K6251 will not be explained here. The elongation at break Z1 is the elongation at break of the sheet waterproofing material 4 in a so-called new state, that is, when not much time has passed since the sheet waterproofing material 4 was manufactured. The measurement of the elongation at break Z1 is performed on a sheet waterproofing material 4 that is not laid on a base material 2.

[0023] (3.2) Elongation at break (after aging) The elongation at break Z2 is the elongation at break (%) of the sheet waterproofing material 4 after deterioration. Like the elongation at break Z1, the elongation at break Z2 is measured in accordance with JIS K6251. The elongation at break Z2 is the elongation at break measured for a sheet waterproofing material 4 whose performance has changed over time since the sheet waterproofing material 4 was manufactured. The elongation at break Z2 of the sheet waterproofing material 4 decreases as the sheet waterproofing material 4 deteriorates over time. The decrease in the elongation at break Z2 is due to the plasticizer contained in the sheet waterproofing material 4, which is primarily composed of polyvinyl chloride, evaporating and decreasing over time, causing the flexibility of the sheet waterproofing material 4 to be impaired.

[0024] Regarding the measurement of the elongation at break Z2, since it is not possible to measure the elongation at break Z2 for a sheet waterproofing material 4 laid on a base material 2, it is measured for a sheet waterproofing material 4 that has deteriorated over time without being laid on a base material 2.

[0025] Regarding the elongation at break Z2, many sheet waterproofing materials 4 with different elongation at break Z2 are prepared to obtain sample data to be used in the process of deriving the relational equation described below. In this embodiment, sheet waterproofing materials 4 with two types of elongation at break Z2 are prepared.

[0026] (3.3) Growth Rate The elongation Z is the ratio (Z2 / Z1) of the elongation at break Z2 to the elongation at break Z1. The elongation at break Z2 decreases as the sheet waterproofing material 4 deteriorates over time, so it is at its largest value (elongation at break Z1) at the time of manufacture, and the elongation Z at this time is 100%. After manufacture, the elongation Z decreases over time. The deterioration of the sheet waterproofing material 4 is evaluated (determined) by the elongation Z. The smaller the elongation Z, the greater the deterioration of the sheet waterproofing material 4 is evaluated to be.

[0027] (3.4) Temperature The temperature T of the sheet waterproofing material 4 is a factor that affects the hardness measured in the sheet waterproofing material 4. The hardness measured in the sheet waterproofing material 4 will be explained below.

[0028] (3.5) Hardness of sheet waterproofing material The hardness H1 of the sheet waterproofing material 4 is the hardness of the sheet waterproofing material 4 measured using a type D durometer in accordance with JIS K6253-3. Details of JIS K6253-3 will not be explained here. The hardness H1 of the sheet waterproofing material 4 is the hardness of the sheet waterproofing material 4 laid on the base material 2. The hardness H1 of the sheet waterproofing material 4 is measured by workers who visit the site as appropriate over time.

[0029] Regarding the method for measuring the hardness H1 of the sheet waterproofing material 4, a demonstration experiment was conducted on several methods for measuring the hardness H1 of the sheet waterproofing material 4, and as a result, a method using a Type D durometer in accordance with JIS K6253-3 was adopted. The results of this demonstration experiment are shown in Figure 3.

[0030] In the demonstration experiment, the hardness H1 of the sheet waterproofing material 4 was measured using the following methods: (Method 1) measuring with a Type D durometer in accordance with JIS K6253-3, (Method 2) measuring with a Type C1L durometer in accordance with JIS K7312 (or JIS S6050), (Method 3) measuring with a Type C durometer in accordance with JIS K7312 (or JIS S6050), and (Method 4) measuring with a Type F durometer. Note that the hardness H2 of the base material 2 was measured with a Type C durometer in accordance with JIS K7312, as described below.

[0031] In the demonstration experiment, the hardness of the sheet waterproofing material 4 was measured for two degrees of deterioration: severe deterioration (elongation rate Z = 78%) and mild deterioration (elongation rate Z = 98%), and the hardness H2 of the base material 2 was measured for three types: 95, 84, and 64 for each of the two degrees of deterioration of each sheet waterproofing material 4, for a total of six types of measurement objects.The hardness H1 of the sheet waterproofing material 4 was measured using each of (Method 1) to (Method 4).

[0032] In (Method 1), a clear tendency was observed that the less the deterioration of the sheet waterproofing material 4 being measured, the smaller the hardness H1, and also the smaller the hardness H2 of the base material 2, the smaller the hardness H1.

[0033] In contrast, in (Method 2), the greater the deterioration of the sheet waterproofing material 4 being measured, the smaller the hardness H1 tended to be, but the hardness H1 was greatest when the hardness H2 was the medium value of 84, so it is thought that this does not accurately reflect the trend. Also, in (Method 3), the hardness H1 was greatest when the hardness H2 was the medium value of 84, and when the hardness H2 was 64, the less the deterioration, the greater the hardness H1 tended to be, so it is thought that this does not accurately reflect the trend. Also, in (Method 4), the hardness H1 varied greatly from measurement to measurement, making it impossible to measure the hardness H1 accurately. As a result of these factors, (Method 1) is thought to be the most suitable.

[0034] (3.6) Hardness of the substrate The hardness H2 of the base material 2 is the hardness of the base material 2 measured using a Type C durometer in accordance with JIS K7312. Details of JIS K7312 will not be explained here. Although the hardness H2 of the base material 2 does change over time, this is smaller than the change over time in the hardness H1 of the sheet waterproofing material 4, and therefore will not be considered to change over time in this discussion. The hardness H2 of the base material 2 is measured by a worker on-site at some point (usually when the sheet waterproofing material 4 is laid on the base material 2). Regarding the method for measuring the hardness H2 of the base material 2, the method of measuring using a Type C durometer in accordance with JIS K7312, which has been empirically determined to be preferable, is adopted.

[0035] Next, each step of the method for determining deterioration of the sheet waterproofing material 4 will be described.

[0036] (3.7) Relational equation derivation process The relational equation deriving process is a process of calculating predetermined constants A, B, C, and D by multiple regression analysis from the physical quantities of elongation at break Z1 (%), temperature T (°C), and hardness H1 before deterioration, and multiple elongation at break Z2 (%), temperature T (°C), and hardness H1 and hardness H2 at multiple points in time after deterioration, to derive equation 1. The elongation at break Z1 of the sheet waterproofing material 4 before deterioration is the elongation at break of the sheet waterproofing material 4 before it is laid on the base material 2, and is experimentally measured before it is laid on the base material 2.

[0037] The temperature T of the sheet waterproofing material 4 before deterioration is the temperature of the sheet waterproofing material 4 when the elongation at break Z1 of the sheet waterproofing material 4 before deterioration is measured, and is measured at the same time as measuring the elongation at break Z1.

[0038] The hardness H1 of the sheet waterproofing material 4 before deterioration was measured by using the sheet waterproofing material 4 whose elongation at break Z1 before deterioration was measured, and laying the sheet waterproofing material 4 on the same base material 2 as the target. However, since the sheet waterproofing material 4 whose elongation at break Z1 was measured was itself broken at the time of measurement, a sheet waterproofing material 4 in the same condition as that used to measure the elongation at break Z1 is prepared, and this sheet waterproofing material 4 is laid on the base material 2 to measure the hardness H1.

[0039] The elongation at break Z2 of the deteriorated sheet waterproofing material 4 is the elongation at break of the deteriorated sheet waterproofing material 4 that is not laid on the base material 2, and is measured experimentally. The deteriorated sheet waterproofing material 4 may be a sheet waterproofing material 4 that has been manufactured and has been left for a predetermined period of time, or may be a sheet waterproofing material 4 that has been artificially deteriorated by evaporating the plasticizer contained in the sheet waterproofing material 4.

[0040] The temperature T of the deteriorated sheet waterproofing material 4 is the temperature of the deteriorated sheet waterproofing material 4 when the elongation at break Z2 of the deteriorated sheet waterproofing material 4 is measured, and is measured at the same time as measuring the elongation at break Z2.

[0041] The hardness H1 of the sheet waterproofing material 4 after deterioration was measured by using the sheet waterproofing material 4 whose elongation at break Z2 after deterioration was measured, and laying the sheet waterproofing material 4 on the same base material 2 as the target. However, since the sheet waterproofing material 4 whose elongation at break Z2 was measured was itself broken at the time of measurement, a sheet waterproofing material 4 in the same condition as that used to measure the elongation at break Z2 was prepared, and this sheet waterproofing material 4 was laid on the base material 2 to measure the hardness H1.

[0042] The hardness H2 of the base material 2 is the hardness of the base material 2 on which the sheet waterproofing material 4 is laid, and is measured at any timing in a state where the sheet waterproofing material 4 is not laid.

[0043] Each physical quantity measured in the process of deriving the relational equation was measured experimentally, and experiments were conducted to obtain multiple samples. The results of these experiments are shown in Figure 4.

[0044] In the experiment, the hardness of the sheet waterproofing material 4 was measured for three degrees of deterioration: severely deteriorated (elongation rate Z = 78%), moderately deteriorated (elongation rate Z = 98%), and not deteriorated (elongation rate Z = 100%).The hardness H2 of the base material 2 was measured for three levels: 95, 84, and 64.Hardness H1 was measured for a total of 27 levels for nine types of measurement objects, with temperatures T of 10°C, 27°C, and 50°C.

[0045] Using this result, the obtained temperature T, hardness H1, hardness H2, elongation Z, and predetermined constants A, B, C, and D that are more approximately determined are used to calculate (Equation 1). Z=A×H1+B×T+C×H2+D (Formula 1) The relational equation is derived mathematically, particularly statistically, by multiple regression analysis, but the relational equation may also be derived without multiple regression analysis. In this embodiment, the approximate values of A to D are A=-0.009, B=-0.005, C=0.002, and D=1.300. By deriving the relational equation by multiple regression analysis, it is possible to derive a relational equation that is mathematically approximated with high accuracy.

[0046] When the relational expression (Formula 1) is used, preferable ranges for A to D are, for example, -0.011≦A≦-0.007, -0.007≦B≦-0.003, 0.001≦C≦0.003, and 1.1≦D≦1.5.

[0047] (3.8) Temperature measurement process The temperature measurement process is a process of measuring the temperature T (°C) of the sheet waterproofing material 4 laid on the base material 2. The temperature T of the sheet waterproofing material 4 laid on the base material 2 is measured by a worker who goes to the site.

[0048] (3.9) Measurement location selection process The measurement point selection process is a process in which, when an area of accelerated deterioration is found in the sheet waterproofing material 4 laid on the base material 2, the area of accelerated deterioration is selected as the measurement point for measuring hardness H1 in the sheet waterproofing material hardness measurement process.

[0049] The areas of accelerated deterioration can be identified by a worker's visual inspection of the sheet waterproofing material 4 laid on the base material 2, or by comparing images taken of the sheet waterproofing material 4 laid on the base material 2 before and after deterioration, and can be determined to consist of puddles, puddle marks, sludge accumulation, or surface fading formed on the sheet waterproofing material 4 laid on the base material 2. By selecting the areas of accelerated deterioration as the measurement points for measuring hardness H1 in the sheet waterproofing material hardness measurement process, it is possible to prevent the deterioration of the sheet waterproofing material 4 from being underestimated.

[0050] (3.10) Sheet waterproofing material hardness measurement process The sheet waterproofing material hardness measurement process is a process of measuring the hardness H1 of the sheet waterproofing material 4 laid on the base material 2 using a type D durometer in accordance with JIS K6253-3. The hardness H1 of the sheet waterproofing material 4 laid on the base material 2 is measured by a worker who visits the site.

[0051] (3.11) Base material hardness estimation process The base material hardness estimation process is a process of estimating the hardness H2 of the base material 2 by direct measurement using a Type C durometer conforming to JIS K 7312. Note that the hardness H2 of the base material 2 when measured using a Type C durometer conforming to JIS K 7312 may also be calculated by indirect estimation from the material of the base material 2.

[0052] (3.12) Elongation rate estimation process The elongation estimation step uses the obtained temperature T, hardness H1, hardness H2, elongation Z, and predetermined constants A, B, C, and D that are approximately determined by the relationship, to calculate (Equation 1). Z=A×H1+B×T+C×H2+D (Formula 1) This is a process of estimating the elongation rate Z of the sheet waterproofing material 4 laid on the base material 2 using (Equation 1) by defining it as follows. In this embodiment, since the relational equation (Equation 1) has been derived in advance in the relational equation derivation process, i.e., A to D have been found, it is only necessary to substitute the measured H1, H2 and T into this relational equation (Equation 1).

[0053] (3.13) Deterioration determination process The deterioration assessment process is a process for assessing the deterioration of the sheet waterproofing material 4 laid on the base material 2 based on the elongation rate Z estimated in the elongation rate estimation process. When the elongation rate Z estimated in the elongation rate estimation process is less than (or equal to or less than) a reference value (threshold value) for assessing deterioration, it is determined that the deterioration of the sheet waterproofing material 4 has progressed to the point where treatment is required. A suitable reference value for assessing deterioration is, for example, 0.6, but it may also be 0.5, 0.55, 0.65, 0.7, 0.75, etc.

[0054] (4) Summary The deterioration assessment method disclosed in Patent Document 1 recognizes that the Barcol hardness meter varies depending on the configuration of the base of the sheet waterproofing material 4, but merely mentions that as long as the configuration of the sheet waterproofing material 4 and base is constant, the regression equation will show a good correlation even for various sheet waterproofing materials 4 and bases, with only the coefficients changing (see

[0010] ). For this reason, it was unclear specifically how the hardness H2 of the base material 2 affects the hardness H1 and elongation Z of the sheet waterproofing material 4 after deterioration.

[0055] Furthermore, in the deterioration evaluation method disclosed in Patent Document 2, it is merely recognized that, because the measurement of the hardness of the sheet waterproofing material 4 using a durometer is affected by the hardness of the base material 2, when preparing a calibration curve and a straight line (see

[0016] ), it is necessary to provide a base material 2 identical to that used on-site, place the sheet waterproofing material 4 on top of it, and measure the hardness of the sheet waterproofing material 4 (see

[0020] ). For this reason, as with the deterioration determination method disclosed in Patent Document 1, the specific effect that the hardness H2 of the base material 2 has on the hardness H1 and elongation Z of the sheet waterproofing material 4 after deterioration was unknown.

[0056] In this disclosure, the effect that the hardness H2 of the base material 2 has on the hardness H1 and elongation Z of the sheet waterproofing material 4 after deterioration is clarified, and since differences in the hardness of the base material 2 are directly reflected, it is now possible to accurately determine the deterioration of the sheet waterproofing material 4.

[0057] Moreover, by selecting the accelerated deterioration portion as the measurement portion for measuring the hardness H1 in the sheet waterproofing material hardness measurement step, it is possible to prevent the occurrence of underestimation of the deterioration of the sheet waterproofing material 4.

[0058] Furthermore, by deriving the relational expression through multiple regression analysis, it is possible to derive a mathematically approximated relational expression with high accuracy.

[0059] As is clear from the above-described embodiments, the first aspect of the method for determining deterioration of a sheet waterproofing material 4 is a method for determining deterioration of a sheet waterproofing material 4 laid on a base material 2 using the relationships satisfied by the elongation at break Z1 (%), elongation at break Z2 (%), elongation rate Z, temperature T (°C) of the sheet waterproofing material 4, hardness H1 of the sheet waterproofing material 4, and hardness H2 of the base material 2. The elongation at break Z1 (%) is the elongation at break of the sheet waterproofing material 4 before deterioration, measured in accordance with JIS K6251. The elongation at break Z2 (%) is the elongation at break of the sheet waterproofing material 4 after deterioration, measured in accordance with JIS K6251. The elongation rate Z is the ratio (Z2 / Z1) of the elongation at break Z2 to the elongation at break Z1. The hardness H1 of the sheet waterproofing material 4 is the hardness of the sheet waterproofing material 4 measured using a type D durometer in accordance with JIS K6253-3. The hardness H2 of the base material 2 is the hardness of the base material 2 measured by a type C durometer in accordance with JIS K7312.

[0060] The method for determining deterioration of the sheet waterproofing material 4 includes a temperature measurement step, a sheet waterproofing material hardness measurement step, a base material hardness estimation step, an elongation rate estimation step, and a deterioration determination step.

[0061] The temperature measurement process is a process of measuring the temperature T (°C) of the sheet waterproofing material 4 laid on the base material 2. The sheet waterproofing material hardness measurement process is a process of measuring the hardness H1 of the sheet waterproofing material 4 laid on the base material 2 using a type D durometer in accordance with JIS K6253-3. The base material hardness estimation process is a process of estimating the hardness H2 of the base material 2 by direct measurement using a type C durometer in accordance with JIS K7312.

[0062] The elongation estimation step uses the obtained temperature T, hardness H1, hardness H2, elongation Z, and predetermined constants A, B, C, and D determined by the relationship to calculate (Equation 1). Z=A×H1+B×T+C×H2+D (Formula 1) and estimates the elongation rate Z of the sheet waterproofing material 4 laid on the base material 2 using (Equation 1). The deterioration determination process is a process for determining the deterioration of the sheet waterproofing material 4 laid on the base material 2 based on the elongation rate Z estimated in the elongation rate estimation process.

[0063] According to the first aspect, since the difference in hardness of the base material 2 is directly reflected, the deterioration of the sheet waterproofing material 4 can be determined with high accuracy.

[0064] In a second aspect, the method for determining deterioration of a sheet waterproofing material 4 is realized by combining the method with the first aspect. In the second aspect, the method for determining deterioration of a sheet waterproofing material 4 further includes a measurement location selection step before the sheet waterproofing material hardness measurement step. The measurement location selection step is a step of selecting, when an accelerated deterioration location is found in the sheet waterproofing material 4 laid on the base material 2, the accelerated deterioration location as a measurement location for measuring hardness H1 in the sheet waterproofing material hardness measurement step. The accelerated deterioration location is recognized as consisting of puddles, puddle marks, sludge accumulation, or surface discoloration formed on the sheet waterproofing material 4 laid on the base material 2 by a worker's visual inspection of the sheet waterproofing material 4 laid on the base material 2, or by comparing images taken before and after deterioration of the sheet waterproofing material 4 laid on the base material 2.

[0065] According to the second aspect, the occurrence of underestimation of the deterioration of the sheet waterproofing material 4 can be suppressed.

[0066] In a third aspect, this is realized by combining the first or second aspect. In the third aspect, the deterioration determination method for a sheet waterproofing material 4 further includes a relational equation deriving step. The relational equation deriving step is a step of calculating predetermined constants A, B, C, and D by multiple regression analysis from the elongation at break Z1 (%), temperature T (°C), and hardness H1 before deterioration, and multiple elongation at break Z2 (%), temperature T (°C), and hardness H1 and hardness H2 at multiple points in time after deterioration, to derive (Equation 1).

[0067] According to the third aspect, it is possible to derive a mathematically approximated relational expression with high accuracy. [Explanation of symbols]

[0068] 1. Building 2 Undercoat 21 Wall 22 Roof 3 Adhesive layer 4 Sheet waterproofing material

Claims

1. A deterioration determination method for determining deterioration of a sheet waterproofing material laid on a base material using a relationship satisfied by the following: the elongation at break Z1 (%) before deterioration of the sheet waterproofing material measured in accordance with JIS K6251, the elongation at break Z2 (%) after deterioration, the ratio (Z2 / Z1) of the elongation at break Z2 to the elongation at break Z1, the temperature T (°C) of the sheet waterproofing material, the hardness H1 of the sheet waterproofing material measured with a Type D durometer in accordance with JIS K6253-3, and the hardness H2 of the base material measured with a Type C durometer in accordance with JIS K7312; A temperature measurement step of measuring the temperature T (°C) of the sheet waterproofing material laid on the base material; A sheet waterproofing material hardness measurement process for measuring the hardness H1 of the sheet waterproofing material laid on the base material using a type D durometer in accordance with JIS K6253-3; a base material hardness estimation step of estimating the hardness H2 of the base material by direct measurement using a type C durometer in accordance with JIS K7312; Using the obtained temperature T, hardness H1, hardness H2, elongation Z, and predetermined constants A, B, C, and D determined from the relationship, (Equation 1) is Z=A×H1+B×T+C×H2+D...(Formula 1) It stipulates that, An elongation rate estimation step of estimating the elongation rate Z of the sheet waterproofing material laid on the base material from the (Equation 1); and a deterioration determination step of determining deterioration of the sheet waterproofing material laid on the base material based on the elongation rate Z estimated in the elongation rate estimation step. A method for determining deterioration of sheet waterproofing materials.

2. Before the sheet waterproofing material hardness measurement step, The method further includes a measurement point selection step of selecting, when an accelerated deterioration point consisting of a puddle, a puddle mark, sludge accumulation, or surface discoloration formed on the sheet waterproofing material laid on the base material is found by an operator visually inspecting the sheet waterproofing material laid on the base material or by comparing an image taken before deterioration with an image taken after deterioration of the sheet waterproofing material laid on the base material, the accelerated deterioration point as a measurement point for measuring the hardness H1 in the sheet waterproofing material hardness measurement step. A method for determining deterioration of a sheet waterproofing material according to claim 1.

3. The method further includes a relational equation deriving step of calculating the predetermined constants A, B, C, and D by multiple regression analysis from the elongation at break Z1 (%), the temperature T (°C), and the hardness H1 before the deterioration, and a plurality of the elongation at break Z2 (%), the temperature T (°C), the hardness H1, and the hardness H2 at a plurality of time points after the deterioration, to thereby derive the (Equation 1). A method for determining deterioration of a sheet waterproofing material according to claim 1 or 2.

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