基于微型圆柱塌落度筒的膏体流动性测试与屈服应力分析

Fluidity Test and Yield Stress Analysis of Paste Based on Micro Cylindrical Slump Cylinder

塌落度是反映充填料浆流动性的重要指标,采用ASTM标准塌落度筒测试塌落度时尾砂用量较大,试验操作不够灵活,因此,研究开发了一种适用于膏体充填的微型圆柱塌落度筒,通过塌落度测试对比分析,给出了微型圆柱塌落度筒的高径比,建立了塌落度-屈服应力之间的关系模型,且用微型圆柱塌落度筒测试得到的塌落度通过数学模型计算屈服应力与流变仪测量所得屈服应力吻合。通过线性回归精度比较和误差分析,最终选出高100 mm、直径67 mm(高径比1.5∶1)的0.352 L圆柱形塌落度筒替代ASTM标准塌落度筒进行膏体流动性测试,工业试验结果表明,微型圆柱塌落度筒测试结果能更好反映膏体的流动性能。

Slump is an important fluidity index of paste filling slurry. When the ASTM standard slump cylinder was used to test slump, the amount of tailings was large, and the test operation was not flexible enough. Therefore, a micro cylindrical slump cylinder suitable for paste filling was developed. Through the comparative analysis of slump test, the height-diameter ratio of micro cylindrical slump cylinder was given, and the relationship model between slump and yield stress was established. Through calculating the slump obtained from micro cylindrical slump cylinder, the yield stress obtained by the mathematical model is consistent with the yield stress measured by rheometer. Through linear regression precision comparison and error analysis, a 0.352 L cylindrical slump cylinder with a height of 100 mm and a diameter of 67 mm(height-diameter ratio of 1.5∶1) was finally selected to replace the ASTM standard slump cylinder for paste fluidity test. The industrial test results show that test results of micro cylindrical slump cylinder can better reflect the fluidity of paste.