在热混合回收青混合物中,对处女和老化的聚合物之间的混合进行定量评估
Haoyang Zou1,2, Yunlong Sui1, Wei Lu3
1Shandong Key Laboratory of Technologies and Systems for Intelligent Construction Equipment, Shandong Jiaotong University, Ji'nan 250357, China.
Materials (Basel, Switzerland)
|December 11, 2025
概括
在回收青路面 (RAP) 中实现统一的聚合物混合是具有挑战性的. 优化混合条件,如温度和时间,可以提高聚合物的混合效率,但过度的热量或时间会导致青的二次老化.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 在回收青路面 (RAP) 中,青的老化和颗粒聚合阻碍了在热回收过程中均的聚合物混合.
- 这损害了再生青混合物的耐用性和性能.
- 优化回收过程对于可持续的基础设施发展至关重要.
研究的目的:
- 提出并验证一种测试方法,用于量化热回收青中处女和老化料的混合程度.
- 研究各种混合参数对聚合物混合效率的影响.
- 确定最佳的混合条件,以提高再生青混合物的性能.
主要方法:
- 开发了一种多步测试方法,涉及混合物制备,材料分离 (原始/老化聚合物,粘合剂/聚合物) 和混合度计算.
- 分析了再生青路面 (RAP) 含量,再生剂,混合温度,混合时间和青含量对混合效率的影响.
- 评估了不同混合序列对聚合物混合的影响.
主要成果:
- 处女和老化的聚合物的完全均化是无法实现的;混合效率在40%到60%之间.
- 增加RAP含量对混合效率的影响最小.
- 优化复原剂,混合温度,时间和青含量,使混合效率提高了10-30%.
- 一个特定的混合序列 (RAP与初始聚合物首先) 增强了~20%的混合.
- 温度>160°C和时间>270s导致了二次青老化,对混合产生了负面影响.
结论:
- 一种新的方法准确量化了回收青中的聚合物混合.
- 最佳的混合参数显著提高了原始和老化的聚合物的混合效率.
- 避免过高的温度和混合时间对于防止二次青老化和保持混合质量至关重要.
相关概念视频
Toughness and Hardness of Aggregate
566
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
566
Bonding and Strength of Aggregate
437
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
437
Types of Aggregate Grading
1.4K
Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
1.4K
Design Example: Aggregate Gradation
284
The right type and quality of aggregates are crucial for concrete as they significantly influence its properties, mix proportions, and cost-effectiveness. If different sources are available for sand, the commonly used fine aggregate in concrete, the selection of sand is primarily based on its gradation.
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
The grading, or particle-size distribution, of sand is determined using sieve analysis, with standard sizes ranging from 150 μm to 10 mm (ASTM No. 100 sieve to 3⁄8 in. sieve). Sand is...
284
Aggregate Cement Ratio
513
The Aggregate Cement ratio refers to the weight of aggregate divided by the weight of cement in a concrete mix. Altering this ratio has profound effects on the concrete's properties. This ratio plays a pivotal role in determining the strength, workability, and durability of concrete. When the Aggregate Cement ratio is higher, the mix is leaner, meaning it has less cement paste to lubricate the aggregate, potentially making the concrete less workable. Such mixes, known as lean, enhance the...
513
Porosity and Absorption of Aggregate
710
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
710


