A treatise on architecture and building construction . rammed with a woodenrammer, until the cement flushes, or shows on top of eachlayer. This method causes the different layers to imite, andmake one solid, homogeneous mass, and is preferable tothrowing the concrete from a platform into the trenches, asby the latter method the concrete does not become con-solidated. MASONRY. 23 Should one layer have become partly set before anotherlayer is put down, the concrete should be swept clean,scratched with a rake, and well wet before the next layer isput in place. Sometimes it becomes necessary to la
A treatise on architecture and building construction . rammed with a woodenrammer, until the cement flushes, or shows on top of eachlayer. This method causes the different layers to imite, andmake one solid, homogeneous mass, and is preferable tothrowing the concrete from a platform into the trenches, asby the latter method the concrete does not become con-solidated. MASONRY. 23 Should one layer have become partly set before anotherlayer is put down, the concrete should be swept clean,scratched with a rake, and well wet before the next layer isput in place. Sometimes it becomes necessary to lay concrete in runningwater, and unless some means is devised to protect it dur-ing the laying, the water will wash the cement away fromthe concrete, and weaken it. By making large bags of oiledcotton and filling them with concrete, and then loweringthem into the excavation, the concrete will set before thewater can wash the cement out. 48. As before stated, quicksand, when confined, can besafely built upon. Fig. 14 shows a method of confining quick-. iJSSigS iS§gglg8^1&^
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