Wu Dongpeng, Wang Zhicheng, Pan Yungui, Huang Jian, Fernández-Steeger Tomás Manuel, Xu Chao, Tang Xinlong, Long Zhiyu, Tang Yufei
Department of Civil Engineering, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
Institut Für Angewandte Geowissenschaften, Technische Universität Berlin, Ernst-Reuter-Platz 1, BH 3-1, 10587 Berlin, Germany.
Materials (Basel). 2023 Jul 9;16(14):4910. doi: 10.3390/ma16144910.
After high-temperature treatment, both nano-titanium dioxide-modified concrete and ordinary concrete exhibit typical splitting failure. High-temperature heating reduces the mechanical properties and brittleness of concrete and improves the ductility of concrete. The stress-strain relationship of the specimens was obtained through the uniaxial compression test of ordinary concrete and nano-titanium dioxide-modified concrete cube specimens under normal temperature and high-temperature conditions. In addition, the relationship between temperature and damage variables was established, and the unified constitutive model containing damage variables after room temperature and high-temperature treatment of ordinary concrete and nano-titanium dioxide-modified concrete were established. It provides a reference for future research on the mechanical properties of high-performance concrete structures after high temperatures (fire).
经过高温处理后，纳米二氧化钛改性混凝土和普通混凝土均呈现出典型的劈裂破坏。高温加热降低了混凝土的力学性能和脆性，提高了混凝土的延性。通过对普通混凝土和纳米二氧化钛改性混凝土立方体试件在常温及高温条件下进行单轴压缩试验，得到了试件的应力-应变关系。此外，建立了温度与损伤变量之间的关系，并建立了普通混凝土和纳米二氧化钛改性混凝土在室温及高温处理后的含损伤变量的统一本构模型。为今后高性能混凝土结构高温（火灾）后力学性能的研究提供了参考。
