JOINTS IN CONCRETE

Joints in concrete

Joints in concrete

Introduction

In the last decade, engineer experts have done extensive research on the use of waste products in concrete. Such products comprises of fly ash, scrap tires, scrap metal, burnt sand casting, glass, and fibres. Each of the waste products has provided a specific effect on the properties of fresh and hardened concrete. The use of waste products in concrete is not only economic but also solves some of the problems of waste disposal. Industrial concrete floors are stacked in warehouses, logistics terminals, factories, train stations and other facilities with significant loadings on floors, and in this regard they have requirements for durability, resistance to dynamic loads and abrasion resistance, tightness in the absence of pollination, ease of operation and cleaning. However, in the device, there is also another problem, the short-lived duration. Technologies used today and integrated approach can successfully solve the problems that arise in the implementation and operation of the sexes and to achieve the required performance at reasonable financial cost. Therefore, all the issues related to joints in concrete will be discussed in detail.

Background of Concrete Structures

Standard floor usually consists of a base that has concrete screeds and coatings include a material that imparts the surface of the main consumer properties. The Concrete in the screed as any cement concrete, its structure is very fragile material that is not capable of plastic deformation. When applying to the concrete load greater than its strength characteristics, it is not deformed without breaking, as is the case with plastic or other pliable material, and crack like glass. The appearance of cracks is also under the influence of internal stresses in the concrete caused by shrinkage strain hardening and temperature variations. To limit these negative processes and maintain control of places of cracks in the concrete screed, it is necessary to cut expansion joints. There are three basic types of joints in the screed: insulation, shrinkage and structural joints (Bizindavyi, 1999, 160).

Insulating Joints

In the operation of the building of his designs are subjected to various deformations. Causes of these deformities are many: it is the impact of the environment, soil slip base and temperature effects, and work intrashop equipment if it is manufacturing, etc. In order to avoid transmission of strains from the walls and foundations on concrete floors in areas of contact with the concrete floor screed other structures of the building - walls, columns, foundations for equipment, etc., make insulation joints that allow the floor to work independently of other structural elements of the building. In addition, in the process of hardening of the concrete shrinks, i.e., decreases in volume. If the screed will have a hard grip with a fixed object, such as the foundation of the building, it will most likely crack as shrinkage cannot be compensated. Insulation makes a seam along the walls and around all the columns. If the screed is bordered by another base, such as the foundation for the equipment, then perform a seam around ...