Systems and methods for treating concrete, which includes the steps of wetting a surface of concrete with colloidal silica, allowing time for the colloidal silica to penetrate the concrete surface, and cutting the surface of the concrete with a bladed or segemented tool wherein the longitudinal blade or edge portion is positioned approximately at an angle between 30 degrees and 90 degrees relative to the surface of the concrete.

A concrete trowel including: a frame; a handle assembly extending from the frame for controlling the concrete trowel; a plurality of rotors coupled to the frame, each of the plurality of rotors including a plurality of blades; a drive assembly mounted to the frame including a plurality of motors, each mounted to a respective rotor of the plurality of rotors, operable to provide torque to the plurality of rotors to rotate the plurality of rotors about respective rotational axes; and a steering control system mounted on the handle assembly configured to selectively adjust the torque provided to one or more of the plurality of rotors and/or a rotational direction of one or more of plurality of rotors.

Systems and methods for treating concrete, which includes the steps of wetting a surface of concrete with a amorphous colloidal silica, allowing time for the colloidal silica to penetrate the concrete surface, and cutting the surface of the concrete with a bladed tool wherein the longitudinal blade portion is positioned approximately at an angle between 30 degrees and 90 degrees relative to the surface of the concrete.

A concrete trowel includes a frame, a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor, a rotor rotatable about a rotational axis and including a plurality of blades, wherein the rotor includes an attachment portion that is received within a receiving portion of the drive hub, and a quick-change coupling for selectively attaching the rotor and the drive hub for co-rotation therewith. The quick-change coupling includes a spring that imparts a spring force on the attachment portion of the rotor and wherein the spring remains on the drive hub when the attachment portion of the rotor is removed from the quick-change coupling.

A power unit is configured for use as part of a concrete screed and includes a frame and a powered drive. The frame includes a drive housing. The powered drive is operably supported by the drive housing and is configured to rotate a rotatable concrete forming drum. The powered drive includes an electric motor and a battery operably coupled to the electric motor and configured to power the electric motor. The powered drive includes a drive shaft drivingly connectable relative to the drum, with rotation of the drive shaft causing corresponding rotation of the drum.

A concrete trowel including: a frame including a blade guard extending therefrom; a drive assembly including a motor mounted on the frame and a drive hub configured to receive torque from the motor; a rotor rotatable about a rotational axis within the blade guard and including a plurality of blades and an attachment portion for selectively engaging the drive hub; and a quick-change coupling for selectively attaching the rotor and the drive hub for co-rotation therewith, wherein the quick-change coupling includes: a pull-through clamp configured to fit through the attachment portion of the rotor and imparts a clamping force on the attachment portion along the rotational axis of the rotor to clamp the rotor to the drive hub along the rotational axis, wherein the pull-through clamp includes a spring that remains on the drive hub when the attachment portion of the rotor is removed from the quick-change coupling.

Embodiments relate to a flex hub mount for a circular brush assembly. The flex hub mount includes a disc having a disc upper surface and a disc lower surface, a disc aperture, and a disc rib extending from the disc upper surface. The flex hub mount includes a flex pad having a flex pad aperture. The flex pad is dimensioned to rest on a portion of the disc upper surface between the disc aperture and the disc rib. The flex pad aperture and the disc aperture are in vertical registry. The flex hub mount includes a plug disposed within the disc aperture. The plug is configured to connect or be held adjacent to the flex pad. The plug and the flex pad are configured to close the disc aperture such that the disc aperture is sealed.

A battery-powered troweling machine is driven by an electric motor powered by a pair of twenty-four volt batteries coupled in series to drive a planetary gearbox to rotate a trowel blade assembly engageable with the surface of the poured concrete. The controls are carried by a detachable handle that is connectable with a receiver box that traps the handle between interior and exterior stops and uses over center clamps to maintain the handle in proper position within the receiver box. The controls at the rearward distal end of the handle can be used to vary the speed of rotation of the troweling assembly, to adjust the pitch of the individual trowel blades through an actuator and linkage assembly, to initiate actuation of the electric motor and to provide an emergency stop for the operation of the troweling machine.

A concrete trowel includes a frame, a drive assembly including an electric motor mounted on the frame having an output shaft extending from the motor defining a drive axis, a guide handle extending from the frame for controlling the trowel, a battery pack for supplying electrical power to the motor, and a rotor including a plurality of blades, the rotor rotatably coupled to the drive assembly for rotating about a rotational axis that is coaxial with the drive axis.

Systems and methods for controlling a power trowel. A power trowel includes a handle including a speed control input, a housing, a shaft connecting the handle and the housing, a safety mechanism located on the shaft, a blade assembly positioned below the housing, a motor located within the motor housing and coupled to the blade assembly, and a controller. The safety mechanism includes a safety lever configured to move in response to an uncontrolled condition of the power trowel. The controller is connected to the motor and the safety mechanism. The controller is configured to drive, in response to actuation of the speed control input, the motor, detect a movement of the safety lever from a first position to a second position, and perform, in response to the movement of the safety lever to the second position, a safety operation.