Box-Behnken响应面实验优化掺玄武岩纤维再生骨料混凝土性能研究

Box-Behnken response surface experiment optimizes performance of basalt fiber-doped recycled aggregate concrete

为应对我国天然砂石资源枯竭与生态保护的需求,以及扩大再生骨料混凝土在市政工程领域的应用,试验使用Box-Behnken响应面实验优化掺玄武岩纤维再生骨料混凝土性能,选择混凝土水灰比、粉煤灰掺量与玄武岩纤维掺量为影响因子,综合考虑混凝土工作性能与力学性能。提出的二次项函数可以较好地拟合试验值。根据模型得到最优配合比为混凝土的水灰比为0.396、粉煤灰掺量为13.5%、玄武岩纤维0.75vol.%,模拟值与试验值间拟合度高。

In order to meet the needs of depletion of natural sand and gravel resources and ecological protection in China,as well as to expand the application of recycled aggregate concrete in the field of municipal engineer-ing,the Box-Behnken response surface experiment was used to optimize the performance of basalt fiber recy-cled aggregate concrete,and the concrete water-cement ratio,fly ash content and basalt fiber content were se-lected as influencing factors,and the concrete workability and mechanical properties were comprehensively considered.The proposed quadratic term function can fit the experimental values well.According to the model,the optimal mix ratio is 0.396 for concrete,13.5%for fly ash and 0.75 vol.%for basalt fiber,and the fit be-tween the simulated and experimental values is high.