. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . to be carefully and accurately per-formed. Mechanical means are resorted to for this operation,and on its extent and character will pretty much dependthe value of the resulting concrete compound. Howeverdesirable it may be to use the best qualities of Portlandcement or lime, in some localities their great cost necessi-tates the employment of common limes, and in such casesthe greatest care must be exercised owing to the want ofcohesive value in matrices of that class. The mixing processunder
. A practical treatise on natural and artificial concrete; its varieties and constructive adaptations . to be carefully and accurately per-formed. Mechanical means are resorted to for this operation,and on its extent and character will pretty much dependthe value of the resulting concrete compound. Howeverdesirable it may be to use the best qualities of Portlandcement or lime, in some localities their great cost necessi-tates the employment of common limes, and in such casesthe greatest care must be exercised owing to the want ofcohesive value in matrices of that class. The mixing processunder these circumstances must be done carefully and inas dry a condition as possible. The mechanical arrange-ment designed by M. Coignet for the perfect amalgamationof the materials is of an ingenious character, and as itsemployment in the preparation of some of our concrete ESTABLISHED PROCESSES OF CONCRETE MANUFACTURE. 165 mixtures may be found desirable, we will shortly describeThe Malaxator. This machine consists of twin screws, whose blades inter-lock each other, travelling in the same Figs. 21 and 22 represent elevation and plan (partly insection) of the Malaxator. 166 A PRACTICAL TREATISE ON CONCRETE. The machine is fixed on a frame at the upper end ofwhich is placed the necessary gearing to actuate the shaftsof the screws.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1879
