Wang Shuyong, Chen Guoxin, Zhang Lingkai
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China; College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China.
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China; College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China.
J Hazard Mater. 2022 Feb 15;424(Pt A):127402. doi: 10.1016/j.jhazmat.2021.127402. Epub 2021 Oct 1.
The macro- and micro-physical properties of cement-stabilized steel slag (CSS) base materials in a highway project were studied. A discrete element model of CSS with a real steel slag shape was constructed using Particle Flow Code 3D and 3D scanning technology. The sensitivity between the macro- and micro-parameters of the sample was explored, and a nonlinear regression equation was established to analyze the relationship between these parameters. Uniaxial compression simulation tests were conducted on CSS with steel slag contents of 0%, 10%, 30%, and 50%. By combining contact calculation, crack location, energy tracking, acoustic emission (AE) monitoring, and other program systems, the macro- and micro-mechanical properties and micro-crack evolution law of the samples in the failure process were analyzed in terms of strength, energy, and fracture damage. The damage mechanism of CSS was also revealed. Results showed that with the increase in steel slag content, the elastic modulus and peak stress of the samples increased, the Poisson's ratio decreased, and the post-peak stress curve steepened, indicating obvious brittle failure characteristics. With the increase in steel slag content, the crack initiation stress, thickness of the fracture surface, and number of internal micro-cracks in CSS increased exponentially. In the uniaxial compression test, AE intensity underwent five stages, in which the peak moment of AE intensity exhibited hysteresis compared with the moment of the peak stress. Absorption and release phenomena of strain energy were observed in the process of specimen failure. When the steel slag content increased, the total strain energy absorbed by the specimen increased. When the absorbed energy exceeded the bond strength, the bond ruptured with the release of energy. The main crack of the sample penetrated and stretched to the direction of strain energy release to form a macroscopic fracture surface.
对某公路工程中水泥稳定钢渣（CSS）基层材料的宏观和微观物理性质进行了研究。利用颗粒流代码3D和3D扫描技术构建了具有真实钢渣形状的CSS离散元模型。探究了样品宏观参数与微观参数之间的敏感性，并建立了非线性回归方程来分析这些参数之间的关系。对钢渣含量分别为0%、10%、30%和50%的CSS进行了单轴压缩模拟试验。通过结合接触计算、裂纹定位、能量跟踪、声发射（AE）监测等程序系统，从强度、能量和断裂损伤等方面分析了样品在破坏过程中的宏观和微观力学性质以及微裂纹演化规律。还揭示了CSS的损伤机制。结果表明，随着钢渣含量的增加，样品的弹性模量和峰值应力增大，泊松比减小，峰值后应力曲线变陡，呈现出明显的脆性破坏特征。随着钢渣含量的增加，CSS的裂纹起裂应力、断裂面厚度和内部微裂纹数量呈指数增加。在单轴压缩试验中，AE强度经历了五个阶段，其中AE强度峰值时刻相对于峰值应力时刻表现出滞后性。在试样破坏过程中观察到应变能的吸收和释放现象。当钢渣含量增加时，试样吸收的总应变能增加。当吸收的能量超过粘结强度时，粘结发生破裂并释放能量。样品的主裂纹沿应变能释放方向贯穿并扩展，形成宏观断裂面。
