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When making and repairing concrete floors it is vital to properly prepare the interlayer bonding surface. The measure of the bond is the value of pull-off adhesion f b experimentally determined in building practice by the semi-destructive (SDT) pull-off method. In this paper it is proposed to assess pull-off adhesion by jointly the optical laser triangulation method and the acoustic impulse response method, using artificial neural networks (ANN), on the basis of a few parameters (independent of top layer thickness) determined by these methods. The proposed non-destructive (NDT) pull-off adhesion assessment method is devoid of the drawbacks and inconveniences of the pull-off method and makes possible the reliable mapping of the adhesion level on the tested surface without local damage to the latter. [ABSTRACT FROM AUTHOR]

This paper presents a new nondestructive way of identifying the values of pull-off adhesion between the concrete layers in concrete floors. It based on the roughness parameters of the base layer surface, using the nondestructive optical technique, and on the floor surface, using the nondestructive acoustic techniques and employing artificial neural networks (ANNs) for this purpose. The new way has a potential for being widely used in practice, whereby it may become possible to employ previously trained ANNs to identify the pull-off adhesion, without impairing the surface of the tested concrete floor. [ABSTRACT FROM AUTHOR]

• The failure of floors made of polyurethane-cement composites was presented. • The reason that led to the failure was improper use of the floor. • The forklift drive wheels allowed to spin pallets in order to deliver them. • The consequence of spinning was the rapid local increase in floor temperature. • The increased temperature caused a thermal shock to which the floor was not resistant. The article presents the results of microstructural and mechanical testing of a floor made of polyurethane-cement composite significantly damaged after short-term use. The floor is located in a large-scale production and warehouse building. There was a lot of damage, including local abrasions, roughness, burns, and burning of the floor, which all threaten the safety of its use. Based on the carried out tests, errors in the execution of the tested floor were excluded and it was shown that the technology of its execution was correct. It was demonstrated, on the basis of research, that the reason that led to the damage was the improper use of the floor. This improper use consisted of allowing forklift drive wheels to spin pallets in order to deliver them with goods when adding or picking pallets to or from the pallet stack. The consequence of spinning was the rapid local increase in floor temperature, which caused a thermal shock to which the floor was not resistant. [ABSTRACT FROM AUTHOR]

The article presents original complex methodology for the effective control of the entire process of executing floors made of cement-based materials. This methodology has been lacking in literature so far. The methodology was developed on the basis of many years of the authors' experience, which was acquired when diagnosing the technical condition of such floors. The methodology was preceded by a synthetic summary of the most important technological and technical requirements for floors made of cement-based materials. It was also enriched with a discussion of the problem documented by sample research results showing the state that may be the result of disregarding and not performing the necessary control activities. [ABSTRACT FROM AUTHOR]