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A road pavement base structure

A technology of road pavement and base layer, which is applied in the direction of roads, roads, and on-site coagulation pavement, etc., can solve the catastrophic quality hidden dangers buried in the pavement quality, cannot meet the requirements of the strength of the pavement base, and destroy the integrity of the pavement base, etc. problems, to achieve the effect of feasible construction technology, considerable economic benefits, and prevention of leaching of harmful salts

Active Publication Date: 2021-04-02
武汉市江夏路桥工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of cement is generally 4.5% to 6% of the mixture, and the strength generally can only reach 4.0MPa, which cannot meet the requirements for the strength of the pavement base in the new "Technical Rules for Construction of Highway Pavement Base" (JTG / T F20-2015)
For cement-stabilized gravel, the only way to increase the strength is to increase the amount of cement. However, after increasing the amount of cement, irregular shrinkage cracks will inevitably occur during the hardening process.
In order to solve the problem of irregular cracks, we have to artificially saw seams, which not only increases the investment cost of the project, but also buryes a catastrophic hidden danger to the quality of the pavement. Crack water seepage will accelerate the damage of the pavement and destroy the integrity of the pavement base

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A road pavement base structure, including base and subbase. Its base layer is composed of 4.5% PCSB curing agent, 20% asphalt waste powder, 45.5% fine aggregate, and 30% coarse aggregate. The 7d compressive strength is 5.5MPa, which meets the high-grade highway heavy traffic standard. The base layer strength is 5.0MPa~7.0 MPa index requirements; the subbase is composed of 3.5% PCSB curing agent, 20% asphalt waste powder, 46.5% fine aggregate, and 30% coarse aggregate, and the 7d compressive strength is 4.0MPa, which meets the pavement bottom of the high-grade highway special heavy traffic standard Base strength 3.0MPa ~ 5.0MPa index.

[0026] Wherein, the fine aggregate is stone chips with a particle size of ≤5 mm, the coarse aggregate is gravel with a particle size of 5-10 mm, and the heat of hydration of the PCSB curing agent is ≤280 j / g.

[0027] The waste powder produced by the Wuhan Jiangxia Road and Bridge Engineering Corporation Lingshan Asphalt Concrete Mixing ...

Embodiment 2

[0029] A road pavement base structure, including base and subbase, the base is composed of 2.8% PCSB curing agent, 20% asphalt waste powder, 42.2% fine aggregate, 35% coarse aggregate, 7d compressive strength 5.3MPa, meeting high The strength of the base layer on the super-heavy traffic standard road surface of grade highways is 5.0MPa~7.0MPa; the subbase layer is composed of 2.5% PCSB curing agent, 18% asphalt waste powder, 41.5% fine aggregate, and 38% coarse aggregate, and can resist compression for 7 days The strength is 4.0MPa, which meets the index of 3.0MPa~5.0MPa for the strength of the base layer under the super-heavy traffic sign of high-grade highways.

[0030] Wherein, the fine aggregate is stone chips with a particle size of ≤5 mm, the coarse aggregate is gravel with a particle size of 5-10 mm, and the heat of hydration of the PCSB curing agent is ≤280 j / g.

[0031]The asphalt waste powder used is waste powder produced by Lingshan Asphalt Concrete Mixing Station o...

Embodiment 3

[0033] A road pavement base structure, including base and subbase, the base is composed of 6.6% PCSB curing agent, 25% asphalt waste powder, 38% fine aggregate, 30.4% coarse aggregate, 7d compressive strength 5.5MPa, meeting high The strength of the base layer on the super-heavy traffic standard road surface of grade highways is 5.0MPa~7.0MPa; the subbase layer is composed of 6.5% PCSB curing agent, 25% asphalt waste powder, 42.5% fine aggregate, and 26% coarse aggregate, 7d compressive strength The strength is 4.0MPa, which meets the index of 3.0MPa~5.0MPa for the strength of the base layer under the super-heavy traffic sign of high-grade highways.

[0034] Wherein, the fine aggregate is stone chips with a particle size of ≤5 mm, the coarse aggregate is gravel with a particle size of 5-10 mm, and the heat of hydration of the PCSB curing agent is ≤280 j / g.

[0035] The gray waste powder produced by the Lingshan Asphalt Concrete Mixing Station of Wuhan Jiangxia Road and Bridge ...

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Abstract

The objective of the invention is to provide a pavement base structure of a road. The pavement base structure comprises a base and a subbase. The pavement base structure is characterized in that the subbase comprises, by mass, 2 to 7.5% of a PCSB curing agent, 15 to 28% of waste asphalt powder, 35 to 50% of fine aggregate and 25 to 40% of coarse aggregate (summing to 100%); and the base comprises,by mass, 2.5 to 8% of the PCSB curing agent, 18 to 30% of waste asphalt powder, 35 to 50% of fine aggregate and 25 to 40% of coarse aggregate (summing to 100%). The pavement base structure can reduceshrinkage cracks, improve the quality of a pavement base and lower engineering cost for the road.

Description

technical field [0001] The invention belongs to the field of roads, and in particular relates to a road pavement base structure. Background technique [0002] Road pavement structure is generally composed of surface course, base course, subbase course and cushion course. Because cement-stabilized macadam has certain advantages in terms of strength, integrity, and durability, it is the most commonly used structural composition of road pavement bases in the past. Cement-stabilized crushed stone uses graded crushed stone as aggregate, uses a certain amount of cement as the gelling agent, fills the gaps in the aggregate with sufficient mortar volume, and paves and compacts the pavement base structure according to the principle of embedded extrusion. The amount of cement is generally 4.5% to 6% of the mixture, and the strength can only reach 4.0MPa, which cannot meet the requirements of the new "Technical Rules for Road Pavement Construction" (JTG / T F20-2015) for the strength of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/26C04B28/10
CPCC04B28/10C04B2111/0075C04B2201/50E01C7/26C04B18/16C04B14/02
Inventor 徐先成张忠敏周涛熊建路江戈光弼王明晖刘震宇周晓华彭涛文胜陈涛彭卫华杨华余国祥文丕珍
Owner 武汉市江夏路桥工程有限公司
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