. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . Fig. 215n. CUBICAL CONCRETE MIXEH. or the reinforced concrete steel bridge, is tosecure a roadbed similiar to that in a cut or onan embankment, the designer of the concrete steelbridge who reduces the dimension of the concreteon account of the additional strength secured fromthe steel beams, may in a few years find his struc-ture too light for the heavier and longer of the causes which have led to the 350 BUILDING AND REPAIRING
. Building and repairing railways ... : Forming one of the series of the volumes comprised in the Revised and enlarged edition of The science of railways, . Fig. 215n. CUBICAL CONCRETE MIXEH. or the reinforced concrete steel bridge, is tosecure a roadbed similiar to that in a cut or onan embankment, the designer of the concrete steelbridge who reduces the dimension of the concreteon account of the additional strength secured fromthe steel beams, may in a few years find his struc-ture too light for the heavier and longer of the causes which have led to the 350 BUILDING AND REPAIRING STANDARDS OF CONSTRUCTION. 351 adoption of concrete and concrete steel construc-tion are (1) the facility with which this kind ofconstruction can be used at places where stonewhich will stand the weather is difficult to secureor if it can be obtained is expensive. (2) thecomparative ease with which material for thisstyle of construction can be obtained and therapidity with which the work can be done. (3 )the ability to use less skilled labor to advantage,than where stone cutters and masons are required. The cost of concrete steel construction is lessthan masonry. In some cases as much as 30/S incost is claimed to be saved but this will of neces-sity depend on local conditions. At one localitythe cost of a stone which will stand the weathermay be expensive and at another it could besecured at a moderate figure—again the differ-ence in the cost of cutting and dressing stonesecured from different quarries must be consid-ered. For these reasons the percentage of savingin any contemplate
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1906
