ASTM grade Sand Absorption Cone & Tamper Price in Bangladesh
Descriptions
Sand Absorption Cone & Tamper
The Sand Absorption Cone and Tamper is used in determining the specific gravity and water absorption of fine aggregates smaller than 10 mm. The apparatus is manufactured from plated steel for protection against corrosion.
Thoroughly mix the sample and reduce the sample to the required size in accordance with AASHTO T 248 (Reducing Field samples of Aggregates to Test Size). The sample size for this procedure is approximately 1000g of material passing the No. 4 (4.75 mm) sieve.
Dry test samples to constant weight in an oven set at 230 ± 9°F (110 ± 5°C). Cool the sample at room temperature for 1 to 3 hours. After the cooling period, immerse the sand in water at room temperature for a period of 15 to 19 hours. 3 Instead of completely immersing the sand in water, AASHTO considers sand to be “soaked” if the sand is maintained at a moisture content of at least 6% for the prescribed period. This is the recommended procedure to eliminate the need to decant excess water from the sand prior to testing. The decantation process is time consuming and difficult, since great care must be taken to avoid decanting some of the sample along with the water. Additionally, the sand will be much closer to the SSD condition when soaked at 6% moisture, which expedites the dry procedure.
Decant water from sample, avoiding loss of fines. Spread the sample on a flat, non-absorbent surface. Stir the sample occasionally to assist in homogeneous drying. A current of warm air may be used to assist drying procedures (Figure 2); however, fine particles may be lost with this procedure if not careful. Figure 2 A current of air being used to achieve SSD condition.
Determine the SSD condition of the sand using the Cone Test. Note: Throughout the process of drying in Step 3, test the sand for SSD condition using the cone method. Place the cone with the large diameter down on a glass plate. Fill cone to overflowing with drying sand. Lightly tamp the fine aggregate into the mold with 25 light drops of the tamper. Each drop should start about 1/5 in. above the top surface of the fine aggregate. Remove loose sand from base and carefully lift the mold vertically. If surface moisture is still present, the fine aggregate will retain the molded shape. When the sand achieves an SSD condition, the sand will slump
Images are reference only. Actual product may be different.
Click Our Social Network Links
