three cubic feet <>f sand and sixcubic feet of gravel when mixed together make but little more thansix cubic feet of material.Proportions The concrete for the abutments of bridges and for the sidesfor Bridge anj footings <,f culverts, should be proportioned 1 sack Port-land cement, i\-)… … UNIVERSAL PORTLAND CEMENT CO. 13 The mixing is just as important as any other part of the process of making concrete. After the proper materials have been selected and the .. . proper proportions determined, the mixing must be done in a manner which will insure the covering of every particle of…
Bridges · Concrete · Culverts
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
