TiO2改性钢渣基透水混凝土的力学和NOx降解性能研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 191-199.

TiO₂改性钢渣基透水混凝土的力学和NO_x降解性能研究

林元明¹, 林佳福², 熊晓立², 杨政险²

1.福州第七建筑工程有限公司,福州 350013;
2.福州大学土木工程学院,福州 350108

收稿日期:2023-08-10 修订日期:2023-10-20 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 杨政险,博士,教授。E-mail:zxyang@fzu.edu.cn
作者简介:林元明(1970—),男,高级工程师。主要从事高性能混凝土力学性能及结构加固、工程管理等方面的研究。E-mail:fzqjlym@163.com
基金资助:
国家自然科学基金(51978171);福州市科技局科技创新平台项目(2021-P-031);校企合作项目(新型低碳环保光催化混凝土材料的研发及应用)

Mechanical and NO_x Degradation Performance of TiO₂ Modified Steel Slag-Based Permeable Concrete

LIN Yuanming¹, LIN Jiafu², XIONG Xiaoli², YANG Zhengxian²

1. Fuzhou Seventh Construction Engineering Co., Ltd., Fuzhou 350013, China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China

Received:2023-08-10 Revised:2023-10-20 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

摘要： 以内掺纳米TiO₂为光催化剂,钢渣和矿渣粉为胶材,大钢渣颗粒为骨料,制备了TiO₂改性钢渣基透水混凝土(TSSPC),并研究了TiO₂掺量对TSSPC的抗压强度、透水性能和NO_x降解性能的影响。此外,结合XRD和SEM-EDX等微观测试分析方法,阐明了TiO₂对TSSPC力学性能、透水性能和光催化性能的影响机理,为TiO₂在透水混凝土中的应用奠定了基础。结果表明,当TiO₂掺量较少时,TiO₂颗粒的“晶核效应”对胶凝材料的早期水化有促进作用。但当TiO₂掺量较多时,TiO₂颗粒易发生团聚,不利于TSSPC的力学性能发展。此外,随着TiO₂掺量的提高,透水混凝土的连通孔隙率和透水系数均上升。相较于空白对照组,TiO₂掺量为5%(质量分数,下同)的TSSPC的连通孔隙率和透水系数分别提高了4.5个百分点和1.34 mm·s^-1。TSSPC对NO_x的降解效率随着TiO₂掺量(0%～5%)的增加而提高,当TiO₂掺量超过3%时,继续增加TiO₂掺量对NO_x降解效率的提升效果显著下降。

关键词: 钢渣, 透水混凝土, TiO₂, 力学性能, NO_x降解

Abstract: TiO₂ modified steel slag-based permeable concrete (TSSPC) was prepared with nano-TiO₂ incorporated as photocatalyst, steel slag and slag powder as binder, and large steel slag particle as aggregate. The effects of TiO₂ content on the compressive strength, water permeability and NO_x degradation performance of TSSPC were studied. In addition, combined with microscopic test and analysis methods such as XRD and SEM-EDX, the effect mechanism of TiO₂ on the mechanical properties, water permeability and photocatalytic performance of TSSPC was investigated, laying the foundation for the application of TiO₂ in permeable concrete. The results show that when the TiO₂ content is low, the “nucleation effect” of TiO₂ particles promotes the early hydration of binder materials. However, when TiO₂ content is high, TiO₂ particles tend to agglomerate, which is harmful to the mechanical properties of TSSPC. In addition, as the TiO₂ content increases, the connected porosity and water permeability coefficient of permeable concrete increase. Compared with the blank control group, the connected porosity and water permeability coefficient of TSSPC with a TiO₂ content of 5% (mass fraction, the same below) increase by 4.5 percentage points and 1.34 mm·s^-1, respectively. The NO_x degradation efficiency of TSSPC increases as the TiO₂ content (0%～5%) increases. However, due to the agglomeration phenomenon, when the TiO₂ content exceeds 3%, the effect of increasing the TiO₂ content on NO_x degradation efficiency decreases significantly.

Key words: steel slag, permeable concrete, TiO₂, mechanical property, NO_x degradation

中图分类号:

TU528

林元明, 林佳福, 熊晓立, 杨政险. TiO₂改性钢渣基透水混凝土的力学和NO_x降解性能研究[J]. 硅酸盐通报, 2024, 43(1): 191-199.

LIN Yuanming, LIN Jiafu, XIONG Xiaoli, YANG Zhengxian. Mechanical and NO_x Degradation Performance of TiO₂ Modified Steel Slag-Based Permeable Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 191-199.

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TiO₂改性钢渣基透水混凝土的力学和NO_x降解性能研究

Mechanical and NO_x Degradation Performance of TiO₂ Modified Steel Slag-Based Permeable Concrete

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