Bituminous Mastic Composition for Crack Sealing
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Solution Overview
Problem
Conventional bituminous mastics used for road and construction applications lack suitable plasticity, high penetrability, low viscosity, good creep resistance, rutting resistance, and cracking resistance, making them inadequate for effectively sealing and repairing cracks while maintaining structural integrity.
Innovation Solution
A bituminous mastic composition comprising 0.5% to 25% hydrocarbon oil with a high content of paraffinic compounds, 15% to 60% bitumen, 20% to 60% fillers, and up to 14% polymer, specifically using synthetic oils from deasphalting unit cuts and block copolymers, which are heated and mixed to achieve improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bituminous mastic is used for crack sealing, then the material can fill discontinuities, but it lacks suitable plasticity and has high viscosity which prevents effective stress absorption and cracking resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the bituminous mastic by incorporating specific polymers (polyester, polyamide, polyurethane) and adjusting the bitumen grade and filler composition. This modifies the material's viscosity and plasticity parameters to achieve both ease of application and cracking resistance under stress.
Solution Approach 2:
The patent creates a composite bituminous mastic combining multiple components: bitumen, polymers (polyester, polyamide, polyurethane), fillers (silica, limestone, marble), and optional additives. This composite structure provides both the filling capability and the stress absorption/plasticity needed for crack resistance.
2Object-affected harmful factors
If bituminous mastic is used to seal cracks, then water penetration can be prevented, but the material cannot effectively absorb structural stresses without transmitting them to the structure
Solution Approach 1:
The patent modifies the elastic modulus and plasticity parameters of the bituminous mastic through polymer addition and bitumen grading. This enables the material to absorb structural stresses while maintaining its sealing capability against water penetration.
Solution Approach 2:
The composite structure with polymers and bitumen creates a material that combines the waterproofing properties of bitumen with the stress-absorbing elasticity of polymers, allowing the mastic to seal cracks while absorbing structural movements without transmitting stresses to the underlying structure.
3Reliability
If the bituminous mastic is made more plastic to improve stress absorption, then cracking resistance improves, but the material may lose rigidity and structural integrity
Solution Approach 1:
The patent precisely controls the plasticity parameters through selective polymer addition and bitumen grading, achieving the right balance between flexibility for stress absorption and rigidity for structural integrity. The filler content and type are also optimized to maintain compositional stability.
Solution Approach 2:
The composite formulation combines bitumen's binding properties with polymers' elasticity and fillers' structural support. This balanced composite structure provides both the plasticity needed for stress absorption and the rigidity to maintain structural integrity, preventing excessive deformation.
4Ease of manufacture
If conventional bituminous mastic is used, then the preparation process is simple, but the material lacks improved mechanical properties such as low Fraass point and high penetrability
Solution Approach 1:
The patent optimizes preparation parameters including heating temperature (150-200°C), mixing time (5-30 minutes), and component ratios to achieve homogeneous distribution of polymers and fillers. This controlled preparation process delivers improved mechanical properties while maintaining operational simplicity.
Solution Approach 2:
The composite bituminous mastic combines bitumen, polymers (polyester, polyamide, polyurethane), and fillers (silica, limestone, marble) in optimized ratios. This composite structure provides enhanced mechanical properties including low Fraass point and high penetrability while maintaining a relatively simple preparation process.
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 solution provides a bituminous mastic with enhanced mechanical properties, including a low Fraass fragility point, high penetrability, and improved cracking and rutting resistance, effectively sealing and repairing cracks while maintaining structural integrity.
Implementation Method 1
a bituminous mastic which is capable of absorbing the stresses that may appear in one of the elements of the structure without transmitting them to the rest of the structure
Data Source
AI summary
The invention relates to a bituminous mastic comprising: - from 0.5% to 25% by mass of at least one hydrocarbon oil, the total content of paraffinic compounds of which, measured according to the ASTM d2140 method, is greater than or equal to 50% by mass, and preferably greater than or equal to 60% by mass, relative to the total mass of the oil, - from 15% to 60% by mass of bitumen, - from 20% to 60% by mass of fillers, and - at most 14%, by mass of at least one polymer, preferably chosen from elastomers, relative to the total mass of bituminous mastic. The invention also relates to a method for preparing such a bituminous mastic and to the uses thereof, in particular in certain road and/or industrial applications.