Aberthaw tests of concrete in sea water . qualparts Lehigh andHelderberg; theiron ore cementpractically freefrom alumina wasHermmoor ErzGerman Portlandcement; and thecement made fromslag was stone usedwas broken traprock from ciuarries , . , . , , , ,, , , General view of the operations in preparing the piers, showing in loreground the method ul, -u r 1 1 -« •- weighing water and measuring sand at Maiden, Mass., a cubic foot weighing pounds, while the voids were found to be 50 per cent. The stone passed a l^-inch ring with the dust screened out. The sand used was clean and
Aberthaw tests of concrete in sea water . qualparts Lehigh andHelderberg; theiron ore cementpractically freefrom alumina wasHermmoor ErzGerman Portlandcement; and thecement made fromslag was stone usedwas broken traprock from ciuarries , . , . , , , ,, , , General view of the operations in preparing the piers, showing in loreground the method ul, -u r 1 1 -« •- weighing water and measuring sand at Maiden, Mass., a cubic foot weighing pounds, while the voids were found to be 50 per cent. The stone passed a l^-inch ring with the dust screened out. The sand used was clean and sharp, and perhaps a little finer than usual. It was obtained from banks at South Acton, Mass., and when weighed dry averaged pounds j)er cubic foot, while the voids were calculated in the dry sand as . per cent. As used in the work, the sand contained per cent of moisture. The specimens were made on the first floor of one of the buildings at the Navy Yard, and while the temperature of the room was kept above freezing. |5] ACTION O F SEA WATER O N CONCRETE point, it was not very warm. The mixer was set on the floor, the feedingchute removed, and the materials were shoveled directly from the floor tothe mouth of the mixer, located about 3 feet higher. The mixed materialswere then dumped into a water-tight mortar box from which they wereshoveled into wheelbarrows and carried a short distance to forms constructedof plank. It should be noted that the specimens were cast in a horizontalposition. In order to give them stiffness so that they could be handled without breaking, a ^-inch twisted square steel barwas embedded in them for theirfull length and projected fromthe upper end, forming a the upper end of each speci-men for a depth of 8 feet therewas also placed a steel pipe ^yiinches in outside diameter. Thiswas used simply to core a hole,and was removed, after thespecimens were set, in the follow-ing manner: Before placing, itwas covered on the outside w
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectconcret, bookyear1920
