. Electric railway journal . winter, naturally was hampered onaccount of the severe and freezing weather. To attempt to exe-cute concrete work by working a day now and then is poor econ-omy and heating the constituents of the concrete or adding saltto the water has many drawbacks. On looking into what rep-resented the latest practice along this line, it was found thatvery good results could be obtained by using calcium chlorideat a temperature even as low as 15 deg. F. In a cubic yardof one part of cement, two parts of sand and four partsof stone, 20 lb. of calcium chloride may be added. This
. Electric railway journal . winter, naturally was hampered onaccount of the severe and freezing weather. To attempt to exe-cute concrete work by working a day now and then is poor econ-omy and heating the constituents of the concrete or adding saltto the water has many drawbacks. On looking into what rep-resented the latest practice along this line, it was found thatvery good results could be obtained by using calcium chlorideat a temperature even as low as 15 deg. F. In a cubic yardof one part of cement, two parts of sand and four partsof stone, 20 lb. of calcium chloride may be added. This in-creases the cost by approximately 25 cents per cubic yard. is a view of the concrete bridge built with this mixture. Sofar as the design is concerned, it may be of interest to statethat concrete through girders were not used, but concretearches were turned between entirely encased Bethlehem rolledsteel 30-in. girder beams. This scheme allowed the buildingof the bridge without seriously interfering with the railroad. June 18, 1910.] ELECTRIC RAILWAY JOURNAL. tracks underneath it, besides obtaining maximum clearance. field engineering Thus two very important conditions were satisfied without Good way engineering has not been very conspicuous in interfering with the most economical method of construction the past on many properties, because guessing and the rule of for the strength required. thumb have prevailed. Intelligent engineering has often been
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