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THE ALLIANCE GEOTECHNICAL GROUP, INC. (AGG) August, 2011 This test method covers a procedure for determining the relative resistance of concrete (including concrete overlays and impregnated concrete) to abrasion under water. This procedure simulates the abrasive action of waterborne particles (silt, sand, gravel, and other solids).
Significance and Use:
1. This test method is intended to qualitatively simulate the behavior of swirling water containing suspended and transported solid objects that produce abrasion of concrete and cause potholes and related effects.
2. This test method should provide a relative evaluation of the resistance of concrete to such action.
3. The results are expected to be useful in selection of materials, mixtures, and construction practices for use where such action is to be expected.
4. The test method is not intended to provide a quantitative measurement of the length of service that may be expected from a specific concrete.
Test Specimens
The test specimen shall be cylindrical in shape, having a diameter approximate 6-mm (1/4-in.) less than that of the inside diameter of the test container and a height of 100 ± 13 mm (4 ± ½ in.). It may be molded from freshly mixed concrete or cored from hardened concrete. Cores shall be taken in accordance with Methods C42/C42M.
Procedure
1. Place the specimen in the test container with the surface to be tested facing up and the seating blocks in place.
2. Position the specimen so that its surface is normal to the drill shaft and the center of the specimen coincides with the drill shaft.
3. Mount the agitation paddle in the drill press. The bottom of the agitation paddle shall be 38 ± 5 mm (1 ½ ± ¼ in.) above the surface of the specimen.
4. Determine and record the mass of the abrasive charge to the nearest 10 g (0.02 lb). Place it on the surface of the specimen and add water of the same type as used in the saturation period to 165 ± 5 mm (6 ½ ± ¼ in.) above the surface of the specimen.
5. Start paddle rotating and check that the paddle is rotating at the required speed with the paddle immersed.
6. Remove the specimen from the test container at the end of every 12 h of operation. Flush off the abraded material and surface dry. Determine and record the mass of the specimen in air and in water.
AGG is HUB (Historically Underutilized Business) Certified as of November 10, 2010 and in March 2011 AGG was certified by (D/FW MSDC) Dallas/Fort Worth Minority Supplier Development Council, Inc. as a MBE
Our clients can expect the same quality work and superior service they have always received in the past. Robert has brought new energy and has stepped up QA/QC on all projects with project managers having more of a hands-on approach as well as being accountable for the QA/QC portion of each project in which they are managing.
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