Secondary raw material Fly ash Waste glass Polymer-cement composite Structure This paper focuses on possibilities of use of selected secondary raw materials for modification of developed high strength coating based on polymer-cement. The aim is achieving the same or better physical-mechanical properties of resulting material at maximal level of substitution of cement with secondary raw materials. Because of high contents of amorphous SiO2 two secondary raw materials were selected: high temperature fly ash and recycled soda-lime glass to replace cement by 20 and 40% by weight. These secondary raw materials were pre-treated in ball grinder to specific surface of the substituted Portland cement CEM I 42.5 R, 300 m 2 •kg −1 and specific surface 400 m 2 •kg −1 (±50 m 2 •kg −1). Selected test specimens were subjected to compressive strength determination after 3, 28 and 90 days. Samples of selected mix-designs were subjected to Computed Tomography to determine influence of substitution of cement with individual additions on structure of polymer-cement composite. The main finding is that suitable secondary raw materials can successfully substitute binder to the extent of 40%; in case of fly ash, the compressive strength after 28 days was higher by 10% and in case of ground glass by 12%. At the same time, positive influence of ground glass on density and integrity of the cement stone was proved. Based on the findings it can be stated that suitable secondary raw materials are capable of enhancing properties of the developed high strength coat. The main result is enhancement of basic physico-mechanical properties and at the same time achieving better structure of the coat, which is the elementary condition for high chemical resistance of cement based composite material.

This paper deals with the study and development of polymer-based adhesive with high filling ratio of secondary raw materials and waste materials. The goal of this paper is to develop adhesive mortar with the highest filling rate of secondary raw materials and waste materials as possible while preserving very high physical-mechanical properties, including flexural and compressive strength, pull-off bond strength and abrasion resistance. High-temperature fly ash, waste slag and waste packaging glass are used in this paper as fillers. The resulting mortar shows high physical-mechanical properties, including high abrasive resistance and very high bonding strength to a large variety of building materials including concrete, steel, glass, and tiles.

This paper deals with the study of chemical resistance of new cement-based grout for invert grouting. The aim of this work is to verify new mixtures with specific admixtures. The study monitors resistance to external sulphate attack. Specimens were placed into sulphate solution 29.8 g∙l-1 (44 g∙l-1 Na2SO4) according to DIN19753 standard. Based on the results gained, new mixtures will be designed and optimized by addition of suitable secondary raw materials (fly ash, waste foundry sand, waste glass, waste filers).

This paper deals with research and development of a new chemically resistant sprayed mixture based on portland cement and special admixtures. The new material will be part of a comprehensive remediation system for the remediation of chemically attacked and stressed sewer structures. The aim of this work is to verify the effect of the amount of crystalline waterproofing admixture on selected physical-mechanical characteristics and chemical resistance, specifically resistance to the attack of sulphate solution and the attack of aggressive biogenic sulfuric acid solution. Furthermore, the resulting characteristics of test specimens manufactured in the laboratory and test specimens made by spraying into boxes and subsequent cutting to the required dimensions were compared. Due to the fact that there is currently no official methodology in the Czech Republic for testing the chemical resistance of cementitious materials intended for sewage environments, the methodology was used in accordance with DIN 19573 "Draft on mortars for construction and rehabilitation sewer systems". The sulphate resistance was determined for test specimens measuring 160×40×10mm, which were exposed to a solution of sulphate salts with a concentration of 29.8g / l (44g/l Na2SO4) for 91days. To determinate the resistance to biogenic sulfuric acid, special tanks were assembled in which the test specimens, measuring 80×40×40mm, were exposed for 14 days to a solution of sulfuric acid (H2SO4) with a molar concentration of 1,0mol/l (pH=0). The results of this work show the optimal amount of crystalline waterproofing admixture. The results of this work will be used in the next phase of research, when cement and some fillers will be substituted by selected secondary raw materials, namely to improve or at least maintain the key characteristics of the final sprayed mixture. Keywords: Sprayed mixture, Sulphates, Biogenic sulfuric acid, Chemical resistance, Crystalline waterproofing admixture

Tento článek se zabývá problematikou polymerních lepicích malt. V této studii byly použity vinyl-esterové a epoxidové pryskyřice v kombinaci s křemenným plnivem. Tato práce studuje fyzikálně-mechanické vlastnosti vyvinutých malt. Pevnost v tlaku, ohybu a otěruvzdornosti. Pro každou maltu byl zjištěn maximální plnicí poměr při zachování použitelnosti zednickým způsobem (špachtlí či lžící). Výsledky ukazují, že epoxidová malta na bázi aminu vykazuje nižší fyzikálně-mechanické vlastnosti než lepicí malta na bázi vinylesteru, kromě odolnosti proti obrusu, u níž dosáhla hmota na bázi epoxidu výrazně lepších výsledků.