C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/11, 403/63
C08J 9/04 (2006.01) C04B 16/08 (2006.01) C08F 12/08 (2006.01)
Patent
CA 1082849
ABSTRACT OF THE DISCLOSURE: A method of making lightweight concrete having a density of 0.340 to 1.060 grams per cubic centimeter which comprises mixing with cement, water, water-reducing admixture and air-entraining agent an aggregate material consisting essentially of a mixture of first and second portions of particles of polystyrene expanded to a density of 0.013 to 0.019 grams per cubic centimeter, the particles being of controlled size such that the first portion thereof consists of beads which in their unexpanded form are substantially all of a diameter between 1.04 and 0.35 millimeters and 90 percent by weight of a diameter between 0.9 and 0.4 milli- meters, and the second portion thereof consists of beads which in their unexpanded form are substantially all of a diameter between 1.29 and 0.35 millimeters and 90 percent by weight of a diameter between 1.24 and 0.58 millimeters, the portions being admixed in a weight ratio of 2.5 to 3.5 parts by weight of the second portion per one part by weight of the first position, the mixture of par- ticles being of such uniformity that ten samples each of approxi- mately 1200 to 1500 cubic centimeters in volume of loose and dry expanded beads exhibit a co-effecient of variation Cv in respect to absolute-volume factor of under 3.0, the aggregate being mixed with water, cement, water-reducing admixture, and air-entraining agent, under conditions such that bead-to-bead contact is subs- tantially wholly avoided. And, a light-weight concrete obtained by this method.
258318
Fairweather Edwin W.
Rady-Pentek Arthur A.
Basf Wyandotte Corporation
Robic Robic & Associes/associates
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