Screed

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

Construction method for paining waterproof paint before cement is finally set

Abstract: The invention relates to a construction method for paining waterproof paint before cement is finally set The construction method includes the steps of (1) wetting the base with water at first, blade coating a pure cement layer or a cement screed layer, and coating waterproof paint with a blade after the surface of the pure cement layer or the cement screed layer is dried to form a waterproof layer; (2), or coating waterproof paint with a blade directly before the pure cement layer or the cement screed layer are finally set The construction method for paining waterproof paint before cement is finally set has reaction, solves the problems that adhesion of coating layers and bases or protective layers is insecure, drying speed of water-based paint is slow and requirement on bases is high and the like, construction is simple to operate, technical features of waterproof materials can be fully utilized, the problems that screed-coat layers are not needed to perform construction on concrete bases or cement mortar bases are solved in large-scale construction, paint can form a sealed bonding layer to solve a problem of water leakage of waterproof paint

Screed bar support stake and method

Abstract: A screed bar support stake and method are uniquely adapted to concrete screeding operations utilizing a vibratory-type screed. The stake is formed with means which allow it to be located after the concrete has been poured and is also adapted with means enabling the stake to be removed for reuse before the concrete hardens thus saving the cost of the stake. A mating drive member facilitates easy placement of the stake.

Studio dell'isolamento acustico in laboratorio di materiali provenienti da riciclo applicati alle strutture edilizie

Abstract: The acoustic insulation of elements and materials for building construction is becoming more and more important in Italy due to the recent evolutions in the Italian national regulation. This work concerns the experimental studies on sound insulation and reduction of floors and walls, principally using materials made of recycled rubber and synthetic fibrous panels. In particular, impact noise of floors was investigated, taking also into account the mechanical properties of tested materials. The tests were carried out in a new laboratory, built especially for the evaluation of acoustic properties of building elements. The laboratory has an opening, for testing the transmission loss of walls, and two floors: one is a reference concrete slab and the other is a beam and clay block floor with flanking transmission suppression. The steps of the laboratory construction and the procedure adopted for the qualication of sound fields in the rooms are described in this work. The qualication was carried out for transmission loss and impact noise measurements, with some limitations for the airborne sound insulation of floors. The impact noise of floors was studied considering different issues. The two bare floors acoustic behaviour has been analyzed, pointing out the different sound emission, that is due to the technical characteristics of the building elements. The correlation between impact noise reduction and dynamic stiffness of materials used in floating floors has been studied, in particular as regarding the influence of sample preparation and the choice of the predictive formulas. For some materials, repeated measurements have been carried out, to analyze the influence of the screed aging during impact noise reduction laboratory tests, with the aim of reducing the test waiting time. Impact noise reduction of resilient underfloor heating systems has been investigated: the products have been tested on both laboratory floors to check the influence of the base structure and the evaluation methods; different floor finishings have also been tested. Furthermore, airborne sound reduction of walls was studied to improve the knowledge of the influence of recycled materials (in particular rubber and synthetic fibrous panels) on the acoustic performance of gypsum and covered brick walls. For some of the samples, the influence of electric equipments was also studied.

Concrete-finishing machine

Abstract: A concrete-finishing machine has a drive horse, a slave horse, and a bridge-like truss selectively connectable to, or separable from, those horses at different levels so those horses can roll along surfaces at the same level or at distinctly-different levels. Vertically-directed jacks can dispose a screed or a float at different distances below the level of the bridge-like truss, and that screed and that float can be shifted along the length of that bridge-like truss to avoid obstructions within the area to be concreted. Those jacks can set different sections of the screed at different levels and thereafter simultaneously move all sections of that screed up or down. Interacting surfaces on the jacks and on the bridge-like truss enable those jacks to be readily secured to or separated from that bridge-like truss. The bridge-like truss can consist of a single short, intermediate length or long section, or can consist of various numbers of short, intermediate length and long sections which are so rigidly interconnected that workmen can use that bridge-like truss as a bridge to cross over areas to be concreted and also can sit on the midpoint of that bridge-like truss to work on the concrete without causing appreciable deflection, even where the bridge-like truss is forty feet long. Aligning and coupling members interconnect adjacent sections of the bridge-like truss, and also protect the ends of those sections during the storage and shipment of those sections by projecting outwardly beyond the ends of those sections.

Positive locking concrete screed rail

Abstract: A screed rail assembly for use in the construction of concrete slabs includes an elongated rail having a plurality of locking members that extend outward from the sides of the rail. The locking members provide a positive mechanical connection between the concrete slab and the screed rail, preventing structural damage due to external forces exerted against the slab. An elongated protective strip extends along the top surface of the elongated rail, further protecting the junction between the slab and the rail from damage due to external forces.