ASTM D2419:14 pdf free download – Standard Test Method for Sand Equivalent Value of Soils and Fine Aggregate.
9.4.2 Test Specimen Preparation. Procedure B:
9.4.2.1 Maintaining a free-flowing condition, dampen the material sufficiently to prevent segregation or loss of fines.
9.4.2.2 Split or quarter out I000 to 15(K) g of the material. Mix thoroughly with a hand trowcl in a circular pan by scooping toward the middle of thc pan while rotating it horizontally. Mixing or remixing should be continued for at least I mm to achieve uniformity. Check the material for the necessary moisture condition by lightly squeezing a small portion of the thoroughly mixed sample in the palm of the hand. If a cast is formed that permits careful handling without breaking. the correct moisture range has been obtained, lithe material is too dry. the cast will crumble and it will be necessary to add water and remix and 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 it frequently to ensure uniformity. This overly wet material will form a good cast when checked initially, so the drying process should continue until a squeeze check on the drying material gives a cast which is more fragile and delicate to handle than the original. If the “as received” moisture content is within the limits described above, the sample may be run immediately. If the moisture content is altered to meet these limits. the sample should be put in the pan. covered with a lid or with a damp towel that does not touch the material. and allowed to stand for a minimum of 15 mm.
9.4.2.3 After the niinimuni curing time, remix for I mm without water. When thoroughly mixed. form the material into a cone with a trowel.
9.4.2.4 Take the tin nasure in one hand and push it directly through the base of the pile while holding the free hand firmly against the pile opposite the measure.
9.4.2.5 As the can travels through the pile and emerges. hold enough hand pressure to cause the material to fill the can to overflowing. Press firmly with the palm of the hand, compacting the material until it consolidates in the can. The excess material should be struck off level with the top of the can. Illoving the edge of the trowel in a sawing motion across the brim.
9.4.2.6 To obtain additional test specimens. repeat the procedures in 9.4.2.3 through 9.4.2.5.
10. Preparation of Apparatus
10.1 Fit the siphon assembly to a 1.0-gal (3.8-L) bottle of working calcium chloride solution. Place the bottle on a shelf 36 ± 2 in. (90 ± 5 cmabove the working surface, (see Fig. 4).
Noii Il—Instead of the 1.0-gal (3.11-1) bottle, a glass or plastic va has ing a larger capacity may be used provided the liquid level of the working solution is maintained hctween 36 and 411 in. (90 and 120 cm) above the wtd surface.
10.2 Start the siphon by blowing into the top of the solution bottle through a short piece of tubing while the pinch clamp is open.