Public works . ^ inches in the center, ofwhich the east eighteen miles is of one-course con-struction and the remainder of two-course construc-tion. The old roadway was ninety per cent, ordi-nary earth and ten per cent, sand-clay surface. Thecharacter of the soil is such that the pavement can be. >N 11 Vl;i_lK a\-i;l l;ivi;i; \:fa>WASHING PLANT AND DELl\Kl;lNG IT Tl ? AND January 28, 1922 PUBLIC WORKS 69 laid direct on subgrade without any foundationcourse. The concrete in the one-course construction isproportioned 1:2 ^4 of Portland cement, clean pitsand and gravel, s
Public works . ^ inches in the center, ofwhich the east eighteen miles is of one-course con-struction and the remainder of two-course construc-tion. The old roadway was ninety per cent, ordi-nary earth and ten per cent, sand-clay surface. Thecharacter of the soil is such that the pavement can be. >N 11 Vl;i_lK a\-i;l l;ivi;i; \:fa>WASHING PLANT AND DELl\Kl;lNG IT Tl ? AND January 28, 1922 PUBLIC WORKS 69 laid direct on subgrade without any foundationcourse. The concrete in the one-course construction isproportioned 1:2 ^4 of Portland cement, clean pitsand and gravel, screened from the Arkansas riverand pits. The two-course construction is 1 :l3/$ :2j^top course, with same coarse aggregate as lor the one-course except for grading, and a pit-run aggregatebase. The proportion for the base course is de-termined by the per cent, of pit run aggregate re-tained on a one-fourth inch screen and varies from1:334 to 1:5 of Portland cement and total volume pitrun material. This produces a base of nearly uni-form strength which will test not less than eighteenhundred pounds per square inch on twentj-eight daytest. The entire project was let with proposals for grad-ing, culverts and pavement separately, or combinedbids on grading and culverts, or total bid. Bids w
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
