CLC number:
On-line Access: 2025-01-21
Received: 2023-11-20
Revision Accepted: 2024-04-09
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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 @article{title="Expansion mechanism of sulfate attack on cement-treated aggregates under freeze–thaw cycles", %0 Journal Article TY - JOUR
冻融循环条件下硫酸盐侵蚀水泥处理集料膨胀特性研究机构: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: Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article
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