Method for evaluating asphalt odor characteristics

Abstract

The present application relates to the technical field of road engineering, and provides a kind of asphalt peculiar smell feature evaluation method, the method comprises: determining the peculiar smell activity value of various asphalt volatile matter;Various asphalt volatile matter is classified to obtain various components, and the component concentration of various components is determined;According to the peculiar smell activity value of various asphalt volatile matter, the component peculiar smell activity value of various components is added, to determine the component peculiar smell threshold value of various components according to the component peculiar smell activity value of various components and component concentration;According to the component peculiar smell threshold value of various components and component concentration, the approximate peculiar smell activity value is added, and the peculiar smell feature of asphalt is evaluated using the approximate peculiar smell activity value addition.The present application can effectively objectively and accurately evaluate the peculiar smell feature of asphalt material by component peculiar smell threshold value, component concentration and approximate peculiar smell activity value addition, and simplifies the peculiar smell feature evaluation of asphalt.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road engineering, and particularly relates to a method for evaluating asphalt odor characteristics. BACKGROUND

[0002] During the heating or high-temperature treatment of asphalt, a large amount of volatile substances will be generated, and the volatile substances contain a large amount of volatile organic compounds, sulfur dioxide, nitrogen oxides and the like. These substances not only cause irreversible damage to the surrounding environment, but also produce odors in the air, which further affect the quality of people's life and economic activities.

[0003] At present, with the gradual transformation of China's social economy to green and sustainable, the increasingly serious environmental problems and environmental protection needs have gradually become the focus of attention in various fields. In recent years, various problems related to odors that affect health and economy have increased, so it is necessary to evaluate the odor characteristics of asphalt-based pavement materials, but the traditional method for evaluating the odor characteristics of asphalt is complicated. SUMMARY

[0004] The present application provides a method for evaluating the odor characteristics of asphalt, which solves the problem of complicated evaluation of the odor characteristics of asphalt. By adding the component odor threshold value, component concentration and approximate odor activity value, the odor characteristics of asphalt materials can be objectively and accurately evaluated, and the evaluation of the odor characteristics of asphalt is simplified.

[0005] The present application provides a method for evaluating the odor characteristics of asphalt, which includes:

[0006] determining the odor activity values of various asphalt volatile substances;

[0007] classifying various asphalt volatile substances to obtain various components, and determining the component concentrations of the various components;

[0008] determining the component odor activity value addition of the various components according to the odor activity values of the various asphalt volatile substances, and determining the component odor threshold values of the various components according to the component odor activity value addition and the component concentrations of the various components;

[0009] determining the approximate odor activity value addition according to the component odor threshold values and the component concentrations of the various components, and using the approximate odor activity value addition to evaluate the odor characteristics of asphalt.

[0010] In one embodiment, the process of determining the component odor activity value addition of the various components according to the odor activity values of the various asphalt volatile substances is as follows:

[0011]

[0012] where GSOAV represents the sum of the component odor activity values of the various components, OAV i represents the odor activity value of the asphalt volatile, i represents the number of the asphalt volatile, i = 1, 2, 3,..., n.

[0013] In one embodiment, the process of determining the sum of the approximate odor activity values according to the component odor threshold values and the component concentrations of the various components is shown as follows:

[0014]

[0015] where GOT represents the component odor threshold values of the various components, GSOAV represents the sum of the component odor activity values of the various components, and GC represents the component concentrations of the various components.

[0016] In one embodiment, the process of determining the sum of the approximate odor activity values according to the component odor threshold values and the component concentrations of the various components is shown as follows:

[0017]

[0018] where ASOAV represents the sum of the approximate odor activity values, GC represents the component concentrations of the various components, GOT represents the component odor threshold values of the various components, and i' represents the number of the various components, i' = 1, 2, 3,..., n.

[0019] In one embodiment, the process of determining the odor activity values of the various asphalt volatiles includes:

[0020] determining the concentration values and the odor threshold values of the various asphalt volatiles;

[0021] determining the odor activity values of the various asphalt volatiles according to the concentration values and the odor threshold values of the various asphalt volatiles.

[0022] In one embodiment, the process of determining the odor activity values of the various asphalt volatiles according to the concentration values and the odor threshold values of the various asphalt volatiles is shown as follows:

[0023]

[0024] where OAV i represents the odor activity value of the asphalt volatile, C i represents the concentration value of the asphalt volatile, represents the odor threshold value of the asphalt volatile, i represents the number of the asphalt volatile, i = 1, 2, 3,..., n.

[0025] In one embodiment, the evaluation of the asphalt odor characteristics by using the approximate odor activity value sum includes:

[0026] The odor pollution situation is determined according to the approximate odor activity value sum, and the asphalt odor characteristics are evaluated based on the odor pollution situation.

[0027] The asphalt odor characteristics evaluation method provided by the present application determines the odor activity values of various asphalt volatile substances, classifies the various asphalt volatile substances to obtain various components, and determines the component concentrations of the various components. According to the odor activity values of the various asphalt volatile substances, the component odor activity value sum of the various components is determined, and the component odor threshold of the various components is determined according to the component odor activity value sum and the component concentration of the various components. The approximate odor activity value sum is determined according to the component odor threshold and the component concentration of the various components, and the asphalt odor characteristics are evaluated by using the approximate odor activity value sum. The component odor threshold, the component concentration, and the approximate odor activity value sum can effectively and objectively evaluate the odor characteristics of the asphalt material, and simplify the evaluation of the asphalt odor characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is one of the flowcharts of the asphalt odor characteristics evaluation method provided by the present application;

[0030] Figure 2 is the second flowchart of the asphalt odor characteristics evaluation method provided by the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the present application will be described clearly and completely in the following with reference to the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The asphalt odor characteristics evaluation method of the present application will be described below. Figures 1-2

[0033] Specifically, the present application provides an asphalt odor characteristics evaluation method, which is described with reference to​Figure 1 , Figure 1 is one of the flowcharts of the asphalt odor characteristic evaluation method provided by the present application.

[0034] The asphalt odor characteristic evaluation method provided by the embodiments of the present application comprises:

[0035] Step 100, determining the odor activity value of various asphalt volatile substances;

[0036] It should be noted that various organic volatile substances (Volatile Organic Compounds, VOCs) and inorganic volatile substances will be produced during the heating or high-temperature treatment of the matrix asphalt material. Among them, the asphalt volatile substances include organic volatile substances and inorganic volatile substances.

[0037] The concentration value and the odor threshold value of various asphalt volatile substances are determined, and then the odor activity value of various asphalt volatile substances is determined according to the concentration value and the odor threshold value (Odor Thresholds, OT) of various asphalt volatile substances.

[0038] Among them, the process of determining the odor activity value of various asphalt volatile substances according to the concentration value and the odor threshold value of various asphalt volatile substances is as follows:

[0039]

[0040] In the formula, OAV i represents the odor activity value of the asphalt volatile substance, C i represents the concentration value of the asphalt volatile substance, represents the odor threshold value of the asphalt volatile substance, i represents the number of the asphalt volatile substance, i = 1, 2, 3,..., n.

[0041] Step 200, classifying various asphalt volatile substances to obtain various components, and determining the component concentration of the various components;

[0042] It should be noted that the asphalt organic volatile substances can be divided into various components such as alkanes, alkenes, benzene series, aldehydes, ketones and the like according to the chemical structure.

[0043] In the process of determining the odor activity value of various asphalt volatile substances, various asphalt volatile substances are classified to obtain various components, and the component concentration (Group Concentration, GC) of the various components is determined.

[0044] Step 300, determining the Group Sum of the Odor Activity Value (GSOAV) of each type of component according to the Odor Activity Value of various asphalt volatile substances, so as to determine the Group Odor Thresholds (GOT) of each type of component according to the Group Sum of the Odor Activity Value and the component concentration of each type of component;

[0045] The process of determining the Group Sum of the Odor Activity Value (GSOAV) of each type of component according to the Odor Activity Value of various asphalt volatile substances is shown as follows:

[0046]

[0047] In the formula, GSOAV represents the Group Sum of the Odor Activity Value of each type of component, OAVi represents the Odor Activity Value of each type of component, and i represents the number of each type of component, i = 1, 2, 3,..., n. i

[0048] The process of determining the Group Odor Thresholds (GOT) of each type of component according to the Group Sum of the Odor Activity Value and the component concentration of each type of component is shown as follows:

[0049]

[0050] In the formula, GOT represents the Group Odor Thresholds of each type of component, GSOAV represents the Group Sum of the Odor Activity Value of each type of component, and GC represents the component concentration of each type of component.

[0051] Step 400, determining the Approximate Sum of Odor Activity Value (ASOAV) according to the Group Odor Thresholds and the component concentration of each type of component, and using the Approximate Sum of Odor Activity Value to evaluate the odor characteristics of asphalt.

[0052] The process of determining the Approximate Sum of Odor Activity Value (ASOAV) according to the Group Odor Thresholds and the component concentration of each type of component is shown as follows:

[0053]

[0054] In the formula, ASOAV represents the Approximate Sum of Odor Activity Value, GC represents the component concentration of each type of component, GOT represents the Group Odor Thresholds of each type of component, and i represents the number of each type of component, i = 1, 2, 3,..., n. ′ ′

[0055] ​​​After the ASOAV index is determined, the odor pollution situation is determined according to the approximate odor activity value addition, and the asphalt odor characteristics are evaluated based on the odor pollution situation.

[0056] The asphalt odor characteristic evaluation method provided in the embodiments of the present application determines the odor activity values of various asphalt volatile substances, classifies various asphalt volatile substances to obtain various components, and determines the component concentrations of the various components; determines the component odor activity value addition of the various components according to the odor activity values of the various asphalt volatile substances, determines the component odor threshold values of the various components according to the component odor activity value addition and the component concentrations of the various components, and evaluates the asphalt odor characteristics by using the approximate odor activity value addition. The component odor threshold values, the component concentrations, and the approximate odor activity value addition can be used to effectively and objectively and accurately evaluate the odor characteristics of asphalt materials, and the asphalt odor characteristic evaluation is simplified.

[0057] Reference Figure 2 , Figure 2 is a flowchart of the asphalt odor characteristic evaluation method provided in the present application.

[0058] In the embodiments of the present application, the asphalt odor characteristic evaluation method includes the following steps:

[0059] (1) The concentrations of organic volatile substances (VOCs) and inorganic volatile substances generated in the heating or high-temperature treatment process of the matrix asphalt material are calibrated, and the odor activity values (OAV) of the substances are calculated by using the odor threshold values (OT) of the substances.

[0060] Suppose that the selected asphalt is BJ-N90, SK-N90, Shell-N70, XA-N70, and HD-N70 matrix asphalt, and the main purpose of the method is to simplify the evaluation of the asphalt odor characteristics.

[0061] In order to calibrate the concentrations of the substances in the asphalt volatile substances, the asphalt volatile substances need to be collected first, then the asphalt volatile substances are subjected to qualitative and quantitative analysis, and finally the odor activity values of the various asphalt volatile substances are calculated.

[0062] The calculation formula of the odor activity value of the asphalt volatile substances is as follows:

[0063]

[0064] In the formula, OAV i represents the odor activity value of the asphalt volatile substances, C i represents the concentration value of the asphalt volatile substances, wherein GSOAV represents the component odor activity value sum of each component, OAV represents the odor activity value of the asphalt volatile matter, i represents the number of the asphalt volatile matter, and i = 1, 2, 3,..., n.

[0065] (2) Classify the volatile inorganic matter and calculate the component concentration (GC) of each component.

[0066] The five kinds of asphalt organic volatile matters obtained in step (1) were classified into alkanes, alkenes, benzene series, aldehydes, ketones, and volatile inorganic matter according to chemical structure, and the component concentration of each component was calculated and classified, and the results were summarized in Table 1.

[0067] Table 1 Component concentration of each component of five kinds of asphalt

[0068] BJ-N90 SK-N90 Shell-N70 XA-N70 HD-N70 Alkanes 10.82456 18.5064611 8.01949776 11.8079464 12.11834 Alkenes 0.667478 0.35487609 0.40965802 0.56750945 0.966381 Ketones 2.148265 3.64417485 0.49661068 0.97231369 1.369861 Esters 0.000319 0 0.00010261 0.00067655 0 Benzene series 3.613049 11.5563957 3.09128138 4.25210808 3.726298 Aldehydes 6.916408 9.48899743 1.32135936 2.66415471 5.952743 Inorganics 0.76 0.844 0.789 0.779 1.922

[0069] (3) Determine the GSOAV of each component according to OAV.

[0070] The odor activity value of each asphalt volatile matter calculated in step (1) was calculated, the component odor activity value sum of each component classified according to the chemical structure in step (2) was added, and the results were summarized in Table 2.

[0071] Table 2 Component odor activity value sum of each component of five kinds of asphalt

[0072] BJ-N90 SK-N90 Shell-N70 XA-N70 HD-N70 Alkanes 4.792846367 8.310925138 3.440147956 4.820315764 4.851371626 Alkenes 0 0 0 0 0 Ketones 0 0 0 0 0 Esters 0 0 0 0 0 Benzene series 495.8839282 1133.286988 496.1263965 611.286796 479.7571003 Aldehydes 4423.578872 5517.266572 746.8469816 1585.639938 4383.730109 Inorganics 1335.724534 1483.357245 1386.69297 1369.117647 3377.977044

[0073] wherein the calculation formula of the component odor activity value sum of each component is:

[0074]

[0075] In the formula, GSOAV represents the component odor activity value sum of each component, OAV represents the odor activity value of the asphalt volatile matter, i represents the number of the asphalt volatile matter, and i = 1, 2, 3,..., n. i wherein GSOAV represents the component odor activity value sum of each component, OAV represents the odor activity value of the asphalt volatile matter, i represents the number of the asphalt volatile matter, and i = 1, 2, 3,..., n.

[0076] (4) Determine GOT according to GC and GSOAV.

[0077] The component concentration of each component and the component odor activity value sum of each component obtained in steps (2) and (3) were calculated to obtain the component odor threshold value of each component of different asphalt.

[0078] wherein the calculation formula of the component odor threshold value of each component is:

[0079]

[0080] wherein GOT represents the component odor threshold value of each type of component, GSOAV represents the component odor activity value addition of each type of component, and GC represents the component concentration of each type of component.

[0081] After calculating the component odor threshold value of each type of component of different bitumens, only hydrogen sulfide in the volatile inorganic matter contributes to the odor of bitumen. Therefore, the correlation analysis of the concentration of the volatile inorganic matter only needs to consider the concentration of hydrogen sulfide, and finally the component odor threshold value of each type of component for the matrix bitumen is obtained, as shown in Table 3.

[0082] Table 3 Component odor threshold value of each type of component of five bitumens

[0083]

[0084] (5) Determine ASOAV according to GC and GOT.

[0085] Based on the component odor threshold value of each type of component of the matrix bitumen and the component concentration of each type of component, the approximate odor activity value addition of the five matrix bitumens is calculated, and the error analysis of the odor activity value of the five matrix bitumens is performed (Table 4), to verify the feasibility of the simplified evaluation method.

[0086] Table 4 Error analysis of the odor activity value of five bitumens

[0087] BJ-N90 SK-N90 Shell-N70 XA-N70 HD-N70 True value 6135.026 8953.022 2625.82 3603 7590.23 Approximate value 6260 8142.22 2633.2 3570 8246.316 Error 2.00％ 9.96％ 0.28％ -0.92％ 7.96％

[0088] wherein the calculation formula of the approximate odor activity value addition is:

[0089]

[0090] wherein ASOAV represents the approximate odor activity value addition, GC represents the component concentration of each type of component, GOT represents the component odor threshold value of each type of component, and i' represents the number of each type of component, i' = 1, 2, 3,..., n.

[0091] (6) Evaluate the odor characteristics of each matrix bitumen by the calculated ASOAV.

[0092] The higher the calculated approximate odor activity value is, the more serious the odor pollution degree is. Comparing the real odor activity value SOAV with the approximate odor activity value ASOAV, the odor pollution degree of the five matrix bitumens is consistent in the order. Therefore, the odor characteristics of the matrix bitumen can be evaluated by the bitumen odor characteristic evaluation method.

[0093] The asphalt peculiar smell characteristic evaluation method provided by the embodiment of the present application improves the process that the traditional evaluation method needs to qualitatively and quantitatively analyze the substance composition of the asphalt volatile substance, and more simply estimates the asphalt peculiar smell characteristic by analyzing the peculiar smell contribution component, the method is scientific and reasonable, and the calculation is simple, which is helpful for the evaluation of the peculiar smell characteristic of the asphalt pavement. On the other hand, the embodiment of the present application proposes the component peculiar smell threshold value, the component concentration and the approximate peculiar smell activity value addition, considers that different types of components classified according to the chemical structure have different peculiar smell contributions due to the different peculiar smell threshold values and concentrations, improves the practicability of the evaluation of the asphalt peculiar smell characteristic, and simplifies the evaluation of the asphalt peculiar smell characteristic.

Claims

1. A method for evaluating the odor characteristics of bitumen, characterized by, The method comprises the following steps: determining the odor activity values of various asphalt volatile substances; classifying the various asphalt volatile substances to obtain various components and determining the component concentrations of the various components; determining the component odor activity value sum of the various components according to the odor activity values of the various asphalt volatile substances; determining the component odor threshold values of the various components according to the component odor activity value sum and the component concentrations of the various components; evaluating the asphalt odor characteristics by using the approximate odor activity value sum according to the component odor threshold values and the component concentrations of the various components. ； The process of determining the component odor threshold values of the various components according to the component odor activity value sum and the component concentrations of the various components is as follows: wherein GOT represents the component odor threshold values of the various components, GSOAV represents the component odor activity value sum of the various components, and GC represents the component concentrations of the various components. ； wherein ASOAV represents the sum of the approximate off- flavor activity values, GC represents the component concentration of each component, GOT represents the component off- flavor threshold value of each component, represents the number of each component, ; The process of determining the approximate odor activity value sum according to the component odor threshold values and the component concentrations of the various components is as follows: The method for determining the odor activity values of various asphalt volatile substances comprises the following steps: determining the concentration values and the odor threshold values of the various asphalt volatile substances; determining the odor activity values of the various asphalt volatile substances according to the concentration values and the odor threshold values of the various asphalt volatile substances; ； wherein represents the odor activity value of the asphalt volatile substances, represents the concentration value of the asphalt volatile substances, represents the odor threshold value of the asphalt volatile substances, represents the quantity of the asphalt volatile substances, .

2. The method for evaluating the odor characteristics of bitumen according to claim 1, characterized by, The process of determining the odor activity values of the various asphalt volatile substances according to the concentration values and the odor threshold values of the various asphalt volatile substances is as follows: ； wherein GSOAV represents the sum of the component odour activity values of the various components, represents the odour activity value of the bitumen volatile matter, represents the quantity of bitumen volatile matter, .

3. The method for evaluating asphalt odor characteristics according to claim 1, characterized by, The process of determining the component odor activity value sum of the various components according to the odor activity values of the various asphalt volatile substances is as follows: The method for evaluating the asphalt odor characteristics by using the approximate odor activity value sum comprises the following steps:

4. A device for evaluating the characteristics of asphalt odor, characterized in that, determining the odor pollution situation according to the approximate odor activity value sum, and evaluating the asphalt odor characteristics based on the odor pollution situation. The method comprises the following steps: an odor activity value determination module, configured to determine the odor activity values of various asphalt volatile substances; a component concentration determination module, configured to classify the various asphalt volatile substances to obtain various components and determine the component concentrations of the various components; a component odor threshold value determination module, configured to determine the component odor activity value sum of the various components according to the odor activity values of the various asphalt volatile substances, and determine the component odor threshold values of the various components according to the component odor activity value sum and the component concentrations of the various components; an evaluation module, configured to determine the approximate odor activity value sum according to the component odor threshold values and the component concentrations of the various components, and evaluate the asphalt odor characteristics by using the approximate odor activity value sum. ； The process of determining the component odor threshold values of the various components according to the component odor activity value sum and the component concentrations of the various components is as follows: wherein GOT represents the component odor threshold values of the various components, GSOAV represents the component odor activity value sum of the various components, and GC represents the component concentrations of the various components. The process of determining the approximate odor activity value addition according to the component odor threshold value and the component concentration of each component is shown as follows: ； wherein ASOAV represents the sum of the approximate off- flavor activity values, GC represents the component concentration of each component, GOT represents the component off- flavor threshold value of each component, represents the number of each component, ; The odor activity value determination module is further configured to determine concentration values and odor threshold values of various asphalt volatile substances, and determine odor activity values of the various asphalt volatile substances according to the concentration values and odor threshold values of the various asphalt volatile substances. The process of determining the odor activity values of the various asphalt volatile substances according to the concentration values and odor threshold values of the various asphalt volatile substances is shown as follows: ； wherein represents the odor activity value of the asphalt volatile substance, represents the concentration value of the asphalt volatile substance, represents the odor threshold value of the asphalt volatile substance, represents the amount of the asphalt volatile substance, .

5. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the asphalt odor characteristic evaluation method according to any one of claims 1 to 3 when executing the program.

6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program implements the asphalt odor characteristic evaluation method according to any one of claims 1 to 3 when executed by the processor.

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