He Jingjing, Huang Zhibin, Wang Xuezhi, Xin Ming, Zhang Yong, Lu Haodan
Power China Northwest Engineering Corporation Limited, Xi'an 710065, China.
School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, China.
Materials (Basel). 2024 Sep 19;17(18):4596. doi: 10.3390/ma17184596.
In recent years, high-ductility concrete (HDC) has gradually become popular in the construction industry because of its excellent ductility and crack resistance. Concrete itself is a kind of building material with poor tensile properties, and it is necessary to add a large number of steel bars to improve its tensile properties, which increases the construction cost of buildings. However, most of the research studies on high-ductility concrete are scattered. In this paper, the basic mechanical properties of high-ductility concrete and the effects of dry and wet cycles, freeze-thaw cycles, and salt erosion on the durability of high-ductility concrete are obtained by comprehensive analysis. The results show that the tensile properties of HDC can be significantly improved by adding appropriate fiber. When the volume fraction of steel fiber is 2.0%, the splitting tensile strength of concrete is increased by 98.3%. The crack width threshold of concrete chloride erosion is 55-80 μm, and when the crack width threshold is exceeded, the diffusion of CL-1 will be accelerated, and the HDC can control the crack within the threshold, thereby improving the durability of the concrete. Finally, the current research status of high-ductility concrete is analyzed, and the future development of high-ductility concrete is proposed.
近年来，高延性混凝土（HDC）因其优异的延性和抗裂性在建筑行业逐渐受到青睐。混凝土本身是一种抗拉性能较差的建筑材料，需要添加大量钢筋来提高其抗拉性能，这增加了建筑物的建造成本。然而，目前关于高延性混凝土的研究大多较为分散。本文通过综合分析得出了高延性混凝土的基本力学性能以及干湿循环、冻融循环和盐侵蚀对高延性混凝土耐久性的影响。结果表明，添加适量纤维可显著提高HDC的抗拉性能。当钢纤维体积分数为2.0%时，混凝土的劈裂抗拉强度提高了98.3%。混凝土氯离子侵蚀的裂缝宽度阈值为55 - 80μm，超过该阈值时，CL-1的扩散会加速，而HDC能将裂缝控制在阈值范围内，从而提高混凝土的耐久性。最后，分析了高延性混凝土的研究现状，并对其未来发展提出了建议。
