US 5,234,754 A · Shaped article and composite material and method for producing same

Abstract

Shaped articles with a coherent matrix which comprises homogeneously arranged inorganic solid particles (A) of a size of from about 50 .ANG. to about 0.5 micron, such as silica dust particles, and densely packed solid particles (B) having a size of the order of 0.5-100 micron and being at least one order of magnitude larger than the respective particles A, such as Portland cement particles, the particles A being homogeneously distributed, especially densely packed, in the void volume between the particles B, are made from an easily flowable composite material containing a very low amount of liquid and an extremely high amount of a dispersing agent, such as a concrete superplasticiser. Test specimens with Portland cement-silica dust-based matrices with dense packing of the silica dust have higher compressive strengths than hitherto reported, and reinforcements such as fibers or steel bars are subject to a high degree of fixation in the dense Portland cement-silica dust matrix because of the density of the matrix contacting the reinforcement such as illustrated in FIG. 5 which shows a plastic fiber incorporated in the dense matrix. Composite material for making shaped article comprises dispersing agent in sufficiently high amount to obtain a viscous to plastic consistency of the composite material with the small volume of liquid necessary to fill voids between particles A and B. The shaping of the composite material may be performed in a low stress field and without exchange of liquid with the surroundings.

Claims37

Dependent claims

A composite material for producing a shaped article, comprising

(1) homogeneously arranged inorganic solid particles A of a size of from 50 Angstroms to 0.5 micron;
(2) densely packed solid particles B having a size of 0.5-100 micron, being at least one order of magnitude larger than the particles A, and defining a void volume therebetween,
the particles A being homogeneously arranged in the voids between particles B in an amount of 0.1-50% of the volume of particles A and B;
(3) a surface-active dispersing agent in an amount sufficient to secure the homogeneous distribution of particles A between the densely packed particles B and to impart to the composite material a fluid to plastic consistency in a low stress field of less than 5 kg/cm.sup.2 ;
and
(4) a liquid in an amount substantially sufficient to fill the voids between the particles A and B;
the dense packing of particles B being substantially a packing corresponding to that obtainable by gentle mechanical influence on a system of geometrically equally shaped large particles in which locking surface forces do not have any significant effect.

4 more elements

Dependencies are inferred from the claim text.

Shaped article and composite material and method for producing same

Life of this patent

Shaped article and composite material and method for producing same

Life of this patent

Abstract

Claims37