Development of General Flowing Estimation System for Fresh Concrete

通过对山口县Toyoua生产的标准砂进行校准标准物质的选择，建立了漏斗式流动测试仪的校准方法。漏斗流动仪不仅有O型、V型、S型自密实混凝土流动仪，还有JP型、J14型、JA型预应力混凝土灌浆流动仪。研究结果如下：1)对O型、V型、JP型、J&lt；14&gt；型和JA型漏斗测试仪进行了标定，得到了标定数据。2)利用O型、V型和S漏斗流动仪生产了三种不同型号的自密实混凝土进行流态时间的测定。采用J&lt；14型、JP型和K型漏斗流动仪对不含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、粘性剂型和混合型三种类型。3)在进行组合细粒型飞灰和水溶性单体的标定筛选试验后，优选出东友公司生产的标准砂。4)在分析宏观和微观流动行为并进行可视化技术的基础上，阐明了材料在漏斗式流动试验仪中的流动行为。5)提出了漏斗式流动试验仪的标定方法。

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.