Method for evaluating storage stability of blended petroleum asphalt

Abstract

According to the method for evaluating the storage stability of the blended petroleum asphalt, provided by the invention, based on an asphalt evaporation loss test, the penetration and the density under a specific sampling condition are detected, the detection time is shortened, indexes with relatively small detection errors are selected for detection and analysis, and the detection efficiency and the accuracy of the evaluation method are improved. Through the combination of the penetration ratio and density ratio indexes under two treatment modes after the heating loss test of the asphalt product, the operation is simple and convenient, and it is convenient to judge whether the petroleum asphalt is high-quality blended asphalt or not by adopting conventional means in a laboratory. According to the method provided by the invention, whether the asphalt product is the high-quality blended petroleum asphalt can be quickly and simply identified, and when the change value of the two-time needle penetration is less than or equal to 100 + / -5% and the change value of the two-time density is less than or equal to 100 + / -2%, the asphalt sample can be judged to be the blended asphalt with excellent storage stability.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt, and in particular relates to a method for evaluating the storage stability of blended petroleum asphalt. Background Art

[0002] With the rapid development of my country's economy, the mileage of high-grade highways has also increased rapidly, so the quality requirements for road asphalt have become higher and higher. Heavy traffic road asphalt has the characteristics of high softening point, excellent performance, good thermal stability, etc., and is widely used in the construction of high-grade highways and airport runways. The production methods of asphalt include atmospheric and vacuum distillation, oxidation, solvent deasphalting, blending, etc.

[0003] The blending method of producing asphalt mainly refers to referring to the four components of asphalt as the basis for blending, and recombining the components according to the quality requirements of asphalt to produce asphalt. It can use the refined products of the same source crude oil as the blending raw materials, or the residues or components of the primary and secondary processing of the same source crude oil or other source crude oils and various industrial distillates as the blending components. This reduces the dependence on oil sources in asphalt manufacturing and expands the source of raw materials for asphalt manufacturing. The superiority and flexibility shown by the blending method are increasingly valued by various manufacturers. The blending method can be used to produce asphalt according to the properties of the raw materials and the quality requirements of the products, and a single asphalt production process or a combination of several asphalt production processes can be selected.

[0004] The general raw materials for blending asphalt include the following: 1) petroleum asphalt, which is obtained from crude oil by atmospheric and vacuum distillation and is one of the main raw materials for blending asphalt; 2) petroleum asphalt of different ductility and penetration levels. By mixing petroleum asphalts of different properties in a certain proportion, blending asphalts with different properties can be prepared; 3) vacuum residue, which is the remaining product in the crude oil refining process and can be obtained through shallow oxidation or propane deasphalting process; 4) furfural extracted oil, which is also a product of crude oil refining process and is sometimes added to asphalt for blending; 5) natural asphalt, which is asphalt existing in nature and can be used directly or mixed with other types of asphalt; 6) coal tar asphalt, which is a kind of asphalt obtained by coal distillation and has good thermal stability and electrical insulation. In addition, when preparing blending asphalt, appropriate raw materials and proportions will be selected according to the required performance parameters, and the appropriate stirring time will be determined to ensure that the performance of the final product meets the specific application requirements.

[0005] When blending asphalt, it is necessary to conduct strict component control and adaptability experiments on the blending components. When the compatibility of the components is poor and inappropriate components are selected, many problems will occur during the use of the blended petroleum asphalt products: 1) Environmental issues. A large amount of harmful substances will be produced during the production and use of asphalt, causing serious pollution to the environment; 2) Poor durability. Compared with atmospheric and vacuum petroleum asphalt, when inappropriate components are selected for blending asphalt, it will lead to poor durability and short service life; 3) Poor adhesion. When the blending components of blending asphalt are not suitable, the asphalt product will have poor adhesion and weak bonding with aggregates, which can easily lead to early damage to the road surface; 4) High and low temperature performance defects. The high temperature stability and low temperature crack resistance of blending asphalt are not as good as those of atmospheric and vacuum petroleum asphalt; 5) Construction difficulty. When the blending components of blending asphalt are not suitable, it will lead to unstable viscosity. When the viscosity is large, the construction difficulty is greater.

[0006] After long-term storage, petroleum asphalt products prepared by the blending asphalt process will have stratification of different blending components, which is specifically manifested in the large difference in asphalt indicators between the upper and lower layers of the storage tank. Therefore, providing a highly accurate detection method for early identification of whether petroleum asphalt is blended with components with poor compatibility can prevent inferior products from entering the road asphalt market from the source, improve the level of road quality control from the asphalt material end, reduce the occurrence of road diseases, and reduce the cost of road maintenance in the later stage. Summary of the invention

[0007] The object of the present invention is to provide a method for evaluating the storage stability of blended petroleum asphalt. The method of the present invention can identify the storage stability of blended petroleum asphalt in advance, and has high detection efficiency and good accuracy.

[0008] The present invention provides a method for evaluating the storage stability of blended petroleum asphalt, comprising the following steps:

[0009] A) Injecting the asphalt sample into the sample container to conduct an asphalt evaporation loss test to obtain an asphalt sample;

[0010] B) performing a needle penetration test and a density test on the asphalt sample;

[0011] The needle penetration test comprises the following steps:

[0012] The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the needle penetration index of the residue at 25°C is detected, which is P1;

[0013] Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. The needle penetration index of the residue at 25°C is P2;

[0014] Calculate the 25℃ needle penetration index ratio P1 / P2;

[0015] The density detection comprises the following steps:

[0016] The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the density index of the residue at 15°C is detected and recorded as ρ1;

[0017] Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. Take a sample from the upper layer to test the density index of the residue at 15°C, which is recorded as ρ2;

[0018] Calculate the density index ratio ρ1 / ρ2 at 15℃;

[0019] C) The 25°C needle penetration index ratio P1 / P2 is within the range of 100±5%, and the 15°C density index ratio ρ1 / ρ2 is within the range of 100±2%, which determines that the storage stability of the blended petroleum asphalt is excellent.

[0020] Preferably, the asphalt evaporation loss test is carried out according to the method in test procedure T0608-2011.

[0021] Preferably, the needle penetration index of the residue at 25°C is tested according to the method in test specification T0604-2011.

[0022] Preferably, the 15°C density index of the residue is tested according to the method in test procedure T0607-2011.

[0023] Preferably, in the needle penetration test, 2 to 5 sample containers containing asphalt samples are taken and stirred evenly up and down, and then cooled naturally, and the needle penetration index of the residue at 25°C is tested respectively and the average value is taken and recorded as P1;

[0024] Take another 2 to 5 sample containers containing asphalt samples and keep them in their original state to cool naturally. Test the 25℃ needle penetration index of the residues respectively and take the average value, which is recorded as P2.

[0025] Preferably, in the density test, 2 to 5 sample containers containing asphalt samples are taken and stirred evenly up and down, and then cooled naturally, and the density index of the residue at 15°C is tested respectively and the average value is taken, which is recorded as ρ1;

[0026] Take another 2 to 5 sample containers containing asphalt samples and keep them in their original state to cool naturally. Take samples from the upper layer to test the density index of the residue at 15℃ and then take the average value, which is recorded as ρ2.

[0027] Preferably, the mass of the asphalt sample in the sample container is 40-60 g.

[0028] The present invention provides a method for evaluating the storage stability of blended petroleum asphalt. The method of the present invention is based on the asphalt evaporation loss test, and detects the penetration and density under specific sampling conditions, shortens the detection time, and selects indicators with smaller detection errors for detection and analysis, thereby improving the detection efficiency and accuracy of the evaluation method. By combining the penetration ratio and density ratio indicators under two treatment methods after the heating loss test of the asphalt product, the operation is simple and convenient, and it is convenient to use conventional means in the laboratory to make a judgment on whether the petroleum asphalt is a high-quality blended asphalt. The method provided by the present invention can quickly and simply identify whether the asphalt product is a high-quality blended petroleum asphalt. When the change in the penetration twice is ≤100±5%, and the change in the density twice is ≤100±2%, the asphalt sample can be determined to be a blended asphalt with excellent storage stability. DETAILED DESCRIPTION

[0029] The present invention provides a method for evaluating the storage stability of blended petroleum asphalt, comprising the following steps:

[0030] A) Injecting the asphalt sample into the sample container to conduct an asphalt evaporation loss test to obtain an asphalt sample;

[0031] B) performing a needle penetration test and a density test on the asphalt sample;

[0032] The needle penetration test comprises the following steps:

[0033] The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the needle penetration index of the residue at 25°C is detected, which is P1;

[0034] Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. The needle penetration index of the residue at 25°C is P2;

[0035] Calculate the 25℃ needle penetration index ratio P1 / P2;

[0036] The density detection comprises the following steps:

[0037] The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the density index of the residue at 15°C is detected and recorded as ρ1;

[0038] Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. Take a sample from the upper layer to test the density index of the residue at 15°C, which is recorded as ρ2;

[0039] Calculate the density index ratio ρ1 / ρ2 at 15℃;

[0040] C) The 25°C needle penetration index ratio P1 / P2 is within the range of 100±5%, and the 15°C density index ratio ρ1 / ρ2 is within the range of 100±2%, which determines that the storage stability of the blended petroleum asphalt is excellent.

[0041] In the present invention, asphalt samples are prepared according to the asphalt sample preparation method in the asphalt evaporation loss test of specification T0608-2011, and n groups of samples are prepared using a needle penetration bowl as a sample holder during the evaporation loss test. 50g±0.5g of asphalt is poured into each group, and the properties are tested after a 5h evaporation loss test.

[0042] In the present invention, n is preferably an integer ≥8, and more preferably any integer between 8 and 20.

[0043] In the present invention, the property tests are 25°C needle penetration test and 15°C density test, and the two tests are performed in no particular order.

[0044] The present invention takes 2 to 5 sample containers, stirs them evenly up and down, and then cools them down. The 25°C needle penetration index of the residue is respectively detected by the T0604-2011 method, and the average value P1 is calculated; another 2 to 5 sample containers are kept in the original state and naturally cooled down. The 25°C needle penetration index of the residue is respectively detected by the T0604-2011 method, and the average value P2 is calculated; and the 25°C needle penetration index ratio P1 / P2 is calculated.

[0045] The present invention takes 2 to 5 sample containers and stirs them evenly from top to bottom, and adopts the T0607-2011 method to respectively detect the 15°C density index ρ1 of the residue; takes samples from the upper layers of another 2 to 5 sample containers, adopts the T0604-2011 method to respectively detect the 15°C density index of the residue, and calculates the average value ρ2; and calculates the 15°C density index ratio ρ1 / ρ2.

[0046] When the 25°C needle penetration ratio of the detected residual asphalt is 100±5%, and the 15°C density index ratio is 100±2%, it indicates that the component structure of the petroleum asphalt sample is stable and the storage stability is excellent.

[0047] The method of the present invention is based on the standard test procedures and conventional index detection and analysis of petroleum asphalt. It combines the penetration ratio and density ratio indicators under two specific treatment methods after the heating loss test of the asphalt product. The operation is simple and convenient, and it is convenient to use conventional means in the laboratory to quickly evaluate the storage stability of blended petroleum asphalt and determine whether to select appropriate blending components.

[0048] In order to further illustrate the present invention, a method for evaluating the storage stability of blended petroleum asphalt provided by the present invention is described in detail below in conjunction with examples, but it should not be construed as limiting the scope of protection of the present invention.

[0049] Example 1

[0050] 1) Take straight-run No. 70 asphalt from the atmospheric and vacuum unit. According to the test procedures T0604-2011 and T0607-2011, test the 25℃ needle penetration index and 15℃ density index of the original asphalt respectively;

[0051] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0052] 3) Take two sample containers while hot, stir them up and down evenly, then cool them down. Use T0604-2011 method to test the 25℃ needle penetration index of the residue respectively, and calculate the average value P1; take two sample containers and keep them in the original state and cool them naturally. Use T0604-2011 method to test the 25℃ needle penetration index of the residue respectively, and calculate the average value P2; and calculate the 25℃ needle penetration index ratio P1 / P2.

[0053] 4) Take two sample containers while hot and stir them evenly from top to bottom. Use T0607-2011 method to test the 15℃ density index ρ1 of the residue respectively; take samples from the upper layers of the two sample containers while hot and use T0604-2011 method to test the 15℃ density index of the residue respectively, and calculate the average value ρ2; and calculate the 15℃ density index ratio ρ1 / ρ2.

[0054] Example 2

[0055] 1) Take straight-run No. 90 asphalt from the atmospheric and vacuum unit. According to the test procedures T0604-2011 and T0607-2011, test the 25℃ needle penetration index and 15℃ density index of the original asphalt respectively;

[0056] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0057] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0058] Example 3

[0059] 1) Use atmospheric and vacuum residue oil, straight-run No. 70 asphalt, furfural extracted oil, etc. to adjust the product penetration to 72dmm according to appropriate proportions. According to the test procedures T0604-2011 and T0607-2011, the 25℃ penetration index and 15℃ density index of the original asphalt are tested respectively;

[0060] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0061] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0062] Example 4

[0063] 1) Use atmospheric and vacuum residue oil, straight-run No. 70 asphalt, furfural extracted oil, etc. to adjust the product penetration to 87dmm according to appropriate proportions. According to the test procedures T0604-2011 and T0607-2011, the 25℃ penetration index and 15℃ density index of the original asphalt are tested respectively;

[0064] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0065] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0066] Example 5

[0067] 1) Use vacuum residue, a chemical heavy fraction, Indonesian natural asphalt, etc. to adjust the product penetration to 68dmm according to appropriate proportions. According to the test procedures T0604-2011 and T0607-2011, the 25℃ penetration index and 15℃ density index of the original asphalt are tested respectively;

[0068] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0069] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0070] Example 6

[0071] 1) Use vacuum residue, a chemical heavy fraction, Indonesian natural asphalt, etc. to adjust the product penetration to 89dmm according to appropriate proportions. According to the test procedures T0604-2011 and T0607-2011, the 25℃ penetration index and 15℃ density index of the original asphalt are tested respectively;

[0072] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0073] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0074] Example 7

[0075] 1) Use atmospheric and vacuum residue, straight-run No. 70 asphalt, a chemical heavy fraction, etc. to adjust the product penetration to 71dmm according to appropriate proportions. According to test procedures T0604-2011 and T0607-2011, the 25℃ penetration index and 15℃ density index of the original asphalt are tested respectively;

[0076] 2) Prepare asphalt samples according to the asphalt sample preparation method in the asphalt evaporation loss test in Regulation T0608-2011, and inject 50g±0.5g into 8 needle penetration containers respectively; after the evaporation loss test, the 8 containers are sampled according to the following specific method.

[0077] 3) Perform index detection and data processing according to the subsequent steps of Example 1.

[0078] Verification Example

[0079] The asphalt products in Examples 1 to 6 were respectively used to prepare separation tube samples according to the sample preparation method in the polymer modified asphalt separation test in Regulation T0661-2011. After the separation tubes completed 48 hours of oven storage and 4 hours of freezer storage, the separation softening point difference test was performed according to the test steps in T0661-2011.

[0080] Comparative Example 1

[0081] The asphalt products in Examples 1 to 6 were respectively used to prepare separation tube samples according to the sample preparation method in the polymer modified asphalt separation test in Regulation T0661-2011. After the separation tubes completed 5 hours of oven storage and 4 hours of freezer storage, the separation softening point difference test was performed according to the test steps in T0661-2011.

[0082] Comparative Example 2

[0083] 1) Prepare the samples after step 1) and step 2) in Examples 1 to 6 according to the following specific method.

[0084] 2) Take two sample containers while hot, stir them up and down evenly, then cool them down, and use T0605-2011 method to test the softening point index of the residue respectively, and calculate the average value Sp1; take two upper layer samples from the two sample containers while hot, and use T0605-2011 method to test the softening point index of the residue respectively, and calculate the average value Sp2; and calculate the difference in softening point index.

[0085] The test results of Examples 1 to 6, the verification examples and the comparative examples are shown in Table 1.

[0086] Table 1 Test results of petroleum asphalt in Examples 1 to 6, verification examples and comparative examples of the present invention

[0087]

[0088] By comparison with the above embodiments, the determination results of the method of the present invention and the traditional separation tube method are consistent; when the test time of the verification example is shortened and the samples in Examples 1 to 6 are tested, there is no obvious difference in the indicators in the results of Example 1, and the quality difference of the blended asphalt cannot be judged; when the softening point index is used to test the samples in Examples 1 to 6, there is no obvious difference in the indicators in the results of Example 2, and the quality difference of the blended asphalt cannot be judged; this method can be used to quickly evaluate the storage stability of different types of blended petroleum asphalt in the examples, and clearly distinguish the quality difference of the blended petroleum asphalt. The above verification and comparison show that this method can effectively shorten the evaluation time and maintain the accuracy of the determination results.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for evaluating the storage stability of blended petroleum asphalt, comprising the following steps: A) Injecting the asphalt sample into the sample container to conduct an asphalt evaporation loss test to obtain an asphalt sample; B) performing a needle penetration test and a density test on the asphalt sample; The needle penetration test comprises the following steps: The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the needle penetration index of the residue at 25°C is detected, which is P1; Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. The needle penetration index of the residue at 25°C is P2; Calculate the 25℃ needle penetration index ratio P1 / P2; The density detection comprises the following steps: The asphalt sample in the sample container obtained in step A) is stirred evenly up and down and then cooled naturally, and the density index of the residue at 15°C is detected and recorded as ρ1; Take another asphalt sample in the sample container obtained in step A) and keep it in its original state and cool it naturally. Take a sample from the upper layer to test the density index of the residue at 15°C, which is recorded as ρ2; Calculate the density index ratio ρ1 / ρ2 at 15℃; C) The 25°C needle penetration index ratio P1 / P2 is within the range of 100±5%, and the 15°C density index ratio ρ1 / ρ2 is within the range of 100±2%, which determines that the storage stability of the blended petroleum asphalt is excellent.

2. The method according to claim 1, characterized in that The asphalt evaporation loss test was carried out according to the method in test procedure T0608-2011.

3. The method according to claim 1, characterized in that The needle penetration index of the residue at 25°C was tested according to the method in test procedure T0604-2011.

4. The method according to claim 1, characterized in that: The density index of the residue at 15°C was tested according to the method in test procedure T0607-2011.

5. The method according to claim 1, characterized in that In the needle penetration test, take 2 to 5 containers containing asphalt samples, stir them up and down evenly, and then cool them naturally. The needle penetration index of the residue at 25℃ is tested respectively and the average value is taken, which is recorded as P1; Take another 2 to 5 sample containers containing asphalt samples and keep them in their original state to cool naturally. Test the 25℃ needle penetration index of the residues respectively and take the average value, which is recorded as P2.

6. The method according to claim 1, characterized in that In the density test, take 2 to 5 sample containers containing asphalt samples, stir them up and down evenly, and then cool them naturally. The density index of the residue at 15℃ is tested respectively and the average value is taken, which is recorded as ρ1; Take another 2 to 5 sample containers containing asphalt samples and keep them in their original state to cool naturally. Take samples from the upper layer to test the density index of the residue at 15℃ and then take the average value, which is recorded as ρ2.

7. The method according to claim 1, characterized in that The mass of the asphalt sample in the sample container is 40-60 g.

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