A method for calculating the cumulative release amount of asphalt VOCs

Abstract

The application discloses a kind of asphalt VOCs cumulative release amount calculation method, method includes: first, obtaining asphalt sample, based on asphalt sample variety and engineering state, determine the heating temperature of asphalt sample;According to the heating temperature of asphalt sample, the asphalt sample is heated multiple times to collect different concentrations of VOCs standard substance, wherein, before collection, the asphalt sample is sealed according to the sealed heat preservation time and is heat preservation;Second, based on different concentrations of VOCs standard substance, using thermal desorption gas chromatography mass spectrometer to determine VOCs standard substance, to obtain the chromatographic peak area of VOCs under different heating time, then calculate the release rate of VOCs under different heating time;Finally, based on the characteristics of asphalt sample, heating time and the release rate of VOCs corresponding to heating time, using the VOCs release model constructed in advance to calculate the cumulative release amount of asphalt VOCs.

Description

Technical Field

[0001] This invention relates to the field of asphalt materials technology, specifically to a method for calculating the cumulative VOCs release from asphalt. Background Technology

[0002] Asphalt and its mixtures release large amounts of VOCs (Volatile Organic Compounds) during preparation, transportation, and paving, impacting both the environment and construction workers. The accuracy of VOC detection is crucial for understanding the VOC release patterns of asphalt. Currently, there are no standardized regulations for VOCs emitted during the production and use of asphalt and its mixtures, making it difficult to quantitatively study VOC emissions. Most existing VOC detection methods simply measure the change in asphalt mass before and after heating as the VOC release amount, failing to consider the changes in different VOC components and the total release amount throughout the process. Therefore, the accuracy of VOC detection is not high. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a method for calculating the cumulative release of asphalt VOCs, thereby solving the technical problem of low detection accuracy of asphalt VOCs in the prior art.

[0004] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0005] Firstly, the present invention provides a method for calculating the cumulative VOCs release from asphalt, comprising the following steps:

[0006] Obtain asphalt samples, and determine the heating temperature of the asphalt samples based on the type of asphalt samples and the engineering conditions.

[0007] The asphalt sample is heated multiple times according to the heating temperature of the asphalt sample to collect VOCs standard substances of different concentrations. Before collection, the asphalt sample is sealed and kept warm for a certain period of time.

[0008] Based on the VOCs standard substances of different concentrations, the VOCs standard substances were measured by thermal desorption gas chromatography-mass spectrometry to obtain the chromatographic peak area of ​​VOCs at different heating times, and then the release rate of VOCs at different heating times was calculated.

[0009] Based on the characteristics of the asphalt sample, the heating time, and the VOCs release rate corresponding to the heating time, the cumulative VOCs release from the asphalt is calculated using a pre-constructed VOCs release model, wherein the VOCs release model is based on Fick's second law.

[0010] In some embodiments, the asphalt sample is heated multiple times according to its heating temperature to collect VOCs standard substances of different concentrations. The step of sealing and insulating the asphalt sample according to a specified sealing and insulating time before collection includes:

[0011] Set a sealing and heat preservation time, and seal and heat preservation the container containing the asphalt sample before collection;

[0012] Different heating times are set, and the asphalt sample is heated according to the set heating time based on the heating temperature of the asphalt sample;

[0013] After heating is complete, the container containing the asphalt sample is sealed and kept warm for the set sealing and heat preservation time.

[0014] After the sealing and insulation are completed, the VOCs of the asphalt sample are collected by adjusting the sampling flow rate and sampling time of the vacuum pump to collect VOCs standard substances of different concentrations.

[0015] In some embodiments, the VOCs standard substances of different concentrations are measured using thermal desorption gas chromatography-mass spectrometry to obtain the chromatographic peak areas of VOCs at different heating times, and then the release rate of VOCs at different heating times is calculated, including:

[0016] After chromatographic peak calibration of VOCs standard substances of different concentrations using thermal desorption gas chromatography-mass spectrometry, the chromatographic peak areas of VOCs under different heating times were obtained.

[0017] Based on the concentration of the VOCs standard substance and the chromatographic peak area of ​​the VOCs, a linear relationship between the VOCs concentration and the chromatographic peak area is determined.

[0018] Based on the chromatographic peak area of ​​the VOCs, the release amount of VOCs at different heating times was calculated.

[0019] Based on the VOCs release amount and the sealed heat preservation time, the VOCs release rate under different heating times was calculated.

[0020] In some embodiments, the VOCs release rate is calculated as follows:

[0021]

[0022] Where V(t) is the release rate, m e The mass of VOCs measured in the experiment is given by S, where S is the surface area of ​​the asphalt sample, and t is the mass of VOCs measured in the experiment. c The time for the container to be sealed and kept warm before each sampling.

[0023] In some embodiments, the calculation of the cumulative VOCs release from asphalt using a pre-built VOCs release model, based on the characteristics of the asphalt sample, heating time, and VOCs release rate corresponding to the heating time, includes:

[0024] Linear fitting was performed on the heating time and the VOCs release rate corresponding to the heating time to calculate the slope and intercept;

[0025] Based on the VOCs release model and the slope and intercept, the initial concentration and diffusion coefficient were calculated;

[0026] Based on the initial concentration and diffusion coefficient, the fitted VOCs release rate was calculated;

[0027] A preset average relative error threshold is used to calculate the average relative error of the VOCs release rate based on the fitted VOCs release rate and the VOCs release rate corresponding to the heating time.

[0028] When the average relative error is less than the average relative error threshold, the fitted VOCs release rate is integrated to calculate the cumulative release of asphalt VOCs.

[0029] In some embodiments, the characteristics of the asphalt sample include at least one of the following: mass of the asphalt sample, surface area, and asphalt height.

[0030] In some embodiments, the slope and intercept are calculated as follows:

[0031]

[0032]

[0033] Where A is the slope, B is the intercept, and D is the angle. m C is the diffusion coefficient of the substance in asphalt material. m,0 denoted as the initial concentration of asphalt, and h as the asphalt height.

[0034] In some embodiments, the VOCs release model is calculated as follows:

[0035] lnV(t) = At ​​+ B,

[0036] Where lnV(t) is the VOCs release model, A is the slope, B is the intercept, and t is the heating time.

[0037] In some embodiments, the fitted VOCs release rate is calculated as follows:

[0038]

[0039] Where V(t) is the fitted VOCs release rate, D m C is the diffusion coefficient. m,0 denoted as the initial concentration of the asphalt, h as the asphalt height, and t as the heating time.

[0040] In some embodiments, the cumulative release of asphalt VOCs is calculated as follows:

[0041]

[0042] Where C(t) is the cumulative release of asphalt VOCs, V(t) is the release rate, and dt is a differential element of time t.

[0043] Compared with existing technologies, the method for calculating the cumulative release of asphalt VOCs provided by this invention establishes key parameters of the VOCs release model by measuring the VOCs release amount under different heating times. This allows for the calculation of the total VOCs release during the entire release process. Representative sampling allows for the reflection of VOCs release patterns from a large batch of asphalt samples using data from a small number of samples. VOCs are collected under sealed, insulated conditions to measure the release amount of all gases during the insulated time, and the average release rate during this time is calculated. This method increases the detection concentration of VOCs, and the average rate ensures the accuracy of detection, avoiding experimental deviations caused by some low-concentration components failing to reach the detection limit or due to low concentration. The diffusion coefficient and initial concentration can be fitted using the VOCs release rate at different heating times. A VOCs release model is established based on Fick's second law, and the accuracy of the prediction model is determined using MRE (Mean Reaction). The release model can be used to obtain the release rate and total release amount of asphalt VOCs at any given time, providing data guidance for targeted suppression of VOCs at different construction stages, effectively saving testing time and energy consumption, and improving the detection rate. Attached Figure Description

[0044] Figure 1 This is a flowchart of an embodiment of the method for calculating the cumulative release of asphalt VOCs provided by the present invention;

[0045] Figure 2 The release rate test and calculation results of VOCs from sample 70# asphalt in the embodiment of the cumulative release method of asphalt VOCs provided by the present invention;

[0046] Figure 3 The cumulative VOCs release result of sample 70# asphalt in the embodiment of the cumulative VOCs release method provided by the present invention;

[0047] Figure 4The release rate test and calculation results of VOCs release from rubber asphalt samples in the embodiment of the cumulative release method of asphalt provided by the present invention;

[0048] Figure 5 The cumulative VOCs release results of rubber asphalt samples in the embodiments of the cumulative VOCs release method provided by the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0050] This invention provides a method for calculating the cumulative VOCs release from asphalt. Figure 1 This is a flowchart of the method for calculating the cumulative VOCs release from asphalt provided in this embodiment of the invention. Please refer to [link / reference]. Figure 1 The method for calculating the cumulative VOCs release from asphalt includes the following steps:

[0051] S100. Obtain asphalt samples and determine the heating temperature of the asphalt samples based on the type of asphalt samples and the engineering conditions.

[0052] S200. Based on the heating temperature of the asphalt sample, the asphalt sample is heated multiple times to collect VOCs standard substances of different concentrations. Before collection, the asphalt sample is sealed and kept warm for a specified time.

[0053] S300. Based on VOCs standard substances of different concentrations, the VOCs standard substances are measured by thermal desorption gas chromatography-mass spectrometry to obtain the chromatographic peak area of ​​VOCs at different heating times, and then the release rate of VOCs at different heating times is calculated.

[0054] S400. Based on the characteristics of the asphalt sample, the heating time, and the VOCs release rate corresponding to the heating time, the cumulative VOCs release of asphalt is calculated using a pre-constructed VOCs release model, which is based on Fick's second law.

[0055] In this embodiment, firstly, asphalt samples are obtained, and the heating temperature of the asphalt samples is determined based on the type of asphalt sample and the engineering condition. The asphalt samples are then heated multiple times according to the heating temperature to collect VOCs standard materials of different concentrations. Before collection, the asphalt samples are sealed and kept at a constant temperature for a specified time. Secondly, based on the VOCs standard materials of different concentrations, thermal desorption gas chromatography-mass spectrometry (TCMS) is used to measure the VOCs standard materials. After obtaining the chromatographic peak areas of VOCs at different heating times, the release rate of VOCs at different heating times is calculated. Finally, based on the characteristics of the asphalt samples, the heating time, and the VOCs release rate corresponding to the heating time, a pre-constructed VOCs release model is used to calculate the cumulative release of asphalt VOCs. The VOCs release model is based on Fick's second law, which improves the detection accuracy and detection rate of asphalt VOCs.

[0056] In some embodiments, in step S100, representative samples of 70# base asphalt are taken according to T0601-2011 of the JTG E20-2011 Highway Engineering Asphalt and Asphalt Mixture Test and Inspection Specification to obtain asphalt samples. The asphalt samples are placed in conical flasks to determine the characteristics of the asphalt samples. The asphalt samples can be base asphalt, SBS modified asphalt, rubber asphalt, SBR modified asphalt, or a homogeneous mixture of single asphalt or multiple asphalts. The mass of the asphalt sample is 30-60g, and the volume of the conical flask is 250-1000ml. The characteristics of the asphalt samples include at least one of the following: mass of the asphalt sample, surface area, and asphalt height.

[0057] After representative sampling of 70# base asphalt, the mass of the asphalt sample was determined to be 50g. The surface area S of the asphalt in the conical flask was measured to be 30.97cm² using vernier calipers. 2 The asphalt height h is 0.015m.

[0058] Based on the type of asphalt sample and the engineering conditions, the heating temperature of the asphalt sample was determined. The heating temperature of the asphalt sample was simulated by the heating temperature of the base asphalt in the asphalt tank during actual construction. The heating temperature of the #70 asphalt sample was determined to be 140℃. During the heating process, the conical flask was kept open to allow VOCs to be released freely.

[0059] In some embodiments, representative samples of rubber asphalt were taken according to T0601-2011 of the JTG E20-2011 Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering, and the mass of the asphalt sample was determined to be 50g, with an upper surface area S of 30.97cm². 2The asphalt height h is 0.015m. The heating temperature of this asphalt sample is determined to be 160℃ and maintained to simulate the temperature of asphalt in the mixing plant and transportation process. During the heating process, the conical flask is kept open to allow VOCs to be released freely.

[0060] In some embodiments, in step S200, the conical flask is sealed before collection to collect VOCs, a sealing and heat preservation time is set, the container containing the asphalt sample is sealed and heat-preserved before collection, different heating times are set, and the asphalt sample is heated according to the heating temperature of the asphalt sample and the different heating times are set. After heating is completed, the container containing the asphalt sample is sealed and heat-preserved according to the set sealing and heat preservation time. After sealing and heat preservation is completed, the VOCs in the container are collected by adjusting the sampling flow rate of the vacuum pump and the sampling time to collect VOCs standard substances of different concentrations.

[0061] VOCs were collected from asphalt samples at different heating times. Before each collection, the conical flask was sealed and kept warm for 5-10 minutes. After the sealing and warming was completed, the VOCs in the conical flask were collected by using a vacuum pump connected to an adsorption tube. The sampling flow rate of the vacuum pump was 1.0-0.2 L / min, and the sampling time was 10-15 seconds each time.

[0062] The heating time for 70# asphalt samples was set to 30 min, 60 min, 90 min, and 120 min, and the sealing and heat preservation time was set to 10 min. VOCs were collected at heating times of 30 min, 60 min, 90 min, and 120 min. Before collection, the samples were sealed and heat-preserved for 10 min. After the sealing and heat preservation was completed, the vacuum pump sampling flow rate was adjusted to 0.2 L / min and the sampling time was 15 s. After the VOCs collection was completed, VOCs standard substances of different concentrations were obtained at different heating times.

[0063] In some embodiments, the heating time of the rubber asphalt sample is set to 40 min, 70 min, 90 min, and 120 min, and the sealing and heat preservation time is set to 10 min. VOCs are collected at heating times of 40 min, 70 min, 90 min, and 120 min, respectively. The vacuum pump sampling flow rate is adjusted to 0.2 L / min and the sampling time is 15 s to complete the VOCs collection.

[0064] In some embodiments, in step S300, the VOCs standard substances of different concentrations collected by the adsorption tube are chromatographically calibrated using a thermal desorption gas chromatography-mass spectrometry system to obtain the chromatographic peak areas of VOCs at different heating times.

[0065] Based on the concentration of VOCs standard substances and the chromatographic peak area of ​​VOCs, a linear relationship between VOCs concentration and chromatographic peak area, i.e., a standard curve, is determined. The release amount of VOCs at different heating times is calculated by analyzing the chromatographic peak area of ​​VOCs at different heating times. Based on the VOCs release amount and the sealed holding time, the release rate of VOCs at different heating times is calculated. Dividing the VOCs release amount by the holding time yields the release rate within the sealed holding time. The formula for calculating the VOCs release rate is as follows:

[0066]

[0067] Where V(t) is the release rate, m e The mass of VOCs measured in the experiment is given by S, where S is the surface area of ​​the asphalt sample, and t is the mass of VOCs measured in the experiment. c The time for the container to be sealed and kept warm before each sampling.

[0068] Taking the benzothiazole component in VOCs obtained from a 70# base asphalt sample after heating as an example, the VOCs release rates at heating times of 30 min, 60 min, 90 min, and 120 min were calculated, with a corresponding release rate of 9.18 ug / m³. 2 / min, 6.60ug / m 2 / min, 4.50ug / m 2 / min, 3.47ug / m 2 / min, recorded as the test result.

[0069] In some embodiments, taking the benzothiazole component in VOCs obtained by heating a rubber asphalt sample as an example, the VOCs release rates at heating times of 40 min, 70 min, 90 min, and 120 min were calculated, and the corresponding release rates were 3970.84 ug / m³. 2 / min, 2673.36ug / m 2 / min, 1957.33ug / m 2 / min, 1436.74ug / m 2 / min, recorded as the test result.

[0070] In some embodiments, in step S400, Fick's second law is used to establish a VOCs release model. The logarithm of the VOCs release rate under the four heating times is taken to determine the linear relationship between the release rate and the heating time. A linear fit is performed on the release rate and heating time to calculate the slope and intercept. Based on the VOCs release model and the slope and intercept, the initial concentration and diffusion coefficient are calculated. Based on the initial concentration and diffusion coefficient, the fitted VOCs release rate is calculated, and the slope is calculated as follows:

[0071]

[0072] Where A is the slope, D m The diffusion coefficient (m) of the substance in asphalt material 2 / s), where h is the asphalt height (m), and the intercept is calculated as follows:

[0073]

[0074] Where B is the intercept, and D is the... m C is the diffusion coefficient. m,0 Initial concentration of asphalt inside (ug / m³) 3 ), where h is the asphalt height, and the VOCs release model is calculated using the following formula:

[0075] lnV(t) = At ​​+ B,

[0076] Where lnV(t) is the functional relationship between the release rate and the heating time, A is the slope, B is the intercept, and t is the heating time (s). The formula for calculating the VOCs release rate after fitting is:

[0077]

[0078] Where V(t) is the fitted VOCs release rate, D m C is the diffusion coefficient. m,0 denoted as the initial concentration of the asphalt, h as the asphalt height, and t as the heating time.

[0079] A preset average relative error threshold is used. Based on the fitted VOCs release rate and the VOCs release rate corresponding to heating time, the average relative error (MRE) of the VOCs release rate is calculated. The accuracy of the VOCs release model parameters is determined by comparing the average relative error with the average relative error threshold. When the average relative error is less than the threshold, the parameters of the VOCs release model are considered correct. Once the parameters are correct, the fitted VOCs release rate is integrated to calculate the cumulative VOCs release from asphalt. The formula for calculating the cumulative VOCs release from asphalt is:

[0080]

[0081] Where C(t) is the cumulative release of asphalt VOCs, V(t) is the release rate, and dt is a differential element of time t.

[0082] In some embodiments, taking the benzothiazole component in the VOCs of 70# asphalt sample as an example, the slope A and intercept B are calculated to be -1.834*10. -4 And -1.556, initial concentration C m,0 and diffusion coefficient D m They are 9.461×10⁴ ug / m 3 and 1.672×10 -8 m 2 / s, the formula for calculating the release rate of VOCs after fitting is:

[0083]

[0084] This curve represents the calculation result; please refer to [link / reference]. Figure 2 The MRE (Mean Reduction) of VOCs release rates at four heating time points (30 min, 60 min, 90 min, and 120 min) was calculated using the fitted VOCs release rate. The result was 0.55%, lower than the required 5%, indicating a good fit and the VOCs release model parameters were considered correct. The cumulative VOCs release from asphalt can be calculated by integrating the fitted VOCs release rate. Please refer to [link to relevant documentation] for the cumulative VOCs release from asphalt. Figure 3 .

[0085] In some embodiments, taking the benzothiazole component in the VOCs of a rubber asphalt sample as an example, the slope A and intercept B are calculated to be -2.146 and 4.693, respectively, and the initial concentration C... m,0 and diffusion coefficient D m They are 4.184×10 7 ug / m 3 and 1.957×10 -8 m 2 / s, the formula for calculating the release rate of VOCs after fitting is:

[0086]

[0087] This curve represents the calculation result; please refer to [link / reference]. Figure 4The MRE (Mean Reduction) of VOCs release rates at four heating time points (40 min, 70 min, 90 min, and 120 min) was calculated using the fitted VOCs release rate. The result was 0.61%, lower than the required 5%, indicating a good fit and the VOCs release model parameters were considered correct. The cumulative VOCs release from asphalt was calculated; for details, please refer to [link to relevant documentation]. Figure 5 .

[0088] In summary, the method for calculating the cumulative release of asphalt VOCs provided by this invention firstly involves obtaining an asphalt sample and determining the heating temperature based on the sample type and engineering conditions. The asphalt sample is then heated multiple times according to this heating temperature to collect VOCs standard substances of different concentrations. Before collection, the asphalt sample is kept in a sealed, heat-controlled environment for a specified time. Secondly, based on the VOCs standard substances of different concentrations, thermal desorption gas chromatography-mass spectrometry (TCMS) is used to measure the VOCs standard substances. After obtaining the chromatographic peak areas of VOCs at different heating times, the release rate of VOCs at different heating times is calculated. Finally, based on the characteristics of the asphalt sample, different heating times, and the corresponding VOCs release rates, a pre-constructed VOCs release model is used to calculate the cumulative release of asphalt VOCs, thus improving the accuracy and detection rate of asphalt VOCs.

[0089] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the cumulative VOCs release from asphalt, characterized in that, Includes the following steps: Obtain asphalt samples, and determine the heating temperature of the asphalt samples based on the type of asphalt samples and the engineering conditions. The asphalt sample is heated multiple times according to the heating temperature of the asphalt sample to collect VOCs standard substances of different concentrations. Before collection, the asphalt sample is sealed and kept warm for a certain period of time. Based on the VOCs standard substances of different concentrations, the VOCs standard substances were measured by thermal desorption gas chromatography-mass spectrometry to obtain the chromatographic peak area of ​​VOCs at different heating times, and then the release rate of VOCs at different heating times was calculated. Based on the characteristics of the asphalt sample, the heating time, and the VOCs release rate corresponding to the heating time, the cumulative VOCs release from the asphalt is calculated using a pre-constructed VOCs release model. The VOCs release model is based on Fick's second law. The calculation of the cumulative VOCs release from the asphalt using the pre-constructed VOCs release model includes: Linear fitting was performed on the heating time and the VOCs release rate corresponding to the heating time to calculate the slope and intercept; Based on the VOCs release model and the slope and intercept, the initial concentration and diffusion coefficient were calculated; Based on the initial concentration and diffusion coefficient, the fitted VOCs release rate was calculated; A preset average relative error threshold is used to calculate the average relative error of the VOCs release rate based on the fitted VOCs release rate and the VOCs release rate corresponding to the heating time. When the average relative error is less than the average relative error threshold, the fitted VOCs release rate is integrated to calculate the cumulative release of asphalt VOCs.

2. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The asphalt sample is heated multiple times according to its heating temperature to collect VOCs standard substances of different concentrations. The process includes sealing and heat-insulating the asphalt sample for a specified time before collection, which includes: Set a sealing and heat preservation time, and seal and heat preservation the container containing the asphalt sample before collection; Different heating times are set, and the asphalt sample is heated according to the set heating time based on the heating temperature of the asphalt sample; After heating is complete, the container containing the asphalt sample is sealed and kept warm for the set sealing and heat preservation time. After the sealing and insulation are completed, the VOCs of the asphalt sample are collected by adjusting the sampling flow rate and sampling time of the vacuum pump to collect VOCs standard substances of different concentrations.

3. The method for calculating the cumulative VOCs release from asphalt according to claim 2, characterized in that, The VOCs standard substances based on different concentrations were measured using thermal desorption gas chromatography-mass spectrometry to obtain the chromatographic peak areas of VOCs at different heating times. The release rates of VOCs at different heating times were then calculated, including: After chromatographic peak calibration of VOCs standard substances of different concentrations using thermal desorption gas chromatography-mass spectrometry, the chromatographic peak areas of VOCs under different heating times were obtained. Based on the concentration of the VOCs standard substance and the chromatographic peak area of ​​the VOCs, a linear relationship between the VOCs concentration and the chromatographic peak area is determined. Based on the chromatographic peak area of ​​the VOCs, the release amount of VOCs at different heating times was calculated. Based on the VOCs release amount and the sealed heat preservation time, the VOCs release rate under different heating times was calculated.

4. The method for calculating the cumulative VOCs release from asphalt according to claim 3, characterized in that, The formula for calculating the release rate of VOCs is: ， in, For the release rate, The mass of VOCs measured in the experiment, The area of ​​the upper surface of the asphalt sample. The time for the container to be sealed and kept warm before each sampling.

5. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The characteristics of the asphalt sample include at least one of the following: mass, surface area, and asphalt height.

6. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The formulas for calculating the slope and intercept are as follows: ， ， in, The slope The intercept is... is the diffusion coefficient of the substance in asphalt material. This represents the initial concentration inside the asphalt. This refers to the asphalt height.

7. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The calculation formula for the VOCs release model is as follows: ， in, Model for releasing VOCs The slope The intercept is... This refers to the heating time.

8. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The formula for calculating the fitted VOCs release rate is: ， in, The fitted VOCs release rate, The diffusion coefficient is... This represents the initial concentration inside the asphalt. For asphalt height, This refers to the heating time.

9. The method for calculating the cumulative VOCs release from asphalt according to claim 1, characterized in that, The formula for calculating the cumulative VOCs release from asphalt is: ， in, This represents the cumulative VOCs release from asphalt. For the release rate, For time The infinitesimal element.

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