纳米-TiO2二氧化物对低温环境中道建设的水化过程的影响
Yongchun Jiao1, Huijian Chen1, Shengfu Xu1
1Third Engineering Bureau, China Anneng Group, Chengdu 611135, China.
Nanomaterials (Basel, Switzerland)
|January 27, 2026
概括
将纳米二氧化 (TiO2) 添加到混凝土中,通过加速强度的发展和优化孔隙结构来改善冬季建筑. 1%的纳米-TiO2剂量是最佳的增强早期的机械性能和在寒冷条件下补水.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 纳米技术 纳米技术
背景情况:
- 冬季建筑面临的挑战包括缓慢的混凝土强度增强和由于低温造成的孔隙结构差.
- 传统方法很难有效地缓解这些问题,影响项目时间表和结构完整性.
- 纳米材料为在不利条件下提高混凝土性能提供了潜在的解决方案.
研究的目的:
- 研究纳米二氧化 (TiO2) 作为水泥添加剂对低温下混凝土性能的影响.
- 确定纳米-TiO2的最佳剂量,以提高机械强度,水分和微观结构.
- 为有效的冬季混凝土建筑实践提供技术支持.
主要方法:
- 纳米TiO2在混凝土中通过1%,2%和3%的剂量通过水泥替代物被纳入.
- 使用电动液压伺服式通用测试机测量压力和分裂拉伸强度.
- 使用差异热分析 (DTA) 进行水化产品 (Ca(OH) 2) 的表征.
- 使用Micro-CT技术和毛孔网络建模量化微孔参数.
主要成果:
- 纳米TiO2缩短了初始和最终设置时间,3%的剂量将初始设置时间从5.5分钟缩短到3.3分钟.
- 1%的纳米TiO2剂量显著增强了早期 (1-3天) 的强度,使压力和分裂拉力强度分别增加了20%和26%.
- DTA证实了加速早期水泥水化,而微型CT显示在1%的剂量下降了孔隙性和改善了孔隙结构密度.
- 低温混凝土改造的最佳剂量被确定为1%的纳米-TiO2以水泥质量为单位.
结论:
- 纳米TiO2通过促进早期水合和优化混凝土的微孔结构,有效地减轻冬季建筑挑战.
- 纳米-TiO2的协同"核填充效应"在寒冷环境中增强了机械性能和结构完整性.
- 对于冬季混凝土应用,建议使用1%的水泥质量的纳米TiO2剂量.
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