. Portland cement concrete pavements for country roads. e that it sets ud under uniformly favorableconditions. THE USE OF REINFORCING STEEL. Probably the most satisfactory method, in point of efficiency, yetdevised for reducing the number of objectionable cracks in concretepavements is that of employing steel reinforcement. The reinforce-ment usually consists of woven wire or some similar material, thoughthere is no apparent reason why plain round or square rods mightnot be satisfactorily used. One-quarter-inch round rods embeddedabout 2 inches above the lower surface of the pavement and space
. Portland cement concrete pavements for country roads. e that it sets ud under uniformly favorableconditions. THE USE OF REINFORCING STEEL. Probably the most satisfactory method, in point of efficiency, yetdevised for reducing the number of objectionable cracks in concretepavements is that of employing steel reinforcement. The reinforce-ment usually consists of woven wire or some similar material, thoughthere is no apparent reason why plain round or square rods mightnot be satisfactorily used. One-quarter-inch round rods embeddedabout 2 inches above the lower surface of the pavement and spacedabout 12 inches center to center in both directions would seem suffi-cient to eliminate practically all objectionable cracking, provided *proper joints were introduced at changes in the grade and at curvesin the alignment. But any satisfactory system of reinforcement willprobably add from 15 to 20 cents per square yard to the cost of thepavement, and this additional cost is no doubt responsible for the Bui. 249, U. S. Dept. of Agriculture. Plate XJW C£/VTCf*ffS/r TO 707S4Z. Af^C. Diagram Showing Results of Hardness Tests of Cement Mortars. Bui. 249, U. S. Dept. of Agriculture. Plate VIII k 1 S/f/YSSS 723 MS orcEM 9 OAKS - 1 v \ 1 SP£C/M£MS C(//?£0 2 ENTTO SMO —- ^v^ (i/r/WG&t* f W£J6 wras£z>/H5 T£A£> c ?rs7z 2/CAf. yrrj ^ ?•-- - --- .^, \ \\ k-^ \ \ w V \ ^ ^c- s. —— 077X IW S7 ?4//04, £*/ V COX ^ *^> ??^^ •^. ^^S, / ls^.^_ yS ^ \ / \ y \ v\j !\ \ 3 \ 0 > - ? $ 15 * 52 $ % § 5 &£/? C£NT C£M£/VT TO TVTAtL M^C % \ >JT V «) S) N fi Diagram Showing Results of Toughness Tests of Cement Mortars. Bui. 249, U. S. Dept. of Agriculture. Plate IX. X N 7000 X % 6000 I 1 £ 3000 1 1 1 1 1 1 *~ 1 —--. -—^ HX/&OUS P/fOPOtfr/CWS £C/> V£/*S *-^ ~~-~- ---- ——-^. V ^^^- \\ \ \\ \ ^s \ \ ^^ n: \\ ^ ^ ^Y 07 7>7*K4 ST4
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Keywords: ., bookcentury1900, bookdecade1910, bookidportlandceme, bookyear1915
