Study on preparation and strengthening mechanism of new surface treatment agent of concrete at multi-scale

doi:10.1016/j.conbuildmat.2022.128404

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	Study on preparation and strengthening mechanism of new surface treatment agent of concrete at multi-scale
	Yu, Wang 2; Wenhua, Zhang 2; Peipei, Wu 2; Yilin, Pi 2; Yunsheng, Zhang 1,3
刊名	Construction and Building Materials
	2022-09-05
卷号	346
关键词	Concretes Deterioration Hydration Lithium compounds Silica Silicates Sodium compounds Sols Surface treatment C-S-H gel Concrete surface Hydration products Multi-scales Nano Silica Pores structure Pozzolanic reaction Preparation mechanisms Strengthening mechanisms Surface treatment agents
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2022.128404
英文摘要	Concrete is susceptible to external erosion during service, the life of which was thus shortened due to the deterioration from the surface to the inside. In this study, the concrete surface treatment agent at multi-scale was innovatively proposed, which compounded of nano-silica sol–gel, micron-scale lithium silicate and sodium silicate. The physical properties and mechanical properties were investigated. Moreover, the mechanism of the new surface treatment agent was revealed in terms of pore structure and hydration products by XRD, TG, NMR, iMicro, and SEM. The results show that the Mohs hardness, flexural strength, and hydration degree are increased (by 260%, 78.7%, 12.1%), and porosity is reduced by 22% after the surface treatment. The mechanism is that pores can be repaired by particles of multi-scale. In addition, pretreatment of Ca2+ can further promote the pozzolanic reaction. The extra of EDTA-2Na can promote not only the pozzolanic reaction but also secondary hydration reaction. © 2022
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159414]
专题	兰州理工大学
作者单位	1.Department of Materials Science and Engineering, Southeast University, Jiangsu Key Laboratory of Construction Materials, Nanjing; 211189, China; 2.Department of Civil Engineering, Nanjing Forestry University, Nanjing; 210037, China; 3.College of Civil Engineering, Lanzhou University of Technology, Gansu Province, 730050, China
推荐引用方式 GB/T 7714	Yu, Wang,Wenhua, Zhang,Peipei, Wu,et al. Study on preparation and strengthening mechanism of new surface treatment agent of concrete at multi-scale[J]. Construction and Building Materials,2022,346.
APA	Yu, Wang,Wenhua, Zhang,Peipei, Wu,Yilin, Pi,&Yunsheng, Zhang.(2022).Study on preparation and strengthening mechanism of new surface treatment agent of concrete at multi-scale.Construction and Building Materials,346.
MLA	Yu, Wang,et al."Study on preparation and strengthening mechanism of new surface treatment agent of concrete at multi-scale".Construction and Building Materials 346(2022).