The temperature joints formed in concrete can reduce the likelihood of deformation of the monolith due to changes in external conditions, including temperature differences and jumps in the humidity regime.
Temperature joints in a concrete monolith are a necessary component, which is due to a change in the geometric dimensions of the concrete slab after solidification at temperature and humidity differences. If such joints are not arranged in concrete, then internal stresses, deformations and cracks can occur in the monolith. These factors reduce the strength characteristics and durability of the structure. Temperature joints can evenly distribute additional loads, excluding deformation.
The temperature seam should be periodically removed from foreign objects and dust so that it can perform a protective function.
Features of the arrangement of expansion joints
It is permissible to seal the temperature joints with an elastic compound, which will protect against contamination without affecting their characteristics. Equip the seams in a timely manner. It is technologically correct to cut in a freshly laid mixture after grinding the base. If you carry out the work a little later, after hardening, cracks may form at the edges that reduce the strength of concrete.
The process of formation of seams must be carried out 12 hours after the completion of pouring. If the work was carried out at low temperatures, then cutting should be carried out after 24 hours.
Before starting work, you should calculate the depth of the seam, it should be equal to the limit 1 / 3-1 / 4 of the thickness of the concrete screed. Work must be carried out in compliance with the cutting interval. The cut mesh should be free from internal seams, as cracks initially form in places of internal corners.
The seams should not converge T-shaped. The mesh should be devoid of areas with triangular angles, this is due to the fact that initially the deformation begins at sharp angles. If the triangular shape could not be excluded, it should be made at least equilateral.
Through the formation of seams, the master creates a zone of weakness, this allows concrete to crack in this zone, and not randomly. The edges of the cracks have a certain roughness, which does not allow vertical displacements to occur until the crack becomes excessively wide.
