Pavement base structure of road

A road pavement and base-level technology, applied to roads, roads, on-site paved coagulation pavements, etc., can solve the problems of failure to meet the strength requirements of the road base, catastrophic hidden dangers of pavement quality, and damage to 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 salt substances

Active Publication Date: 2018-09-25
武汉江夏路桥工程总公司
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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 layer structure includes a base layer and a bottom base layer. The 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 special heavy traffic standard. The pavement base strength is 5.0MPa~7.0 MPa index requirements; its base layer is composed of PCSB curing agent 3.5%, asphalt waste powder 20%, fine aggregate 46.5%, coarse aggregate 30%, 7d compressive strength 4.0MPa, meeting the high-grade highway special heavy traffic standard pavement bottom Base layer strength is 3.0MPa~5.0MPa index.

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

[0027] The waste powder produced by the Lingshan Asphalt Concrete Mixing Station of Wuhan Jiangxia Roa...

Embodiment 2

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

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

[0031] The asphalt waste powder is the waste pow...

Embodiment 3

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

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

[0035] The waste powder is collected from the gray waste ...

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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 road field, and specifically relates to a road pavement base layer structure. Background technique [0002] The road pavement structure is generally composed of surface layer, base layer, bottom base layer and cushion layer. Because cement stabilized crushed stone has certain advantages in strength, integrity, durability, etc., it is the most commonly used structural composition of the road pavement base in the past. Cement stabilized crushed stone is made of graded crushed stone as aggregate, a certain amount of cement is used as a gelling agent, and sufficient mortar volume is used to fill the voids of the aggregate, and the pavement base structure formed by paving and compaction is laid according to the principle of embedding. The amount of cement is generally 4.5% to 6% of the mixture, and the strength can generally only reach 4.0MPa, which cannot meet the requirements of the new "Highway Pavement Base Construction Technica...

Claims

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Application Information

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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 武汉江夏路桥工程总公司
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