File:A practical treatise on natural and artificial concrete; its varieties and constructive adaptations (1879) (14577196310).jpg

Identifier: practicaltreatis00reid (find matches)
Title: A practical treatise on natural and artificial concrete; its varieties and constructive adaptations
Year: 1879 (1870s)
Authors: Reid, Henry
Subjects: Concrete
Publisher: London, New York, E.& F.N. Spon
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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le only by a vigilant attentionto its accurate properties, which should jprecede and notfollow its use. Birkenhead Docks. In these extensive operations, carried on under the direc-tion of Mr. Lyster, the engineer to the Liverpool DockBoard, a considerable quantity of concrete has been used forthe walls and other works. The aggregate used was prin-cipally broken stone and the best Portland cement in theproportion of ten to one, six to one, and three to one of theformer to one of the latter, according to the nature of thework. The proportions are first mixed together in a drystate, and then put through a concrete mixer, shown inFig. 55, the general arrangement of which is the inventionof Mr. Le Mesurier, the resident engineer. The machine as illustrated is ready for work, and may bedriven by a 5 horse-power engine. A A are hoppers of about 2 cubic feet capacity, into whichare put the aggregate, either direct from the stone breakeror by hand, and as they revolve on the turntable on which
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302 A PRACTICAL TREATISE ON CONCRETE. they are placed, the cement and sand (when necessary) areadded. When the hopper in revolving reaches the points B,a valvular arrangement effects the deposition of its contentson to the elevator band, by which it is carried to the mixingcylinder, at the point C, where the desired amount of wateris added, and the whole, after mixture, is delivered intobarrows or trucks at the shoot D. In addition to the advantages of simplicity and portabilitythis machine is most efficient, and can easily produce 150cubic yards of good concrete at a cost of 4:d. per cube yard. Although we have referred only to this concrete mixer, itis not because there are none other, but simply to show theadvantages, derived from mechanical means, of bringing theaggregates and matrices into accurate combination beforethe water is applied. The reference to the Malaxator atpage 165, and the Greyveldinger mortar mill at page 177,illustrates the advantages of mechanical appliances in

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