Cao Yue, Kong Zheng, Zheng Yadong, Xu Zhijun, Tai Lianhai, Li Chong, Wu Peng
School of Mining Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
School of Physics and New Energy, Xuzhou University of Technology, Xuzhou, 221018, China.
Sci Rep. 2025 Jul 2;15(1):22975. doi: 10.1038/s41598-025-07304-y.
To investigate the mechanical properties of concrete-foamed cement composite specimens (C-FCCS), uniaxial compression tests were conducted on composite specimens with varying proportions and strengths of foamed cement. The analysis focused on the peak compressive strength, peak strain, macroscopic failure morphology, and acoustic emission (AE) characteristics of C-FCCS. The experimental results indicate that the peak compressive strength of C-FCCS exhibits a negative correlation with the proportion of foamed cement and a positive correlation with the proportion of concrete. At foamed cement proportions of 10% and 20%, the peak compressive strength of C-FCCS is predominantly governed by concrete, with AE energy concentrated primarily during the initial loading phase and near the peak stress. In contrast, at foamed cement proportions ranging from 30 to 50%, the peak compressive strength is dominated by foamed cement, with AE energy concentrated around the peak stress. The peak strain of C-FCCS shows a trend of initially increasing and then decreasing with the increase in height ratio (Height ratio = Foamed cement height/C-FCCS height). Under different height ratios, the peak strain of C-FCCS is approximately 175.61-558.13% of that of pure concrete specimens. Furthermore, variations in the strength of foamed cement have a minimal impact on the peak compressive strength of C-FCCS but significantly affect the peak strain. The peak compressive strength of C-FCCS is about 77.67-83.87% of that of pure concrete specimens, while the peak strain ranges from 128.46 to 361.38%. Lastly, the macroscopic failure of C-FCCS is primarily characterized by tensile failure, with shear failure commonly observed at the edges and corner interfaces of C-FCCS.
为研究混凝土-泡沫水泥复合材料试件（C-FCCS）的力学性能，对不同比例和强度的泡沫水泥复合材料试件进行了单轴压缩试验。分析重点为C-FCCS的峰值抗压强度、峰值应变、宏观破坏形态和声发射（AE）特性。试验结果表明，C-FCCS的峰值抗压强度与泡沫水泥比例呈负相关，与混凝土比例呈正相关。当泡沫水泥比例为10%和20%时，C-FCCS的峰值抗压强度主要由混凝土控制，声发射能量主要集中在初始加载阶段和接近峰值应力时。相比之下，当泡沫水泥比例在30%至50%之间时，峰值抗压强度由泡沫水泥主导，声发射能量集中在峰值应力附近。C-FCCS的峰值应变随高度比（高度比=泡沫水泥高度/C-FCCS高度）的增加呈现先增大后减小的趋势。在不同高度比下，C-FCCS的峰值应变约为纯混凝土试件峰值应变的175.61-558.13%。此外，泡沫水泥强度的变化对C-FCCS的峰值抗压强度影响极小，但对峰值应变有显著影响。C-FCCS的峰值抗压强度约为纯混凝土试件峰值抗压强度的77.67-83.87%，而峰值应变范围为128.46至361.38%。最后，C-FCCS的宏观破坏主要以拉伸破坏为特征，在C-FCCS的边缘和角部界面处常见剪切破坏。
