Bituminous Pavement Anti-Icing Material with Slow Release Coating
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Solution Overview
Problem
Existing anti-icing materials for bituminous pavements, such as Verglimit, corrode steel bars and lack effective slow release mechanisms, posing economic and environmental concerns.
Innovation Solution
A slow release anti-icing material comprising chloride (sodium chloride, potassium chloride, or calcium chloride) combined with an anti-corrosion agent (sodium silicate, sodium gluconate, and zinc dihydrogen phosphate) and an acrylate polymer, which forms a thermostable coating that inhibits icing without corroding steel bars, using a simple and cost-effective production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-icing materials (Verglimit, calcium chloride-based materials) are used to prevent pavement icing, then anti-icing effect is achieved, but steel bars are corroded and environment is contaminated
Solution Approach 1:
The patent uses a composite material system consisting of microcapsules containing anti-icing agents (calcium chloride, sodium chloride, or potassium chloride) embedded in a bituminous binder. This composite structure allows the anti-icing functionality to be integrated into the pavement material itself, releasing chloride ions slowly to prevent icing while reducing direct contact with steel bars and environmental contamination.
Solution Approach 2:
The bituminous binder acts as an intermediary medium that encapsulates the chloride-based anti-icing agents. This intermediary structure controls the release of chloride ions, providing anti-icing protection while minimizing direct exposure to steel reinforcement and surrounding environment, thus reducing corrosion and contamination.
2Reliability
If anti-icing materials are applied to prevent pavement icing, then driving safety is improved, but severe destruction and contamination on roadways and surrounding environment occur
Solution Approach 1:
The anti-icing agents are pre-encapsulated in microcapsules and integrated into the bituminous pavement during construction. This preliminary action ensures that anti-icing protection is already in place before icing occurs, allowing for controlled, slow release of chloride ions that prevent icing without causing severe destruction or contamination to roadways and environment.
Solution Approach 2:
The bituminous binder serves as an intermediary that controls the interaction between anti-icing agents and the environment. This intermediary structure enables the material to provide driving safety through controlled anti-icing action while minimizing harmful effects on roadways and surrounding environment.
3Reliability
If chloride-based anti-icing materials are used to melt snow and ice, then temporary anti-skid effect is achieved, but corrosion of steel bars is inevitable
Solution Approach 1:
The bituminous binder acts as an intermediary barrier between the chloride-based anti-icing agents and the steel reinforcement. This intermediary structure allows the material to provide anti-skid effect through chloride ion release while significantly reducing direct contact with steel bars, thereby preventing corrosion.
Solution Approach 2:
The bituminous binder forms a flexible matrix that encapsulates the anti-icing agents and provides a protective barrier. This thin film structure controls the release of chloride ions, enabling anti-skid functionality while protecting steel bars from corrosion through the barrier effect of the bituminous material.
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
The material effectively prevents icing on bituminous pavements at temperatures as low as -5 to 0°C, is environmentally friendly, and does not corrode steel bars, as verified by corrosion tests and field applications, demonstrating a green and economic solution for winter road safety.
Implementation Method 1
Z component is a layer of a uniform, compact, spatially reticular, thermostable, macromolecular coating material formed on the surface of the mixture of components X and Y, controlling a releasing rate of the anti-icing material in the bituminous pavement
Implementation Method 2
The anti-icing material effectively prevents icing on bituminous pavements at temperatures as low as -5 to 0°C
Data Source
AI summary
A slow release anti-icing material for a bituminous pavement and a method of manufacturing the same. The material includes X, Y and Z components. The X component is a chloride of 80-95 parts. The Y component comprises sodium silicate sodium gluconate and zinc dihydrogen phosphate. The Z component is an acrylate polymer obtained from polymerization of an acrylate monomer, as a cross-linking agent, and a hydrogen containing silicone oil. The manufacturing method includes preparing the X component, preparation the Y component, mixing the X component and the Y component evenly, and encapsulating the surface of the mixture of component X and Y by the component Z evenly through polymerization, to produce the slow release anti-icing material for a bituminous pavement. The anti-icing effects are remarkable for the bituminous pavement, and the material has effects of completely preventing the pavement from icing at −5 to 0° C.