AASHTO T191 PDF
Standard Method of Test forDensity of Soil In-Place by the Sand-Cone Method AASHTO Designation: T 1. SCOP. AASHTO. 1). T – Density of Soil In-Place by the Sand-Cone. Method. 2). T – Correction for AASHTO T Section 4 and is summarized as follows: 1). Find the most up-to-date version of AASHTO T at Engineering
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Soils that are essentially granular require extreme care.
Place the empty apparatus upright on a firm level surface, close the valve and fill the funnel with sand. Also, a balance conforming to the requirements of MClass G 2. When the sand stops flowing into the apparatus, close the valve sharply and empty the excess sand Note 2.
Subtract the final mass Step 4. Dig the test hole inside the opening of the base plate, being very careful to avoid disturbing the soil that will bound the hole. This table shows the suggested minimum mass of the moisture content sample in relation to the maximum particle size in soil mixtures.
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After the sand has stopped flowing, close the valve Note 2. Calculate the mass of the sand needed to fill the container, funnel and base plate. Close the valve sharply, remove the apparatus and determine the mass of the apparatus and zashto remaining sand m2. Determine the bulk density of the calibration sand sand calibration factor. Weigh the moist material that was removed from the test hole. The apparatus described t1991 is restricted to tests in soils containing particles not larger than 50 mm 2 in.
Calculate the volume of the test hole to the nearest 1 cm3 0. Drying Equipment—Stove or oven or other suitable equipment for drying moisture content samples.
Calculate the dry in-place dry density of the material removed from the test hole as follows: Divide the mass of the sand needed to fill the container Step 4. In selecting a sand for use, several bulk density determinations should be made using the same representative sample for each determination. Invert the sand-cone filled with sand and seat the funnel in the recess of the base plate. Mix the material thoroughly and secure and weigh a representative sample for moisture determination.
Calculate the moisture content to the nearest 0. Sand—Any clean, dry, free-flowing, uncemented sand having few, if any, particles passing the 0.
Fill the apparatus with sand according to Section 4. Place the base plate on the calibration container Note 1.
Sand Cone Density Apparatus, H
Seat the base plate on the prepared surface. Open the valve fully, allow the sand to flow until the sand stops flowing Note 2. Position the calibration container on a clean, level, plane surface. Open the valve and keep the funnel at least half full with sand during filling. Calibration Container—A sturdy cylindrical container of known volume Vc.
Invert the aahto and seat the funnel in the recess of the base plate. Calculate the dry mass of the material to the nearest 1 g 0.
Appreciable time intervals between the bulk aasnto determination of the sand and its use in the field may result in change in the bulk density caused by a change in the moisture content or effective gradation.
Place the base plate on a clean, level, plane surface. Close the valve sharply, remove the apparatus and determine the remaining mass of the apparatus and sand m4. The mass of sand required to fill the cone and base plate is calculated by the difference between the initial mass Step 4.
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Replace the sand removed in the funnel determination according to Section 4. Calculate the dry mass of the material removed from the test hole as follows: Balances—A balance conforming to the requirements of MClass G Place the apparatus on the base plate, open the valve.
Determining the bulk density aasho sand DB to be used in the field test. Note 2—Vibration of the sand during any mass-volume determination may increase the bulk density of the sand and decrease the accuracy h191 the determination. The apparatus described here represents a design that has proven satisfactory. T 1.