



70 























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60 







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J 



1 







50 





t3 





 J3 









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u 







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g 



. 60 









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40 







J2 

 O 



1 







.i 



i^r 













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r ' 



r 





s 









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w 





J 



m 



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30 



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u 





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20 



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1 



Tube: Copper k-alphaj 

 Current: 15 ma 





















Voltage: 35 kv 

 Time constant: 4 sec 

 Scan rate: 1 deg/min 







10 













1 II 



Concrete curing: on-land field 

 Concrete age: 20 months 



1 1 1 



38 35 



32 29 26 23 



Diffraction Angle, 29 (degrees) 



Figure A-2. X-ray diffraction pattern for concrete from W-39 control block. 



25 



