You Quan, Miao Linchang, Li Chao, Fang Huanglei, Liang Xiaodong
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China.
Materials (Basel). 2019 Sep 6;12(18):2882. doi: 10.3390/ma12182882.
The fatigue and durability characteristics of structural expanded polystyrene concrete (EPS) are especially important when it was applied for structural elements in long-term service. In order to study the fatigue and durability behavior of structural EPS concrete, the long-term cyclic loading experiments and wetting-drying (W-D) cyclic experiments were conducted, respectively. The structural EPS concrete was found to have a relatively large damping and a fairly low dynamic elastic modulus under long-term cyclic load, which illustrated that it had a better energy absorption effect and toughness than plain concrete of the same strength level. Even if fine cracks appeared during the cyclic loading process, the relevant dynamic performance remained stable, which indicated that the structural EPS concrete had superior fatigue stability. In W-D cyclic experiments, the structural EPS concrete exhibited superior sulfate resistance. During the erosion test process, there was a positive correlation between the mass change and the evolution of the compressive strength of the structural EPS concrete, which indicated that Δm could be substituted for Δf to evaluate the degree of the structural EPS concrete eroded by sulfate attack. The study focuses on the fatigue performance and sulfate resistance of structural EPS concrete and is of important engineering value for promoting practical long-term operations.
结构发泡聚苯乙烯混凝土（EPS）在长期服役用于结构构件时，其疲劳和耐久性特性尤为重要。为研究结构EPS混凝土的疲劳和耐久性能，分别进行了长期循环加载试验和干湿循环试验。结果发现，结构EPS混凝土在长期循环荷载作用下具有较大的阻尼和较低的动弹性模量，这表明它比相同强度等级的普通混凝土具有更好的能量吸收效果和韧性。即使在循环加载过程中出现细裂缝，其相关动力性能仍保持稳定，这说明结构EPS混凝土具有优异的疲劳稳定性。在干湿循环试验中，结构EPS混凝土表现出优异的抗硫酸盐性能。在侵蚀试验过程中，结构EPS混凝土的质量变化与抗压强度演变之间存在正相关关系，这表明可用Δm代替Δf来评估结构EPS混凝土遭受硫酸盐侵蚀的程度。该研究聚焦于结构EPS混凝土的疲劳性能和抗硫酸盐性能，对推动实际长期工程应用具有重要的工程价值。
