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Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof

A technology of modified asphalt and styrene-butadiene rubber, which is applied in the field of warm-mix styrene-butadiene rubber modified asphalt mixture and its preparation, can solve the problems of poor storage stability and cumbersome preparation methods, reduce smoke, simplify preparation methods, and solve The effect of technical barriers

Active Publication Date: 2011-03-02
厦门华特公路沥青技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the cumbersome preparation method of the existing styrene-butadiene rubber modified asphalt and the need to use special modified asphalt equipment, and the sales of finished modified asphalt are limited by transportation distance and poor storage stability. , provides a preparation method of styrene-butadiene rubber modified asphalt mixture, in this preparation method, no special asphalt modification equipment is needed, and the direct injection method is used to add styrene-butadiene rubber latex to the asphalt mixture, and the specially adopted The mixture warm mixing technology can save energy and reduce emissions, delay the cooling speed of the mixture, make the final mixture suitable for construction in cold areas, prolong the construction time of asphalt pavement in this area, expand the scope of construction, etc.

Method used

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  • Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof
  • Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof
  • Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The base asphalt used in this example is Liaohe No. 90 asphalt, and its technical index measurement results are shown in Table 1. The styrene-butadiene latex is PC-1725G, a product of Shanghai Longfu Industrial Co., Ltd., and its physical properties are shown in Table 2. The warm mixing agent is selected from the products of Medwishvik For DAT-H5, see Table 3 for its technical specifications.

[0020] The aggregate is Anshan limestone with AC-13I type gradation. The dosage of base asphalt is 4.6% of aggregate and base asphalt mass. The target grading is shown in Table 4.

[0021] Table 1 Liaohe asphalt performance test results

[0022]

[0023] Table 2 PC-1725G physical properties

[0024]

[0025] Table 3 DAT-H5 technical indicators

[0026]

[0027] Table 4 Target Grading

[0028]

[0029] 1. Evaluate the performance of the mixture in the laboratory. The indoor mixing process is as follows: heat the base asphalt to 150°C, heat the aggregate to 130°...

Embodiment 2

[0038] The aggregates used in this example, the warm mix agent and the gradation of the prepared asphalt mixture are all the same as those in Example 1. Shell No. 90 asphalt is selected as the base asphalt, and its technical index measurement results are shown in Table 6. The amount of the base asphalt is 4.6% of the mass of aggregate and base asphalt. The styrene-butadiene latex is selected from PC-1745, a product of Shanghai Longfu Industrial Co., Ltd., and its physical properties are shown in Table 7.

[0039] Table 6 Shell asphalt performance test results

[0040]

[0041] Table 7 PC-1745 Physical Properties

[0042] Performance

traits or indicators

Physical form 25℃

Milky white liquid

Emulsifier Properties

anion

Density (g / cm 3 )

0.94

Flash point, (°C)

149

pH value, 15% (w / v) in water

10.4

Solid content, %

70-72

[0043] 1. Evaluate the performance of the mixture in the labora...

Embodiment 3

[0052] The gradation of base asphalt, aggregates, warm mix agent and prepared asphalt mixture used in this example is the same as that in Example 1. The consumption of base bitumen is also with embodiment 1. The styrene-butadiene latex is selected from PC-1715, a product of Shanghai Longfu Industrial Co., Ltd., and its physical properties are shown in Table 9.

[0053] Table 9PC-1715 Physical Properties

[0054]

[0055] 1. Evaluate the performance of the mixture in the laboratory. The indoor mixing process is as follows: heat the base asphalt to 150°C, heat the aggregate to 130°C, mix the two at 140°C for 60 seconds, add 5% (relative to the base asphalt mass percentage) of styrene-butadiene latex PC-1715 at 140°C for 60 seconds, then add 5% (relative to the mass percentage of base asphalt) of warm mix agent DAT-H5 and mix at 140°C for 60 seconds, and finally add 6% Mineral powder (Anshan limestone with a particle size of 0.075mm or less, the percentage relative to the ag...

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Abstract

The invention discloses a method for preparing a styrene butadiene rubber modified bituminous mixture. The method comprises the following steps: mixing aggregate and matrix bitumen at 130 to 150 DEG C for 8 to 60 s; adding styrene butadiene latex and mixing for 10 to 60 s; adding a warm mixing agent and mixing for 6 to 60 s; and adding mineral powder and mixing for 6 to 60 s to obtain the styrenebutadiene rubber modified bituminous mixture. The invention overcomes the defects that the conventional method for preparing styrene butadiene rubber modified bitumen is complicated, special modifiedbitumen equipment is required, the marketing of the finished product of modified bitumen is limited by the transportation distance, the storage stability is low and the like, does not need special bitumen modification equipment and adds the styrene butadiene latex into the bituminous mixture in a direct way; and the particularly adopted mixture warm-mixing technology has functions of energy conservation and emission reduction and delays the temperature reduction speed of the mixture so that the finally obtained mixture is applicable to the construction in cold areas, the construction time of the bituminous pavement in the areas can be prolonged, the construction range can be expanded, etc.

Description

technical field [0001] The invention relates to a styrene-butadiene rubber modified asphalt mixture and a preparation method thereof, in particular to a warm-mix styrene-butadiene rubber modified asphalt mixture suitable for climate conditions in cold regions and a preparation method thereof. Background technique [0002] Paving asphalt pavement in cold regions (including cold northern regions and plateaus or high-altitude mountainous areas in my country) requires high temperature stability, low temperature crack resistance, water stability and fatigue performance of asphalt binder. Styrene-butadiene rubber (SBR) modified asphalt is a commonly used asphalt binder in cold regions of my country. At present, the production process of SBR modified asphalt is a pre-mixing process, that is, the styrene-butadiene latex (SBR) powder is mixed into the hot matrix asphalt in a certain proportion through a special modified asphalt equipment, and the shear pump or colloid mill is used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
Inventor 王伟吴剑夏余辉
Owner 厦门华特公路沥青技术有限公司
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