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Mechanical Properties under Compression and Microscopy Analysis of Basalt Fiber Reinforced Recycled Aggregate Concrete
Materials ( IF 3.4 ) Pub Date : 2023-03-22 , DOI: 10.3390/ma16062520
Xianggang Zhang 1, 2 , Gaoqiang Zhou 2 , Ping Xu 2 , Lei Fu 3 , Dapeng Deng 2 , Xiaomei Kuang 2 , Yuhui Fan 2
Affiliation  

In this study, the basalt fiber content (0%, 0.075%, and 0.15%) and replacement ratio of recycled coarse aggregate (0%, 50%, and 100%) were used as parameters, and the compressive strength of 15 cubes and 15 prisms was analyzed. The failure morphology of the specimens was characterized, and the cubic compressive strength, axial compressive strength, elastic modulus, Poisson’s ratio, and other mechanical property indices of the specimens were measured. Upon increasing the replacement ratio, the degree of damage of the specimens gradually increased, whereas the cubic compressive strength, axial compressive strength, and elastic modulus gradually decreased. As the replacement ratio was increased from 50% to 100%, the cubic compressive strength and elastic modulus were noted to decrease the most by about 9.07% and 9.87%, respectively. On the other hand, the Poisson’s ratio first decreased, followed by an increase. Upon increasing the fiber content, the degree of damage of the specimens was gradually reduced, whereas the cubic compressive strength, axial compressive strength, and elastic modulus gradually increased. As the fiber content increased from 0.075% to 0.15%, the axial compressive strength and elastic modulus increased the most by about 6.65% and 10.19%, respectively. On the other hand, the Poisson’s ratio gradually decreased. Based on the test data, the functional relationships between the strength indices and different variables, as well as the conversion value of each strength index and different variables were established; after comparison and verification, the formula calculation results were found to be in good agreement with the test results. The microstructural changes in the basalt fiber reinforced recycled aggregate concrete were characterized by scanning electron microscopy (SEM), and the changes in the mechanical properties of the basalt fiber reinforced recycled aggregate concrete as well as the mechanism of fiber modification and reinforcement were explained from a micro perspective.

中文翻译:

玄武岩纤维再生骨料混凝土受压力学性能及显微分析

本研究以玄武岩纤维含量(0%、0.075%、0.15%)和再生粗骨料替代率(0%、50%、100%)为参数,计算了15个立方体和分析了 15 个棱镜。表征了试件的破坏形貌,测量了试件的立方体抗压强度、轴向抗压强度、弹性模量、泊松比等力学性能指标。随着置换率的增加,试件的破坏程度逐渐增加,而立方抗压强度、轴向抗压强度和弹性模量逐渐降低。随着置换率从 50% 增加到 100%,立方体抗压强度和弹性模量下降最多,分别约为 9.07% 和 9.87%。另一方面,泊松比先下降后上升。随着纤维含量的增加,试件的破坏程度逐渐减小,而立方抗压强度、轴向抗压强度和弹性模量逐渐增加。随着纤维含量从0.075%增加到0.15%,轴向抗压强度和弹性模量增加最多,分别约为6.65%和10.19%。另一方面,泊松比逐渐下降。以试验数据为基础,建立强度指标与不同变量之间的函数关系,以及各强度指标与不同变量的换算值;经对比验证,公式计算结果与试验结果吻合较好。
更新日期:2023-03-22
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