Rheological properties of sewage sludge ash ceramic masses

Industrial wastes are widely involved in the building ceramic production. Sewage sludge ashes are promising secondary sources for building ceramics production. However, sewage sludge ash application for building ceramic materials production is limited by unsatisfactory molding properties. According to modern concepts, coagulation structure formation processes can be controlled by adjusting ceramic mass compositions by highly dispersed modifying additives. In this study, the drinking water treatment sludge filtrate generated in pumping and filtering stations was used as a highly dispersed additive. The purpose of study was to assess the drinking water treatment sludge filtrate effect on rheological properties of ash-clay molding mixtures. Using the photo sedimentation analysis, X-ray phase analysis, calorimeter method and parallel-shifting plate plastometry the drinking water treatment sludge filtrate additive effect on rheological properties of ash-clay mixtures was established. It was found that ash-clay mixture modification with the drinking water treatment sludge filtrate promotes a slow elastic deformations percentage increase from 3-17% to 7-34%. Apparently, this is due to the drinking water treatment sludge filtrate highly dispersed particles adsorption on coarse ash and clay particles that promotes the growth of their hydrophilic properties. Ash-clay mixtures molding properties improvement makes it possible to increase the ceramic blanks density.

Inspiration from the History of Chinese and Hungarian Building Ceramics Manufacturing Technology to Industrial Smoke Control

Chinese and Hungarian architectural ceramics manufacturing technology is of the same origin, and both have certain influence in the world. In particular, Zsolnay, a Hungarian architectural ceramics brand, has made breakthroughs and innovations in the production process of products in the inheritance of more than 100 years, forming a unique architectural ceramics manufacturing technology. It can effectively reduce the concentration of flue gas particulate matter and sulfur dioxide produced in production. The historical experience of the development of building ceramic manufacturing technology in China and Hungary is of enlightenment to the current industrial smoke control.

The problem of ubication of the Vellanis, Vindenae road stop and Ad Fines on the Lisus-Naisus road (Upper Moesia)

The paper presents data on the problem of ubication of the Vellanis, Vindenae road stop and Ad Fines on the Lisus-Naisus Roman road (Upper Moesia). The Lisus-Naisus road intersected modern-day Kosovo and Metohija from southwest to northeast. Being the main road, it connected coastal areas to the inland. A modest number of milestones was found at certain points along the road. They are of highly significant historic value due to the fact that they respresent firsthand evidence on the existence of the Roman road in Kosovo and Metohija. There are various opinions about the ubication of the aforementioned road stops in modern historiography. Ptolemaeus mentiones a settlement Vellanis after the Vicianum road stop on the Lisus-Naisus road, but he does not categorize it as the road stop. According to some researchers, Vellanis is identical to the Vicianum stop in Tabula Peutingeriana. We believe that the name of Vellanis mentioned by Ptolemaeus and Ravenna geographer conceals the name of the Vicianum road stop from Tabula Peutingeriana. In regards to the ubication of the Vindenae road stop in the modern scientific research, the prevailing opinion is based on Tabula Peutingeriana as well as the remains of the Roman settlement and necropolis (a monumental building, ceramic dishes, glass, nails, jewellery, money). It is believed that the Vindenae road stop should be looked for near Podujevo, in the area of Glavnik village (Poljanice). Taking Tabula Peutingeriana into consideration as well as the results of modern studies, the Ad Fines road stop should be looked for at the mouth of the Kosanica into the Banjska River, near modern-day Kuršumlija. Various opinions will most certainly exist as long as the assumptions continue to be based on analyses of written historical sources, without systematic archeological excavations and research. What we can say with certainity is that life evolved continously in this area (Upper Moesia), starting from the ancient times till modern days and archeological findings from these sites prove that.

Ceramic Fragments with Christian Graffiti from Mediaeval Burials in the Crimea

The thirteenth and fourteenth century Christian burials in the the south-western Crimea and Sudak contained the fragments of wheel-made vessels and building ceramic ware showing the graffiti drawn on baked clay in the form of a simple cross (type 1), a cross with two-line formula “IC XC NIKA” (type 2) inscribed between the arms, or the formula “IC XC NIKA” written in one line (type 3). These graffiti were applied to ceramic shards specifically for burials; the finds of this kind are not known in cultural layers of the settlements. The graffiti of type 1 replaced underwear crosses worn during the human’s life and served as apotropaic amulets for the dead. In the graves, they were placed under the lower jaw, at the neck or head of the deceased person. The formula “IC XC NIKA” is a partially abbreviated form of the Greek “Ἰησοῦς Χριστòς νίκα” (“Jesus Christ, conquer”) or “ Ἰησοῦς Χριστòς νίκᾷ” (“Jesus Christ conquers”). It is accepted that this formula first appeared in 720 on the coins of Leo III and his son Constantine IV and proclaimed the victory of the Byzantines over the Arabs under the protection of Christ and His Cross. Later on, imperial connotations of triumph and victory gave way to a more modest prayer for help and protection from the forces of evil. In the Crimea, the formula “IC XC NIKA” occurred from the late eighth century in building inscriptions, on architectural details, tombstones, and individual worship objects. From the thirteenth century on, the formula “IC XC NIKA” combined with a cross or independently appeared in burials: on slabs placed vertically at the eastern end of the grave so that the face of the deceased was turned to the image, or on ceramic shards that covered the mouth or neck of the deceased. The artefacts featuring this image were placed mainly in the burials of untimely departed persons: children, teenagers, or those who suffered from serious illnesses during their lifetime. The rite of placing ceramic fragments with Christian graffiti into burials for protection and scaring away evil spirits is documented in the Crimea in the thirteenth and fourteenth centuries, though in Byzantium it appeared from the tenth century on.

NON-PLASTIC RAW MATERIALS FOR THE PRODUCTION OF CONSTRUCTION CERAMICS

research by some scientists shows that the most expensive element in the manufacture of construction ceramics are clay materials, in particular kaolins. They allow getting products with high strength, but at the same time increase significantly the mass refractoriness. In this connection, a significant amount of melt is added or the firing temperature is increased. Of course, this leads to an increase in the cost of products. In Russia, the reserves of these raw materials are insufficient and it is advisable to look for new non-traditional types of raw materials. There is a need to adjust the component composition of ceramic masses and use non-plastic raw materials. An example is natural wollastonites or their analogues in the form of diopside, which are a little-used type of mineral raw material. In the Siberian region, there are several deposits of non-plastic varieties of raw materials for the production of fired construction products. The most famous are the deposits of the Slyudyansky and Sayan districts. The authors present the results of analysis of diopside rocks, where the chemical, mineral compositions and behavior of samples under heating are studied. The absence of alkali and alkaline earth metal oxides in diopsides was determined. The content of iron oxide in the amount of 0.1% indicates the purity of the raw material. More than half of the composition is occupied by silica, which is 53% and 58% in the rocks of the Burutuysky and Sayan deposits, respectively. The basis of the mineral composition of the samples is diopside, with the presence of quartz, calcite, mica and magnesium carbonate. This range of minerals is traditional in many charges of ceramic materials. Therefore, the possibility of using diopside rocks in the production of building ceramic materials is quite high.

Effect of adhesive interlayers on protective performance of bio-inspired building ceramic covering

The brick-and-mortar microstructure of nacre is usually considered as a source of inspiration for the development of strong and tough artificial materials. In this article, a nacre-inspired layered-and-staggered structural building ceramic protective covering was fabricated, and the effect of four types of adhesive materials on the ballistic performance of the protective covering was investigated through the ballistic test. The experimental results showed that under the impact of the 7.62-mm ordinary rifle bullet at a speed of 790–820 m/s, the average crater diameter in the concrete targets with protective covering was reduced by 40%–72%, and the penetration depth in the concrete was reduced by 70%–100%, compared with those of unprotected concrete targets. For the concrete targets with protective covering, that adopting the silicone sealant interlayers exhibited a smaller crater area but a maximum penetration depth, while that adopting the epoxy adhesive interlayers showed a larger crater area but a minimum penetration depth. Since the targets with the low-cost polyurethane sealant interlayers presented the smallest crater area and the shallower penetration depth, it can be concluded that the concrete with the protective covering using polyurethane sealant interlayers showed the better projectile impact resistance.

Analysis on Standardization of Building Ceramic Raw Material Based on Manufacturability

Building ceramic consume a lot of mineral raw materials. The standardization of raw materials is the trend of ceramic industry. This paper analyzes the manufacturability of clay, quartz and feldspar, and their function in the ceramic production process, aims to provide some thoughts for the realization of raw material standardization, promotes the standardization of raw materials forward, improves the utilization rate of mineral raw materials and reduces environmental damage.

Influence of Different Joints on Moisture Transport in Building Walls - A Brief Review

The phenomena of transport in porous media arises in many diverse fields of science and engineering, ranging from agricultural, biomedical, building, ceramic, chemical, and petroleum engineering to food and soil science. Several authors provide an extensive description of the problems involving porous media. For building engineering, obtaining a good understanding of moisture transport in building envelopes is becoming one of the most important tasks. In the last few decades, many studies investigating moisture transport in building envelopes have been published, which have helped to improve overall building envelope design. This work presents a brief review of these studies.