The article summarizes aspects of fire safety in hybrid structures using wood. It highlights the limited applicability of existing standards when combining materials with different thermal and mechanical properties and emphasizes the need for a fire engineering approach. Based on casestudies, including the Moen-Wood system from the Japanese company Takenaka, approaches such as layered structures and controlled charring are presented. The article provides an overview of current design options and identifies challenges faced by Czech design practice in the design of fire-resistant timber structures for higher buildings.

The paper deals with the numerical calculation of a steel joint at elevated temperature. The Sheffield experiment, well known and described in the literature, has been studied. The study of the shell model has been carried out using the (CBFEM). The validation of the model shows good agreement with the experiment. A summary of the sensitivity study is included in the paper.

This study explores the potential of a calcined kaolinite-illite clay in LC3-type binders with the aim of assessing the material’s thermal resistance. After designing and characterizing the binder compositions, simultaneous thermal analysis (STA) was used to identify critical temperature ranges of phase transformations. Three key regions were detected: 50–300 °C (dehydration), 400–500 °C (Portlandite decomposition), and 650–750 °C (CaCO₃ decarbonation). Between these, the material remained thermally stable. Based on this, 400, 600, and 1000 °C were selected as target temperatures for future heat exposure tests. The presented results form the basis for further investigation of the high-temperature behavior of this alternative cementitious system.

In 2015, the preparation of a new generation of the Eurocodes was initiated, with the implementation in Slovakia anticipated by 2028. The notable update introduced in the Eurocode 2 is a revised methodology for the design of the anchorage of reinforcing steel in concrete structures. This article presents a comparative analysis of the design approaches and the required anchorage lengths specified in the current and upcoming version of the Eurocodes 2.

This paper deals with the use recyclate as a partial or complete substitute for natural aggregates for the production of concrete. However, the current legislation in the EU and the Czech Republic allows this use only to a very limited extent. The text will describe the current situation in the Czech Republic and the directions of further development of related standards to extend the existing possibilities of using recyclates for concrete production.

The aim of the methodology is to establish a procedure for the safe use of fly ash from coal combustion in construction products. The development of this methodology was part of project no. FW01010195, titled “Advanced Manufacturing Technologies for the Strategic Utilization and Storage of By-Products of Energy Production (BEP)”. The methodology is intended to serve as a basis for decision-making regarding the handling of these materials for companies engaged in the production of construction products containing fly ash, state administration officials, the Czech Environmental Inspectorate (ČIŽP), certification bodies, regulatory authorities, and other relevant stakeholders.

This article focuses on the composition and restoration of plasters of historical buildings, carried out since the 20^th century, especially from its second half until today. The binders, admixtures, and additives used for plasters in the past are described, and the differences in their properties compared to those of current materials are discussed. The principles of plaster restoration using various methods of preparing plaster mortar mixtures are described. Attention is also paid to the types and properties of plasters for damp masonry containing water-soluble salts. Disagreeing opinions on restoration from the perspective of architectural heritage care and technologists are also discussed.

This article focuses on the composition and restoration of plasters of historical buildings, carried out since the 20^th century, especially from its second half until today. The binders, admixtures, and additives used for plasters in the past are described, and the differences in their properties compared to those of current materials are discussed. The principles of plaster restoration using various methods of preparing plaster mortar mixtures are described. Attention is also paid to the types and properties of plasters for damp masonry containing water-soluble salts. Disagreeing opinions on restoration from the perspective of architectural heritage care and technologists are also discussed.

The second and final part of the article on the design of loft extensions and superstructures in masonry buildings deals with other possibilities of increasing the load-bearing capacity of existing wooden floor structures. It also discusses the reinforcement of reinforced concrete ceilings and ceiling structures with rolled steel profiles. Finally, the possibility of increasing the clear height of the loft space and the special features of superstructures.

This paper begins the first part of a series of articles on the design of loft extensions and superstructures in masonry buildings. The first part deals with the problem of loading of floor structures and the possibilities of further action in cases where the floor structure is structurally unsuitable for the new purpose. Subsequently, the possibilities of increasing the load-bearing capacity of wooden ceilings are described. This is done by changing the structural system, inserting a new ceiling slab, and by coupling the original ceiling with an additional structure.

The fourth and last part of the series of articles on the problem of masonry buildings situated in floodplains deals with the problem of loading of buildings during the passage of a flood wave. Specifically, the calculation of the load from the vertical buoyancy of water from the flood wave, the load from the dynamic pressure and the load from the dynamic effect of a floating object.

The third part of the series of articles on the problems of masonry buildings located in flood-prone areas deals with the possibilities of rehabilitation of damp masonry partitions after the water from the flood wave has hit. Furthermore, it deals with the issue of underground structures and the flood area, which is also a submerged area. The third part concludes with an introduction to the issue of loading of buildings during the passage of a flood wave.

The second part of the first series of articles on the problems of masonry buildings located in floodplains deals with the peculiarities of historic and listed buildings. It also deals with the treatment of expansion joints, protection against water pressure and the treatment of the internal distribution of technical equipment of buildings. Last but not least, it deals with the issue of rehabilitation of buildings after a flood wave.

This paper begins the first part of a series of articles on the issue of masonry buildings located in floodplains. The first part deals with the general issue of securing existing buildings against the effects of a flood wave, as well as specific possibilities of implementing additional structural modifications to existing buildings. Both in terms of the internal layout and the possibilities of static securing of the supporting structures.

Moisture affects the strength of wood. The strength decreases with increasing humidity. Excessive moisture in wood allows the growth of wood-decay fungi. They attack the building covertly and can cause great damage before they are detected. Wood can be protected against wood-decay fungi by impregnation. Its use in residential buildings is problematic. That is why structural protection is used, i.e. incorporating the wood into the building in such a way that it does not get wet or even soaked and its natural drying out is ensured. During the lifetime of a building, timber can be threatened by high humidity in the structure, condensation, water vapour, leakage or failure of water supply systems and, for example, flooding. It is wise to measure the moisture content of timber in structures and to react in good time to excessive moisture content. Unfortunately, there are not many ways to do this. The method described in this article addresses the monitoring of moisture in timber enclosed in structures.

The paper deals with the design of recycled asphalt mixtures for the bound base layers of pavements. These mixtures are made up of almost 100% reclaimed asphalt mixture adjusted by crushing to a suitable wide fraction. Suitable binder added to the recycled asphalt mixture or heated to a low temperature or is processed by a combination of these technological procedures. The research described in the contribution follows on from the newly created standard ČSN 73 6147 “Recycling of structural layers of roads in the cold”.

This paper presents the results of an experimental investigation into fully transparent bonded joints for load-bearing glass structures. The research specifically focused on the surface properties of glass that affect the load-bearing capacity of the joints, such as surface energy, wettability, and roughness. It also discusses the differences between the tin and air sides of the glass sheets.
The findings are supported by tests conducted at the Faculty of Civil Engineering at CTU between 2021 and 2023. Tensile and dynamic tests of the selected adhesive LOCTITE^® EA 9455 as well as shear tests of single-shear glass-to-glass joints, were evaluated, with a focus on the load-bearing capacity of the joints at elevated temperatures.
The paper concludes with a summary of the results and suggests their implications for engineering practice.

The article focuses on the importance of regular inspections and maintenance of smaller steel structures, such as roof walkways, fire escape stairs, or railings, from the perspective of applicable legal regulations and technical standards. It highlights the key requirements of ČSN 73 2604 and other legislative measures that ensure the safety and long-term reliability of these structures. The text also provides practical advice on inspection procedures, inspection frequency, and inspector qualifications. This article serves as a valuable guide for property owners and professionals in occupational health and safety (OHS) and facility management.

The building industry produces more than 30% of the European Union's waste. To reduce this waste, buildings should be designed in line with the principles of the circular economy, so that the products and materials they contain can be removed and reused at the end of the building's life cycle. Therefore, a modular system has been designed, the load-bearing part of which is made up of prefabricated frames composed of plywood. To verify the actual reuse potential of the structure, an experiment was carried out in which a house was assembled and operated for one year. After dismantling the house, the reuse potential of each element was assessed. In this paper, the potential of the main elements of the system for reuse, which overall amounts to 98% by weight of materials used in the system, is described, together with the key barriers to material recovery of the dismantled elements.

The efficient classification of materials in construction debris is crucial for their sorting and further valuable utilization. Current methods, whether relying on force sorters or separators, are reaching their limitations. In many cases, construction and demolition waste materials end up being downcycled or even sent to landfills. Our contribution is divided into two parts. The first part presents facts relating to the production of construction and demolition waste in the EU and justifies the urgency of responsible waste management. It also recaps the development of indirect methods of classification and briefly describes types of suitable sensors for material observation and algorithms for data evaluation. The second part describes our classification solution, developed by the faculties of civil engineering and electrical engineering at CTU in Prague. This method is based on the evaluation of data obtained with ordinary RGB cameras.