. Engineering and Contracting . .1:2:4 Class A bridge concrete for con-crete arch, slab and girder bridgesthroughout, reinforced abutmentsand wing walls and coping of grav-ity sections IH 1:2^:5 Class B bridge concrete for bodyof gravity section pier and abut-ment 2% 1:2:3^4 Class C bridge concrete for thin sections and floors of steel bridges ?i 1:1%:1« Hand rail concrete for hand rails — all bridges ?s ... Hand rail concrete for hand rails - all bridges V^ l:2:3>/4 Type A (single course) concrete pavement . 2 1:2:3 V^^earlng course Type B (two course) concre
. Engineering and Contracting . .1:2:4 Class A bridge concrete for con-crete arch, slab and girder bridgesthroughout, reinforced abutmentsand wing walls and coping of grav-ity sections IH 1:2^:5 Class B bridge concrete for bodyof gravity section pier and abut-ment 2% 1:2:3^4 Class C bridge concrete for thin sections and floors of steel bridges ?i 1:1%:1« Hand rail concrete for hand rails — all bridges ?s ... Hand rail concrete for hand rails - all bridges V^ l:2:3>/4 Type A (single course) concrete pavement . 2 1:2:3 V^^earlng course Type B (two course) concrete pavement ^4 1:2:4 Base course Type B concrete oavement 2 1:3:5 Base course monolithic brick pave-ment 1 •??. 1:2% Dry mortar coat monolithic brick pavement Vi .... 1:1 Filler grout monolithic brick pave-ment * . 1:3:5 Concrete base for pavements 1% .... 1:2 Concrete curbing with concrete base for pavements ^k .... 1:2:3% Concrete curb and gutter % 1:4 Cement-sand base scml-monolith- ic brick ^4 ..... Fig. 2—Diagran two sizes will be more than the original volume. For in-stance, 1 cu. yd. of pit run gravel may yield cu. yd. ofsand and cu. yd. of coarse aggregate. The percentageof sand to use w^ith the diagram tor proportioning pit run ma-terials under Case 1 may be found as follows, for the aboveexample: .70 Percentage of sand = = .70 + .50This figure will agree reasonably close with the percent-age determined by separating the sizes by weighing. There- Profit>r/,oni /fe^ P^t ffi^n Or. C/oxsJ
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
