Study on the reinforcement mechanism and properties of polypropylene/ethylene-vinyl acetate blends replacing styrene-butadiene-styrene for degraded crumb rubber modified asphalt

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-04 DOI:10.1016/j.conbuildmat.2025.143875

Chen Cui , Hongwei He , Jie Ma , Wenwen Yu , Fengbo Zhu , Huayun Du , Lin Liao , Bo Zhang , Yinghua Fan

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引用次数: 0

Abstract

Currently, the performance of asphalt pavement is greatly influenced by environmental temperature and load. Introducing polymer modifiers is an effective strategy to improve road performance. Styrene-Butadiene-Styrene (SBS) is the most widely used polymer modifier, but it is expensive. Therefore, reducing the SBS content or developing alternative materials is one of the effective solutions. In recent years, crumb rubber (CR), degraded crumb rubber (DCR) have been found to be effective, but their road performance and storage stability still need improvement. Waste plastics such as ethylene-vinyl acetate copolymer (EVA) and polypropylene (PP) have shown potential as asphalt modifiers, however, not much research has been done on how they work together with CR or DCR in asphalt. Therefore, this study uses the high temperature rutting resistance of PP and the low temperature anti-cracking of EVA to prepare DCR/PP/EVA composite modified asphalt (PEMA), aiming to improve the high and low temperature performance of asphalt. The effects on the microstructure and rheological properties of asphalt are explored, and the feasibility of PP/EVA replacing SBS is investigated. First, the influence of different PP/EVA ratios on the physical properties of asphalt was explored. The rheological properties and deformation resistance were evaluated using dynamic shear rheometer (DSR) and multiple stress creep and recovery (MSCR). In addition, the compatibility and microstructure of the composite modified asphalt were characterized by segregation experiments and microscopic techniques. The modification mechanism of PEMA was reasonably inferred using Fourier transform infrared spectroscopy (FTIR) and microstructure tests. The results showed that when the content of PP/EVA composite modifier was 6 wt% (PP:EVA = 5:5), its high temperature rutting resistance, low temperature anti-cracking, deformation resistance and elastic recovery ability were all better than SBS/DCR modified asphalt (SDCRMA). The cross linked network formed by DCR, PP and EVA greatly improved the storage stability, outperforming that of SDCRMA. The PP/EVA blend shows potential as a substitute for SBS in the preparation of modified asphalt. This study provides a new way to prepare modified asphalt with good high and low temperature performance with reducing construction costs.

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聚丙烯/乙烯-醋酸乙烯共混物替代丁苯-苯乙烯对降解碎橡胶改性沥青的补强机理及性能研究

目前，沥青路面的性能受环境温度和荷载的影响较大。引入高分子改性剂是改善道路性能的有效策略。苯乙烯-丁二烯-苯乙烯（SBS）是应用最广泛的聚合物改性剂，但价格昂贵。因此，降低SBS含量或开发替代材料是有效的解决方案之一。近年来，碎石橡胶（CR）、降解碎石橡胶（DCR）被发现是有效的，但其路用性能和贮存稳定性仍有待提高。废塑料如乙烯-醋酸乙烯共聚物（EVA）和聚丙烯（PP）已显示出作为沥青改性剂的潜力，然而，关于它们如何与CR或DCR在沥青中协同工作的研究并不多。因此，本研究利用PP的耐高温车辙性和EVA的低温抗裂性制备DCR/PP/EVA复合改性沥青（PEMA），旨在提高沥青的高低温性能。探讨了聚丙烯/EVA对沥青微观结构和流变性能的影响，探讨了聚丙烯/EVA替代SBS的可行性。首先，探讨了不同PP/EVA配比对沥青物理性能的影响。采用动态剪切流变仪（DSR）和多重应力蠕变与恢复（MSCR）对其流变特性和抗变形性能进行了评价。此外，通过偏析实验和显微技术对复合改性沥青的相容性和微观结构进行了表征。利用傅里叶变换红外光谱（FTIR）和微观结构测试，合理推断了PEMA的改性机理。结果表明，当PP/EVA复合改性剂的掺量为6 wt% （PP:EVA = 5:5）时，其高温抗车辙性、低温抗裂性、抗变形性和弹性恢复能力均优于SBS/DCR改性沥青（SDCRMA）。DCR、PP和EVA形成的交联网络大大提高了存储稳定性，优于SDCRMA。PP/EVA共混物在制备改性沥青方面具有替代SBS的潜力。本研究为制备高低温性能良好、降低施工成本的改性沥青提供了一条新途径。

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来源期刊

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.