基于离散元法的非热平衡条件下热再生沥青混合料的温度和接触状态

IF 8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jiangyu Liu , Quan Liu , Long Yin , Jiantao Wu
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引用次数: 0

摘要

热再生沥青混合料(HRAM)的混合对其性能起着至关重要的作用,特别是在非均匀温度环境和高RAP含量的情况下。因此,研究HRAM的混合工艺以实现高质量的HRAM生产势在必行。在本研究中,采用DEM方法模拟了RAP温度分别为353 K、373 K和393 K, RAP含量分别为20 %、40 %和60 %的混合过程。对温度分布进行了统计分析。此外,为了表示粒子接触状态,引入了接触数统计和配位数指标。研究表明,随着搅拌时间的延长,沥青混合料颗粒温度分布逐渐集中,平均温度逐渐降低。在本研究中检查的所有情况下,温度场分布的转折点在大约50 秒时被观察到。在有限的混合时间90 秒内没有发现完全的热平衡。粒子间的相互作用在混合初期发生了显著的变化,并在最终状态下趋于稳定,这一过程受RAP含量和预定RAP温度的共同影响。引入的ANN(平均近邻分析)指数可以作为表征热再生沥青混合料混合特性的关键指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature and contact states of hot-recycled asphalt mixing at a non-thermal equilibrium condition based on discrete element method
The mixing of hot recycled asphalt mixture (HRAM) plays a critical role in its performance, particularly in non-uniform temperature environments and high RAP content scenarios. Therefore, it is imperative to investigate the mixing process of HRAM to achieve high-quality production of HRAMs. In this study, the DEM method was employed to simulate the mixing process of HRAMs with predetermined RAP temperatures of 353 K, 373 K, and 393 K, and varying RAP contents at 20 %, 40 %, and 60 %. Statistical analysis of temperature distribution was conducted. Additionally, for representation of particle contact state, contact number statistics and coordination number indicators were introduced. The study revealed that with increasing mixing time, the temperature distribution of asphalt mixture particles gradually concentrated and the average temperature decreased. In all cases examined in this study, a turning point in the temperature field distribution was observed at approximately 50 seconds. Complete thermal equilibrium was not found in a limited mixing time of 90 seconds. The interaction between particles underwent significant changes during the initial stages of mixing and stabilized in the final state, which was influenced by both the RAP content and predetermined RAP temperatures. The ANN (Average Nearest Neighbour Analysis) index introduced can serve as a crucial indicator to characterize the mixing of hot-recycled asphalt mixtures.
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来源期刊
Construction and Building Materials
Construction and Building Materials 工程技术-材料科学:综合
CiteScore
13.80
自引率
21.60%
发文量
3632
审稿时长
82 days
期刊介绍: Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.
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