Method for evaluating selective adsorption of rubber powder to asphalt components and molecular groups

An evaluation method, the technology of rubber asphalt, applied in the direction of material separation, analysis of materials, preparation of test samples, etc., can solve the problem that it is difficult to quantitatively reveal the adsorption preference of rubber powder to asphalt components, cannot reflect the selective absorption of asphalt components, rubber Problems such as powder particle filtration and removal

Pending Publication Date: 2020-12-18
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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AI Technical Summary

Problems solved by technology

[0008] At present, when analyzing the influence of rubber powder particles on asphalt components, the rubber powder particles are not removed by filtration, but the rubber powder and asphalt are tested as a whole
Since the rubber powder particles are insoluble, when the traditional four-component method is used for...

Method used

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  • Method for evaluating selective adsorption of rubber powder to asphalt components and molecular groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Select No. 70 matrix asphalt sample, weigh 500g of the original asphalt, place it in a container and heat it to 160°C, select 20 mesh rubber powder (source A), use 20% of the dosage, add the rubber powder In asphalt, after high-speed shearing at a rate of 5000rpm for 60 minutes, swelling and development for 30 minutes to prepare rubber asphalt;

[0031] (2) Weigh 100g of the original asphalt and rubber asphalt respectively, heat the original asphalt to 160°C, and heat the rubber asphalt to 175°C, and maintain the temperature, put the two kinds of asphalt into ultra-fine round hole sieves (400 mesh, Stainless steel material), make it filter and elute under natural gravity for 24 hours to ensure that there is no free asphalt on the surface of the rubber particles in the experimental group; collect the asphalt under the sieve and weigh it to be tested, the original asphalt under the sieve is the control group, and the rubber asphalt under the sieve is the experiment Gr...

Embodiment 2

[0057] (1) Select No. 90 matrix asphalt sample, weigh 500g of the original asphalt, place it in a container and heat it to 160°C, select 40 mesh rubber powder (source B), use 50% of the dosage, add the rubber powder In asphalt, after high-speed shearing at a rate of 5000rpm for 60 minutes, swelling and development for 30 minutes to prepare rubber asphalt;

[0058] (2) Weigh 100g of original asphalt and rubber asphalt respectively, heat the original asphalt to 160°C, and rubber asphalt to 175°C, and maintain the temperature, place the two kinds of asphalt on a 400-mesh ultra-fine round hole sieve for gravity Filter and elute for 24 hours to ensure that there is no free asphalt on the surface of the rubber particles in the experimental group; collect the asphalt under the sieve and weigh it to be tested, the under-sieve of the original asphalt is the control group, and the under-sieve of the rubber asphalt is the experimental group;

[0059] (3) Take 10 mg of asphalt from the co...

Embodiment 3

[0086] Using the same method as in Examples 1 and 2, the difference is that the base asphalt sample in the step (1) is No. 50, and the rubber powder is 60 mesh (source C). Adopt asphalt four-component difference ratio and molecular weight difference ratio result of the present invention as shown in table 9 and 10:

[0087] Table 9 Difference ratio of four components of asphalt of the present invention

[0088] four components Saturation Aroma colloid Asphaltenes Component difference ratio / % 1.16 0.98 0.88 1.31

[0089] According to Table 9, according to the aforementioned evaluation criteria, it can be seen that:

[0090] ① The difference ratio of aromatic components is 0.99<1, indicating that the rubber powder in the experimental group has absorbed the aromatic components, and it is believed that the rubber powder has a preference for the absorption of aromatic components; the difference ratio of the colloidal components is 0.88<1, indicating t...

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Abstract

The invention discloses a method for evaluating selective adsorption of rubber powder to asphalt components and molecular groups. The method comprises the following steps: respectively heating original asphalt and rubber asphalt prepared from the original asphalt to a flowing state, pouring into ultrafine round-hole sieve pores, carrying out gravity filtration, collecting undersize asphalt, and weighing for later measurement; then, separating the asphalt into four components including asphaltene, a saturated component, an aromatic component and colloid by utilizing a rod-shaped thin-layer chromatography- hydrogen flame ion method, and calculating the proportion of the four components; then, respectively detecting and identifying the molecular weight of the asphalt by utilizing a gel permeation chromatography technology; and finally, quantitatively judging the adsorption degree of the rubber powder to the asphalt components according to the four components of the asphalt and the mass relationship between the molecular weight variation amplitude and the added rubber powder. In conclusion, the method is high in experiment precision, complete in maturity, easy to operate, high in speed, accurate in data, good in reproducibility, little in pollution and suitable for being universally applied to rubber asphalt research.

Description

technical field [0001] The invention belongs to the technical field of performance testing of modified asphalt, in particular to an evaluation method for selective adsorption of rubber powder on asphalt components and molecular groups. Background technique [0002] At present, the problems brought about by development are becoming more and more prominent, and the crisis of survival forces all countries in the world to face a series of problems such as environmental degradation and energy depletion brought about by economic development. The development of circular economy and the road of sustainable development have reached a consensus. Energy conservation and emission reduction have become the focus of widespread attention nowadays. The world has entered a "low-carbon era. With the rapid development of the transportation industry, the number of automobiles in The average growth rate is about 14.5%. It is estimated that by 2020, the number of cars in China will exceed 200 mil...

Claims

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Application Information

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IPC IPC(8): G01N30/90G01N30/02G01N30/14G01N1/34G01N1/40
CPCG01N30/90G01N30/02G01N30/14G01N1/34G01N1/4077G01N2001/4088
Inventor 谭华禤炜安王彬刘卫东张洪刚熊保林
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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