IODP Expedition 327 Moisture and Density

Moisture and density (MAD) data were acquired on ~10 mL sediment or rock samples by measuring three out of four material parameters: wet (saturated) mass, wet volume, dry mass, and/or dry volume after 24 h drying in a convection oven at 105 degrees C. From the moisture and volume measurements, the following phase relationships are calculated: wet and dry water content, wet bulk density, dry bulk density, grain density, porosity, and void ratio. The combination of measurements is defined by the submethod chosen: A, B, C, or D. Wet (A, B, or C) and dry (A, B, C, or D) mass is determined using motion-compensated balances. Wet volume is determined either by helium pycnometry (A) or by the sample's geometric dimensions using calipers (A or D). Dry volume (C or D) is measured by helium pycnometry. Submethods A and B are not recommended by IODP. Submethod C is suitable for saturated materials such as fine-grained sediments. Submethod D is suitable for unsaturated porous material such as certain limestones and basalts.含水率与密度（MAD）数据集通过对约10毫升沉积物或岩石样品进行测试获得：将样品置于105℃对流烘箱中干燥24小时后，测量四项物性参数中的三项——湿（饱和）质量、湿体积、干质量及/或干体积。基于含水率与体积测量数据，可计算得到以下三相关系参数：湿基含水率、干基含水率、湿容重、干容重、颗粒密度、孔隙度及孔隙比。测量组合方式由所选子方法（A、B、C或D）确定。适用于子方法A、B或C的湿质量，以及适用于子方法A、B、C或D的干质量，均采用运动补偿天平进行测定。湿体积的测定可采用两种方式：氦比重瓶法（对应子方法A），或通过游标卡尺测量样品几何尺寸（对应子方法A或D）。干体积（对应子方法C或D）采用氦比重瓶法测定。国际大洋发现计划（International Ocean Discovery Program，IODP）不推荐使用子方法A与B。子方法C适用于细粒沉积物等饱和多孔材料。子方法D适用于特定灰岩、玄武岩等非饱和多孔介质材料。