404 EEIBLING AND REYES. 



Table XVI. — Free lime and soundness of the cements recorded in Table XV. 



Sample 

 No. 



Description. 



' Microscopic test. 



Soundness (5-hour steam 

 test). 



(»)1 



Nonaerated under- 



Plumes and needles in abundance 



Completely disintegrated. 





burned clinker. 



but not as many plumes as No. 2. 





C)2 



Nonaerated hard- 



Mostly good large plumes (very 



Very slightly d i s i n t e- 





burned clinker. 



bad). 



grated soft and off plate. 



3 



Aerated underburned 



A few plumes, many rosettes of 



Sound. 



. 



clinker. 



needles. Not nearly so bad as 

 . No. 4. 





4 



Ae r a t e d hard-burned 



Plumes in long needles in abun- 



Soft, slightly disintegrated 





clinker. 



dance (very bad). 



and off plate. 



a These are the same cements given in Tables III and V. 



When the experiment was repeated, using selected, perfectly sintered 



clinker which contained no free lime and which remained perfectly 



sonnd after the boiling test, the results were more conclusive. (Table 

 XVII.) 



Table XVII. — The influence of the dtsgree of fusion on the rapidity of absorption 



(brand L cement). 



[Figures show percentages.] 



Description. 



Perfectly fused clinker con- 

 taining no free lime 



Do 



Perfectly fused clinker con- 

 taining no free lime + 2 

 per cent plaster 



Underburned clinker con- 

 taining free lime 



Do „ 



Underburned clinker con- 

 taining free lime + 2 per 

 cent plaster 



Fineness.™ 



Through a 

 200-mesh 

 sieve. 



Through a 

 100-mesh 

 sieve. 



100 



100 



100 



100 



100 



100 



90.8 



100 



90.8 



100 



90.8 



100 



Increase in weight at 

 different ages. 



c 



be 



03 



0.40 ; 0.3(1 

 0.40 I 0.38 



0.40 ! 0.38 



0.53 

 0.53 



0.53 



0.98 

 0.99 



0.80 



03 



-a 



03 

 l> 



1.32 



2.74 



1.32 



2.65 



1.23 



2.51 



2.00 



3.29 



2.09 



3.38 



1.92 



3.35 



3.39 



o3 



0.79 



4. 72 0. 84 



«: CO 

 EJCN 



03 3 



2.90 

 2.92 



2.54 



3.88 

 3.94 



a The clinker which contained no free lime was ground much finer than the underburned 

 clinker in order to insure the accuracy of the main conclusion. Had the cements been 

 ground to the same fineness the difference would have been greater, quantitatively. 



When these figures are plotted in curves (figure 13) those for the 

 underburned cement result in a parabola while the perfectly fused cement 

 gives a straight line. Other absorption curves are also plotted in figure 

 13; these show the variability which has been encountered. 



