An Evaluation of the MSA Method for Determining Particle Size Distribution.

摘要

This investigation compares fineness test results for 17fly ashes as obtained by testing in accordance with a number of test methods. The test methods were the Blaine and Fisher air permeability methods,the Klein hydrometer and MAS (Mine Safety Appliance) centrifuging sedimentation methods,and the No. 325sieving method. The objectives of this investigation were to compare particle size data on the various materials as tested by the different methods for evaluating the MSA method,which requires a short time for its performance. The MSA results as compared with those of the other tests show that average particle diameters by that method generally exceed the average particle diameters by the Blaine,Fisher,and Klein hydrometer methods. Determined amounts finer than selected particle sizes,expressed as percentages,are,in general,smaller for the MSA than for the Klein hydrometer or No. 325sieve tests. The comparisons of test values for all of the materials were based on three rounds of tests. Based on the comparisons and student t values,it would appear that the MSA equipment can be used to obtain particle size distribution percentages for samples of fly ash.