Engineering and Contracting . and sewcrase. $2,000; drainage andwater filtraticm. $8(100; asphalt streets, $11,-fiOO; canal wr,rk, $..,?100. cracks arc of comparativelysmall moment, but longitudinal cracks consti-tute the point of vulnerable attack made bythe advocates of other forms of pavements,and comprise and induce at least 80 per centof the damage appearing in the average pave-ment. Within the last twelve months thewriter has discovered the cause of the diffi-cult, ascertained the remedy, and with confi-dence recommends such pavements to hisclientage and all nnmicipalities an
Engineering and Contracting . and sewcrase. $2,000; drainage andwater filtraticm. $8(100; asphalt streets, $11,-fiOO; canal wr,rk, $..,?100. cracks arc of comparativelysmall moment, but longitudinal cracks consti-tute the point of vulnerable attack made bythe advocates of other forms of pavements,and comprise and induce at least 80 per centof the damage appearing in the average pave-ment. Within the last twelve months thewriter has discovered the cause of the diffi-cult, ascertained the remedy, and with confi-dence recommends such pavements to hisclientage and all nnmicipalities and countieswho will put away present guess niethi5ds of design and adopt the true scientific systemwhich leaves nothing to uncertainty. The forces which cause longitudinal crack-ing of a concrete roadway are now prettygenerally conceded to arise from slight ver-tical movements which occur in the shallowfoundation as the seasons change throughoutthe year. The assumption has heretoforebeen almost universally made that liy means. Fig. 2. View of Narrow-Gage Portable Track Laid Along the Shoulder of a Road for Construction Purposes. of much rolling and great refinement in com-pacting the subsoil absolute stability in thefoundation may be obtained. This is a mis-take, as witnessed by tlie fact that our mostcareful constructors in .Michigan, Maryland,Illinois, Iowa and other states who ex-treme care in all foundation and drainagework are producing as large a percentage ofhmgitudinal cracks as is found in the workof the average engineer. In fact inore ver-tical movement is realized by over-compact-ing earth to a point beyond its natural densitythan by just sufl^cicnt rolling to bring it toa point of natural density. Experiments havebeen conducted by the writer and others dem-onstrating tliis fact. The true idea of per-fect construction is rather to provide a pave-ment slab with sufficient strength to maintainits integrity iinder all probable conditions ofthe foundation, expecting
Size: 1268px × 1971px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
