1. Preparation before the test a. Before the experiment, the pendulum instrument should be inspected and calibrated according to JTJ058-94 Appendix A (see the operating rules of the pendulum instrument for details).
b. After assembling the test mold and applying soapy water (or release agent), dry it.
c. The sifting Material is sieved, and the 10-15 mm pellets are washed with water and then dried in an oven at a temperature of 110±5 °C.
d. Dry the sand in an oven.
e. Filling and feeding: the curing agent and the epoxy resin are mixed uniformly in a mass ratio of 1:4 to 1:5, and then the binder and the dry sand are mixed at a mass ratio of 1:4 to 1:4.5. After even, the filler is formed. Generally, the amount of filler in a pellet test mold is about 9.6 g of epoxy resin, 2.4 ml of curing agent and 48 g of dry sand.
2. Preparation of test pieces a. Discharge: Arrange the prepared aggregate particles in the test mold and arrange them as closely as possible. Stones with small diameters may also be subjected to a buffing test when required, but the particle size should be greater than 5 mm, and the process in the part should be more careful.
b. Blowing sand: Fill the dry sand with a small spoon into the gap of the prepared pellets, and gently blow the dry sand with the ear wash to make it densely packed. Then blow off the excess sand so that the sand is flush with the steps in the test mold. The test mold was preheated in an oven at a temperature of 40 ° C together with dry sand.
c. Production: take out the test mold which blows the sand in the oven, fill the epoxy resin into the test mold, and fill it as densely as possible. Then, use the putty knife to scrape the excess filler and make it fit with the test die. level.
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