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Substitution material in use for testing construction machinery for asphalt pavement, and its prodn. tech

A technology of asphalt pavement and construction machinery, which is applied in the field of substitute materials, can solve the problems of flying mineral powder, increasing the actual workload of the test, and the fluidity of dry material cannot fully and truly reflect the fluidity of hot asphalt mixture. Economic and social benefits, shortening product replacement cycle, and reducing road maintenance costs

Inactive Publication Date: 2009-11-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The hot asphalt mixture cannot be recycled, and the repeatability of the test is greatly limited
In addition, after the first experiment, the hot asphalt mixture becomes solid due to the temperature drop, and cannot be used in the second experiment, resulting in a lot of waste of asphalt mixture and greatly increasing the actual workload of the experiment (test After the completion, a large amount of solid asphalt mixture needs to be processed)
[0007] (2) Difficulty in temperature control
[0008] (3) The test site is limited
The fluidity of the dry material cannot fully reflect the fluidity of the hot asphalt mixture, and there is a large deviation between the test results and the real results
[0011] (2) Since the fluidity of the dry material is far less than that of the hot asphalt mixture, it is easy to appear "stuck" phenomenon during the test
[0012] (3) The loss of mineral powder is serious and pollutes the environment
When the dry material is used for the test, the ore powder is flying, causing serious pollution to the test environment

Method used

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  • Substitution material in use for testing construction machinery for asphalt pavement, and its prodn. tech
  • Substitution material in use for testing construction machinery for asphalt pavement, and its prodn. tech

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of 135°C asphalt mixture (asphalt grade is Donghai brand AH-70, ore grading is AC-20I) test substitute material at room temperature (25°C).

[0037] The viscosity value of Donghai brand AH-70 bitumen at 135°C is 0.44Pa·s obtained from relevant standards. Therefore, 0.44Pa·s is taken as the target viscosity value.

[0038] Through the quasi-slump experiment on hot asphalt mixture at 135℃, the target slump value is 189mm.

[0039] According to the target viscosity value of 0.44Pa s, select a lubricating oil with the closest viscosity at 25°C, that is, select a medium-duty industrial valve with the code name N220 (that is, the ISO viscosity grade is 220) from GB 5903-1995. Type gear oil (ie L-CKC220). Actually, the lubricating oil selected may be any lubricating oil with a viscosity slightly less than 0.44 Pa·s.

[0040] Stir lubricating oil L-CKC220 and mineral material graded as AC-20I according to the oil-stone ratio of 3% to form a lubricating...

Embodiment 2

[0043] Embodiment 2: quasi-slump test.

[0044] 1. Purpose and scope of use:

[0045] 1) Measure the slump of the mixture to evaluate the workability of the mixture. If necessary, it can also be used to evaluate the change of workability of the mixture with the resting time of the mixture.

[0046] 2) It is suitable for plastic and fluid mixtures with the maximum particle size of the aggregate not exceeding 40mm and the slump of 10mm to 230mm.

[0047] 2. Instruments and equipment:

[0048] 1) Slump cylinder: made of iron sheet with a thickness of 2mm to 3mm, and the inner wall of the cylinder must be smooth;

[0049] 2) Two 300mm steel rulers, 40mm aperture sieve, charging funnel, trowel, small shovel, thermometer, etc.

[0050] 3. Experimental steps:

[0051] 1) Mix the mixture evenly. If the particle size of the aggregate exceeds 40mm, it should be removed by wet sieving, or it can be removed manually.

[0052] 2) Rinse the slump cylinder and keep it moist, put it on...

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Abstract

A substitute material and production process for asphalt pavement construction machinery test, the process is, ore aggregate: use the same mineral material gradation as the mineral material gradation used in standard asphalt mixture; adopt the specified stage temperature condition The mechanical lubricating oil with the viscosity value equal to or not lower than 5% of the corresponding label bitumen that meets the standard; mix the above-mentioned lubricating oil and ore aggregates evenly according to the mass ratio of oil stone at 2.5% to 3.5%, and become a lubricating oil mixture ; Under the condition of 15°C to 35°C, carry out the quasi-slump test on the lubricating oil mixture, and adjust the oil ratio to make the slump value reach the target slump value of the actual asphalt mixture, which is the Said substitute materials. The substitute material of the present invention can truly simulate the fluidity of hot asphalt mixture at room temperature, and can be used repeatedly without considering the problem of temperature control, and the test site is not limited; there will be no "stuck" phenomenon, and the loss of mineral powder is small. Little pollution to the test environment; and low cost, easy to clean.

Description

technical field [0001] The invention relates to a substitute material for asphalt pavement construction machinery test and its production process, in particular to hot asphalt mixture such as agitator of asphalt mixture mixing equipment, spiral agitator in transfer vehicle, and spiral distributor of paver Test substitute materials and production process of the contacted working device. Background technique [0002] Due to the many advantages of asphalt pavement, it has been widely used and is the development direction of high-grade highway pavement structure. However, the performance of the current asphalt pavement construction equipment and construction technology are not perfect enough, so that the completed asphalt pavement roads still have rework, the road life does not meet the design requirements, and premature water seepage, muddying, wrapping, rutting, cracking, and local pits Holes and other diseases; resulting in a large amount of asphalt pavement maintenance and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/08C09K3/00
Inventor 李自光游张平何志勇李万莉朱福民颜荣庆周小峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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