Лако-красочные материалы — производство

This is the name given to the composite bridge deck slabs developed by the Wolfson Bridge Research Unit at Dundee University (1-3). The concept was developed with the object of developing a bridge deck with a weight saving over the conventional alternatives. Because a large part of the cost of medium and long span bridges […]

Sandwich construction describes an assembly of flanges and webs of great structural efficiency in bending; a lightweight low-modulus shear-resisting core or ‘web’ is implied sandwiched between two outer high-modulus skins or ‘flanges’.

8.1 Introduction It has already been observed that structural adhesive bonding, either alone or in combination with other methods of fastening, represents a key enabling technology for the exploitation of new as well as existing materials, and for the development of novel design concepts and structural configurations. This potential has been helped by developments in […]

The adhesives to be used in making joints between timber members are specified in BS 5268: Part 2 (24). Permissible adhesive types based on the exposure conditions of the joint are reproduced here as Table 7.4. ‘Weather and Boil Proof (WBP) products such as resorcinol and phenol-formaldehyde are stipulated in damp con­ditions whereas melamine and […]

The use of reinforced concrete as a construction material has expanded enormously since the 1960s, not least for road and bridge structures and for marine applications. In both situations there is the possibility of ingress of chloride ions, in the first instance from the use of de-icing salts and in the second from the effects […]

Applications of resins as true adhesives in new construction have been relatively scarce but increasing use is being made of epoxies in the joints between units in segmental precast, prestressed bridge construction (see Fig. 7.9). Using this technique long span bridges can be constructed by stressing precast concrete segments together to form a monolithic structure. […]

A potential structural application of epoxy resin adhesives in bridge construction is to use them to form the necessary shear connection between steel girders and the concrete deck slab in composite bridges, in place of conventional welded mechanical fasteners. There are three ways in which bonded shear connections between steel and concrete might be achieved. […]

Steel wire and strand formed into cables is commonly used in the prestressing of concrete and in suspended or cable stayed structures such as bridges. In both cases it is sometimes necessary to splay the constituent wires or strands at the end anchorages in order to spread the load being transferred to the support material. […]

There are two basic methods by which steel bolts and bars may be anchored into concrete, masonry or brickwork utilising epoxy or polyester resin grouts(5). The first involves inserting a deformed bar or bolt into a preformed or drilled hole into which the resin grout has been poured (Fig. 7.3). Fig. 7.3. Fixing using pourable […]

Some of the earliest major applications of adhesives in civil engineering involved the use of resins for abrasion resistant and non-slip surfaces to heavy duty floors and roads. This was achieved by the use of synthetic anti-skid grits, such as calcined bauxite, set in a resin base. Both epoxy and polyester resins have been used, […]