Development of General Flowing Estimation System for Fresh Concrete

选取山口县东贵拉生产的标准砂作为标定标准材料，建立了漏斗式流动试验装置的标定方法。漏斗式流动试验装置除自密实混凝土用O型、V型、S型外，还包括预应力混凝土灌浆用JP型、J_<14>型和JA型。研究结果如下：1)进行O型、V型、JP型、J_<14>型和JA型漏斗试验装置后，得到校准数据。得到了试验设备的生产、Toyoura采出标准砂的选择批次以及漏斗流动设备的类型所引起的变化。2)采用O型、V型和S型漏斗流动仪，生产了3种自密实混凝土，测量了其流动时间。采用J_<14>型、JP型和K型三种漏斗流动装置，对剔除粗集料的自密实混凝土生产的流动砂浆进行了流动时间的测定。自密实混凝土分为粉末型、粘滞剂型和组合型。3)采用细颗粒型粉煤灰与水溶性单体组合进行标定选择试验后，优选Toyoura生产的标准砂。4)通过宏观流动特性分析和微观流动特性分析，运用可视化技术，明确了物料在漏斗式流动试验装置中的流动特性。5)提出了漏斗式流动试验装置的标定方法。

Calibration method for funnel type flowing test apparatus is established after carrying out selection of standard material for calibration as standard sand produced at Toyoura in Yamaguchi Prefecture. Funnel type flowing test apparatus consists of not only O type, V type and S type for self-compacting concrete, but also JP type, J_<14> type and JA type for grout of prestressed concrete. Research results are as follows.1)Calibration data were obtained after carrying out O type, V type, JP type, J_<14> type and JA type funnel testing apparatus. Variations due to production of testing apparatus, selection lot of standard sand produced at Toyoura, and types of funnel flowing apparatus were obtained.2)Three types of self-compacting concrete were produced to measuring flowing time by the use of O type, V type and S type funnel flowing apparatus. Flowing time were measured by the use of J_<14> type, JP type and K type funnel flowing apparatus for flowing mortars which were produced from self-compacting concrete by excluded coarse aggregates. Three types of self-compacting concrete consisted of powder type, viscosity agent type and combined type.3)Standard sand produced at Toyoura is best selected after caring out calibration selection tests using combined finer particle type fly ash and water soluble monomer.4)Flowing behavior of materials in funnel type flowing test apparatus was clarified after analyzing macro type and micro type flow behavior and carrying out visualization technique.5)Calibration methods were proposed for funnel type flowing test apparatus.