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Method for determining mineral aggregate gradation range based on gradation variability of raw materials

A determination method and gradation technology, which is applied in the field of determination of the gradation range of mixed materials and minerals, can solve the problems of large variability in particle composition, material variability is not considered, and synthetic gradation curves are not representative.

Active Publication Date: 2012-06-20
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the production and processing characteristics of raw materials such as road coarse aggregate, fine aggregate and filler, there is inevitably a certain variability in the performance of different batches of the same raw material, especially the variability in particle composition.
[0005] As mentioned above, the currently used asphalt mixture target mix ratio design method is to use the cold material screening results of raw materials to test a single grading curve without considering the variability of the material itself, so that when the variability of raw materials When it is very large, it will inevitably lead to the synthetic grading curve not being widely representative

Method used

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  • Method for determining mineral aggregate gradation range based on gradation variability of raw materials
  • Method for determining mineral aggregate gradation range based on gradation variability of raw materials
  • Method for determining mineral aggregate gradation range based on gradation variability of raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] [Example 1]: An expressway intends to use cement-stabilized macadam as the base material. The design gradation is shown in Table 1. The design requires that the representative value of the 7d unconfined compressive strength of the cement-stabilized macadam base is not less than 5MPa. The material is composed of 5 grades of raw materials, which are 19~26.5mm, 13.2~19mm, 9.5~13.2mm, 4.75~9.5mm, 0~4.75mm, try to determine the reasonable fluctuation range of mineral material gradation according to the variability of raw materials .

[0039] Table 1 Design gradation of cement-stabilized crushed stone

[0040] Mesh size mm

26.5

19

13.2

9.5

4.75

2.36

1.18

0.6

0.3

0.15

0.075

pass percentage%

100

84

68.5

57.5

40

26.5

17.5

11.5

7.5

5

3.5

[0041] According to above-mentioned content of the invention, concrete implementation st...

Embodiment 2

[0072] [Example 2]: The design gradation of AC10 asphalt concrete for a certain expressway is shown in Table 7. The material is composed of 0-3mm, 3-5mm, 5-10mm, and mineral powder. It is determined according to the variability of raw materials. Reasonable fluctuation range of mineral material gradation. The design requires that the dynamic stability of the rutting test is not less than 2000 times / mm, the relative deformation of the rutting test is not more than 5%, the maximum bending and tensile strain of the trabecular bending test is not less than 5000 microstrain, and the immersion Marshall residual stability of water stability is not less than 80%.

[0073] Table 7AC10 Asphalt Concrete Design Gradation

[0074] Mesh size mm

13.2

9.5

4.75

2.36

1.18

0.6

0.3

0.15

0.075

pass percentage%

100

97.5

35

27.3

21.3

16.8

13.1

10.2

8.0

[0075] Accordin...

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PUM

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Abstract

The invention relates to a method for determining mineral aggregate gradation range based on gradation variability of raw materials, which obtains average sieve curves and corresponding coefficients of fluctuation through sieve tests on various grades of raw material large sample amounts, and determines the fluctuation range of sieve classification, target resultant gradation and the use ratio ofvarious grades of raw materials, thereby determining the fluctuation range of various grades of raw materials. Values of throughput rate off design gradation of certain sieve pores in an upper fluctuation line and a lower fluctuation line are large because of the influence of the variability of raw materials, so that the complexity of material gradation is reflected. No matter an average value resultant gradation curve or the gradation fluctuant upper and lower fluctuation lines are adopted, the pavement performance can meet the relevant requirements, therefore, the control of raw material gradation is required to be enhanced during practical works, so as to ensure that the gradation is close to the average value resultant gradation curve to the greatest extent and does not exceed the upper and lower fluctuation lines, so that good pavement performance can be guaranteed.

Description

technical field [0001] The invention relates to the determination of the gradation range of the mixture and mineral materials used in road engineering, in particular to road surface materials composed of multi-grade granular materials such as inorganic binder stabilization materials and asphalt mixtures. Background technique [0002] For pavement materials composed of multi-grade granular materials such as inorganic binder stabilized materials and asphalt mixtures, the selection of gradation is the first step in the design of mix ratio. In order to meet the needs of the majority of project builders, the current specification recommends the corresponding grading range for various commonly used mixtures. However, due to the wide range, there are theoretically countless grading curves that meet the requirements between the upper and lower limits, and it is impossible for users to carry out experimental analysis for each curve that meets the requirements before screening. There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
Inventor 王旭东傅琴周兴业张蕾郭朝阳刘小滔
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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