For use with a power trowel, an abrasive assembly attachable to a rotatable arm of the power trowel that comprises a circular, rigid plate having a central hub projecting out from a first major surface and affixed to its second major surface is a ring of a resilient material. Adjacent the resilient ring is a molded plastic ring in which a plurality of permanent magnet members are imbedded at regularly spaced intervals. The plastic ring further includes at least, one boss projecting outward from a surface thereof and designed to fit within an aperture disposed in an outermost ring, which is entirely or partially of a ferrous metal and which carries a plurality of abrasive members on its outer surface. The resilient ring is fastened to the rigid plate by internally threaded tubular pins and the plastic ring is secured by screws that pass through the plastic ring into the lumens of the internally threaded tubular pins.

Grouting tiles and/or mosaics today even for large areas such as commercial environments, offices, shopping malls, etc. is achieved using professionals who work through the entire process on their hands and knees. It would be beneficial to provide building contractors, individuals, etc. with a machine to implement some or all of these steps thereby allowing a wider range of tiles and tile effects to be implemented. Equally a handheld unit may be employed by amateurs such as when decorating residential environments in order to improve the quality of their work and reduce the time taken. Such devices according to embodiments of the invention allowing use of smaller tiles, tiling mosaics, etc. without the costs of these visually effective and attractive designs being prohibitive.

The invention provides a float trowel blade attachment for cement floor finishers comprising a rectangular section of sheet metal having a top surface and a bottom surface and having its edges optionally bent upwardly, means for providing to the top surface a three-sided rearwardly open pocket on the back of the section adjacent the leading edge thereof adapted to partially receive a finish trowel blade of the finisher, a spring clip secured to the top surface or the pocket-forming means and extending rearwardly therefrom so as to be engageable with the finish trowel blade to retain the section thereon, and wherein said rectangular sheet metal has attached to its bottom surface using an adhesive or mechanical attachment material interlayer, a composite rigid abrasive element bonded to a resilient backing.

A grouting pan assembly includes a reinforcement ring. In another aspect, a grouting pan includes a substantially planar bottom surface and a curved sidewall surrounding the bottom surface. In a further embodiment, a grouting pan assembly includes a grouting pan having a post or mechanical fastener extending from a backside thereof for attachment to a reinforcing ring or layer.

A method for a mechanical treatment of a concrete floor, such as troweling and blade finishing, using a hand-operated, a walk-behind or a ride-on actuator, such as a concrete power trowel machine, a floor treatment machine or the like, is described. The actuator has one or more operating heads comprising a rotor consisting of two or more attachment arms. The floor surface is treated by means of concrete troweling elements, such as circular trowel pans or elongated trowel blades attached to the rotor attachment arms, made substantially of plastic material, that are detachably coupled to the rotor of the actuator, in particular to prevent discoloration of the treated floor surface during treatment. Before the concrete floor is troweled with plastic-based concrete troweling elements, a water-soluble silica-based medium is applied on it.

The invention relates to a smoothing device (100, 200) for smoothing a structural concrete component (1), comprising a primary cutting edge (104, 204, 204, 204, 204) for separating a concrete layer from the structural concrete component, an axis of rotation (102, 202), and a smoothing surface (106, 206) aligned orthogonally to the axis of rotation (102, 202) for surface contacting of a cut surface of the structural concrete component (1) formed by the separation.

For use with a power trowel, an abrasive assembly attachable to a rotatable arm of the power trowel that comprises a circular, rigid plate having a central hub projecting out from a first major surface and affixed to its second major surface is a ring of a resilient material. Adjacent the resilient ring is a molded plastic ring in which a plurality of permanent magnet members are imbedded at regularly spaced intervals. The plastic ring further includes at least, one boss projecting outward from a surface thereof and designed to fit within an aperture disposed in an outermost ring, which is entirely or partially of a ferrous metal and which carries a plurality of abrasive members on its outer surface. The resilient ring is fastened to the rigid plate by internally threaded tubular pins and the plastic ring is secured by screws that pass through the plastic ring into the lumens of the internally threaded tubular pins.

An apparatus for grinding a concrete floor surface, in order to perform grinding with a manual, a pullable or a ride-on concrete trowel machine is provided. The apparatus comprises a concrete trowel organ to be used with the concrete trowel machine and a diamond grinding arrangement, such as one or several diamond disks or like, to be coupled in connection with the concrete trowel organ removably by means of a fastening arrangement. The fastening arrangement for coupling the diamond grinding arrangement in connection with the concrete trowel organ comprises a fastening frame, being in connection with the diamond grinding arrangement that exits on a scrubbing surface of the concrete trowel organ, and a fastening part extending from the fastening frame and, while going through the concrete trowel organ, getting supported against a back surface of the same.

A decorative concrete with a very uniform finish surface and a method of fabricating the same is disclosed. A concrete mixture is poured over a subgrade which defines an exposed surface. The exposed surface is finished with any of several techniques, and the surface is then worked with an abrasive material, and additional techniques are used to color and seal the concrete.

Methods and apparatus are provided for finishing a composite floor. The apparatus includes a grouting pan configured to be affixed to the rotating head of a finishing machine. The grouting pan has a planar bottom surface and a curved sidewall. Grouting pans are rotated over a prepped surface such that the curved sidewalls trowel the mortar onto the rough composite surface and the bottom surface which is in contact with the prepped floor forces the mortar into the surface voids such that a grouted surface.