Screed

About: Screed is a research topic. Over the lifetime, 1899 publications have been published within this topic receiving 11118 citations.

Floor heating for buildings comprizes rigid foam insulation level rims stiffeners and flats all keyed together to prevent shifting as laid.

Abstract: The insulation level elements, notably rims (A), structural stiffener (B) and flat (C), are made homogenously of rigid foam and the two-layer installation gives heat transmission of at least 0.15 W/(m2K) equal to the requirement of a house with 25 m total insulation thickness or above this when thicker 10 cm plates are employed. One rim element (A) is immovably fixed in the horizontal by key pins (3) and hook-in groove (2) assisted by the conically descending stiffeners (B) and the pull-resistant connection of the raised rim part (A). Plastics grub-screws in the as-cast recesses (4) in the rim element can be screwed through into the second layer to join the two layers below the rims. Supply and disposal pipes, heating and ventilating pipework can be laid in place directly before pouring with concrete which in turn serves without screed for heat storage and solar energy collection etc.

Sound insulating marginal strip for floor structures, and method of manufacturing it

Abstract: In the strip for floor structures comprising bare floor, footstep sound insulating layer and screed, it is proposed to fashion a holding flange (6) from a foamed plastic strip, e.g. under the action of pressure and heat, in which process a step (7) is formed. This step (7) can however also be formed by mechanical means, e.g. by cutting off and/or cutting in. It is also possible to produce the profile for the sound insulating marginal strip (1), even during extrusion with the aid of an extruder and suitable tools, from a thermoplastic to which a foaming agent is added. The sound insulating marginal strip (1) in the angled-off state fits snugly against the associated wall or masonry and, when mounted, is securely held by the holding flange (6).

Road paver comprising a layer thickness measuring device and method for measuring the thickness of a placed material layer

Abstract: A road paver comprises a screed (16) for placing a material layer (42) on a subsoil (14) and a layer thickness measuring device for measuring the thickness (h B ) of the placed material layer (42). The layer thickness measuring device comprises a first sensor (38) for measuring a first distance to the placed material layer (42) and a second sensor (40) for measuring a second distance to the subsoil (14). The layer thickness measuring device is permanently connected to the screed (16).

Vibration Analysis and Control of a Vibration Screed System for Asphalt Pavers

Abstract: To reduce shaking of a vibration screed system (VSS) and improve the paving performance of an asphalt paver (AP), the root-mean-square (RMS) acceleration responses at points on the front and rear screed floors are analyzed via an experimental method. A 3D nonlinear dynamic model of the VSS is also built to evaluate the influence of the dynamic parameters of the VSS on the compression efficiency, paving quality, and working stability of the AP based on the objective functions of the vertical, pitching, and rolling RMS values at the centre of gravity of the screed. The angular deviations, α and γ, of the tamper are then controlled to improve the paving performance. The research results show that the excitation frequency, ft, and both angular deviations, α and γ, of the tamper strongly affect the paving performance. The compression efficiency is quickly enhanced, while both paving quality and working stability are significantly reduced with increasing the excitation frequency ft and reducing the angular deviations. α and γ. and vice versa. Additionally, the screed shaking and paving performance of the AP are remarkably improved by control of the angular deviations, α and γ, under different working conditions.