AASHTO T89 土的液限值测试方法.pdf

EMBANKMENT AND BASE WAQTC AASHTO T 89 IN-PLACE DENSITY DETERMINING THE LIQUID LIMIT OF SOILS FOP FOR AASHTO T 89 (07) Scope This procedure covers the determination of the liquid limit of a soil in accordance with AASHTO T 89. It is used in conjunction with the FOP for AASHTO T 90, Determining the Plastic Limit and Plasticity Index of Soils. The three values are used for soil classification and other purposes. Apparatus • Dish: preferably unglazed porcelain or similar mixing dish, about 115 mm (4.5 in.) in diameter. • Spatula: having a blade 75 to 100 mm (3 to 4 in.) long and about 20 mm (3/4 in.) wide. • Liquid Limit Device: manually or mechanically operated, consisting of a brass cup, carriage, and base plate. • Grooving Tool: used to cut the soil in the liquid limit device cup. • Gauge: part of the grooving tool or a separate metal bar, 10.0 ±0.2 mm (0.394 ±0.008 in.) thick and approximately 50 mm (2 in.) long. • Containers: corrosion resistant, suitable for repeated heating and cooling, having close fitting lids to prevent the loss of moisture. One container is needed for each moisture content determination. • Balance: conforming to AASHTO M 231, class G1, sensitive to 0.01 g with a 1200 g capacity. • Oven: thermostatically controlled, capable of maintaining temperatures of 110 ±5°C (230 ±9°F). • Graduated cylinders for measuring distilled or demineralized water. Adjustment of Liquid Limit Device The liquid limit device shall be inspected to determine that the device is in good working order; that the pin connecting the cup is not worn to permit side play; that the screws connecting the cup to the hanger are tight; that the points of contact on the cup and base are not excessively worn; that the l