The author reports on aercrete's new machine which is claimed to produce structural lightweight concrete on site without the necessity for a coarse aggregate fraction. After a brief reference to existing factory processes (thermalite and durox) which reduce density by the production of gas during mixing, the site-mixed processes which are in use are described: one type entrains air by means of foam (dsocrete and cheecolite are examples) but produces too weak a concrete for primary structural applications, the other type uses tight weight aggregates such as foamed slag, expanded clay, pumice and sintered pfa. The remainder of the article is concerned with aercrete which is claimed to yield densities between 160 and 2200kg/m3 and, typically, 3n/mm2 at 800kg/m3 and 12n/mm2 at 1400kg/m3. It is basically an air-entraining mix involving neither factory curing processes nor artificial aggregates. The concrete incorporates 40 micron diameter protein foam cells which yield a uniform cellulor structure which can withstand handling in the wet state (e.g. when pumped). The article includes information on the machines that have been developed to mix this material which range from models producing 4.2M3 per hour to 82M3 per hour and costing 15,000 pounds. It also discusses the structural roles of aercrete, including brick and block manufacturing processes, which involve cutting the blocks from a mass of concrete using a foam extruding lance, and the possibilities of the production of water floating concrete rafts. /TRRL/

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  • Corporate Authors:

    Morgan-Grampian (Professional Press) Limited

    Morgan-Grampian House, Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Baxter, M
  • Publication Date: 1974-10

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Filing Info

  • Accession Number: 00097976
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM