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Multi-component fibre composite asphalt concrete and preparing method thereof

A multi-component fiber and composite asphalt technology is applied in the field of asphalt concrete, which can solve the problems of high price, restrict the application of composite asphalt concrete, and have no obvious improvement in the performance of asphalt mixture, and achieve the effect of reducing project cost.

Inactive Publication Date: 2008-07-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The incorporation of fiber can improve the road performance of asphalt mixture. The key lies in the stabilization and reinforcement of fiber to asphalt concrete. The main performance of lignin fiber is to improve the thermal stability by adsorbing and stabilizing asphalt. There is no obvious improvement in other properties of the fiber. Due to its low price, this type of fiber is widely used in practical engineering; and polymer fibers such as polyester and polyacrylonitrile have a certain adsorption and stabilization effect, and their effect on asphalt The bridging and reinforcing effect of the asphalt mixture is more obvious, so the road performance of the asphalt mixture can be greatly improved, but due to the high price of polymer fibers such as polyester fibers and polyacrylonitrile fibers, this type of asphalt mixture is restricted. Application of Fiber Composite Asphalt Concrete in Practical Engineering

Method used

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  • Multi-component fibre composite asphalt concrete and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The synthetic gradation design of ordinary dense gradation (AC) 13 multi-component fiber composite asphalt concrete is shown in Table 1.

[0032] Ordinary dense gradation (AC) 13 multi-component fiber composite asphalt concrete: the optimum asphalt ratio is 5.2%, the amount of multi-component fiber is 0.3%, the void ratio of multi-component fiber asphalt mixture is 4.0%, and the Marshall stability It is 12.8kN, the flow value is 3.5mm, the residual stability is 90.5%, the freeze-thaw splitting strength ratio is 87.6%, and the rutting stability is 5823 times / mm.

Embodiment 2

[0034] The synthetic gradation design of Superpave 12.5 multi-component fiber composite asphalt concrete mixture is shown in Table 2.

[0035] High-performance asphalt pavement (Superpave) 12.5 multi-component fiber composite asphalt mixture: the optimal asphalt ratio is 5.1%, the amount of multi-component fiber is 0.3%, and the void ratio of multi-component fiber asphalt mixture is 4.2%, Marshall The stability is 13.2kN, the flow value is 3.0mm, the residual stability is 91.6%, and the freeze-thaw splitting strength ratio is 88.4%.

[0036]In this example, the rutting dynamic stability and rutting depth of the asphalt mixture mixed with lignin fiber, polyester fiber and multi-component fiber were compared, see Figure 2 and Figure 3. It can be seen from the results in Fig. 2 that the dynamic stability of rutting of specimen 1 is 5164 times / mm, the dynamic stability of specimen 2 is 6879 times / mm, and the dynamic stability of specimen 3 is 7472 times / mm. The rutting dynamic st...

Embodiment 3

[0038] The synthetic gradation design of asphalt horseshoe macadam (SMA) 16 multi-component fiber composite asphalt concrete mixture is shown in Table 3.

[0039] Asphalt horseshoe grease macadam (SMA) 16 multi-component fiber asphalt mixture: the optimal asphalt ratio is 6.2%, the amount of multi-component fiber is 0.3%, and the void ratio of multi-component fiber asphalt mixture is 4.0%, Marshall The stability is 11.2kN, the flow value is 3.2mm, the residual stability is 89.8%, the freeze-thaw splitting strength ratio is 85.2%, and the rutting dynamic stability is 6824 times / mm.

[0040] schedule

[0041] Table 1 Synthetic gradation design of ordinary dense gradation (AC)13 multi-component fiber composite asphalt mixture

[0042] Aperture mm

16

13.2

9.5

4.75

2.36

1.18

0.6

0.3

0.15

0.075

Synthetic gradation%

100

91.8

70.6

38.8

27.1

21.8

17.5

12.7

...

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Abstract

The invention relates to a multicomponent fiber composite asphaltic concrete and the preparing process thereof. The concrete comprises rough aggregates, fine aggregates, powdered ore filler, asphalt and multicomponent fiber material, the blending amount of the multicomponent fiber material is 0.2-0.4% wt of the mass of the multicomponent fiber composite asphaltic concrete. The preparing process of the concrete is firstly heating the aggregates to 170 DEG C to blend with the multicomponent fiber, then to blend with asphalt with temperature of 150 DEG C to 170 DEG C, then adding powdered ore filler to mix evenly and employing Marshall compacting process to compact each of the two sides of the multicomponent fiber composite asphaltic concrete 75 times, or employing rolling method for molding, rolling back and forth for 15-18 times, or employing rotary compacting method to select rotary compacting times for molding as the case might be. The invention has important economic and social sequences in terms of large-scaled popularization and application of multicomponent fiber composite asphaltic concrete on pavement with high grades, decreasing the cost of construction projects, improving running quality of pavement and the like.

Description

technical field [0001] The invention relates to asphalt concrete, in particular to a multi-component fiber composite asphalt concrete capable of significantly improving road performance and a preparation method thereof. Background technique [0002] The practice of high-grade highway construction at home and abroad for decades shows that due to the continuous increase in traffic volume and vehicle load and the influence of natural factors, the asphalt pavement designed according to the current pavement design system and standards often fails to reach the design service life. , there will be early damage or even structural damage to the asphalt pavement. Therefore, in order to prolong the service life of the road and reduce maintenance costs, it is necessary to adopt effective modification and enhancement methods and means to improve the quality of asphalt pavement. [0003] Fiber-modified asphalt concrete is a composite material that improves the overall performance of asph...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B18/12C04B24/24
CPCY02W30/91
Inventor 吴少鹏岳红波叶群山磨炼同陈筝李波黄俊峰李宁
Owner WUHAN UNIV OF TECH
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