Abstract
Abstract The article presents the results of shear and tensile strength of deformable cement adhesives, reinforced by fiberglass mesh with a different weight in a lightweight floor system without screeds. The substrate under adhesive was EPS and XPS thermal insulation. Tests were carried out in dry, wet conditions as well as during freezing and thawing. On their basis, it can be concluded that the larger contact surface of the EPS thermal insulation with the deformable adhesive C2S1 increases the adhesive’s tensile strength. This surface is not important using C2S2 adhesives or when the substrate is made from rough insulation XPS. It was generally found that the higher weight of the fibreglass mesh in deformable cement adhesives has a more favorable effect on their shear strength. Water absorption does not significantly affect the adhesion of terracotta, and in some configurations of components in this system increases it. The adhesive with the symbol C2S2 compared to C2S1 has a higher tensile and shear strength using the same materials. Frost conditions do not allow for long-term use of this type of floor construction in snow and ice protection systems. This experimental research shows that an economical solution with optimal strength consists of XPS insulation, 205 g/m2 mesh, C2S1 adhesive.
Highlights
At the moment, the light floor system is not a commonly used solution
The absorbability of light floors does not have a major impact on their strength, and even in a moist environment, the tensile strength is increased by 20%, as noted in Figure 7, using an XPS board, the 320 g/m2 mesh, and a C2S2
Higher mesh weight generally increases the shear strength of deformable cementitious adhesives. This can be seen in figures 10 and 11 in C2S1 adhesives on EPS insulation and C2S2 on XPS insulation
Summary
The light floor system is not a commonly used solution. It is worth popularizing due to many advantages, including:. Made in 2017/2018 and described in [3, 7], tests of the mechanical light-floor system’s strength were carried out using one type of C2 TE S1 cement adhesive and mesh with 335 g/m2 weight Through this procedure, the necessary information regarding the shear and tensile stress of the commonly available cement adhesive (not modified by the mortar manufacturers), was obtained. Frost resistance tests of 5×5cm terracotta tiles attached to rough thermal insulation XPS 300, using C2S2 adhesive on fibreglass mesh, and weighing 145 and 205 g/m2, were conducted These tests were carried out after 25 and 50 cycles (3 samples each) of freezing and thawing, in accordance with the procedure described in [3]. This was done in order to initially verify the possibility of using this type of adhesive in the winter on a critical substrate, in the form of thermal insulation boards
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