首页|TiO2光催化高延性水泥基材料拉伸性能和光催化性能研究

TiO2光催化高延性水泥基材料拉伸性能和光催化性能研究

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随着大气污染给建筑物及居住环境带来的恶劣影响日益严重,TiO2光催化水泥基材料广受关注.利用光催化剂纳米TiO2颗粒制备光催化高延性水泥基材料(PC-ECC),研究其单轴拉伸应力作用下力学性能和光催化性能;结合微观力学模型及孔结构分析纳米TiO2颗粒对PC-ECC延性的作用机理.结果表明:掺0~15%纳米TiO2颗粒的PC-ECC在龄期28 d时均具有显著的应变硬化特征和优异的多缝开裂能力,拉伸应变在掺1%纳米TiO2颗粒时出现最低值3.48%,之后升至4.55%;宏观拉伸应变随纳米TiO2颗粒掺量变化趋势与应变硬化指标J'b/Jtip一致,且后者与孔结构等微观结构紧密相关;掺5%纳米TiO2颗粒的PC-ECC经72 h紫外光照后光降解亚甲基蓝效率达95%,符合一级反应动力学模型.
Study on tensile and photocatalytic properties of TiO2 photocatalytic high ductility cement-based materials
With the increasingly severe impact of air pollution on buildings and residential environments,TiO2 photocatalytic cement-based materials have received widespread attention.Photocatalytic high ductility cement-based materials(PC-ECC)were pre-pared using TiO2 nanoparticles as photocatalysts,and their mechanical and photocatalytic properties under uniaxial tensile stress were researched.The mechanism of TiO2 nanoparticles on the ductility of PC-ECC by combining micro mechanical models and pore structure analysis was analyzed.The results showed that PC-ECC doped with 0~15%TiO2 nanoparticles exhibited significant strain hardening characteristics and excellent multi crack cracking ability at 28 days of age.The tensile strain reached its lowest value of 3.48%when doped with 1%TiO2 nanoparticles,and then increased to 4.55%.The trend of macroscopic tensile strain variation with TiO2 nanoparticle content is consistent with the strain hardening index J'b/Jtip,and the latter is closely related to mi-crostructure such as pore structure.After 72 hours of UV irradiation,the photocatalytic degradation efficiency of methylene blue in PC-ECC doped with 5%TiO2 nanoparticles reached 95%,which conforms to the first-order reaction kinetics model.

high ductility cement-based materialsTiO2tensile propertiesfiber/matrix interfacestrain hardening

徐名凤、吴国明

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建筑安全与环境国家重点实验室,北京 100013

河北工业大学土木与交通学院,天津 300401

广西金鲤水泥有限公司,广西南宁 530000

高延性水泥基材料 TiO2 拉伸性能 纤维/基质界面 应变硬化

建筑安全与环境国家重点实验室/国家建筑工程技术研究中心开放课题基金项目

BSBE2021-01

2024

新型建筑材料
中国新型建筑材料工业杭州设计研究院

新型建筑材料

CSTPCD
影响因子:0.569
ISSN:1001-702X
年,卷(期):2024.51(5)
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