Recycled Asphalt Concrete Flat Particle Reduction
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Solution Overview
Problem
The existing methods for manufacturing asphalt concrete often result in high amounts of flat and elongated particles in aggregates, which negatively impact the quality and durability of the concrete, necessitating a method to minimize these particles to achieve first-grade asphalt concrete.
Innovation Solution
A manufacturing method that combines first-grade natural aggregates, recycled aggregates, and polymer control material (PCM) at specific ratios to reduce the percentage of flat and elongated particles below 10%, where PCM is composed of recycling additives, modified additives, dispersants, and peel reducing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If recycled aggregates are used to manufacture asphalt concrete, then resource utilization is improved and waste reduction is achieved, but the amount of flat and elongated particles increases reducing concrete quality
Solution Approach 1:
The patent changes the physical-chemical parameters of recycled aggregates by applying surface treatment with specific additives and controlling heating temperature (150-170°C) and mixing time (30-60 seconds) to modify the surface properties of flat and elongated particles, improving their bonding characteristics and reducing their negative impact on concrete quality while maintaining resource utilization benefits
Solution Approach 2:
The patent creates a composite aggregate system by combining recycled aggregates with natural aggregates in specific ratios (recycled aggregates: 30-70% by weight, natural aggregates: 30-70% by weight), where the natural aggregates compensate for the shape deficiencies of recycled aggregates, achieving both resource utilization and quality requirements
2Reliability
If the amount of flat and elongated particles is reduced to achieve first-grade quality, then concrete durability is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent performs preliminary treatment of recycled aggregates before final mixing by pre-heating them to 150-170°C and pre-mixing with additives (0.1-0.5% by weight of aggregate mass) to modify surface properties in advance, reducing the need for complex post-processing and simplifying the overall manufacturing process while ensuring quality
Solution Approach 2:
The patent introduces intermediary materials including specific additives (0.1-0.5% by weight of aggregate mass) and natural aggregates as mediators between recycled aggregates and the final concrete product, facilitating the incorporation of recycled materials while maintaining quality standards through the buffering effect of these intermediaries
Data Source
AI summary
The present invention relates to recycled asphalt concrete and a manufacturing method therefor and, more specifically, to recycled and regenerated asphalt concrete and a manufacturing method therefor, which minimizes the amount of flat and elongated particles included in aggregates used as materials for asphalt concrete, thereby increasing the quality of the asphalt concrete to first grade (the amount of the flat and elongated particles is less than 10%) and increasing the durability of the asphalt concrete.