A method and apparatus for making concrete slabs for use as building walls and other purposes. The slabs have a textured surface formed by partially embedding a multiplicity of elements in a shallow layer of fine granulated material supported in the bottom of the slab form. The slab making apparatus comprises a self contained, self powered machine movable along the edges of the form and having conveyor means oeerable to distribute concrete mix gradually onto the layer of textured aggregate witho...

A means for towing and feeding a rail-mounted slip form paver has a self-propelled tug unit, a draw bar structure adapted to connect the unit and the paver in spaced relation, a hopper on the tug for receiving fluid concrete and including archimedes screws for delivering the fluid concrete to one end of a conveyor carried by the draw bar structure, a discharge chute at the other end of the conveyor for delivering fluid concrete in advance of the paver and a separating member between the paver an...

Disclosed are colored flake-form effect pigments comprising one or more layers, where at least one of the layers comprises one or more colorants or is itself a colorant and at least one of the layers has a groove or grid structure, and to processes for the preparation thereof, and to the use thereof.

A concrete finishing machine having a movable framework mounted transversely over a paved area and defining an axis. A carriage is movably attached to the framework and has means for moving the carriage along the length of the framework. The carriage carries at least one rotating auger unit having leading and trailing portions mounted on one shaft and a finishing member. The auger unit has a leading portion having a helically arranged blade with an outer edge that is positioned in a fixed, space...

An assembly for paving concrete roads and other similar areas is disclosed having a width adjustable screed attached to a lightweight frame structure and utilizing mechanical vibrators in conjunction with a crown-shape finishing pan to produce a finished concrete road.

Dense silica-encapsulated aluminum flake pigment in aqueous suspension is treated with a carboxylic chromic chloride. Such treated pigment is stabilized against gassing when in contact with water. Aqueous-based coating compositions containing such pigment exhibit improved storage stability.

This invention relates to aqueous coating compositions comprising non-leafing aluminum and a combination of certain non-ionic surfactants.

There is provided a process for preparing a low- or non-dusting substantially non-volatile (preferably highly light reflective) metal flake pigment composition, which comprises ball milling atomized metal powder in a milling fluid substantially comprised of water, in the presence of one or more corrosion inhibitors and a substance which acts as a lubricant for the milling process. Optionally, the paste may be formed into granules for easy storage. Preferred metal pigments are aluminum or gold br...

The present invention provides an aluminum pigment having a high grade of optical characteristics, such as a high brightness and a high flip-flop effect. In particular, an aluminum pigment having a mean particle diameter d.sub.50 of 5-35 .mu.m, a ratio of the mean particle diameter d.sub.50 (.mu.m) to a mean thickness t (.mu.m) of 30-90, and a mean surface roughness Ra of 20 nm or less, is disclosed. A method for manufacturing the aluminum pigment of the invention is also provided.

A method of manufacturing metallic, especially aluminum flake pigments comprises comminuting metallic flake particles in an inert solvent such as mineral spirit and in-line screening of the slurry thus formed in at least two in-line cylindrical rotary screens with different mesh size. The screening system is fully enclosed to avoid solvent emissions. The finished product has consistent flake particle size distribution with brighter metallic finishes than conventionally produced products.