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OAC (Optimum Asphalt Content) design method of modified asphalt concrete mixture in target mix proportion stage

A technology of modified asphalt and design method, which is applied in the field of asphalt concrete, can solve problems such as complex engineering, achieve the effects of simple steps, objective results, and reduced design time

Active Publication Date: 2014-12-10
CHENGDU SIXTH CONSTR ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current method needs to undergo testing, drawing, calculation, and re-verification methods. Therefore, in addition to being greatly affected by human factors, the current method also has shortcomings such as engineering complexity.

Method used

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  • OAC (Optimum Asphalt Content) design method of modified asphalt concrete mixture in target mix proportion stage
  • OAC (Optimum Asphalt Content) design method of modified asphalt concrete mixture in target mix proportion stage
  • OAC (Optimum Asphalt Content) design method of modified asphalt concrete mixture in target mix proportion stage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 This example is an example of laying AC-13 Qingchuanyan asphalt modified asphalt surface on a certain level of highway section in Chengdu, Sichuan.

[0030] 1. Required equipment, see Table 1

[0031] Table 1. Required equipment

[0032] Serial number

Name

Unit

Quantity

Remarks

1

Total Station

Taiwan

1

2

Level

Taiwan

2

DZS3-1 type

3

Asphalt Mixing Machine

Taiwan

1

4

Electronic scale

Taiwan

1

46kg range, 0.1g sense

5

Electronic scale

Taiwan

1

The range is 300~500g, the sensitivity is 0.001g

6

Marshall Stability Tester

Taiwan

1

LD190-II

7

Rutting test forming machine

Taiwan

2

8

Stone standard sieve

set

1

2.5~100mm

9

Sand standard sieve

set

1

0.16~5mm

10

Asphalt Penetration Tester

Taiwan

1

Measure the penetration value and calculate the PI

11

Marshall Tester

Taiwan

1

12

Asphalt Extractor

Taiwan

1

13

Marshall Stripper

Taiwan

1

14

Temperature control asphalt mixing machine

Taiwan

1

15

Constant tempe...

Embodiment 2

[0071] Example 2 This example is an example of laying AC-16 modified asphalt surface layer in a road reconstruction project in Chengdu Hi-tech Park.

[0072] 1. The equipment required is the same as Table 1 in Example 1.

[0073] 2. Material

[0074] (1) Modified asphalt: SBS modified asphalt, accounting for 4% by weight.

[0075] (2) Matrix asphalt: AH-70, accounting for 96% by weight.

[0076] (3) Aggregate and filler

[0077] ①Coarse aggregate: 1# crushed stone (13.2mm-16mm), 2# crushed stone (9.5mm-13.2mm), 3# crushed stone (4.75mm-9.5mm).

[0078] ②Fine aggregate: stone chips (0mm-4.75mm).

[0079] ③ Filler: mineral powder.

[0080] 3. Mineral material grading

[0081] Mineral material grading is carried out in accordance with "Technical Specification for Highway Asphalt Pavement Construction" JTG_F40-2004, see Table 5. AC-16 mineral material screening and composite grading curve diagram figure 2 .

[0082] 5. AC-16 mineral material screening and synthesis grading table

[0083]

[0084]...

Embodiment 3

[0103] Example 3 This example is an example of the AC-20 modified asphalt surface layer of the Jiaotongda Road Reconstruction Project in Chengdu, Sichuan Province.

[0104] 1. The equipment required is the same as Table 1 in Example 1.

[0105] 2. Material

[0106] (1) Modified bitumen bitumen: BRA modified bitumen, accounting for 35% by weight.

[0107] (2) Base asphalt: No. 70 A grade road petroleum asphalt, accounting for 65% by weight.

[0108] (3) Aggregate and mineral powder

[0109] ①Coarse aggregate: 1# crushed stone (10mm-20mm), 2# crushed stone (5mm-15mm), 3# crushed stone (5mm-10mm).

[0110] ②Fine aggregate: stone chips (0mm-5mm).

[0111] ③ Filler: mineral powder.

[0112] 3. Mineral material grading

[0113] Mineral material grading is carried out in accordance with "Technical Specification for Highway Asphalt Pavement Construction" JTG_F40-2004, see Table 8 for details: AC-20 mineral material screening and composite grading curve diagram image 3 .

[0114] Table 8. AC-20 Miner...

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Abstract

The invention relates to the technical field of asphalt concrete and in particular relates to an OAC (Optimum Asphalt Content) design method of a modified asphalt concrete mixture in a target mix proportion stage. The OAC design method disclosed by the invention can be used for obtaining the OAC by direct formula computing instead of a method which comprises the following steps of carrying out Marshall test to obtain various technical indexes first, then drawing a curve, determining various numerical values and then carrying out calculation and experimental verification in the prior art. The OAC design method is simple in process, free of human factor influences and more objective and accurate in result.

Description

Technical field [0001] The invention belongs to the technical field of asphalt concrete, and particularly relates to an OAC design method of a modified asphalt concrete mixture at a target mixing ratio stage. Background technique [0002] Modified asphalt is an asphalt material made of high molecular polymers, natural asphalt and other modified materials alone or in combination, and is suitable for asphalt pavements of various grades of highways. Among them, natural bitumen is a natural form of petroleum bitumen which is formed by oil being squeezed by the earth's crust for a long time in nature and in contact with air and water. It is often mixed with a certain proportion of minerals according to the environment in which it is formed The difference can be divided into lake asphalt, rock asphalt, submarine asphalt and so on. Qingchuan rock asphalt is a kind of natural rock asphalt, which is widely distributed in the Longmen Mountain area in northern Sichuan of my country. There...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/18
Inventor 黄良刘超
Owner CHENGDU SIXTH CONSTR ENG
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