Articoli correlati a Concrete-Block Manufacture; Processes and Machines
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...of the indispensable means of producing strength, but is the most potent of all means for securing impermeability, inasmuch as it is the cement alone which can so thoroughly seal the pores of a block that water may not pass. Too much attention has been given to means for reducing the amount of cement used in making blocks. Inasmuch as cement is the most expensive of the raw materials, and hence constitutes a considerable item in the total cost of production, it has been thought advisable by the promoters of this industry to adopt every means for its saving. The danger-line has too often been passed. It is not chiefly cheapness, but more especially excellence, which will raise the concrete block to an important place among building materials. On every hand the effect of improper condensation is visible. Out of a hundred concrete blocks of ordinary manufacture, how many do not disclose, on close and careful examination, an unequal degree of compactness in different sections, and how many are free from pores on the surface? It is plain that this is primarily due to the intermittence of energetic and languid tamping, and hence we have as remedies the pneumatic tamper on the one hand and the mechanical and hydraulic presses on the other. While the hydraulic press makes a strong point of its heavy pressure, it would seem to be excessive, as it is evident that there is a limit to the amount of pressure which can be advantageously employed. If the particles are brought close together it is sufficient; and any considerable excess of pressure must force the plastic cement from between the particles it should bond, or cause fracture of arched aggregates. It would seem that the rational solution of condensation is reached in those presses which apply...
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- EditoreTheClassics.us
- Data di pubblicazione2013
- ISBN 10 123031055X
- ISBN 13 9781230310558
- RilegaturaCopertina flessibile
- Numero di pagine44
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