A study was made of the influence of a model biological environment of the products of the metabolism of filamentous fungi on the biostability of cement composites from industrial dry building mixes for outdoor and indoor work. The low resistance of samples without additional bioprotection to the influence of the biological environment was established. Relevant is the development of cement composites with biocidal additives to ensure resistance to biologically and chemically aggressive environments without reducing the strength properties. The degree of fouling of samples from various types of dry building mixtures in a model environment of metabolic products of filamentous fungi was determined. Eight composites of different composition were studied under the influence of 13 types of model medium. The stability of the samples was established at a concentration of medium components from 0 to 5% by weight. Tile adhesive "UNIS 2000", tile adhesive "Prospectors", putty "Prospectors", facade plaster "KNAUF" have fungus-resistant properties. Putty "CT29 Ceresit". Waterproofing "VodoStopGlims", plaster "IvsilGross" and self-leveling floor "Magma" are non-mushroom resistant. The most unfavorable concentrations of filamentous fungi metabolism products for the samples were revealed. The effectiveness of the use of polymer-based biocidal additives of the Teflex series (OOO SoftPROTECTOR, Russia) on the resistance of cement composites to biodegradation was revealed. The additives "Anti-Salt Wash", "For Metal" and "Universal" showed the greatest efficiency, their use provides fungi resistance and fungicidal properties of building materials.
Modern geographic information systems provide great opportunities for using a variety of data on spatial objects, searching and storing materials in a convenient form. The authors describe the experience of creating a spatial river-database of Mordovia Republic, RF in a GIS environment based on the reference manual “Hydrological knowledge”. Various approaches to solving the task were tried. The assessment of the temporal reliability of the data was carried out, since over time a number of water-bodies’ names became outdated; the river network had undergone changes due to natural reasons and under the influence of economic activity. The created database of streams of Mordovia can be used as a reference and information source.
In recent years, self-compacting concrete mixtures have been widely used. Such mixtures are characterized by high workability without the use of vibration exposure. The application of innovative technologies allows manufactoring of various materials and products for architectural and construction purposes with improved decorative properties. The paper provides the results of a study on the selection of compositions for decorative-finishing powder-activated concrete with a granular surface texture according to rheological properties, strength and frost resistance had been adopted.
The following components were adopted for the research. Egyptian white cement was used as a binder, microquartz as a microfiller, screenings of crushing granite and cooper slag of 0–0.63 mm fraction was used as a finely dispersed component, granite cuts 0.63–5.0 mm and cooper slag of 0.63–2.5 mm fraction as an aggregate sand. A new generation superplasticizer of domestic and foreign productionplasticized the mixtures. Structural and rheotechnological parameters of powder-activated concretes were calculated.
From the obtained values of the conditional rheological criteria of powder-activated concretes, it follows that all of them are much greater than unity and characterize a significant excess of the volumes of rheological matrices over the volumes of fine-grained, coarse-grained components that fit into them with large separation of particles and grains.
Strength as a complex mechanical characteristic, including a combination of strength, reliability and durability criteria, is the most important quality parameter of the concrete structure as an active and the most massive building material for structural purposes. A significant number of facilities made of concrete and reinforced concrete are being built in the southern and northern regions, characterized by extreme climatic conditions. Buildings and structures are exposed to cyclic loadings of various types and climatic influences, characterized by cyclic manifestations of negative and alternating temperatures. The research revealed high indicators of strength and frost resistance of decorative powder-activated concretes with a granular surface texture.
Abstract The interaction of the public spaces for art with the urban structure of Munich is researched on the basis of mind maps. Three architecturally-town-planning triads belonging to the three various levels were discovered. At the bottom level is the ensemble of the Königsplatz with Propylaea (the central element), Glyptothek and Staatliche Antikensammlungen. At the average level is the mega-ensemble, composed by the Academy of Fine Arts together with Siegestor (the central element), the complex of three Pinakotheks and the Haus der Kunst. At the uppermost level is the «urban triptych», composed by the historical centre of Munich (the central element), the palace and park ensemble of Nimfenburg and the Olympic park. The town-planning forecast concerning the formation of the ensemble of public spaces for art in the northeast quadrant of the city and of the mega-ensemble of public spaces for art in the southwest quadrant of Munich is made.
В статье предложены многокомпонентные порошково-активированные самоуплотняющиеся песчаные бетоны с повышенным содержанием дисперсных и тонкозернистых компонентов на основе молотых и тонкозернистых кварцевых песков, увеличивающих содержание водно-дисперсной и водно-дисперснотонкозернистой суспензионной составляющих, усиливающих действие суперпластификаторов, превращающих бетонную смесь в саморастекающуюся, самонивелирующуюся под действием собственного веса и самоуплотняющуюся за счет всплывания воздушных пузырьков.Приведены основные физико-технические свойства порошково-активированных песчаных бетонов и фибробетонов нового поколения.Рассмотрено ускорение начального твердения бетонов при введении нанометрических гидросиликатов кальция
