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Thick-layer spreading cold mixing large gap emulsified asphalt mixture and design method thereof

A technology of emulsified asphalt and design method, applied in computing, chemical informatics, computational theoretical chemistry, etc., can solve the problems of easy aging of asphalt, affecting road performance of large void pavement, and rapid cooling

Inactive Publication Date: 2017-07-14
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also limitations in the existing large void pavement: 1) because water can pass freely in the pavement void, this has just caused the asphalt of this type of pavement to age more easily, and the optimum asphalt dosage (or the optimum emulsified asphalt dosage) The selection and gradation design of the pavement has become the focus and difficulty; 2) This type of pavement cools down quickly during the construction process, which puts forward higher requirements for the construction process (such as construction temperature)
These limitations have seriously affected the road performance of large void pavement

Method used

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  • Thick-layer spreading cold mixing large gap emulsified asphalt mixture and design method thereof
  • Thick-layer spreading cold mixing large gap emulsified asphalt mixture and design method thereof
  • Thick-layer spreading cold mixing large gap emulsified asphalt mixture and design method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this embodiment, the gradation design with target porosity of 22%, 25%, and 28% is taken as an example to introduce the gradation design of the present invention based on the CAVF method. According to the gradation characteristics of the matrix emulsified asphalt mixture, the present invention adopts the broken gradation. The coarse aggregate selects two aggregates with a particle size of 13.2~9.5mm and 9.5~4.75mm, and the fine aggregate selects a particle size of 2.36~ 1.18mm aggregate.

[0063] The void ratio of the main aggregate is an important parameter designed in the CAVF method. According to the relevant method of the "Highway Engineering Aggregate Test Regulations" (JTGE42-2005), the relevant physical indicators of the coarse and fine aggregates and mineral powder are measured, and the relevant physical indicators of the coarse and fine aggregates and mineral powder are measured according to the formula (1 -2) Calculate the void ratio of the main aggregate. Th...

Embodiment 2

[0085] This example provides a formula when the target porosity of the matrix emulsified asphalt mixture is 7%-30%, as shown in Table 9.

[0086] Table 9: Formula of base emulsified asphalt mixture with target air void ratio of 7% to 30%

[0087]

[0088] The emulsified asphalt used in this embodiment is a high solid content emulsified asphalt with a solid content of 70%. The standard viscosity of the high consistency emulsified asphalt is 22.6 Pa·s. The preparation method of the emulsified asphalt is as follows:

[0089] (1) Prepare raw materials in proportion to the formula:

[0090] The emulsifier is selected from France CECA-PC-30; the base bitumen is selected from TOPCO 70# heavy traffic asphalt; the water selection standard is colorless, odorless, clean and free of impurities, pH value: 6~8.5, hardness ≯ 8 degrees; auxiliary material selection PVA (polyvinyl alcohol), CaCl 2 , Hydrochloric acid; the formula is shown in Table 10 below.

[0091] Table 10 Formula of high consistency...

Embodiment 3

[0098] This example provides a preparation method of the matrix emulsified asphalt mixture of Example 2:

[0099] (1) Prepare aggregate, mineral powder, emulsified asphalt and water according to the above formula of matrix emulsified asphalt mixture;

[0100] (2) Mix the coarse and fine materials well and then add water to moisten them, then add emulsified asphalt and mix for 60 seconds, and finally add mineral powder and mix quickly until the mixture becomes brown;

[0101] (3) Put the mixture into the test mold, compact 25 times on the upper and lower sides, cure for 24 hours at a certain temperature (25°C and 110°C), and then compact 25 times on the upper and lower sides, and finally cool and demold.

[0102] This example provides the effect test of the matrix emulsified asphalt mixture of Example 2

[0103] (1) Early and late strength

[0104] The test refers to the North American standards and takes the specimens cured under certain conditions, and the strength at a certain temperat...

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Abstract

The invention discloses a thick-layer spreading cold mixing large gap emulsified asphalt mixture and a design method thereof, and belongs to the technical field of a modern pavement. Based on a mineral aggregate main aggregate void volume filling method, use amount of mineral powders, thick and fine aggregates and mineral powders is calculated, optimal liquid use amount is preliminarily determined through wrapping and covering tests and mixing tests, and optimal asphalt amount, optimal emulsified asphalt, and optimal adding water mixing amount are finally determined through a Marshall test. The target void content of the emulsified asphalt mixture is 7%-30%. Through the design method, the emulsified asphalt mixture used for a matrix layer of a semi-flexible pavement, and each layer of a drainage pavement and a porous pavement can be manufactured. The cold mixing emulsified asphalt mixture and a large gap pavement are combined, and a paving effect of a hot mixing asphalt pavement can be achieved. The emulsified asphalt mixture is energy saving and environmentally friendly, and aging degree of the emulsified asphalt mixture in a construction is reduced.

Description

Technical field [0001] The invention belongs to the technical field of modern pavements, and particularly relates to a thick-layer paving cold-mix large-void emulsified asphalt mixture and a design method thereof. Background technique [0002] At present, most of the base asphalt mixture of traditional asphalt pavement materials adopts hot mixing and hot paving technology. When mixing, both asphalt and mineral materials need to be heated to a higher temperature, which consumes a lot of energy and pollutes the environment; at the same time, it will cause certain damage to the health of operators. Degree of harm. In addition, long-term high-temperature mixing will make asphalt harden due to aging, resulting in a decrease in asphalt cohesive force, thereby affecting all aspects of the road performance of the asphalt mixture. [0003] Compared with traditional asphalt pavement, large void pavement, as a new pavement structure, has good noise reduction, drainage and anti-skid performan...

Claims

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Application Information

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IPC IPC(8): G06F19/00C04B26/26
CPCC04B26/26C04B2111/0075G16C99/00C04B14/00C04B20/0076C04B18/141
Inventor 吴旷怀陈明辉蔡旭谢若奇黄文柯
Owner GUANGZHOU UNIVERSITY
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