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Design method of cement stabilization recycled concrete aggregate (RCA) 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: 2015-03-04
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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  • Design method of cement stabilization recycled concrete aggregate (RCA) base or subbase
  • Design method of cement stabilization recycled concrete aggregate (RCA) base or subbase
  • Design method of cement stabilization recycled concrete aggregate (RCA) base or subbase

Examples

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]

[00...

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 recycling, and particularly discloses a design method of a cement stabilization recycled concrete aggregate (RCA) base or subbase. The design method comprises the steps: step one, determining materials and thicknesses of all structural layers of a pavement structure; step two, establishing a calculating model according to the materials and the thicknesses of all the structural layers, and determining the 7d cleavage strength design criteria and 7d unconfined compressive strength design criteria of the cement stabilization RCA base or subbase according to the calculating model; step three, carrying out the gradation composition design for the cement stabilization RCA on the base or subbase, and calculating and determining the design cement dosage Copt of the cement stabilization RCA, meeting the 7d cleavage strength design criteria and 7d unconfined compressive strength design criteria; the design is passed if Copt is smaller than or equal to 6%; if Copt is greater than 6%, the gradation composition design for the cement stabilization RCA is regulated to enable Copt to be smaller than or equal to 6%. By adopting the method, design is carried out rationally according to the technical nature of the construction waste RCA, the investment cost is low, use and operation are easy and 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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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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