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Modified asphalt and application thereof

A technology of modified asphalt and asphalt, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of poor compatibility of asphalt, achieve the effects of reducing surface energy, improving adhesion, and improving anti-aging performance

Pending Publication Date: 2020-11-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-montmorillonite itself is a kind of hydrophilic material, which has poor compatibility with asphalt

Method used

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  • Modified asphalt and application thereof
  • Modified asphalt and application thereof
  • Modified asphalt and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Evenly disperse 10g NMMT in 1000ml ultrapure water at a high speed (the concentration of NMMT is 0.01g / ml), mechanical stirring is 500rpm, remove the lower layer of particles after standing, and get the upper layer suspension; the montmorillonite suspension is pre-frozen, pre- The freezing temperature is -20°C, and the pre-freezing time is 6 hours to fully freeze the suspension; vacuum freeze-dry the pre-frozen montmorillonite suspension to obtain freeze-dried NMMT.

[0060] Take 10 g of freeze-dried NMMT and add it to 200 mL of ultrapure water, and stir at room temperature for 1 h to fully destroy the clays in the dispersion medium. Use dilute hydrochloric acid solution to adjust the pH value of the suspension to 4-4.5, and continue stirring for 1 h. According to the aminosilane KH-550: NMMT mass ratio of 1:10, 2:10, 4:10, 6:10, 8:10, 12:10, add KH550 to the suspension, and the suspension is at 80 Under the condition of water bath at ℃, stir for 4h. The suspension wa...

Embodiment 2

[0067] (1) using the NH prepared in Example 1 2 -MMT 4 , Take 100 parts of asphalt and heat it to about 160 ° C ~ 180 ° C, and use melt blending method to mix 3 parts of NMMT or NH 2 -MMT 4 Add to the molten asphalt in several times, shear 120min at a shear rate of 5000r / min, make NMMT or NH 2 -MMT 4 Fully dispersed in molten asphalt. Then develop at 600r / min stirring speed for 90min to obtain NMMT-A and NH 2 -MMT 4 -A.

[0068] (2) Select Gr aggregates with a particle size of 13.2mm-19mm, ultrasonically clean the surface with water, and dry at 100°C for 9-10h until the quality does not change.

[0069] (3) Evaluate NMMT-A and NH according to the boiling method of T0616-1993 in "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" 2 -MMT 4 -A grade of adhesion to Gr aggregates.

[0070] The results of the boiling test showed that if Figure 5 (a), after the Gr aggregate was wrapped in NMMT-A, the asphalt film on the aggregate surface partially f...

Embodiment 3

[0080] (1) Take 100 parts of asphalt and heat it to about 160 ℃ ~ 180 ℃, and use melt blending method to mix 3 parts of NMMT or NH 2 -MMT 4 Add to the molten asphalt in several times, shear 120min at a shear rate of 5000r / min, make NMMT or NH 2 -MMT 4 Fully dispersed in molten asphalt. Then develop at 600r / min stirring speed for 90min to obtain NMMT-A, NH 2 -MMT 4 -A. According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011, the above two kinds of asphalts were respectively subjected to rotating film heating tests to obtain NMMT-A-RTFO, NH 2 -MMT 4 -A-RTFO.

[0081] (2) Select Gr aggregates with a particle size of 13.2mm-19mm, ultrasonically clean the surface with water, and dry at 100°C for 9-10h until the quality does not change.

[0082] (3) Evaluate NMMT-A-RTFO, NH 2 -MMT 4 - Adhesion rating of A-RTFO to Gr aggregates.

[0083] The results of the water boiling test showed that after the Gr aggregate was wrapped in ...

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Abstract

The invention discloses modified asphalt and application thereof. According to the invention, a freeze-drying method and aminosilane are utilized to modify nano montmorillonite, and the nano montmorillonite is added into asphalt as a single asphalt modifier, so that the dispersity and compatibility of montmorillonite and asphalt are effectively improved, and the cohesion of asphalt is enhanced. Inorder to further enhance the adhesive force between asphalt and acidic aggregate, aminosilane is adopted to modify the surface of the acidic aggregate, so that the surface energy of the aggregate isreduced, and the adhesive force between the asphalt and the aggregate is improved. Compared with matrix asphalt and granite aggregate, the method of bidirectional modification of single amino silane modified montmorillonite modified asphalt and modified aggregate has the advantages that the adhesion work is improved by 13%, and the peeling work is reduced by 23%. After the asphalt is aged for a short time, a bidirectional modification method is adopted, so that the adhesion performance of the asphalt and the aggregate is still obviously improved, the adhesion work is improved by 8%, the peeling work is reduced by 21%, and the water damage of an asphalt pavement can be effectively relieved.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for modifying asphalt, in particular to a method for improving the interface adhesion between modified asphalt and aggregates. Background technique [0002] During the service of asphalt pavement, various pavement diseases, such as water damage, will occur, especially in the rainy areas in southern China. The main cause of water damage to asphalt pavement is the reduction of the adhesion between asphalt and aggregates. There are two mechanisms for its reduction: one is that the cohesion of the asphalt is insufficient or the asphalt is aged due to the influence of the environment, which weakens the cohesion of the asphalt, causing the asphalt mixture to peel off from the inside of the asphalt phase; the other is the adhesion between the asphalt and the aggregate. Insufficient strength. Because the effect of aggregate and water is greater than that of asphalt, t...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K9/06C08K9/00C08K3/34C08K7/00C04B20/02C04B26/26C04B24/42C04B14/14C04B14/28C04B14/06C04B14/04
CPCC08K9/06C08K9/00C08K3/346C08K7/00C04B20/023C04B26/26C04B24/425C04B2111/0075C08K2201/011C08L95/00C04B14/14C04B14/28C04B14/048C04B14/06C04B14/04
Inventor 梁波张宽宽石凯郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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