VALIDATION OF NUCLEAR GAUGE DENSITY-METER READINGS AGAINST SAND REPLACEMENT METHOD

This paper presents wet density and moisture content comparative test results of surface nuclear gauge density-meter against sand replacement method. The test results were obtained by carrying out field density parallel testing, whereby the density and moisture readings were determined first using a nuclear gauge density-meter followed by the sand replacement method. The use of “multiple shift coefficients” developed from a linear regression model as a means of adjusting and calibrating the nuclear gauge density-meter readings against sand replacement test results is proposed本文呈现了表面式核子密度仪（surface nuclear gauge density-meter）与灌砂法（sand replacement method）的湿密度及含水率对比试验结果。该试验结果通过现场密度平行试验获取，其试验流程为先采用核子密度仪测定密度与含水率读数，随后采用灌砂法完成测定。本文提出采用基于线性回归模型（linear regression model）构建的“多偏移系数”，作为针对灌砂法试验结果对核子密度仪读数进行校正与标定的手段。