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A Design Method for Cement Stabilized Recycled Aggregate Base or Subbase

A technology of recycled aggregate and cement stabilization, which can be applied to coagulable pavements, roads, roads and other directions paved on site, and can solve problems such as failure to achieve fatigue cracking.

Active Publication Date: 2017-12-12
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has simple steps, reasonable design based on the technical properties of construction waste recycled aggregate, low input cost, easy operation and good use effect, and can effectively solve the problem that the existing cement-stabilized recycled aggregate base or subbase design method cannot realize the pavement Integrating structure and materials to control fatigue cracking defects

Method used

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  • A Design Method for Cement Stabilized Recycled Aggregate Base or Subbase
  • A Design Method for Cement Stabilized Recycled Aggregate Base or Subbase
  • A Design Method for Cement Stabilized Recycled Aggregate Base or Subbase

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] A design method for cement-stabilized recycled aggregate subbase, the method flow is referred to figure 1 , the specific steps are as follows.

[0074] Step 1: Determine the thickness of the pavement structure combination and the cement-stabilized recycled aggregate subbase.

[0075] (1) Traffic Analysis

[0076] Table 1 shows the average daily traffic volume and vehicle types of a newly-built expressway in the first year of its opening (2013).

[0077] Table 1 Traffic volume and vehicle composition in the first year of operation

[0078]

[0079]The combined design of the pavement structure takes the standard axle load (BZZ-100) of 100kN on the single axle of the double wheel set, and converts various axle loads into standard axle loads. The axle load conversion results of deflection and semi-rigid base layer tensile stress are as follows: Table 2 and Table 3 are shown.

[0080] Table 2 Axle load conversion result table (deflection)

[0081]

[0082]

[0...

Embodiment 2

[0141] Another design method for cement-stabilized recycled aggregate subbase, the method flow refers to figure 1 , the specific steps are as follows.

[0142] Step 1: Determining the combination of pavement structure and the thickness of cement-stabilized recycled aggregate base.

[0143] (1) Traffic analysis

[0144] Table 12 shows the average daily traffic volume and vehicle types in the first year (2013) of a newly-built secondary highway design.

[0145] Table 12 Traffic Volume and Vehicle Composition in 2013

[0146]

[0147]

[0148] The combination design of the pavement structure takes the standard axle load of 100kN on the single axle of the double-wheel set (BZZ-100), and converts various axle loads into standard axle loads. The results are shown in Table 13 and Table 14:

[0149] Table 13 Axle load conversion result table (deflection)

[0150]

[0151] Table 14 Axle load conversion results (semi-rigid base layer bottom tensile stress)

[0152]

[0...

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Abstract

The invention relates to the technical field of construction waste reuse, and specifically discloses a design method for a cement-stabilized recycled aggregate base or subbase. Step 1, determine the material and thickness of each structural layer of the pavement structure; Step 2, establish a calculation model according to the material and thickness of each structural layer, and determine the 7d splitting strength design standard and 7d design standard for unconfined compressive strength; step 3, carry out the gradation composition design of the cement-stabilized recycled aggregates of the base or subbase, and calculate and determine which meets the 7d splitting strength design standard and the 7d unconfined compressive strength design standard Design cement dosage Copt of cement-stabilized recycled aggregate; if Copt≤6%, the design is passed; if Copt>6%, adjust the gradation composition design of cement-stabilized recycled aggregate so that Copt≤6%. The method is rationally designed according to the technical properties of the construction waste recycled aggregate, and the input cost is low, the operation is simple and the use effect is good.

Description

technical field [0001] The invention relates to the technical field of construction waste reuse, and specifically discloses a design method for a cement-stabilized recycled aggregate base or subbase. technical background [0002] Construction waste refers to the solid waste generated in the construction and demolition of buildings (structures), road construction and renovation, concrete production and engineering construction. The construction and demolition of civil engineering will produce a large amount of construction waste. my country is in the peak period of construction, and the construction waste generated every year reaches 600 million tons, of which the abandoned cement concrete accounts for more than 60%. [0003] Recycled Concrete Aggregate (RCA) refers to aggregates with a particle size of less than 40mm formed from waste cement concrete in construction waste after sorting, ribbing, crushing, and grading, including recycled coarse aggregate (4.75mm≤granular dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/04
CPCE01C7/10
Inventor 纪小平刘永红侯月琴宿秀丽刘陵庆
Owner CHANGAN UNIV
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