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Cow dung ash asphalt concrete pavement material and its preparation method

An asphalt concrete and pavement material technology, which is applied in the field of asphalt concrete pavement materials, can solve the problems of asphalt concrete pavement damage, insufficient cohesion, shortened service life, etc., and achieves the effects of improving the performance of asphalt concrete, improving performance indicators, and sufficient waste.

Inactive Publication Date: 2013-05-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The service performance of asphalt concrete pavement is severely weakened, and its service life is also greatly shortened, causing serious economic losses and unnecessary waste
[0003] The main reason is that the asphalt mortar in asphalt concrete is composed of asphalt and mineral powder, which is acidic to a certain extent, which will cause insufficient cohesion between it and the aggregate, resulting in damage to the asphalt concrete pavement

Method used

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  • Cow dung ash asphalt concrete pavement material and its preparation method
  • Cow dung ash asphalt concrete pavement material and its preparation method
  • Cow dung ash asphalt concrete pavement material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw materials of this embodiment are combined according to the following volume ratios. Limestone aggregate accounts for 89.3%;

[0029] The preparation method of the cow dung ash asphalt concrete material in this embodiment comprises the following steps: first calcining cow dung at a temperature of 500° C., cooling to room temperature, and sieving cow dung ash with a 0.075 mm square hole sieve; Cow dung ash is used instead of limestone powder, and cow dung ash and limestone powder are mixed evenly; limestone aggregate and road asphalt are stirred at 165°C, then the mixture of cow dung ash and limestone powder is added, and finally stirred evenly.

Embodiment 2～13

[0031] The asphalt concretes of Examples 2-13 were prepared according to the method described in Example 1, and the raw materials and their volume ratios are shown in Table 2.

[0032] Table 2 Asphalt concrete volume mix ratio

[0033]

[0034]

[0035] Test example:

[0036] The bituminous concrete specimens formed in Examples 1 to 13 were erected on the platform, and cooled at room temperature for 24 hours, and then carried out the Kenta fort of the concrete according to "Test Regulations for Asphalt and Bituminous Concrete in Highway Engineering" (JTJ052-2000). Road performance tests such as scattering loss, the test results are shown in Table 3.

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Abstract

The invention discloses a cow dung ash asphalt concrete pavement material and its preparation method. The cow dung ash asphalt concrete pavement material is prepared from the following raw materials of: limestone aggregates, paving asphalt, limestone ore powder and cow dung ash. The preparation method contains the following steps of: firstly calcining cow dung ash at different temperatures, cooling to room temperature, sieving through a square-opening sieve, mixing limestone ore powder and cow dung ash according to a certain volume percentage, stirring limestone aggregates and paving asphalt at a certain temperature, adding a mixture of cow dung ash and limestone ore powder, and finally uniformly stirring. The result shows that pavement properties such as Cantabro flying loss, Marshall stability, dynamic stability, freeze-thaw split intensity ratio and the like of asphalt concrete are obviously raised after the addition of a proper amount of cow dung ash. The low-cost cow dung material is fully utilized, and the cow dung ash asphalt concrete pavement material provided by the invention can satisfy requirements of asphalt concrete pavements.

Description

technical field [0001] The invention relates to an asphalt concrete pavement material, in particular to a cow dung ash asphalt concrete pavement material and a preparation method thereof. Background technique [0002] With the wide application of asphalt concrete pavement in highway engineering, its durability and early failure of pavement structure are becoming more and more prominent. The results of field investigations show that, one to two years after many asphalt highway projects are put into use, or even less than a year, the asphalt surface layer has produced a lot of pockmarks, looseness, falling particles, pumping, potholes, nets, etc. The internal structure of asphalt concrete is severely eroded and stripped, which has become the main form of asphalt concrete pavement damage in highway engineering in my country. The service performance of asphalt concrete pavement is severely weakened, and its service life is also greatly shortened, causing serious economic losses ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
Inventor 王振军蒋玮艾涛赵鹏侯小红石艳
Owner CHANGAN UNIV