Solvent-Free Bituminous Emulsion for Compacted Soil Penetration
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Solution Overview
Problem
Existing bituminous emulsions for road applications as penetrating prime solutions often require solvents to penetrate compacted granular bases, leading to instability and delamination of paved layers. Additionally, there is a lack of effective tests to simulate compacted soil for determining penetration.
Innovation Solution
A solvent-free bituminous emulsion using octylphenol ethoxylates as primary emulsifiers, optionally combined with betaines, which can penetrate compacted soil surfaces quickly without the need for solvents. The emulsion is created by selecting a binding material, producing an aqueous phase with the emulsifiers, and emulsifying the binding material within specific phase ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If bitumen viscosity is reduced with diluent to aid penetration, then penetration ability is improved, but solvent evaporation causes instability and delamination of paved layers
Solution Approach 1:
The patent changes the chemical composition parameters by using specific emulsifiers (anionic, cationic, nonionic, or amphoteric) at controlled concentrations (0.05% to 10% by weight) to modify the bituminous emulsion properties. This allows the emulsion to penetrate compacted granular bases effectively while maintaining stability without requiring high levels of volatile solvents
Solution Approach 2:
The patent creates a composite bituminous emulsion system combining bitumen with specific emulsifiers and optional solvents at controlled levels. This composite structure enables the material to achieve both penetration capability and long-term stability, resolving the contradiction between quick penetration and pavement layer stability
2Speed
If emulsified asphalt prime materials include sufficient amounts of solvent to allow penetration into compacted granular base, then penetration ability is improved, but solvent evaporation causes sticky surfaces and delays paving
Solution Approach 1:
The patent optimizes the solvent content parameter within specific ranges (0% to 30% by weight) combined with controlled emulsifier concentrations. This parameter optimization allows the emulsion to penetrate compacted bases effectively while reducing excessive solvent that would cause prolonged stickiness and delays
Solution Approach 2:
The patent uses emulsified bitumen as a substitute for solvent-based cutback asphalt. The emulsion system replicates the penetration function of solvent-based materials but uses water as the primary carrier, which evaporates faster and leaves no residual stickiness, thereby reducing the time required for the surface to toughen
3Stability of the object's composition
If slow setting emulsifiers are used to produce penetrating prime emulsions, then emulsion stability is improved, but penetration into compacted soil is insufficient
Solution Approach 1:
The patent adjusts the emulsifier concentration parameter within the range of 0.05% to 10% by weight and selects from multiple emulsifier types (anionic, cationic, nonionic, amphoteric). This parameter optimization enables the emulsion to maintain stability while achieving sufficient penetration into compacted granular bases, overcoming the limitation of conventional slow-setting emulsifiers
4Reliability
If compaction of soil substrate increases, then road structure stability is improved, but emulsion penetration becomes difficult without solvents
Solution Approach 1:
The patent modifies the emulsion composition parameters including emulsifier type and concentration (0.05% to 10% by weight) and solvent content (0% to 30% by weight) to optimize penetration performance. These parameter adjustments enable effective penetration into highly compacted granular bases while maintaining road structure stability
Solution Approach 2:
The patent develops a composite emulsion formulation that combines bitumen with specifically selected emulsifiers and controlled solvent levels. This composite material achieves the dual function of penetrating compacted bases and providing stable bonding, resolving the contradiction between compaction level and penetration ability
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 solvent-free bituminous emulsion effectively penetrates compacted soil surfaces, toughening them quickly to support the application of paved layers in less than a week, and even potentially in less than an hour. This solution addresses the instability issues caused by solvent evaporation and provides a reliable test method for simulating compacted soil conditions.
Implementation Method 1
the emulsifier comprising octylphenol ethoxylates at a rate of 0.05% to 10% by weight of the bituminous emulsion
Implementation Method 2
emulsifying the binding material in a range of 5% to 75% binding material phase and 10% to 95% aqueous phase to produce the penetrating prime emulsion
Data Source
AI summary
A bituminous emulsion that is capable of being used as a penetrating prime emulsion. The penetrating prime emulsion may be capable of penetrating compacted soil without the use of solvent, and may toughen quickly to allow early application of a paved layer on the surface. The bituminous emulsion may comprise bituminous material and an emulsifier comprising octylphenol ethoxylates, and optionally further comprising tallow diamine betaines or other betaines.