Abstract:
A form for concrete strike-off includes a pan adapted to float on a plastic concrete surface, a rigid straightedge, and a support. The straightedge is coupled on one end to the pan and the support is coupled to the opposing end of the straightedge with the straightedge thereby defining a reference elevation for concrete strike-off operations.
Abstract:
A form for concrete strike-off includes a pan adapted to float on a plastic concrete surface, a rigid straightedge, and a support. The straightedge is coupled on one end to the pan and the support is coupled to the opposing end of the straightedge with the straightedge thereby defining a reference elevation for concrete strike-off operations.
Abstract:
A system is provided for the collection of measurements for use by a surface profiling processing scheme. A movable platform is equipped to: (i) generate a measurement of inclination of a surface when the platform is and stationary thereon, (ii) generate measurements of surface curvature as the platform traverses the surface, (iii) monitor distance that the platform traverses during a measurement run, (iv) generate a signal each time the platform traverses a predetermined amount of distance during a measurement run where the signal is such that the user is alerted to stop the platform, (v) collect measurements of curvature while the platform traverses the surface, and (vi) collect measurements of inclination at the starting position, stopping position, and each time the platform is stopped during the measurement run.
Abstract:
A movable platform is provided for use with a surface profiling system. The platform eliminates all errors associated with wheel inconsistencies. A frame is supported above a surface by, among other supports, three supports arranged in a linear alignment that defines a direction of travel for the frame. The three supports are defined by a front support, a rear support and a center support centered between the front support and rear support. The center support is a floating support capable of substantially vertical movement. At least two of the front support, rear support and center support are wheels configured to roll in the direction of travel defined by the three supports that are linearly aligned. These wheels are coupled to one another for synchronizing rolling movement thereof on the surface.
Abstract:
A floating screed device has a first section for cutting through plastic concrete and a second section for floating on the plastic concrete. The first and second sections are coupled together by a mechanism that moves the first section relative to the second section in a direction perpendicular to the planar bottom of the second section as the floating screed device is moved through a volume of unfinished plastic concrete.
Abstract:
A floating screed device has an elongated float and an elongated blade movably coupled to the elongated float so that the blade is freely movable in pitch.
Abstract:
A floating screed device has an elongated float and an elongated blade movably coupled to the elongated float so that the blade is movable in pitch.
Abstract:
An anti-lock braking system includes a moveable member to be braked and a friction brake for applying a braking force. A controller actuates the friction brake in accordance with braking force demands. Braking force demands are determined by the controller by electrical input signals received from a signal generator that is mechanically linked to the brake pedal, as well as by signals from a slip sensor. The slip sensor records values from wheel speed sensor and computes values that may indicate a slippage condition. Based on the recorded and computed values, the slip sensor and sends electric signals to the controller. The friction brake includes a prestressed piezoelectric element that is lightweight, less cumbersome, and highly controllable as compared with prior anti-lock braking devices, and is actuated via electrical signals rather than a mechanical system. A modification is disclosed in which an anti-lock system is placed on each wheel with independent slip sensors providing signals to controllers that control application of braking forces over each wheel as necessary.
Abstract:
A concrete slab on ground system includes a first slab portion and a second slab portion. The first slab portion is disposed on a ground substrate and includes geopolymer cement (GC) concrete. The second slab portion is disposed on the first slab portion and consists of Portland cement (PC) concrete. The first slab portion may be mixed in-situ and left in an unfinished state such that only the top or exposed surface of the second slab portion need be finished.
Abstract:
An integrated concrete slab includes concrete with stretchable fibers mixed therein covering and partially integrated with a portion of concrete that contains either no fibers or relatively few fibers mixed therein.