Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1975-08-14
1977-07-12
Poer, J.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
260 4213, C04B 735
Patent
active
040351920
ABSTRACT:
A resilient material such as rubber is pulverized into particles. The particles are then coated with dry cement. In one embodiment of the invention the coating may be accomplished by heating the particles until their outer surfaces become viscid and the mixing the particles with cement so that when the cement contacts the viscid outer surfaces, it will adhere thereto, enveloping the particles with a layer of cement. In another embodiment, the cement may be heated and then brought into contact with the particles. The outer surfaces of the particles will become adhesive and the cement will adhere thereto. In a further embodiment, the particles may be coated with a plastic film. The plastic coated particles are then coated with cement as described. Alternatively the plastic coated particles may be mixed with the cement before the plastic has set. The cement will adhere to the still unset plastic coating. In each of the embodiments, the cement will be permanently bonded to the particles. The cement coated particles are then combined with additional cement to form a cement and aggregate mixture at a predetermined ratio of particles to cement.
When water is added to the cement and aggregate mixture in an amount sufficient to cause the cement to set or gel irreversibly, a light weight, resilient concrete is formed. Since the cement is bonded either directly to the particles or to the plastic coating surrounding the particles, it will not readily separate therefrom and the particles will become an integral part of the concrete which results in the concrete having physical properties different from ordinary concrete.
Where the particles are coated with plastic to aid in the adhesion of the cement to the particles, the plastic film further acts as a barrier to prevent fluid flowing over the concrete from contacting the particles and picking up impurities which would stain the concrete.
REFERENCES:
patent: 1409091 (1922-03-01), Goddard
patent: 3503771 (1970-03-01), Kroyer
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