Li Min, Wang Yongjun, Chen Mengzhang, Zhang Lin, Xu Yinshan, Zhao Hongbo, Ren Jiaolong
School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255000, China.
Zhejiang Scientific Research Institute of Transport, Hangzhou 310039, China.
Materials (Basel). 2024 Aug 20;17(16):4112. doi: 10.3390/ma17164112.
Ceramsite concrete is one of the most widely used lightweight concretes at present. Although mechanical properties of ceramsite concrete have been extensively discussed, its permeability characteristics are neglected in previous studies. Considering the importance of permeability resistance to concrete, the permeability grade and residual compressive strength after permeability of ceramsite concrete are analyzed in this study. The influence of ceramsite content and size on the permeability grade and residual strength of ceramsite concrete were investigated by the orthogonal experimental method. To further understand the above influence, an improved Bayesian framework for small sample data is also established to analyze the permeability grade and residual strength. Results show that the water-binder ratio and the content of 20-30 mm ceramsite aggregates are the most and least significant influencing factors affecting the permeability characteristics, respectively. The 5-10 mm and 10-20 mm ceramsite aggregates play secondary roles. Increasing 5-10 mm and 10-20 mm ceramsite aggregates is not helpful for improving the permeability resistance of ceramsite concrete. Compared with the orthogonal method, the proposed Bayesian framework is a useful tool for revealing the effects of various factors, which can cut the time cost and provide parameter visualization for the analysis process. Results show that the permeability resistance and residual strength of ceramsite concrete are improved significantly under optimal conditions. The permeability grade and residual strength are increased 200% and 80.3%, respectively. In addition, the residual strength may be more suitable for evaluating the permeability characteristics than the permeability grade.
陶粒混凝土是目前应用最为广泛的轻质混凝土之一。尽管陶粒混凝土的力学性能已得到广泛讨论，但以往研究中却忽略了其渗透特性。鉴于抗渗性对混凝土的重要性，本研究对陶粒混凝土的抗渗等级及渗透后的残余抗压强度进行了分析。采用正交试验方法研究了陶粒含量和粒径对陶粒混凝土抗渗等级及残余强度的影响。为进一步了解上述影响，还建立了一种改进的小样本数据贝叶斯框架来分析抗渗等级和残余强度。结果表明，水胶比和20 - 30mm陶粒骨料含量分别是影响渗透特性的最显著和最不显著的因素。5 - 10mm和10 - 20mm陶粒骨料起次要作用。增加5 - 10mm和10 - 20mm陶粒骨料不利于提高陶粒混凝土的抗渗性。与正交方法相比，所提出的贝叶斯框架是揭示各种因素影响的有用工具，它可以降低时间成本并为分析过程提供参数可视化。结果表明，在最佳条件下陶粒混凝土的抗渗性和残余强度显著提高。抗渗等级和残余强度分别提高了200%和80.3%。此外，残余强度可能比抗渗等级更适合用于评估渗透特性。
