Arizona republican., 1920-11-21

inch the water content is reduced This is the consistency test
 One thing has been omitted in the description of the laying of the con- crete and that is the curing process. There is a covered frame work resting on wheels which use the sides of the steel forms for a track and that is run along over the newly finished surface or concrete The covering is about 100 feet in length and is designed to pro- tect the surface against the sun and flying particles of dirt until the initial setting has been made. The surface is then covered with earth and kept thoroughly wet. The entire curing process will cover a period not less than 21 days.
 South Center Street Work
 No mention has yet been made of the work on South Center street which is now well under way by Contractor Kisselburg on a sub-contract from Twohy Bros. This is a contract of about four and a half miles. The ma terial is taken from the river nearby and is washed at a plant there and hauled to the road in trucks. These trucks are divided into four compart ments each, containing a cubic yard of aggregate. The truck load is dumped into the mixer, a compartment at a time. The cement is put in sen arately. Though this mixer two years ago was the latest word in concrete mixers. it is passee in comparison with those employed on the main part of the contract.
 But the road work will be as good. The same specifications are employed and the plant is equipped with a me chanical tamper. The only difference between the work on South Center street and that on the Yuma road is that the latter is going on much faster
 Inspection
 Chief Engineer Perkins is a daily visitor at the place of road building. making personal investigation of the character of the mix and conferring with the inspectors. TNle inspector at the eastern end of the Yuma road pro- 1ect is Mir. Goodwin, former division | highway engineer for Arizona and a member of Arizona Chapter of the American Society of Engineers. MT. f Williams inspector at the other end of the road was for a long time connected with the Indiana state highway de- partment. George Yocco is in general charge of both mixers and the sub grade. The inspector on the South Center street job is Mir. Stevens who had charge of the concrete work at Camp Kearny with the rank of captain An inspector on this work is MT. Hodg- in, resident engineer with long ex- 2 perience in highway work in the Mis- souri department
 The laboratory of the commission is busy place with tests of various kinds being made. But the most i'm portant tests are those of the cement with which no chances are taken Every car Is thoroughly gone over Within the last week several carloads have been rejected by the chief engin- eer for the reason that the set oc- cured too quickly. Under the contract car of cement is allowed to stand for S3 hours before its actual delivery for the job and the test must be made within that time,
 The members of the commission say that they believe that when finished the roads of the county highway pro- gram will be the best roads in the United States of their width and that they will have cost less than any roads that have been built within the last five years.