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On-line Access: 2025-01-21

Received: 2023-11-20

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Jiankun LIU

https://orcid.org/0000-0002-3064-8575

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Journal of Zhejiang University SCIENCE A

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Expansion mechanism of sulfate attack on cement-treated aggregates under freeze–thaw cycles


Author(s):  Qi WANG, Jiankun LIU, Xu LI, Pengcheng WANG, Jingyu LIU, Mingzhi SUN

Affiliation(s):  Research Institute of Highway Ministry of Transport, Beijing100088, China; more

Corresponding email(s):  liujiank@mail.sysu.edu.cn

Key Words:  Sulfate attack; Freeze–thaw (FT) cycle; Expansion; Cement-treated aggregates; Dominant factors


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Qi WANG, Jiankun LIU, Xu LI, Pengcheng WANG, Jingyu LIU, Mingzhi SUN. Expansion mechanism of sulfate attack on cement-treated aggregates under freeze–thaw cycles[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2300590

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doi="https://doi.org/10.1631/jzus.A2300590"
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Abstract: 
Sulfate attack-induced expansion of cement-treated aggregates in seasonally frozen regions is a well-known issue which causes continuous expansion in railway subgrades, and particularly in high-speed railways. Accordingly, we investigated the influence of material proportions, the number of freeze‍–‍thaw (FT) cycles, and temperature gradients on the expansion mechanism of sulfate attack on cement-treated aggregates subjected to FT cycles. The conditions, laws, and dominant factors causing the expansion of aggregates were analyzed through swelling tests. The results indicate that under FT cycles, 3% content cement-treated graded macadam only experiences slight deformation. The maximum strain of graded macadam attacked by 1% sodium sulfate content in each FT cycle is significantly larger than that of 3% content cement-treated graded macadam attacked by 1% sodium sulfate content. Using scanning electron microscopy, needle-like crystals were observed during sulfate attack of cement-treated graded macadam. Through quantitative analysis, we determined the recoverable and unrecoverable deformations of graded macadam under FT cycles. For graded macadam under sulfate attack, the expansion is mainly induced by periodic frost heave and salt expansion, as well as salt migration. For cement-treated graded macadam under sulfate attack, the expansion is mainly induced by chemical attack and salt migration. This study can serve as a reference for future research on the mechanics of sulfate attack on cement-treated aggregates that experience FT cycles, and provide theoretical support for methods that remediate the expansion induced by sulfate attack.

冻融循环条件下硫酸盐侵蚀水泥处理集料膨胀特性研究

作者:王麒1,刘建坤2,4,李旭3,王鹏程5,刘景宇5,孙明志1
机构:1交通运输部公路科学研究院,中国北京,100088;2中山大学土木工程学院,中国广州,510006;3北京交通大学土木建筑工程学院,中国北京,100044;4隧道工程灾变防控与智能建养全国重点实验室,中国广州,510275;5中国铁道科学研究院集团有限公司,中国北京,100081
目的:近年来,我国季节冻土区多条无砟轨道线路的水泥处理集料在硫酸盐侵蚀下发生了膨胀变形问题,引起了轨道结构持续上拱病害,严重影响了线路的运营。本文考虑冻融循环次数、温度梯度、材料配比等因素,对冻融循环和硫酸盐复合作用下集料的硫酸盐侵蚀膨胀变形条件、规律和主控因素进行研究。本研究对硫酸盐侵蚀条件下水泥处理集料膨胀变形的治理提供了重要的理论依据。
创新点:1.通过对填料的可恢复、不可恢复变形行为进行划分,实现对冻融循环条件下硫酸盐侵蚀水泥处理集料膨胀变形主控因素的定量化研究。2.试验发现,冻融循环条件下硫酸盐侵蚀水泥处理集料所引起的膨胀变形主要由化学侵蚀和盐分迁移所导致。
方法:1.考虑冻融循环次数、温度梯度和材料配比等因素,通过室内膨胀试验,对仅掺水泥、仅掺硫酸钠、以及同时掺入水泥和硫酸钠共三种条件下集料的膨胀变形条件和规律进行研究;2.考虑芒硝晶体、冰晶体、膨胀性矿物的生成以及水盐迁移等作用,通过对填料的可恢复、不可恢复变形行为进行划分,对膨胀变形主控因素进行定量化研究;3.通过电镜扫描测试,对硫酸盐侵蚀水泥处理集料生成物的微观形貌特征进行研究。
结论:1.冻融循环条件下硫酸盐侵蚀不含水泥集料,膨胀变形主要由周期性的冻胀和盐胀,以及盐分迁移所导致;对于硫酸盐侵蚀水泥处理集料而言,膨胀主要由化学侵蚀和盐分迁移所导致。2.通过电镜扫描可以观察到,在硫酸盐侵蚀水泥处理集料过程中有大量针尖状矿物生成。

关键词组:硫酸盐侵蚀;冻融循环;膨胀;水泥处理集料;主控因素

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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