地聚物稳定废旧沥青混合料的强度与微观结构研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (1): 364-372.

所属专题：道路材料

地聚物稳定废旧沥青混合料的强度与微观结构研究

林俊涛¹, 夏宇¹, 李伟², 解传凯²

1.中国地质大学(武汉)工程学院,武汉 430074;
2.山东省高速养护集团有限公司,济南 250032

收稿日期:2022-08-21 修订日期:2022-09-29 出版日期:2023-01-15 发布日期:2023-02-15
作者简介:林俊涛(1985—),男,博士,副教授。主要从事道路工程材料方面的研究。E-mail:linjt@cug.edu.cn
基金资助:
国家自然科学基金(52278285,51908522)

Strength and Microstructure of Geopolymer Stabilized Recycled Asphalt Mixture

LIN Juntao¹, XIA Yu¹, LI Wei², XIE Chuankai²

1. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China;
2. Shandong Expressway Maintenance Group Co., Ltd, Jinan 250032, China

Received:2022-08-21 Revised:2022-09-29 Online:2023-01-15 Published:2023-02-15

摘要/Abstract

摘要： 发展高早强和低能耗的新型绿色道路建筑材料对我国公路建设与养护具有重要意义。本文采用地聚物稳定100%的废旧沥青混合料,制备了地聚物稳定冷再生混合料(GCRM),研究了矿渣掺量、水玻璃模数、激发剂用量以及地聚物掺量对GCRM劈裂强度的影响及其时变规律,通过扫描电子显微镜和EDS能谱分析了混合料的微观形貌及结构组成。结果表明,GCRM的早期强度发展较快,相较于水泥乳化沥青稳定冷再生混合料提升明显。当矿渣掺量为30%(质量分数)、水玻璃模数为1.0、激发剂用量为50%(质量分数)、地聚物总掺量为8%(质量分数)时,GCRM具有最佳的早期强度,7 d劈裂强度可达1.7 MPa。微观结构分析表明,GCRM破坏界面处裂缝易出现在地聚物反应程度偏低的位置。此外,水化硅铝酸钙(C-A-S-H)层状凝胶结构的形成更有利于混合料力学性能的发展。

关键词: 废旧沥青混合料, 地聚物, 冷再生混合料, 道路工程, 强度发展, 微观结构

Abstract: Developing new green road building materials with high early strength and low energy consumption is of great significance to highway construction and maintenance in China. The geopolymer stabilized cold recycled mixture (GCRM) was prepared by using geopolymer to stabilize 100% recycled asphalt mixture in this paper. The effects of slag content, water glass modulus, activator content and geopolymer content on the splitting strength of GCRM with different curing time and its time-varying law were studied. The microscopic morphology and structural composition of the mixture were analyzed by scanning electron microscopy and energy dispersive spectroscopy. The results show that the early strength of GCRM develops rapidly, which is significantly higher than that of cement emulsified asphalt stabilized cold recycled mixture. GCRM has the best early strength and its 7 d splitting strength can reach 1.7 MPa when the slag content is 30% (mass fraction), the water glass modulus is 1.0, the activator content is 50%(mass fraction) and the geopolymer content is 8% (mass fraction). Microstructure analysis shows that the cracks of GCRM failure interface appear in the position with low geopolymer reaction degree. Besides, the calcium aluminosilicate hydrate (C-A-S-H) layered gel structure is more conducive to the development of the mechanical strength for GCRM.

Key words: recycled asphalt mixture, geopolymer, cold recycled mixture, road engineering, strength development, microstructure

中图分类号:

U414

林俊涛, 夏宇, 李伟, 解传凯. 地聚物稳定废旧沥青混合料的强度与微观结构研究[J]. 硅酸盐通报, 2023, 42(1): 364-372.

LIN Juntao, XIA Yu, LI Wei, XIE Chuankai. Strength and Microstructure of Geopolymer Stabilized Recycled Asphalt Mixture[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(1): 364-372.

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地聚物稳定废旧沥青混合料的强度与微观结构研究

Strength and Microstructure of Geopolymer Stabilized Recycled Asphalt Mixture

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