基于响应面法的水下不分散混凝土性能影响因素研究

Research on Influencing Factors of Underwater Concrete Performance Based on Response Surface Method

水下不分散混凝土因其具有良好的水下抗分散性、水下自密实等优点,能够适应特定水下部位的施工需求。为优化某水电站集运渔工程水下施工混凝土配合比,基于响应面法的试验设计,开展了絮凝剂掺量、减水剂、水泥三因素三水平配合比试验,建立了三因素与水下不分散混凝土工作性能、抗分散性能、力学性能的预测模型,分析了各因素之间的相互作用及其对目标性能的影响规律。结果表明,各因素间的交互作用中,减水剂和水泥掺量对混凝土坍落度有显著有利影响;絮凝剂和水泥掺量对混凝土溶液悬浮物含量有显著有利影响;减水剂和水泥掺量对混凝土抗压强度有显著负面影响。基于预测模型提出了混凝土配合比的优化路径,可为集运渔工程水下施工提供技术参考。

Due to its excellent anti-dispersion and self-compaction properties with water surrounding,the underwater concrete can meet the construction requirements of special underwater areas.In order to optimize the mix ratio of concrete for underwater construction of the fish collection and handling facilities in a hydropower station,a testing design is carried out with response surface method for optimizing the mixing ratio of underwater concrete.The three-elements three-levels test is done on coagulant ratio,water-reducing agent and cement dosage,and a predication model is established for assessing the workability,anti-dispersion performance and mechanical properties of underwater concrete.Meanwhile,the interactions between each two elements and the influencing rules to concrete mixing design targets are analyzed.The results show that the amount of water-reducing agent and cement dosage has a significant beneficial effect on the slump of concrete,the coagulant ratio and cement dosage has significant beneficial effect on the content of suspended matter in concrete solution,and the amount of water-reducing agent and cement content has a significant negative effect on the compressive strength of concrete.Based on the predicate model,the technical route for optimizing the mix ratio design is proposed,which can provide helpful reference for underwater construction of fish collection and handling facilities.