Bituminous Composition with Amine and Hydroxide Additives
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Solution Overview
Problem
Bituminous compositions used as binders in road applications are prone to degradation over time due to oxidation, leading to decreased mechanical properties such as softening temperature and penetrability, resulting in cracking and pothole formation.
Innovation Solution
A bituminous composition comprising bitumen, a hydroxide (Na, Ca, Mg, or K) hydroxide, and an amine additive (amines, diamines, polyamines, or amidopolyamines) is developed, which is substantially free of saponifiable and saponified carboxylic acids, with the amine additive and hydroxide improving the stability of the bitumen's mechanical properties under external solicitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bituminous compositions are used as binders in road applications, then they provide binding and structural support, but they degrade over time due to oxidation leading to decreased mechanical properties
Solution Approach 1:
The patent applies preliminary action by incorporating oxidation inhibitors and stabilizers into the bituminous composition before application. These additives preemptively protect the bitumen from oxidation during service, preventing degradation before it occurs. The composition includes specific additives that react with or neutralize oxidizing agents, thereby maintaining mechanical properties throughout the service life of the road binder.
2Reliability
If oxidation resistance is improved through additives, then stability over time is enhanced, but mechanical properties may deteriorate
Solution Approach 1:
The patent employs parameter changes by carefully controlling the dosage and concentration of additives in the bituminous composition. By optimizing the amount of oxidation inhibitors and stabilizers, the patent achieves enhanced stability over time while maintaining or improving mechanical properties. The specific parameters of additive concentration and composition ratios are tuned to prevent the trade-off between stability and strength.
3Force
If saponifiable carboxylic acids are used to improve adhesion, then adhesive force increases, but stability and mechanical properties deteriorate
Solution Approach 1:
The patent applies the taking out principle by removing or eliminating saponifiable carboxylic acids from the bituminous composition. These acids, while providing initial adhesion, are identified as causing long-term degradation and instability. The patent achieves adhesion through alternative mechanisms such as physical bonding and use of non-saponifiable additives, thereby improving both adhesive force and long-term stability simultaneously.
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 composition maintains or improves the adhesive force and resistance to cracking and pothole formation, while enhancing the stability of penetrability and softening temperature, effectively addressing the degradation issues of bituminous binders.
Implementation Method 1
U.S. Pat. Nos. 5,437,717, 5,496,400 and CN 102558887 proposed to use a combination of additives including a saponifiable carboxylic acid, in particular from tall oil, with a strong base for saponifying them
Implementation Method 2
fatty amines were added, for improving the saponification of tall oil and rendering compatible the tall oil with the bitumen
Data Source
AI summary
The invention concerns bituminous compositions comprising:a bitumen,a hydroxide XOH, with X═Na, Ca, Mg, Li or K, andat least one amine additive selected from amines, diamines, polyamines, alkyl amido amines, amidopolyamines and imidazolines, wherein said bituminous composition is substantially free of saponifiable and saponified carboxylic acids, meaning that, if present, the weight of saponifiable and saponified carboxylic acids represents at most 0.01% of the total weight of said bituminous compositionand the bitumen represents at least 60% by weight of said bituminous composition, their preparation process and their use in road applications.