0.
Introduction This method is intended to serve as a rapid field correlation test. The purpose of this method is to indicate, under standard conditions, the relative proportions of clay-like or plastic fines and dusts in granular soils and fine aggregates that pass the No. 4 (4.75 mm) sieve. The term "sand equivalent" expresses the concept that most granular soils and fine aggregates are mixtures of desirable coarse particles, sand, and generally undesirable clay or plastic fines and dust.
Perform the test at a location free from vibration. Excessive vibration may cause the suspended material to settle at a greater rate than normal. Do not expose the plastic cylinders to direct sunlight any more than is necessary. Occasionally it may be necessary to remove a fungus growth from the working calcium chloride solution container and from the inside of the flexible tubing and irrigator tube. This fungus can easily be seen as a slimy substance in the solution. 1.
Materials Stock Solution - The materials listed below will be required: • 454 g (1 lb) of technical grade anhydrous calcium chloride, • 2050 g (1640 ml) .of USP Glycerin, and • 47 g (45 ml), cif formaldehyde (40 volume % solution). Dissolve the 454 g of Calcium chloride in ½ gal (1.89 litres) of distilled water. Cool and filter through ready-pleated rapid filtering paper. Add the 2050 g of glycerin and· the 47 g of formaldehyde to the filtered solutlon, mix well, and dilute to 1 gal. (3.
NOTE 4: Experiments show that as the amount of material being reduced by splitting or quartering is decreased, the accuracy of providing representative portions is decreased. For this reason, it is imperative that extreme care be exercised when preparing the test specimens. 1. Split or quarter enough material to fill four tin measures to the brim or slightly rounded above the brim in the following manner: A.
If a cast is formed that permits careful handling without breaking, the correct moisture range has been obtained. If the material is too dry, the cast will crumble and it will be necessary to add water and remix retest until the material forms a cast. If the material shows any free water it is too wet to test and must be drained and air-dried, mixing if frequently to ensure uniformity.
4. Allow the wetted specimen and cylinder to stand undisturbed for 10 ± 1 minute. 5. At the end of the 10 minute soaking period, stopper the cylinder: then loosen the material from the bottom by partially inverting the cylinder and shaking it simultaneously. 6.
• Continue to apply a stabbing and twisting action while flushing the fines upward until the cylinder is filled to the 15 in. (381 mm) graduation. Then raise the irrigator tube slowly without shutting off the flow so that the liquid level is maintained at about the 15 in. graduation while the irrigator tube is being withdrawn. Regulate the flow just before the irrigator tube is entirely withdrawn and adjust the final level to the 15 in. graduation. 9.
2. If the calculated sand equivalent is not a whole number, report it as the next higher whole number. For example, if the sand equivalent were calculated from the example in 12 above, the calculated sand equivalent would be: (3.3/8.0) X 100 = 41.2 Since this calculated sand equivalent is not a whole number it would be reported as the next higher whole number which is 42. 3. If it is desired to average a series of sand equivalent values, average the whole number value determined as described above.
Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is responsible for the transportation charges. Humboldt Mfg. Co.
