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High modulus asphalt concrete and method for preparing same

A kind of asphalt concrete, high modulus technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems that the performance cannot meet the road use, immaturity, etc., reduce the bending and tensile strain, improve the road performance effect

Inactive Publication Date: 2009-01-07
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the performance of low-grade asphalt in my country cannot meet the requirements for road use, the conditions for using low-grade asphalt to prepare high-modulus asphalt concrete in China are not yet mature.

Method used

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  • High modulus asphalt concrete and method for preparing same
  • High modulus asphalt concrete and method for preparing same
  • High modulus asphalt concrete and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1. Effect of powder-to-glue ratio on the high-temperature performance of asphalt mortar

[0045] Raw materials:

[0046] (1) Asphalt: Karamay AH-90 asphalt (Xinjiang Karamay Oil Refinery) whose technical indicators meet the requirements of standard A-grade asphalt is used.

[0047] (2) Mineral powder: Jingyang limestone mineral powder, its apparent density is 2.778g / cm 3 .

[0048] Mineral powder was used as filler, and asphalt mortar was prepared according to five different powder-to-glue ratios of 0.6, 0.8, 1.0, 1.2, and 1.4, and the dynamic shear rheological test (DSR) in the asphalt binder performance specification of the US SHRP program was used to test the The high temperature performance of asphalt mortar was tested and evaluated. See the test results figure 2 .

[0049] From figure 2 It can be seen from the figure that the index reflecting the high temperature performance of asphalt mortar—the rutting factor G * / sinδ increases significantly wit...

Embodiment 2

[0050] Example 2. Effect of powder-to-glue ratio on the low-temperature performance of asphalt mortar

[0051] The starting materials are the same as in Example 1.

[0052] Mineral powder was used as filler, and asphalt mortar was prepared according to five different powder-to-glue ratios of 0.6, 0.8, 1.0, 1.2, and 1.4, and the bending beam rheological test (BBR) was used to test the asphalt The performance of the glue at -12°C and -18°C was tested and evaluated. The test results are shown in Figure 3.

[0053] The results in Fig. 3 show that as the powder-to-binder ratio increases, the stiffness modulus S reflecting the low-temperature performance of asphalt mortar increases gradually, and the creep rate m decreases slightly. It shows that the low-temperature crack resistance of the mortar decreases slightly with the increase of the powder-to-glue ratio, especially when the powder-to-glue ratio exceeds 1.0, this downward trend is more obvious. This is because after the add...

Embodiment 3

[0054] Example 3. Effect of polymer external admixture on compressive strength and modulus of resilience of AC-20 type asphalt mixture

[0055] Raw materials:

[0056] (1) Aggregate: Clean, hard and wear-resistant Xingyang limestone aggregates are used, and its technical indicators meet the requirements of the normative standards.

[0057] (2) Asphalt: Korean SK-70 asphalt (Korean SK Group) whose technical indicators meet the requirements of standard A-grade asphalt is used.

[0058] (3) Mineral powder: Queshan limestone, the apparent density is 2.682g / cm 3

[0059] (4) Polymer external dopant: PR Module high modulus additive (French PRI company), its various technical indicators are shown in Table 1.

[0060] Table 1

[0061] nature

unit

value

color

-

grey

diameter

mm

5

density

g / cm3

0.93～0.965

melting point

℃

175

gradation

mm

0 / 5

[0062] Mineral material gr...

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Abstract

The invention discloses high modulus asphaltic concrete and a preparation method thereof. The high modulus asphaltic concrete primarily consists of aggregate, asphalt, powdered ore and additive. In the powdered ore, asphalt accounts for 1.0 to 1.4 by weight; the additive is 0.5 to 0.8 percent of the high modulus asphalt concrete by weight. In the preparation method, the additive is added to the aggregate at the temperature of 180 to 190 DEG C, and the mixture of the additive and the aggregate is beaten in dry state for 13 to 17 seconds; hot liquid asphalt is added immediately and the powdered ore is added; the mixture is beaten for 45 to 50 seconds at the temperature of 165 DEG C to 175 DEG C. All of the road performance indices of the high modulus asphalt concrete reach the state codes and standards. In addition, the high modulus asphaltic concrete has good mechanical property, which can meet the requirements of heavy traffic of speedways and high temperature resistant tracks.

Description

technical field [0001] The invention relates to an asphalt concrete road paving material and a preparation method thereof, in particular to a high modulus asphalt concrete and a preparation method thereof. Background technique [0002] At present, the combination of semi-rigid base and asphalt pavement is generally used on high-grade highways in my country. This combination of structures has been widely promoted due to the strong bearing capacity of the base and the relatively small demand for asphalt materials. However, with the rapid increase of road traffic volume, overloading and heavy loads are repeatedly prohibited. This kind of asphalt pavement often suffers from rutting, cracking and other diseases in the early stage of use, and cannot continue to provide traffic conditions within the design life. This is because the asphalt pavement, as a flexible structure, is located at the top of the pavement structure and directly bears the compaction and impact of vehicle tires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B18/12
CPCY02W30/91
Inventor 沙爱民周庆华杨琴马峰
Owner CHANGAN UNIV
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