×

Stabilization of extremely lightweight aggregate concrete

  • US 4,895,598 A
  • Filed: 05/18/1988
  • Issued: 01/23/1990
  • Est. Priority Date: 10/05/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. Method of producing a monolithic lightweight aggregate concrete of a density of 700-1200 Kg/m3 in fully dried condition composed of lightweight cement mortar including hydraulic cement, sand, fine and extremely lightweight particles, air bubbles and water mixed together with coarse lightweight aggregate,characterized by the fact thatthe low density of the cement mortar of the lightweight aggregate concrete is constituted by replacing sand at least partly by an equivalent volume of small air bubbles with a diameter in the range of approximately from 20 to 500 micrometers so that the volume of air bubbles is in the range of 5 to 30% of the volume of cement mortar and expanded organic and inorganic aggregate of particle density less than 200 Kg/m3 and of a size approximately from 0.2 to 2 mm and a volume from 5-20% of the volume of cement mortar in such a way that the total particle volume of the cement mortar constitutes nearly a continuous size distribution, the stability is increased and the homogenity is maintained of the fresh cement mortar and concrete by adding polymer microparticles and equivalent organic microparticles in the amount of 0.1-5.0% of the cement weight,said polymer microparticles consisting of a mixture of at least two different types,a first type consisting of synthetic polymer particles having a diameter of 0.1-1.0 micrometers on the surface of which an anionic or a combination of anionic-nonionic calcium stable surfactants have been adsorbed to an amount of 0.1-5.0% by weight of the synthetic polymer, anda second type consisting of natural or synthetic polymer microparticles having a diameter of 0.5-10 micrometers on the surface of which an anionic or anionic-nonionic calcium destabilizable combination of surfactants have been adsorbed to an amount of 0.1-5.0% by weight of the natural or synthetic polymer, wherein the weight ratio between the second type microparticles and the first type microparticles is in the range from 1:

  • 3 to 1;

    6.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×