product manual H-2795 H-2795_man_1109 Roll-a-Meter
Directions
The Solution The accuracy of Roll-a-Meter results is not dependent on the correctness of all these factors, but gives directly the percent air in the sample. It is unnecessary to know anything about the weight or physical characteristics of the ingredients which are supposed to be in the mix.
• there must also be accurate batching and accurate recording of all ingredients (including water) in the batch. • thorough mixing of all ingredients. • accurate measurement of the sample taken for an entrained air test How reliable is the unit weight method? It is possible for two well-qualified laboratory technicians to run parallel tests on all the above details and to come out with results differing materially in apparent entrained air.
Important Care should be taken to have approximately the same proportions of mortar and course aggregate as are used in the mix. Larger than 2-inch aggregate should be discarded and air determinations made on the balance. After proper agitation, the air, accompanied by some foam, rises to the top. This should be allowed to stand, with occasional light agitation until the bubbles practically cease rising.
be invaluable. No change of mix can be made without a resulting change in the percentage of air entrained with the same amount of air entraining agent being used.
2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. Graduated Tube Brass Cup Gauge Tube Glass Clamp Ring Top Glass Gaskets Bottom Glass Gaskets Upper Chamber Chamber Gasket Adjusting Nuts Brass Gasket Ring, Chamber Base (Brass) Guide Pin Baffle Funnel Assemby Toggle Pin 16. Toggle Lever 17. Spring Retainer 18. Jay Bolt 19. Jay Bolt Spring 23. Brass Plug for Cap 28. Clamp Assembly (15-19) NOT Shown 20. Brass Measuring Cup 21. Strike-off Bar 22. Spanner Wrench 24. Tamping Rod 25. Syringe 26. Carrying Case 27.
Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is responsible for the transportation charges. Humboldt Mfg. Co.
