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Preparation method for improving asphalt performance by using coal direct liquefaction residue
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A technology of direct coal liquefaction and modified asphalt, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of high price, increased cost of asphalt, and the inability to correctly judge the effect of asphalt low-temperature improvement, and achieve good compatibility, The effect of improving performance
Active Publication Date: 2018-03-27
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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At the same time, the price of polymer modifiers such as SBS, SBR, EVA and PE is relatively high, which will easily lead to a substantial increase in the cost of asphalt
[0006] Zhu Weiping studied the influence of the addition amount of direct coal liquefaction residue, compounding process and compounding temperature on the performance of asphalt in the article "Research on Modified Bitumen by Direct CoalLiquefaction Residue", but the ductility at 25°C was used, which is different from " Highway asphalt pavement construction technical specification (JTG F40-2004) does not conform to the low temperature performance index (5°C ductility) of modified asphalt, so it is impossible to judge the improvement effect of coal direct liquefaction residue on the low temperature performance of asphalt
[0007] Wang Zhaixia et al. studied the influence of different coal direct liquefaction residues on the performance of asphalt at the addition of 7% in the article "Preliminary Evaluation of Coal Direct Liquefaction Residues on Road Asphalt Modification", but the 25°C ductility was still used. , which is inconsistent with the low-temperature performance index (5°C ductility) of modified asphalt in the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), so it is impossible to judge the improvement effect of the direct coal liquefaction residue on the low-temperature performance of asphalt
[0008] In a word, in the existing studies on the direct coal liquefaction residue as a modifier to improve the performance of asphalt, most of the indicators used to reflect the low temperature performance of asphalt are incorrect, and it is impossible to correctly judge the low temperature improvement effect of the direct coal liquefaction residue on asphalt
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Embodiment 1
[0023] Step 1: Test the technical indicators of coal direct liquefaction residue and rubber oil, the results are shown in Table 1 and Table 2.
[0024] Table 1. Performance indicators of coal direct liquefaction residue
[0025]
[0026]
[0027] TFOT residue (163°C, 5h)
[0028]
[0029] It can be seen from Table 1 that the ash content of the coal direct liquefaction residue is less than 10%.
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Abstract
The invention relates to a preparation method for improving asphalt performance by using coal direct liquefaction residue, and belongs to the field of road petroleumasphaltengineering. The invention is suitable for adding 5-10% of granular coal direct liquefaction residue and 2-3% rubber oil into base asphalt, and stirring at high temperature (150-160°C), thereby preparing direct coalliquefaction with excellent performance and low price Residue modified bitumen to increase the added value of coal direct liquefaction residue. Since coal direct liquefaction residue, rubber oil and petroleum asphalt belong to the same substance, they have good compatibility and will not segregate. At the same time, the price of using coal direct liquefaction residue to improve asphalt performance is far lower than that of traditional SBS modified asphalt Price, therefore, the present invention is a kind of economical and practical technical method.
Description
technical field [0001] The invention relates to a preparation method for improving asphalt performance by using coal direct liquefaction residue, in particular to a preparation method for improving asphalt performance by adding coal direct liquefaction residue to asphalt. Background technique [0002] Coal direct liquefaction is at high temperature (above 400°C) and high pressure (above 10MPa), under the action of catalysts and solvents, the molecules of coal are cracked and hydrogenated, directly converted into liquid fuels, and then further refined into gasoline, diesel and other fuels Oil, also known as hydrogenated liquefaction. In the process of direct coal liquefaction, 30% of by-products—residues are produced, that is, residues of direct coal liquefaction. [0003] The composition and properties of coal direct liquefaction residue depend on the type of coal used for liquefaction, liquefaction process conditions, and solid-liquid separation method. The decisive factor...
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