PORTLAND-CEMENT CONCRETE 



73 



mortar flushing. Locks shall be provided, if directed 

 or called for by the plans. 



(c) In reinforced concrete the length of these sections may be 

 materially increased at the option of the Engineer. 



318. Facing: 



(a) The facing may be made by carefully working the coarse 

 stone back from the form by means of a shovel, bar, or 

 similar tool, so as to bring the excess mortar of the con- 

 crete to the face. 

 Or, 



(6) About 1 in. of mortar (not grout) of the same pro- 

 portion as used in the concrete may be placed next to 

 the forms immediately in advance of the concrete, in 

 order to secure a perfect face. 



(c) Care must be taken to remove from the inside of the 

 forms any dry mortar in order to secure a perfect face. 



319. Proportions. The proportions of the materials in the 

 concrete shall be as specifically called for by contract, or as set 

 forth herein, upon the lines left for that purpose, the volume of 

 cement to be based upon the actual cubic contents of 1 barrel 

 of specified weight. 



320. Finishing: 



(a) After the forms are removed, which should generally be 

 as soon as possible after the concrete is sufficiently 

 hardened, any small cavities or openings in the face 

 shall be neatly filled with mortar, if necessary in the 

 opinion of the Engineer. Any ridges due to cracks 

 or joints in the lumber shall be rubbed down with chisel 

 or wooden float. The entire face may then be washed 

 with a thin grout of the consistency of whitewash, 



