Lenka Mészárosová

The Use of Geopolymers in Rehabilitation of Reinforced Concrete Structures

The subject of this paper is option analysis of the use of geopolymers as matrixes to repair mortars designated for rehabilitation of reinforced concrete structures. Due to their specific properties, geopolymers show a high potential mainly for special applications. Rehabilitation of reinforced concrete structures exposed to extreme conditions is a field in which it is possible to effectively take advantage of geopolymers ́ exceptional properties. In this particular case, we focus on comparing the behaviour of polymer-cement materials commonly used in the rehabilitation of reinforced concrete structures and the one of geopolymer-based mortars.

Analysis of Possibility of Using Geopolymers in Rehabilitation of Reinforced Concrete Structures

The article is focused on analysis of using geopolymers as matrixes to repair mortars designated for rehabilitation of reinforced concrete structures. Due to their specific properties, geopolymers show a high potential mainly for special applications. Rehabilitation of reinforced concrete structures exposed to extreme conditions is a field in which it is possible to effectively take advantage of geopolymers ́ exceptional properties.

Physical-Mechanical Aspects of Preparing Thermal Insulation Materials on the Basis of Liquid (Water) Glass

In the Czech Republic, liquid glass is mainly used for painting areas with higher surface temperatures, such as bonding agent of heat-resistant concretes, which require higher chemical resistance; it is also used as additional damp proofing for buildings with damp brickwork. Globally, liquid glass is used with expanded perlite as thermal insulation for higher temperature (maximum application temperature of 650 °C). This paper should outline the possible preparation of such material in our conditions and verify, whether it is possible to achieve the bulk density for such material of up to 200 kg/m3, or the potential application of such material.

Study of Effect of Higher Temperature on the Properties of a New Silicate-Based Thermal Insulation Material

This article studies the possibilities of using lightweight porous concrete, which is intended for insulation of thermally intensive equipment and the effect of its use under specific circumstances on the change of the building envelope thermal resistance. The material should combine benefits of the porous and foamed concretes produced so far (low bulk density, high thermal resistance, low production costs) with higher thermal resistance. The benefit of the new material is its ability to also perform at higher temperatures due to the selection of suitable raw materials.

Importance of Physico-Chemical Methods in Evaluating the State of Building Structures and Design of their Redevelopment

The experience in building practice proves that in assessing and evaluating the state of reinforced concrete structures, also professional companies place a clear emphasis mainly on determining the strength characteristics of concrete, assessing the rate of corrosion and the distribution of reinforcements in assessed elements. Obtaining these data is essential for the structural analysis of a structure. However, from the view of a complex evaluation of the state of structures, this information is quite insufficient, for example because of fully omitting the evaluation of the state or rate of degradation of concrete by action of chemically aggressive substances from the outside environment. For example, it is not possible to predict further life of a structure in a relevant manner on the basis of facts only found out by testing the strength characteristics of concrete.

Amelioration of the Porosity in Silicate Based Materials

This article deals with the application of lightweight concretes for thermal insulation purposes. The main aim is to increase their porosity, which is closely related to the thermal resistance of the substance. By selecting appropriate raw materials, we try to eliminate this imperfection and propose a material that would generate sufficient resistance to heat transfer to allow the reduction of costs associated with the insulated equipment operation, while preserving the heat resistance of such materials. The article outlines the designing of such material, its potential applications, advantages over existing materials, and some basic properties.

Possible Substitutes of Epoxy Screed Filler with Secondary Raw Materials

Defects occurring in constructi ons go hand in hand with the need to prevent such defects. For this reason, there is a need to develop new preservative products. One of the availa ble alternatives for protecting floor surfaces is the use of epoxy screed s. This article deals with the development of a new epoxy screed that would utilize secondary raw materials as fi llers. The use of secondary raw materials is a very current issue, as their use cont ributes to resolving problems associated with their disposal.

Analysis of the Possibility of Using Geopolymers as a Matrix in Sprayed Concretes Used under Extreme Conditions

The article analyses the possibility of using geopolymers as a matrix of sprayed concretes intended for realisation of constructions in the environment with an increased fire risk. Thanks to their specific properties, geopolymers show a high resistance to extreme temperatures. Thus, using geopolymers as a matrix shows a considerable potential in the light of development of sprayed concretes resistant to high temperatures.