基于试验验证的HPC配合比设计全计算改进方法

Improving overall calculation design approach for high-performance concrete using experimental verification

采用经验方法对高性能混凝土的配合比进行设计,难以保证混凝土性能满足不同工程需求。提出一种高性能混凝土配合比设计的全计算改进方法,在充分分析全计算设计法中影响因子对混凝土性能影响的前提下,实现针对低温等特殊环境下高性能混凝土制备的性能控制。综合分析配合比设计计算方法中包含的影响因子,挑选混凝土成分比例以及添加剂相关的6个影响因子,考虑混凝土坍落度、强度、单位立方米造价等3方面性能,进行正交试验,量化各影响因子对混凝土性能的影响规律。依据选择的敏感参数及取值,进行高性能混凝土的匀质试验,验证所提配合比设计方法的可用性。结果表明:水灰比是影响混凝土强度的重要因子,而减水剂掺量是混凝土坍落度的关键影响因子。

The empirical design method for high-performance concrete(HPC)is hard to meet various engineering demands of concrete performance.It proposes an overall calculation approach for HPC mix design to realize the HPC application in a low-temperature environment before determining effects on HPC performance of various parameters using in overall calculation approach.A series of influencing factors of concrete design is comparison analyzed.Six parameters associated with the concrete proportion and additives are selected to design an orthogonal experiment considering multi-performance goals like concrete slump,concrete strength,and unit cost.The effect of six parameters on concrete performance is analyzed based on the test data and the most sensitive parameters are identified.An HPC homogeneous experiment is conducted to verify the HPC mix design method proposed.The results show that the water-cement ratio is the most important factor influencing the strength of concrete.The water-reducing agent admixture is the key influencing factor for the concrete slump.