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#### Summary

Two approaches to determine the reference distribution for cement were examined. In Approach 1 all data available with no consideration of the measurement method were used. On Approach 2 only the data generated with the LAS-W method were used. In both cases, a mean distribution was generated. Figure 4 shows the two distributions generated. It can be noticed that the two curves are not very different, but somewhat higher values are calculated, especially in the fines, when only the LAS-W data are used.

In the second step, the cements were corrected using a correction factor. The correction factor is the ratio between the measured data and the reference distribution. The results of this correction are shown in Appendix D-1 and D-2.

The calculated mean distribution curve could be used as a reference to calibrate any instrument to be used for measuring the PSD of cement. Eventually, this method for generating the reference distribution could be standardized and be attached to the specifications of the SRM 114p or any other future SRM cement.

Figure 4: Comparison between the distribution calculated from all the data and the one calculated from only the LAS-W data.

Table 5: Data from LAS-W without the sets L and R. The results from the Bootstrap calculation is also shown. In bold the data that are outside the 95 % confidence limits and in the yellow area the data that are more than 5 % outside the 95 % confidence limits.
Size
µm]
Data from LASER Wet Bootstrap results
B C D F G H I J K N O Q T U X Mean Low High
1 17.2 10.7 6.9 15.1 6.8 7.1 15.7 - 5.2 0.0 1.3 8.3 14.4 13.6 4.5 8.9 6.4 12.1
1.5 22.2 14.3 10.3 18.2 11.7 12.6 18.3 0.10 8.3 0.05 3.6 14.2 19.9 18.6 6.4 11.8 8.5 15.2
2 25.2 17.0 12.9 20.6 15.2 16.1 20.7 2.2 11.1 3.9 6.3 18.5 23.3 22.4 8.3 14.9 10.9 17.9
3 29.1 21.4 17.6 23.7 20.5 20.8 25.2 8.8 16.2 23.0 11.5 25.6 27.8 27.4 12.3 20.8 17.2 23.5
4 32.1 25.2 21.5 27.6 24.8 24.4 29.3 2.9 20.6 32.0 16.3 29.1 31.2 31.2 16.4 24.9 21.1 27.6
6 37.7 31.9 28.2 35.0 31.8 30.6 36.3 18.9 28.0 38.1 24.2 36.2 37.2 38.5 23.9 31.7 29.0 34.4
8 43.4 37.5 34.0 40.8 37.6 36.5 42.1 24.1 34.1 46.7 30.5 42.3 43.1 45.4 30.4 37.8 34.7 40.8
12 55.6 47.3 44.1 47.6 47.3 48.0 51.7 34.7 44.1 63.4 41.0 52.4 53.8 59.2 41.5 48.7 45.2 52.5
16 67.2 55.6 53.0 55.3 55.4 58.6 59.9 45.9 52.5 78.7 50.0 60.8 62.7 71.1 51.0 58.4 55.0 63.1
24 84.1 69.0 68.7 69.1 69.2 76.6 73.2 63.5 66.1 93.8 65.0 74.3 76.1 86.4 66.6 73.5 69.7 78.9
32 92.8 79.3 78.9 79.4 79.8 88.4 82.9 75.9 76.2 98.0 76.6 83.9 85.2 93.8 78.3 83.3 80.1 87.2
48 98.6 91.4 91.8 89.0 92.5 97.8 93.7 90.2 88.2 99.8 90.3 94.7 94.7 98.7 91.7 93.5 91.9 95.6
64 99.9 96.3 96.7 95.4 97.8 99.6 98.0 95.5 93.7 100.0 96.3 98.7 98.0 99.7 97.3 97.5 96.6 98.5
96 100.0 98.9 99.2 99.2 99.6 100.0 100.0 98.5 97.4 100.0 99.4 100.0 99.7 100.0 100.0 99.5 98.9 99.7
128 100.0 99.5 99.7 99.5 99.8 100.0 100.0 99.34 98.1 100.0 99.6 100.0 100.0 100.0 100.0 99.7 99.3 99.9

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