Study on Freeze-Thaw Damage of Nano-Modified Concrete Under Complex Environmental Factors
LIU Fang1,2, ZHANG Kunkun1,2, LUO Tao1,2, MA Weiwei1,2, JIANG Wei1,2
1 School of Civil Engineering, Xijing University, Xi'an 710123, China 2 Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xi'an 710123, China
Abstract: In order to study the influence of nano-materials on durability and deterioration of concrete under complex environment, nano-modified concrete with different types (SiO2 and TiO2), different particle sizes (15 nm and 30 nm) and different dosage(0.2%,0.4%,0.6%,0.8%) suffered sulfate attack (3 d), carbonation (3 d) and freeze-thaw cycles (25 times, 50 times, 75 times) in turn. The mass loss and relative dynamic elastic modulus of concrete samples were measured. The pore structure evolution was monitored by industrial CT (computer tomography). The results show that the durability of nano-modified concrete with particle size of 15 nm is better than that with particle size of 30 nm in general. Compared with nano-TiO2, the improvement of nano-SiO2 modified concrete is better. The damage of 15 nm-SiO2 concrete with 0.6% content is less, which can improve the internal structure of concrete better. During the process of sulfate attack, carbonation and freeze-thaw cycles, the porosity of 15 nm-nano-SiO2, 30 nm-nano-SiO2 and 30 nm-nano-TiO2 modified concrete generally decreases firstly and then increases. With the increase of freeze-thaw cycles, the pore structure evolution of all nano-particles modified concrete samples have the same regulation. The volume proportion of pores (≤0.01 mm3) decreases monotonously, while the volume proportion of pores (＞10 mm3) increases generally.
作者简介: 刘方,西京学院副教授,硕士研究生导师。博士毕业于哈尔滨工程大学固体力学专业。2012年参与国家公派留学博士联合培养项目(The University of Sydney)。目前主要研究方向为水泥基复合材料耐久性及机理分析,已公开发表学术论文近20篇,其中SCI论文8篇。目前主持国家自然科学基金、国家级重点实验室开放基金、陕西省教育厅专项科研项目、西京学院高层次人才科研启动基金项目等。 罗滔,副教授,硕士研究生导师。2016年12月博士毕业于武汉大学岩土工程专业,曾于2014年7月至2016年6月获CSC资助在澳大利亚联邦大学联合培养两年,陕西高校第四批“青年杰出人才支持计划”人选。现任陕西省混凝土结构安全与耐久性重点实验室常务副主任,陕西高校青年创新团队负责人。主要从事西部寒区水工结构安全与耐久性方面的研究,已在国内外期刊发表学术论文30余篇,其中第一作者SCI/EI检索源刊论文6篇,主持国家自然科学基金青年项目、陕西省自然科学基础研究计划青年项目、陕西省教育厅专项科研计划项目等。
引用本文:
刘方, 张昆昆, 罗滔, 马卫卫, 蒋伟. 复杂环境因素下纳米改性混凝土冻融损伤研究[J]. 材料导报, 2022, 36(8): 20100024-5.
LIU Fang, ZHANG Kunkun, LUO Tao, MA Weiwei, JIANG Wei. Study on Freeze-Thaw Damage of Nano-Modified Concrete Under Complex Environmental Factors. Materials Reports, 2022, 36(8): 20100024-5.
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2022, Vol. 36 
