Interaction behavior between waste rubber powder and asphalt-aggregate interface in dry process

doi:10.16085/j.issn.1000-6613.2024-1189

Abstract

Abstract:

To reveal the microscopic adhesion characteristics and diffusion migration behavior of waste rubber powder and asphalt-aggregate interface during the interaction process in the dry process, a blending model of waste rubber powder and asphalt-aggregate system in the dry process was established based on molecular dynamics simulation technology. The mean square displacement (MSD), diffusion coefficient (MDC), relative concentration distribution, and interface energy evolution law of waste rubber powder and asphalt-aggregate system in the dry process were studied at different temperatures and reaction times. The interfacial separation forming between waste rubber powder and asphalt film in the dry process was analyzed by adhesion test. The results showed that the diffusion behavior between waste rubber powder and asphalt in the dry process exhibited a bidirectional migration process, in which the waste rubber powder gradually diffused to the asphalt layer, and the asphalt gradually integrated with the waste rubber powder and diffused to the aggregate surface, thus forming a stable system. The MSD and MDC during diffusion process increased with the increase of temperature. The initial concentration distribution of waste rubber powder on the surface of aggregate in dry process was extremely high and the concentration gradually decreased over time. The introduction of waste rubber powder changed the distribution of asphalt components on the aggregate surface and effectively improved the interface energy between asphalt and aggregate. In addition, the results of laboratory adhesion test were consistent with the molecular simulation results, which further provided a valuable reference for exploring the interaction between the waste rubber powder and asphalt-aggregate interface in the dry process.

Key words: waste rubber powder, dry process, asphalt-aggregate interface, interaction, molecular dynamics

摘要：

为了揭示干法工艺中废胶粉与沥青-集料界面在相互作用过程中的微观黏附特性及扩散迁移行为，基于分子动力学模拟技术建立了干法工艺中废胶粉与沥青-集料体系的共混模型，研究了其在不同温度、不同作用时间下的均方位移（MSD）、扩散系数（MDC）、相对浓度分布及界面能演变规律。通过黏附性试验分析了干法工艺中废胶粉与沥青膜的界面分离形式。结果表明，干法工艺中废胶粉与沥青的扩散行为体现为双向迁移的过程，废胶粉逐渐向沥青层扩散，沥青亦逐渐融合废胶粉并扩散至集料表面，从而形成稳定体系。扩散过程中的MSD与MDC随温度升高而增大。干法工艺中废胶粉在集料表面的初始浓度分布极高，随时间推移，浓度逐渐下降。废胶粉的引入改变了沥青组分在集料表面的分布，有效提升了沥青与集料之间的界面能。此外，室内黏附性试验结果与分子模拟结果相一致，进一步为探讨干法工艺中废胶粉与沥青-集料界面的相互作用行为提供了有价值的参考。

关键词: 废胶粉, 干法工艺, 沥青-集料界面, 相互作用, 分子动力学

CLC Number:

U414

TIAN Xiaoge, LI Guangyao, GAO Kai, WU Qinghao, HUANG Sidan, XIE Zhen. Interaction behavior between waste rubber powder and asphalt-aggregate interface in dry process[J]. Chemical Industry and Engineering Progress, 2025, 44(9): 5174-5183.

田小革, 李光耀, 高凯, 吴清浩, 黄思丹, 谢振. 干法工艺中废胶粉与沥青-集料界面的相互作用行为[J]. 化工进展, 2025, 44(9): 5174-5183.

Figures/Tables 22

References 22

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指标	规范要求	试验结果	试验方法
针入度（25℃，5s，100g）/0.1mm	60~80	68.1	T 0604—2011
软化点/℃	≥46	49.1	T 0606—2011
延度（15℃）/cm	≥100	＞100	T 0605—2011
相对密度（25℃）/g·cm^-3	实测	1.045	T 0603—2011

指标	规范要求	试验结果	试验方法
针入度（25℃，5s，100g）/0.1mm	60~80	68.1	T 0604—2011
软化点/℃	≥46	49.1	T 0606—2011
延度（15℃）/cm	≥100	＞100	T 0605—2011
相对密度（25℃）/g·cm^-3	实测	1.045	T 0603—2011

指标	测试结果	技术要求
筛余物/%	8	<10
相对密度/g·cm^-3	1.20	1.10~1.30
金属质量分数/%	0.03	<0.05
纤维质量分数/%	0.04	<1.0
灰分/%	6	≤8
橡胶烃/%	51.94	≥48
炭黑/%	32.84	≥28

指标	测试结果	技术要求
筛余物/%	8	<10
相对密度/g·cm^-3	1.20	1.10~1.30
金属质量分数/%	0.03	<0.05
纤维质量分数/%	0.04	<1.0
灰分/%	6	≤8
橡胶烃/%	51.94	≥48
炭黑/%	32.84	≥28

指标	测试结果	技术要求
洛杉矶磨耗值/%	13.8	≤28
坚固性/%	1.7	≤12
针片状颗粒质量分数/%	5.6	≤12
软弱颗粒质量分数/%	1.9	≤3
表观相对密度/g·cm^-3	2.817	≥2.6
吸水率/%	0.4	≤2.0