Recycled Pavement Layer Moisture Adjustment for Heavy Equipment Compaction
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Solution Overview
Problem
Conventional recycling construction methods for pavement layers face challenges in achieving sufficient compaction and mobility of heavy construction equipment due to excessive moisture content in recycled aggregates, leading to reduced construction efficiency and constructability.
Innovation Solution
Incorporating a water-absorbing material into the recycled aggregate to adjust the apparent moisture content to a target level, ensuring compaction and mobility equivalent to optimal moisture content without removing excess moisture from the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing pavement is excavated and crushed when it contains high moisture content, then the recycled aggregate can be produced quickly, but the moisture content of the mixture will exceed the optimum moisture content, making it difficult to compact and reducing constructability
Solution Approach 1:
A water-absorbing material is introduced as an intermediary substance to be mixed with the recycled aggregate. This material absorbs excess moisture from the mixture, acting as a mediator between the high-moisture recycled aggregate and the additives (asphalt emulsion or cement), enabling the mixture to achieve optimal compaction properties even when the recycled aggregate contains excessive moisture
Solution Approach 2:
The invention changes the moisture absorption parameter of the mixture by adding a water-absorbing material. This material alters the overall moisture characteristics of the mixture, allowing it to maintain appropriate fluidity and compaction properties despite the high initial moisture content of the recycled aggregate
2Manufacturing precision
If the moisture content of the mixture is reduced by conventional methods (delaying construction, removing wet materials, or aerating with stabilizer), then the optimum moisture content can be achieved, but a great deal of labor and time is required, substantially decreasing construction efficiency
Solution Approach 1:
The water-absorbing material serves as an intermediary that directly addresses the moisture issue without requiring time delays or labor-intensive removal processes. It chemically or physically binds with excess moisture in situ, providing a quick solution that maintains construction efficiency while achieving proper moisture content control
Solution Approach 2:
The water-absorbing material extracts or removes excess moisture from the mixture through absorption, effectively separating the harmful excess moisture from the mixture components without requiring physical removal of materials or waiting for natural evaporation
3Ease of operation
If the moisture content of the mixture is too high, then the fluidity of the mixture increases, but it becomes difficult for heavy construction equipment to run over the mixture, resulting in inability to perform construction with heavy construction equipment
Solution Approach 1:
The water-absorbing material changes the moisture parameter of the mixture, reducing fluidity and increasing stiffness to a level that allows heavy equipment to operate. This parameter change transforms the mixture from a overly fluid state to an optimal construction state without requiring moisture removal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient construction of a recycled pavement layer with desired physical properties and constructability, maintaining construction efficiency despite high initial moisture content.
Implementation Method 1
a water-absorbing material to the recycled aggregate so that an apparent moisture content of the recycled aggregate corresponds to a target moisture content when a moisture content of the recycled aggregate exceeds the target moisture content
Implementation Method 2
water-absorbing material absorbs moisture from the recycled aggregate, adjusting the apparent moisture content
Data Source
AI summary
The present invention aims to provide a recycling construction method for a pavement layer that enables construction of a recycled pavement layer even when an existing pavement to be recycled appears to have excessive moisture by ensuring sufficient compaction and mobility of heavy construction equipment; and a recycled pavement layer obtained by the method. The present invention attains the above object by providing a recycling construction method for a pavement layer comprising a step of adding a water absorbing material to a recycled aggregate such that an apparent moisture content of the recycled aggregate matches a target moisture content, when a moisture content of the recycled aggregate exceeds the target moisture content, wherein the apparent moisture content is obtained by excluding the mass of moisture absorbed by the water-absorbing material; and a pavement layer obtained by the method.