The effect of failure to comply with technological and technical requirements on the condition of newly built cement mortar floors

Abstract

The article presents the results of ''in situ'' tests of two new cement mortar floors that were made defectively in an important public building with a large area. The performed results of organoleptic tests and extensive strength tests, which are helpful in determining the causes of numerous and various defects in floors, were presented. It was observed that the source of the aforementioned causes is not only the failure to comply with the technological and technical conditions and requirements for laying a cement mortar mix and the execution of floors but also the lack of appropriate supervision over the entire flooring process. The causes of defects were determined and should help to avoid similar situations in the future.

Methodology for Controlling the Technological Process of Executing Floors Made of Cement-Based Materials

“…Table 2. Sample results of strength tests carried out for one of the cement floors tested in accordance with [46] (own study based on the data provided [25]).…”

“…As shown in Figure 10, these grooves locally reduced the thickness of the Figure 9. The thickness of the floors in comparison with the designed thickness (based on the data presented in [25]).…”

“…According to the authors, the consequence of this can be seen in the very frequent cases of cement floors being executed badly, regardless of whether they are made of ready-mix cement mortars or prepared directly at the construction site [21][22][23][24]. In construction practice, there are known cases of removing defective floors and then re-executing them again [25][26][27][28][29].…”

Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

“…A layer of laitance and an increased porosity . Scheme of the pore formation after mortar bleeding, with an illustration of the lowest compressive strength in the subsurface area (according to [5]).…”

“…This could dramatically decrease the strength of the overlay in its subsurface area. Hoła et al [5] presented a study of a floor with numerous defects. The velocity of the longitudinal ultrasonic wave c L results presented in this study show that an incorrectly prepared cement mortar mix and the incorrect supervision of the flooring process increase the possibility of laitance creation, thus causing a decrease in subsurface strength.…”