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Following experience of occasional cracks appearing near the spring brackets had one or more further batches of Class 7 Standard Pacifics been built to complete the intended 91 engines the chassis would have been rearranged to be similar to that used on the solitary Class 8 Standard Pacific and that drawn up by Derby Drawing Office for the 2nd batch of Class 6 Standard Pacifics.
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For the St1.5/Al1 batch, this region lies at 5 weeks, whereas for the St1/Al1.5 batch, this phenomenon is evident at about 10 weeks.
We calculate a rate constant of k = 0.6 (± 0.1) × 10-5 s-1 for the 10 1 batch mixture.
XRD and NMR data show that this is a valid assumption because virtually no CaO/SiO2/Al2O3 starting material is left after 24 h for the 10 1 batch reaction and 6 8 h for 5 1 batch mixture.
Comparison of our rate data for the 5 1 batch mixture to those reported by Shaw et al [9] show that our rate constant is remarkably close.
For the 5 1 batch mixture, too few time points were collected during the early stages of reaction to reliably calculate a rate constant.
Comparison of Al-CSH and tobermorite data show that the summation of αTob and αCSH is less than 1 during the first 15 h of reaction for the 10 1 batch experiment (Figures 12).
Results from the batch reaction at a solution:solid ratio of 5 1 are shown in Figure 7 and are similar to those for the 10 1 batch reaction except that growth kinetics are much faster.
Figure 10 for the 10 1 batch reaction shows that growth of tobermorite and disappearance of Al-CSH are relatively rapid in alkaline medium and are nearly complete after 3 days.
Figure 8 27 Al MAS NMR of amorphous Al 2 O 3 starting material ( [6] Al ~ 9 ppm ; [4] Al ~ 62 70 ppm) and Al-CSH and tobermorite solids ( [4] Al ~ 54 68 ppm) for the 10 1 batch reaction.
Figure 12 Line-fits to the Al-CSH gel XRD reflection at 29.5 2 θ (a) and tobermorite XRD peaks at 29.1 2 θ (220) and 30.1 2 θ (222) (b) are shown for the 10 1 batch reaction.
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