响应面法在3D打印混凝土配合比设计中的应用

Application of Response Surface Method in 3D Printing Concrete Mix Proportion Design

使用Design-Expert进行Box.Behnken Design试验设计。利用“响应面分析法”研究水胶比、粉煤灰掺量和减水剂掺量对3D打印混凝土的流动性和抗压强度影响,建立了高拟合度的影响因素模型,通过设置流动度和抗压强度响应值,优化了3D打印混凝土中水胶比(0.26)、粉煤灰掺量(20.0%)和减水剂掺量(1.0%),并进行配合比验证试验。试验结果表明,利用“响应面分析法”"进行3D打印混凝土配合比优化是可行且高效的。

Using Design-Expert to carry out the experimental design of Box.Behnken Design.The"response surface analysis method"was used to study the influence of water-binder ratio,fly ash content and water reducing agent content on the fluidity and compressive strength of 3D printing concrete,and established a high-fit factor model.The water-binder ratio(0.26),the content of fly ash(20.0%)and the content of water reducer(1.0%)in the 3D printing concrete were optimized according to the response values of fluidity and compressive strength,and the mixing ratio verification test was carried out.The experimental results show that it is feasible and efficient to use the"response surface analysis method"to optimize the mix ratio of 3D printing concrete.