SAMPLING AND TESTING HIGHWAY MATERIALS. 



25 



(49) The time of setting shall be determined by the Gillmore needles. The Gill- 

 more needles should preferably be mounted as shown in figure 12 (b). 



(50) The time of setting shall be determined as follows: A pat of neat cement paste 

 with about a 3-inch diameter and one-half inch thick, with a flat top, mixed to a 



r 



*c 





<- „£l - 



1 

 > 



» 



y 



°K ( 





JC 



& 





irl 





v 



Ifc:.' • "nlif$n}fflfc 





[pTv. ''<?[' 



ill- , m 4- 





iffljffr"" '-iiPmffi 



! 



HI Mr"- limSttr 



I; 



jffiiMili ,; !ij§§§| 



1 











7T — 



c 



<Z>i> 



a 



Ny° 



a. 



to 







E 





o 





fc 





o 



Y 



fO 



.si 



i 





^ 



normal consistency, shall be kept in moist air at a temperature maintained as nearly 

 as practicable at 21° C. (70° F.). The cement shall be considered to have acquired 

 its initial set when the pat will bear, without appreciable indentation, the Gillmore 

 needle one-twelfth inch in diameter, loaded to weigh one-fourth pound. The final 



