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Water seepage meter and method for measuring large gap pavement structure multidirectional permeability coefficients

A technology of permeability coefficient and pavement structure, applied in permeability/surface area analysis, instruments, measuring devices, etc., can solve the problems of unstable test results, difficult water head height, etc.

Active Publication Date: 2017-03-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ma Xiang designed a method specifically for the determination of the lateral coefficient in his paper "Drainage Composite Airport Pavement Structure and Material Design". A cube specimen formed by static pressure is used, and the water flow passes through the specimen laterally, which is difficult to keep constant. The height of the water head, and the forming method of the specimen required for the test is completely different from the specification requirements and the field compaction method, and the specimens required for the permeability coefficient in different directions are different, resulting in unstable test results

Method used

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  • Water seepage meter and method for measuring large gap pavement structure multidirectional permeability coefficients

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1: Determination of comprehensive permeability coefficient of single-layer asphalt mixture specimen compacted indoors

[0068] Step 1: According to the design gradation and design asphalt dosage, the passing rate of aggregates with different particle sizes is as follows: 16mm:9.5mm:4.75mm:2.36mm:1.18mm:0.6mm:0.3mm:0.15mm:0.075mm= 100:95.3:61.6:23.3:16.3:13.2:10.7:8.8:7.4:5.4, the design asphalt dosage is 4.58%. The asphalt and aggregates were mixed at 180°C, and a test piece with a diameter of 100 mm and a height of 63.5 mm was formed by a rotary compactor, and the rotary compactor was rotated and compacted 50 times. After the test piece is formed, keep it warm at 20°C for 24 hours before use. According to the measured height H and diameter D of the test piece, the calculated cross-sectional area A of the test piece is 7853.98mm 2 .

[0069] Step 2: Connect the middle mold barrel 6 and the lower mold barrel 11 with a coaxial seal, a rubber sealing ring is san...

Embodiment 2

[0077] Example 2: Determination of vertical permeability coefficient of single-layer asphalt mixture specimen compacted indoors

[0078] Step 1: Connect the middle mold barrel 6 and the lower mold barrel 11 in a coaxial sealing connection, with a rubber sealing ring clamped between the middle mold barrel 6 and the lower mold barrel 11, and tighten the middle mold barrel 6 and the lower mold barrel 11 with screws to ensure Water does not flow out of the gap. The diameter of middle die cylinder 6 is 103mm, and height is 63.5mm. The diameter of lower mold cylinder 11 is 103mm, and height is 100mm.

[0079] Step 2: Use the test piece as in Step 1 of Example 1, and apply Vaseline evenly on the side of the test piece with a spatula to seal the entire side of the test piece, and the coating thickness is 0.8 mm to 1 mm. During the application process, prevent petroleum jelly from being applied to the upper and lower surfaces of the test piece. Put the smeared test piece into the mi...

Embodiment 3

[0081] Example 3: Determination of lateral permeability coefficient of single-layer asphalt mixture specimen compacted indoors

[0082] Steps 1-2: Same as Steps 1-2 in Example 1.

[0083] Step 3: Apply Vaseline evenly on the lower surface of the test piece with a spatula, and seal the entire lower surface of the test piece with a thickness of 0.8 mm to 1 mm. During the application process, prevent petroleum jelly from spreading to the sides of the test piece. After the smearing is completed, the test piece is placed on the porous water-permeable plate 9 in the middle mold barrel 6 .

[0084] Steps 4-9: Same as Steps 4-9 in Example 1, the measured transverse permeability coefficient is 0.296 cm / s.

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Abstract

The invention discloses a water seepage meter and method for measuring large gap pavement structure multidirectional permeability coefficients. The water seepage meter includes an upper mold cylinder (2), a test piece (5), a middle mold cylinder (6), a lower mold cylinder (11) and a pressure measuring device. The upper mold cylinder, the middle mold cylinder and the lower mold cylinder are mainly sealed by rubber seal rings and connected in a screwed mode by screws. The pressure measuring device is mainly composed of two pressure measuring pipes, and an upper pressure measuring mouth (4) in the upper mold cylinder and a lower pressure measuring mouth (12) in the lower mold cylinder are connected with the two pressure measuring pipes respectively. The test piece is placed in the middle mold cylinder; the middle mold cylinder has two heights, namely, 63.5 mm and 100 mm, and the middle mold cylinder with the height of 63.5 mm and the middle mold cylinder with the height of 100 mm are respectively used for measuring the permeability coefficient of a single-layer asphalt mixture test piece formed by compaction molding in a room and the permeability coefficient of a multilayer asphalt mixture test piece formed by on-site pavement core-drilling and sampling. The method for measuring the large gap pavement structure multidirectional permeability coefficients is suitable for measuring the vertical permeability coefficient, horizontal permeability coefficient and comprehensive permeability coefficient of a large gap pavement structure, and the drainage performance of a drainage pavement is better evaluated.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a water seepage meter for measuring the multi-directional permeability coefficient of a pavement structure with large voids and a measuring method thereof. Background technique [0002] With the progress of the times, the road quality that people care about, in addition to durability and comfort, the most important thing is safety. The anti-skid ability of the asphalt pavement of my country's trunk roads generally fails to meet the requirements. The section with friction coefficient pendulum value F<40 accounts for more than 50%, and the section with surface structure depth TD<0.3mm accounts for more than 70%. After the rain, the anti-skid ability is lower, and there are more traffic accidents in rainy days, which cause greater casualties and economic losses. According to the survey results of Jingshi Expressway, the traffic accidents caused by rain, fog and sno...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 顾兴宇王晓威章天杰
Owner SOUTHEAST UNIV
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