Public works . CROSS-SECTION OF LOCH RAVEN DAM. CrTY OF^ BALTIMORE. DCPACTMCNT OF PUBLIC IMPCOVEMENTS WATEE DEPARTMENT EAI5ING LOCH EAVEIN DAM CONTRACT NO 49 MAR. 20, 1922 . LAYOUT OP CONTRACTORS PLANT FOR CONSTRUCTING LOCH RAVEN DAM June 17, 1922 PUBLIC WORKS 439 of clay, which was twice the amount authorized bythe specifications, but it was accepted after thor-ough tests had been made, one to three mortarbriquettes showing an average of 250 pounds persquare inch, which is 50 pounds above the standardrequirement. At different times, as the work pro-gressed, 4-inch cubes were made from concret
Public works . CROSS-SECTION OF LOCH RAVEN DAM. CrTY OF^ BALTIMORE. DCPACTMCNT OF PUBLIC IMPCOVEMENTS WATEE DEPARTMENT EAI5ING LOCH EAVEIN DAM CONTRACT NO 49 MAR. 20, 1922 . LAYOUT OP CONTRACTORS PLANT FOR CONSTRUCTING LOCH RAVEN DAM June 17, 1922 PUBLIC WORKS 439 of clay, which was twice the amount authorized bythe specifications, but it was accepted after thor-ough tests had been made, one to three mortarbriquettes showing an average of 250 pounds persquare inch, which is 50 pounds above the standardrequirement. At different times, as the work pro-gressed, 4-inch cubes were made from concrete as itpassed from the chutes into the dam. The com-pressive strength of these cubes at the end of 28days averaged 1,800 pounds for 1-3-6 concrete and2,200 pounds for 1-2-4 concrete. The sand waswell graded from small to large and contained aconsiderable percentage of gravel for which reduc-tion was made in the stone. The clay seemed tolubricate the concrete, causing it to be more easilymixed, chuted and worked. The concrete produceda smaller
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
