Li Weichao, Li Laibo, Li Yali, Li Yanlin, Lu Lingchao, Cheng Xin
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China.
Centre for Smart Infrastructure and Digital Construction, School of Engineering, Swinburne University of Technology, Hawthorn, Melbourne, VIC 3122, Australia.
Materials (Basel). 2022 Dec 19;15(24):9065. doi: 10.3390/ma15249065.
Many places in the world suffer from a shortage of river sand because of population growth and environmental protection, and people have to replace river sand with manufactured sand (M-sand). In this study, M-sand was adopted as aggregate and the effect of the mix design (paste fluidity (PF) and paste-to-aggregate ratio (P/A)) on the properties of porous mortar was investigated through a combined experimental, statistical and response surface method (RSM). By including variations in both P/A (0.16-0.26) and PF (160-200 mm), the method was utilized to develop ANOVA models and construct response surface and contour lines. The experimental results revealed that the compressive strength of the porous mortar increased by 62.3% to a value of 34.1 MPa while the PF increased to 190 mm from 160 mm at a P/A of 0.20, and the water permeability coefficient was 7.2 mm/s under the same conditions. In addition, the ANOVA analysis of the measured properties revealed a strong interactive effect of the paste-to-aggregate ratio and paste fluidity on the porous mortar properties, and the developed relationship models between the variables and responses were accurate. A porous mortar with a compressive strength over 30 MPa and a permeability coefficient over 7 mm/s could be conveniently designed by RSM. Additionally, the compressive strength of the porous concrete reached more than 40 MPa at a P/A of 0.26.
由于人口增长和环境保护，世界上许多地方都面临河砂短缺的问题，人们不得不使用机制砂（M砂）来替代河砂。在本研究中，采用M砂作为骨料，并通过实验、统计和响应面法（RSM）相结合的方式，研究了配合比设计（浆体流动性（PF）和浆体与骨料比（P/A））对多孔砂浆性能的影响。通过纳入P/A（0.16 - 0.26）和PF（160 - 200毫米）的变化，该方法用于建立方差分析模型，并构建响应面和等高线。实验结果表明，当P/A为0.20时，随着PF从160毫米增加到190毫米，多孔砂浆的抗压强度提高了62.3%，达到34.1兆帕，且在相同条件下的透水系数为7.2毫米/秒。此外，对测量性能的方差分析表明，浆体与骨料比和浆体流动性对多孔砂浆性能有很强的交互作用，并且所建立的变量与响应之间的关系模型是准确的。通过响应面法可以方便地设计出抗压强度超过30兆帕、渗透系数超过7毫米/秒的多孔砂浆。此外，当P/A为0.26时，多孔混凝土的抗压强度达到40兆帕以上。
