Jana Hodná

Utilization of Waste Glass in Polymer Concrete

Glass waste is currently produced almost in all developed countries. It is the silicate based waste material which after suitable treatment has found application in many industries and therefore some types of waste glass belong to progressive secondary raw materials. However, the use of this silicate waste material which differ on the basis of an initial use of the glass in its physical and mechanical properties has not been fully explored in the field of building industry – the production of building materials. The replacement of the common filler – quartz sand in the polymer concrete (PC) could be one of the effective possibilities of the utilization of different type of waste glass in the building industry. Mainly for this reason, this work deals with the experimental examining the possibility of using various types of waste glass in the polymer concrete based on epoxy resin.

Antibacterial Properties, Shore Hardness and Chemical Resistance of Epoxy Coatings Containing Finely Ground Secondary Raw Materials for Hygienic Plants

Currently fillers for antibacterial layers in hygienic operations are mainly primary raw materials, whose properties are verified and well-known due to their long-term use. However, the use of proper secondary raw materials appears to be a good option from an environmental and economic point of view. This work assesses the possible adverse effects of specially treated secondary raw materials in relation to antibacterial properties, chemical resistance and Shore hardness of the antibacterial coating on an epoxy base (AC-E) providing no physiological damage. This coating reliably eliminates the widest possible range of bacteria and yeasts, has sustained effectiveness, consistent functionality over time, provides permanent protection and is suitable for use in healthcare facilities and food processing plants. Two kinds of transparent waste glass (NaSX, VLG) and two types of waste foundry sand (FSC, FSB) were tested, and all fillers were treated so that particle size was below 0.063 mm, including the reference filler (Dorsilit sand). On the basis of antibacterial resistance tests, Shore hardness and chemical resistance, it was assessed that the tested fillers may be effectively used for antibacterial coatings while maintaining the properties of the reference coating. Within the rapid testing of chemical resistance, the surface microstructure of the antibacterial coating was also examined after long-term exposure to aggressive organic and inorganic liquid media. When adding 30% and 35% of the selected waste fillers, the hardness and chemical resistance of the cured coating did not change. The treated waste fillers tested had no negative impact on the antibacterial properties of the coating and were judged to be appropriate fillers in place of Dorsilit silica sand or glass flakes.

Molar Ratio and Polymer Modification Influence to Water Glass Coatings Matrix Basic Properties

This paper contains the continuation of basic research from 2012 - the molar ratio influence to water glass coatings basic properties (adhesion, diffusion properties, surface quality) was expanded with basic resistance (combination of sun, UV light and rain). Most silicate coatings for concrete protection are currently based on potassium water glass. Water glass matrix itself is, however, insufficient for coatings matrix and often is modified by polymer substances for the coating purpose. Combinations of water glass basic matrix (Sodium, Potassium, Lithium, Sodium - Lithium and Potassium - Lithium) with the appropriate polymer modifiers is also content of the presented paper. Polymer dispersions modification effect to basic properties and resistance to developed silicate coating binder is also part of paper.

Experimental Verification of Scrub and Impact Resistance of the Epoxy Coatings Filled with the Finely Milled Waste Glass

The main aim of the research is to examine the possibility to replace the primary materials, glass flakes and mildly ground siliceous sand that are the most commonly used fillers in majority polymer coatings today, with special types of finely milled waste glass. During the experimental testing, carried out for the purpose of the research into the chosen progressive polymer protective materials (protective coating premium (PC-P) with higher long-term durability, protective coating economy (PC-E) and floor coating economy (FC-E)), some mechanical attributes of the developing epoxy coatings were tested. Impact resistance and scrub resistance are tested with the developing epoxy coatings containing secondary raw materials. These tests dealing with mechanical resistance and they are two of the most testing attributes of the epoxy polymer coatings. Based on the evaluation of the test results of performed tests the possibility of replacing the commonly used fillers by special types of finely milled waste glass is assessed.

Examination of Mechanical Properties and Temperature Resistance of Epoxy Coatings Filled with Secondary Raw Materials

Epoxy coatings are used mainly in the construction especially where it is necessary to increase the resistance of concrete floors against mechanical wear, to increase chemical resistance, to prevent dusting and to ensure hygienically clean environment. Epoxy coating is a composite material that consists of epoxy resin cured mainly by polyamine hardener and filler. As a filler is currently used pure silica sand Dorsilit ground to below 0.063 mm and for more demanding applications fine glass flakes with a high proportion of SiO2. The aim of this work is to experimentally examine the possibility of using secondary raw materials as fillers into three types of polymer epoxy coatings, where it seems the most appropriate utilization is waste glass with a high content of SiO2. Based on the evaluation of the test results of tensile properties, Shore hardness and temperature resistance the possibility of replacing the commonly used filler by finely ground waste glass is assessed.