影响混凝土收缩性能因素的正交实验优化设计

Factors Affecting Concrete Shrinkage Performance of Optimized Design of Orthogonal Experiment

为研究混凝土收缩性能,以单因素水平筛选实验为参考,建立L9(34)正交正交实验模型,运用SPSS 18.0软件对其结果进行差异显著性分析。结果表明,影响混凝土收缩性能的因素主次关系为:水泥用量>水灰比>龄期>含气量>粉煤灰掺量>矿渣粉掺量。混凝土收缩最佳条件为:水泥用量为400 kg/m3、水灰比为0.45、龄期为45 d、含气量为6%、粉煤灰掺量为5%、矿渣粉掺量为30%,在此条件下,混凝土的收缩量为281×10-6。通过实验,为混凝土性能的提升和改进提供一定的参考依据。

For the study of concrete shrinkage performance, taking single factor level screening experiment as reference, the L9(34) orthogonal experimental model is established, and the SPSS 18.0 software is used to analyze the significant differences in the results. The results show that the primary and secondary relationship of factors influencing the concrete shrinkage performance is cement content> water cement ratio > age > air content>fly ash contents> slag powder content. Optimal conditions for the concrete shrinkage are the cement content is 400 kg/m3, water cement ratio 0.45, age 45 d, air content 6%, fly ash contents 5%, and slag powder content 30%. Under this condition, the shrinkage of concrete is 281×10-6. The experiment can be valuable for improving the performance of concrete.