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Pre-treatment method for reducing crack on semi-rigid base asphalt pavement

A technology of semi-rigid base and asphalt pavement, which is applied in the direction of roads, roads, road repairs, etc., to achieve the effect of improving pressure resistance and service life and reducing reflective cracks

Inactive Publication Date: 2015-02-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional methods of reducing cracks, such as improving the proportion of crushed stone, using additives, setting up isolation layers, controlling the amount of cement, increasing the thickness of the pavement, and maintenance have all controlled the occurrence of cracks to a certain extent, but cracks still inevitably become the main problem. harm

Method used

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  • Pre-treatment method for reducing crack on semi-rigid base asphalt pavement

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Experimental program
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Effect test

Embodiment 1

[0017] A pretreatment method for reducing semi-rigid base asphalt pavement cracks, including the steps: after the base layer 3 is cured for 1 day, the base layer 3 is vibrated and rolled multiple times with a vibratory roller with a wheel load of more than 13 tons. It is 3.2km / h, and the compacted area of ​​the base layer 3 accounts for more than 90% of the total area of ​​the base layer 3. The stiffness test is performed every time the base layer 3 is pressed. When the stiffness of the base layer 3 drops to 40% before the compaction, the compaction is stopped, and then immediately Cover with a film and continue to sprinkle water for curing for more than seven days to restore the stiffness of the base layer 3. At the same time, the mesh micro-cracks can be effectively self-healed through hydration and other reactions, which not only guarantees the required stiffness of the road surface, but also passes through the base layer. Micro-cracks can effectively control the generation o...

Embodiment 2

[0019] A pretreatment method for reducing semi-rigid base asphalt pavement cracks, including the steps: after the base 3 has been cured for 2 days, the base 3 is vibrated and rolled multiple times with a vibratory roller with a wheel load of more than 13 tons. It is 4km / h. The area of ​​the base layer 3 being rolled accounts for more than 90% of the total area of ​​the base layer 3. The stiffness test is performed every time the base layer 3 is pressed. When the rigidity of the base layer 3 drops to 50% before rolling, stop rolling, and then use it immediately. Cover with film and continue to sprinkle water for curing for more than seven days to restore the stiffness of the base layer 3. At the same time, the meshed micro-cracks can be effectively self-healed through hydration and other reactions, which can not only ensure the required stiffness of the road surface, but also pass through the base layer. Cracks can effectively control the generation of reflection cracks on the ro...

Embodiment 3

[0021] A pretreatment method for reducing semi-rigid base asphalt pavement cracks, including the steps: after the base 3 has been cured for 3 days, the base 3 is vibrated and rolled multiple times with a vibratory roller with a wheel load of more than 13 tons. It is 4.8km / h, the area of ​​the base layer 3 being rolled accounts for more than 90% of the total area of ​​the base layer 3. The rigidity test is performed every time the base layer 3 is pressed. When the rigidity of the base layer 3 drops to 60% before the rolling, the rolling is stopped, and then immediately Cover with a film and continue to sprinkle water for curing for more than seven days to restore the stiffness of the base layer 3. At the same time, the mesh micro-cracks can be effectively self-healed through hydration and other reactions, which not only guarantees the required stiffness of the road surface, but also passes through the base layer. Micro-cracks can effectively control the generation of reflective c...

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Abstract

The invention discloses a pre-treatment method for reducing cracks on a semi-rigid base asphalt pavement. The method includes following steps: after basic layer maintenance for 1-3 days, performing vibration rolling to a basic layer with a vibrating roller; and stopping the vibration rolling when rigidity of the basic layer is reduced to 40-60% of the rigidity before vibration rolling or when hair-size net-shaped micro-cracks appear. The micro-cracks obtained in the invention can effectively release energy generated in temperature shrinkage and air shrinkage in the basic layer and reduce generation of early-stage wide cracks, thereby reducing reflection cracks and reducing generation of wide cracks by basic layer shrinkage. The method can enhance a pressure resistance and increase a service life of a pavement.

Description

technical field [0001] The invention relates to the field of road engineering. In particular, it relates to a pretreatment method for reducing cracks in semi-rigid base asphalt pavement. Background technique [0002] With the increasing traffic volume in our country, semi-rigid pavement has become the main pavement structure of my country's high-grade highways. Today, 90% of my country's high-grade highways use semi-rigid base asphalt pavement, and cement-stabilized macadam base accounts for a large proportion. According to statistics, 50% of pavement cracks are reflective cracks caused by damage to the base, so it is particularly important to control the cracks in the semi-rigid base. However, if the stiffness of the semi-rigid base is too low, it is easy to be fatigued and damaged due to the load, and if the stiffness is too high, it is easy to cause dry shrinkage and temperature shrinkage cracks. develop. On the premise of ensuring the strength of the pavement, how to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C21/00
CPCE01C7/187E01C19/28E01C23/03
Inventor 胡迟春喻源王端宜
Owner SOUTH CHINA UNIV OF TECH
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