Cold-paving cutback asphalt material modified with cement and nano-clay

A technology of nano-clay and diluted asphalt, which is applied in the field of asphalt pavement maintenance, can solve the problems of low early strength and poor water stability, and achieve the effect of improving early strength, improving adhesion and improving water stability

Inactive Publication Date: 2018-07-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low early strength and poor water stability of the existing diluted asphalt cold patch, the invention provides a diluted asphalt cold patch modified with cement and nano-clay, which has higher skeleton strength, early strength and water stability

Method used

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  • Cold-paving cutback asphalt material modified with cement and nano-clay
  • Cold-paving cutback asphalt material modified with cement and nano-clay
  • Cold-paving cutback asphalt material modified with cement and nano-clay

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The preparation method of the diluted asphalt cold patch material modified by cement and nano-clay in the present embodiment is as follows:

[0040] (1) Configure mineral materials according to the gradation composition, put them into a 120°C constant temperature drying oven for 4 hours; take the aggregate with a weight percentage of 92.04%, and pour it into a mixing pot, and the temperature of the stirring pot is also controlled at 120°C;

[0041] (2) Take cement and nanoclay whose weight percents are respectively 5.60% and 2.5%, mix well, pour into a mixing pot, and mix for 60 seconds;

[0042] (3) Configuration of dilute asphalt: heat and melt 70# matrix asphalt, and control the temperature at about 120°C; take 4.42% by weight of asphalt, add 1.10% by weight of diesel oil, and stir well to obtain Thin asphalt. Pour into the mixing pot and stir for 60s;

[0043] (4) Add the mineral powder component in the mineral material and stir for 60s.

Embodiment 2

[0045] The preparation method of the diluted asphalt cold patch material modified by cement and nano-clay in the present embodiment is as follows:

[0046] (1) Configure mineral materials according to the gradation composition, put them into a 120°C constant temperature drying oven for 4 hours; take the aggregate with a weight percentage of 89.76%, and pour it into a mixing pot, and the temperature of the stirring pot is also controlled at 120°C;

[0047] (2) Take cement and nanoclay whose weight percentages are respectively 6.20% and 2.9%, mix evenly, pour into a mixing pot, and mix for 60 seconds;

[0048] (3) Configuration of dilute asphalt: heat and melt 70# base asphalt, and control the temperature at about 120°C; take 4.30% by weight of asphalt, add 1.08% by weight of diesel oil, and stir well to obtain Thin asphalt. Pour into the mixing pot and stir for 60s;

[0049] (4) Add the mineral powder component in the mineral material and stir for 60s.

Embodiment 3

[0051] The preparation method of the diluted asphalt cold patch material modified by cement and nano-clay in the present embodiment is as follows:

[0052] (1) Configure mineral materials according to the gradation composition, put them into a 120°C constant temperature drying oven for 4 hours; take the aggregate with a weight percentage of 87.79%, and pour it into a mixing pot, and the temperature of the stirring pot is also controlled at 120°C;

[0053] (2) Take cement and nanoclay whose weight percentages are respectively 9.80% and 3.2%, mix evenly, pour into a mixing pot, and mix for 60 seconds;

[0054] (3) Configuration of diluted asphalt: heat and melt 70# base asphalt, and control the temperature at about 120°C; take 4.21% by weight of asphalt, add 1.05% by weight of diesel oil, and stir well to obtain Thin asphalt. Pour into the mixing pot and stir for 60s;

[0055] (4) Add the mineral powder component in the mineral material and stir for 60s.

[0056] In order to ev...

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Abstract

The invention discloses a cold-paving cutback asphalt material modified with cement and nano-clay and belongs to the field of asphalt pavement maintenance. The cold-paving cutback asphalt material isprepared from components in percentage by weight as follows: 87.78%-92.05% of aggregates, 4.21%-4.42% of asphalt, 1.05%-1.10% of a diluent, 5.60%-9.80% of cement and 2.5%-3.2% of nano-clay, wherein the aggregates are basalt and are subjected to discontinuous grading to form a framework dense structure; the asphalt is 70# matrix asphalt; the diluent is diesel oil; the cement is ordinary Portland cement and has high activity and high alkalinity, the cement is subjected to a reaction with carboxylic acid in the asphalt, a product with higher adhesivity is generated and has a larger specific surface area, and a framework asphalt ratio is increased; the nano-clay is high in water absorbing capacity and can expand to seal gaps in case of water invasion, further, adsorbed water and cement are subjected to a hydration reaction, so that water is prevented from continuous invasion, and water stability of the cold-paving material is improved. The prepared cold-paving cutback asphalt material hashigher framework strength, early strength and water stability.

Description

technical field [0001] The invention belongs to the field of asphalt pavement maintenance, and in particular relates to a diluted asphalt cold patch modified by cement and nano-clay. Background technique [0002] With the rapid development of my country's economy and the continuous increase of traffic volume, the asphalt pavement has been subjected to more and more severe tests. During the long-term use of asphalt pavement, it is affected by various factors such as vehicle axle load, temperature difference between day and night, rain erosion, asphalt aging, etc., and various diseases such as potholes, washboards, ruts, and cracks often appear. These diseases on the pavement will affect the normal traffic of the road, reduce the service level of the asphalt pavement, and even cause traffic accidents in severe cases. Therefore, timely treatment of road surface diseases is necessary. [0003] At present, there are mainly two kinds of filling materials for repairing road pits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/0075C04B14/104C04B24/36C04B24/00C04B14/14
Inventor 董侨袁嘉伟陈雪琴肖飞涂珊珊
Owner SOUTHEAST UNIV
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