SD-II Sand equivalent test instrument

One, overview

SD-II Sand equivalent test instrument in accordance with Department of transportation JTJ058- 2000(T0334- 1994) Fine aggregate sand equivalent test procedures standard, suitable for asphalt mixing material and cement concrete, sand, sand, stone chips, not exceeding a maximum size of aggregate 4.75mm , Sand equivalent test instrument Contained in the determination of the fine aggregate content or impurities in the clay to assess aggregate cleanliness.

Second, the technical parameters

Third, experimental procedures

1, Lotion with a flush breathing tube until the bottom l00mm Notches (takes about 80ml Rinse).

2And quite 120±1g Dry weight of wet-like funnel carefully pour in the upright tube.

3And batter the lower part of the tube with the Palm to remove air bubbles and wettability of the sample as soon as possible, and then place 10min.

4, In test tube stopper, place the tube level, Oscillation (only wrist oscillations without shaking arm) maintain the amplitude 230±25mm . Oscillation 90Times, and then place the tube vertically in sand equivalent test instrument ,Electric sand equivalent instrument Test bench, unscrew the plug.

5, Will try the cylinder flush insert, use washing liquid attached to the wall of the tube aggregates. Then gradually insert the flush pipe to Tube The bottom, slowly turn the flush pipe, while slowly improving at a constant speed the Commission, attached to the surface of aggregates of soil particle impurities float up, until the solution is 380ml Tick.

6When flushing pipes liquid level in 380ml When you scale, cut off the flush pipe, and then start the stopwatch, in the case of no disturbance, quiet place 20min±15s.

7, With a ruler measure from the bottom of the tube to deposit part of the height of the h1And if possible the same measuring tube to precipitate at the bottom part of the highly accurate LMM . 8, Weight slowly insert the piston tube. Until the precipitate is encountered, tighten the socket screw, move the ruler zero point on the underside of the piston, read sediment from a sleeve height h2Accurate to the LMM . And record humidity in the test tube, accurate to 1 c.

9, For parallel testing of two samples as described above.