砂相对密度试验方法的改进

Improvements on Method for Relative Density of Sand Experiments

改进了砂相对密度的试验方法。对最小干密度试验,改进了试验装置以简化操作手续;调整了试验步骤以减小测量误差;推荐只使用量筒倒转法测量,用量筒倾斜法整平砂面;研究了最佳取样量和量筒倒转次数。对最大干密度试验,建议采用电动相对密度仪;每层试样宜振击15 m in;推荐只使用小号的金属圆筒。

The paper introduces improvements on method for relative density of sand experiments, For the minimum dry density test of sand, test devices are improved to simplify the procedures and the test steps are adjusted to reduce the measurement error. The reverse graduated cylinder method and the tilting graduated cylinder method are recommended as the best methods for minimum dry density test and for leveling sand surface respectively. The optimum sampling quantity and the times of reversing graduated cylinder are studied. For the maximum dry density test, the use of electrically operated relative density instrument, small metal cylinder and 15 min vibration time for each layer of specimen are proposed.