Lightweight aggregate for concrete and method for making same

Details Lightweight aggregate for concrete and method for making same Lightweight aggregate for concrete and method for making same

1974-07-24

1976-11-16

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

106 72, 106304, 252 6256, 106 87, 106 41, C04B 1500

Patent

active

039922162

ABSTRACT:
The invention provides a lightweight aggregate for eventual use in making concrete having commercially acceptable compressive strength. Bloating agents of iron oxide serve to greatly expand conventional aggregate under conventional heat treatment. Small beads of heat decomposable plastic may also be mixed with finely divided aggregate base material prior to pellet extrusion after which furnace heat treatment creates a strong, porous pellet. Modifications in handling the aggregate process improve product control and in some of the completed aggregate serve to seal outer surfaces of aggregate against fluid penetration.

REFERENCES:
patent: 2902379 (1959-09-01), McCollum et al.
patent: 2961399 (1960-11-01), Alberti
patent: 3140956 (1964-07-01), Kamlet et al.
patent: 3258349 (1966-06-01), Scott
patent: 3425577 (1969-02-01), Copley
patent: 3844812 (1974-10-01), Fishwich
patent: 3854972 (1974-12-01), Kratochvil

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