scholarly journals Valorization of granite micronized stones wastes for eco-friendly production of fired clay bricks

2021 ◽  
Vol 3 (11) ◽  
Author(s):  
Blasius Ngayakamo ◽  
Gbetoglo Charles Komadja ◽  
Abdulhakeem Bello ◽  
Azikiwe Peter Onwualu
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Research Work ◽  
Fine Powder ◽  
Value Added ◽  
Engineering Properties ◽  
Chemical Compositions ◽  
Clay Bricks ◽  
Granite Powder

AbstractConstruction and mining industries around the globe have been criticized for production of enormous solid wastes that have potential environmental impacts. Therefore, this study presents a feasible approach to recover and utilize granite micronized stones waste for production of eco-friendly bricks. This research work, aimed at substituting a natural clay with granite powder to produce value-added bricks with pronounced physical–mechanical properties. The micronized granite waste stones were crushed and ground to obtain a fine powder sample. Thereafter, different batch compositions containing a varied proportions of granite powder were prepared and fired at different sintering temperatures: 900, 1000 and 1100 °C. The raw materials and bricks were characterized for their chemical compositions, microstructural, mineralogical and physical–mechanical properties. The results showed that, an increase in granite waste powder and sintering temperature enhanced the quality of fired clay bricks in terms of mechanical strength and decreased simultaneously the apparent porosity and water absorption. The final experimental approach showed that, the possibility to produce eco-friendly bricks containing up to 30 wt% of granite powder with enhanced engineering properties fired at 1100 °C is promising. Graphic abstract

Utilization of open pit burned household waste ash – a feasibility study in Dhaka

2014 ◽  
Vol 32 (5) ◽  
pp. 397-405
Author(s):  
Md. Obaidul Haque ◽  
Ahmed Sharif
Keyword(s):  
Room Temperature ◽  
Raw Materials ◽  
Bottom Ash ◽  
Open Pit ◽  
Household Waste ◽  
Chemical Compositions ◽  
Muffle Furnace ◽  
Clay Bricks ◽  
Peripheral Area

Informal incineration or open pit burning of waste materials is a common practice in the peripheral area of Dhaka, one of the fastest growing mega-cities in the world. This study deals with the effect of open pit burned (i.e. open burned) household waste bottom ash on fired clay bricks. Between 0 to 50% (by weight) of open pit burned household waste bottom ash was mixed with clay to make bricks. The molded specimens were air-dried at room temperature for 24 h and then oven dried at 100 °C for another 24 h to remove the water. The raw bricks were fired in a muffle furnace to a designated temperature (800, 900 and 1000 °C, respectively). The firing behaviour (mechanical strength, water absorption and shrinkage) was determined. The microstructures, phase compositions and leachates were evaluated for bricks manufactured at different firing temperatures. These results demonstrate that open pit burned ash can be recycled in clay bricks. This study also presents physical observations of the incinerated ash particles and determination of the chemical compositions of the raw materials by wet analysis. Open pit burned ash can be introduced easily into bricks up to 20% wt. The concentrations of hazardous components in the leachates were below the standard threshold for inert waste category landfill and their environmental risk during their use-life step can be considered negligible.

scholarly journals RESEARCH INTO MECHANICAL PROPERTIES OF MINCED MEAT AND FINISHED PRODUCTS

2017 ◽  
Vol 4 ◽  
pp. 43-51
Author(s):  
Yuriy Suсhenko ◽  
Vladislav Suсhenko ◽  
Mikhail Mushtruk ◽  
Vladimir Vasyliv ◽  
Yuriy Boyko
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Meat Products ◽  
Tissue Fluid ◽  
Strained State ◽  
Inorganic Substances ◽  
Minced Meat ◽  
Cutting Mechanisms

Studies were conducted of the stressed-strained state of biopolymers of meat, which were exposed to the processes of elastic, residual and highly elastic deformation at cutting and mincing. Analysis of the structure of this natural biopolymer and the evaluation of mechanical characteristics of meat under normal and low temperatures are important factors that are taken into account for the rational selection of meat mincing machines and tools in the production of meat products, minced meat, semi-finished and sausage products. The structure of meat is a system of structured protein fibers, impregnated with tissue fluid, which is protein sol that contains organic and inorganic substances, soluble in it. The tissues that the meat is composed of belong to natural biopolymers, so conducting analytical studies into mechanical properties of meat within the framework of our understanding of the mechanics of polymers will make it possible to improve mincing processes, employed during manufacturing of meat products. In order to prevent meat overheating, the mincing process is performed at several stages. For example, in cutting mechanisms of choppers, they use a row of knives and grids with holes, diameter of which gradually changes from the original size of0.06 mto 0.003-0.002 min the outlet grids. Quality indicators of the finished products are affected by mechanical characteristics of raw materials and the way the cutting process is carried out. In the course of conducted analysis it was found that in modern food production there remain unresolved important problems, which address current issues, related to rheological and structural mechanical properties of meat raw material. First of all, it concerns theoretical and practical developments that enhance an understanding of physico-chemical and mechanical properties of raw materials, which will make it possible to develop theoretical foundations and experimentally substantiate the new conceptual approach to solving the task of improving the quality of semi-finished products and durability of equipment at meat processing enterprises of APC. The research is the basis for constructive and technological solutions, choice of mode, kinematic and dynamic parameters of cutting devices, steel and wear resistant coatings for cutting tools that provide saving of energy and materials at meat mincing, high quality of minced meat. and finished products and appropriate service life of the equipment. It was established that in order to determine characteristics of the strained state of meat, it is necessary to apply a circular diagram of loading-unloading, which allows analysis of behavior of the sample in a closed cycle of changing in external load. An analysis indicates a very large dependence of meat elasticity module on temperature. Dependences of this kind are generally characteristic of polymer bodies.

scholarly journals Research into special technological effects for formation of wear resistant coatings using mineral raw materials of the far eastern region

2018 ◽  
Vol 56 ◽  
pp. 03027
Author(s):  
Viktor Makienko ◽  
Igor Romanov ◽  
Pavel Sokolov ◽  
Alexander Atenyaev ◽  
Dmitry Pervakov
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Experimental Studies ◽  
Eastern Region ◽  
Mineral Raw Materials ◽  
Wear Resistant Coatings ◽  
Thermal Fields ◽  
Additional Influence ◽  
Far Eastern

The results of the study of the possibility of using additional technological influence in the formation of doped coatings are presented. The distribution of thermal fields has been calculated, which makes it possible to estimate and predict the influence of additional influence on the formation of the coating in a simplified manner. Experimental studies have shown that additional technological influence promotes mixing of the melt, leading to an increase in the transition of alloying elements, as well as an increase in the mechanical properties and quality of the weld metal.

High Quality TMCP Production and Metallurgy of Niobium Bearing Steels

2016 ◽  
Vol 879 ◽  
pp. 820-825
Author(s):  
Steven G. Jansto
Keyword(s):  
Mechanical Properties ◽  
Continuous Casting ◽  
High Strength Steels ◽  
Value Added ◽  
Bearing Steel ◽  
Carbon Equivalent ◽  
Chemical Compositions ◽  
Market Demand ◽  
Production Scale ◽  
Lower Carbon

The technological and metallurgical advancements of value-added niobium (Nb) microalloyed thermo-mechanical controlled process (TMCP) plate steels continue to be developed for more demanding end user requirements. The market demand for reduced fuel consumption and CO2 emissions in the automotive and construction sectors have further increased the demand for these new and advanced higher quality Nb-bearing steel grades. Often, the transition from laboratory melted and TMCP hot rolled heats to the production scale requires some continuous casting, thermal and mechanical metallurgy adjustments from the laboratory results in order to accomplish proper industrial continuous casting and hot rolling processes. These advanced high strength steels are microalloyed with Nb, Mo and/or other elements which affect the austenite-ferrite transformation. Niobium enables achievement of substantial grain refinement when the plate is rolled with the proper reduction and thermal schedule. The effects of these microalloying elements on the continuous cooling transformation behavior must be carefully controlled during the reheating and rolling process to successfully achieve the desired mechanical properties. TMCP applications have been successfully developed in numerous product sectors with thickness exceeding 120 mm. Since the very fine grained microstructure improves toughness and increases the yield strength, this TMCP process enables the required tensile properties with the growing trend to leaner chemical composition designs (less than 0.10%C) and excellent toughness properties. The consequence of leaner chemical compositions, especially lower carbon content and lower carbon equivalent enhances mechanical properties, fabrication and weldability.

scholarly journals STRATEGI PENGEMBANGAN INDUSTRI PENGOLAHAN KOMODITAS RUMPUT LAUT E. COTONII UNTUK PENINGKATAN NILAI TAMBAH DI SENTRA KAWASAN INDUSTRIALISASI

2015 ◽  
Vol 5 (1) ◽  
pp. 27 ◽  
Author(s):  
Hikmah Hikmah
Keyword(s):  
Human Resources ◽  
Potential Distribution ◽  
Raw Materials ◽  
Central Area ◽  
Value Added ◽  
Added Value ◽  
Exchange Potential ◽  
Seaweed Production ◽  
Seaweed Industry

Tulisan ini bertujuan untuk mengkaji tentang potensi dan peluang, p ermasalahan sertapengembagan industri rumput laut. Rumput laut merupakan salah satu komoditas perikanan budidayayang mampu meningkatkan perekonomian masyarakat, menyerap tenaga kerja dan meningkatkandevisa negara. Potensi sebaran rumput laut di Indonesia sangat luas baik yang tumbuh secara alamimaupun yang dibudidayakan di laut. Peluang menuju pengembagan Industri rumput laut masih terbuka dilihat dari potensi lahan budidaya, ketersediaan bahan baku, maupun dari sisi permintaan produk olahan.Permasalahan dan tantangan terkait kemampuan Indonesia dalam mengekspor dan bersaing dalamperebutan pangsa pasar dunia untuk pemenuhan kebutuhan rumput laut dunia antara lain rendahnyakualitas dan kontinuitas bahan baku, permodalan, lemahnya sumberdaya manusia dan kelembagaan,serta permasalahan pemasaran produk rumput laut. Strategi kebijakan pengembangan industripengolahan rumput laut E. cotonii untuk peningkatan nilai tambah adalah peningkatan produktivitas dankualitas rumput laut, pengembangan industri pengolahan rumput laut setengah jadi (ATC,SRC dan RC)secara bertahap di sentra kawasan produksi rumput laut, dan pengembangan skala usaha pengolahanrumput laut siap konsumsi dari skala tradisoinal menjadi skala industri.Title: Strategy of Commudity Precessing Industry DepelopmentE. cottonii Seaweed to Increasing Value Added in The AreaCenter of IndustrializationThis paper aims to assess the potential and opportunities, problems and developing a seaweedindustry. Seaweed is one aquaculture commodity that is able to improve the economy, provide employmentand increase foreign exchange. Potential distribution of seaweed in Indonesia is very wide both naturallygrown and cultivated in the sea. Opportunities towards developing a seaweed industry is still open inview of the potential for the cultivation of land, availability of raw materials and processed productsfrom the demand side. Problems and challenges related to Indonesia’s ability to export and compete inthe race for market share to meet the needs of the world’s seaweed were low quality and continuity ofraw materials, capital, human resources and institutional weaknesses, as well as marketing problemsseaweed products. Strategy of commudities E. cotonii seaweed processing industry to developmentincrease the added value is increased productivity and quality of seaweed, seaweed processing industrydevelopment of semi-finished (ATC, SRC and RC) gradually in the central area of seaweed production,and the development of business scale processing of seaweed ready for consumption on the scaletradisoinal be scale industries.

scholarly journals LOW-MELTING UNFRITTED GLAZE IN THE MATERIALS SYSTEM "QUARTZ SAND-ULEXIT-SODA-FELVESPATCH CONCENTRATE

2021 ◽  
Vol 6 (9) ◽  
pp. 87-96
Author(s):  
V. Onishchuk ◽  
S. Ageeva ◽  
E. Doroganov
Keyword(s):  
Chemical Composition ◽  
Quartz Sand ◽  
Raw Materials ◽  
Glassy State ◽  
Chemical Properties ◽  
Chemical Compositions ◽  
Fundamental Possibility ◽  
Feldspar Concentrate ◽  
Optimal Values

The article presents the results of studies aimed at establishing the possibility of obtaining low-melting nephritized glazes for majolica with a glass transition temperature of not more than 1000 ° C in the system of materials "quartz sand - ulexite - soda - feldspar concentrate". A rational choice of raw materials will ensure the production of slips that are able to maintain their design chemical composition during the application of majolica to the shard, therefore, provide the specified chemical composition of the glaze and contribute to obtaining the required physical, mechanical and chemical properties of the glaze layer. The design of the material compositions of the charges and the chemical compositions of the glaze coatings was carried out using the mathematical planning of the experiment, which significantly reduced the time and material costs for research. The parameters that determine the quality of slips and glaze coatings have been established, their most optimal values have been identified, which ensure the production of acceptable glaze coatings, and the ways to optimize work in the studied direction have been determined. As a result, the fundamental possibility of obtaining low-melting nephritized glazes in the system of materials "quartz sand - ulexite - soda - feldspar concentrate, capable of transforming into a glassy state at temperatures not exceeding 1000 ºC, has been proved.

scholarly journals DIGTYARI WEAVING PROFESSIONAL SCHOOL IN 1926-1929

2020 ◽  
pp. 5-20
Author(s):  
A. L Shcherban
Keyword(s):  
General Education ◽  
Raw Materials ◽  
Educational Institution ◽  
Research Work ◽  
Educational Process ◽  
Professional School ◽  
Educational Institutions ◽  
Teaching Staff ◽  
Material Base

For the first time, the activity of the weaving vocational school in the village Digtyari (modern Chernihiv region) is analyzed. It was the leading educational institution of the middle level of vocational education of the Ukrainian SSR in the second half of the 1920s, in which the creators of traditional textiles studied. The students learned the skills of making carpets, embroidered shirts, and kerchiefs. On the basis of archival sources, the histories, educational process, composition of the teaching and student groups of the school during 1926-1929 are covered. Established in the fall of 1926, the institution was to train qualified master practitioners for the factory and handicraft arts industry, who had formed an artistic taste. The teaching staff initially consisted of local general education teachers and visiting instructors and teachers of special subjects (O. Reisfeld and M. Dyachenko). The institution was headed by uneducated communists Yu. Kozelev and S. Lutayenko. The students of the first set were mostly non-locals, orphans. But the second set already consisted mostly of children of local peasants and artisans. The school had a significant material base, which remained from the textile educational institutions that operated in Digtyary during the first quarter of the twentieth century. The main rooms were located on the right-wing of the main building of the palace complex of the Galagan estate. As a result of the study of the materials of the minutes of the meetings of the school council, the conflict situations that constantly arose between the managers and their supporters and visiting specialists and led to the departure of the latter from Digtyary were analyzed. The initial stage of the existence of the Digtyari weaving professional school, problems in relations between staff, and the originality of the contingent of the first set of students influenced the quality of their training. As it is clear from the available sources, during the first and the beginning of the second school year students worked both theoretically and practically, but due to lack of raw materials they could not produce a significant amount of full-fledged products. The school’s workshop worked on “factory” and, in part, “peasant” raw materials. At the end of the second year of study, students were already making work suitable for sale. The school operated in two directions. The visiting instructor, an experienced artist M. Dyachenko brought a new vision of teaching graphic literacy into the educational process. Weaving and embroidery instructors who either graduated from the textile schools previously existing in Digtyary (A. Reisfeld, V. Nikolskaya) or worked there for a long time (G. Tsybuleva) broadcast local traditions. During the years under study, about 100 students studying at the institution, and one graduation took place. Troubles in the personal relationship between teachers and school management and insufficient funding have affected the quality of education. But even in such conditions, students not only mastered special and general education subjects but also participated in exhibitions, made marketable products, engaged in research work. Curricula developed by M. Dyachenko and O. Reisfeld became a model for other craft educational institutions. And the textbook was written by O. Reisfeld - the first Ukrainian-language textbook on the technology of folk weaving. Keywords: Digtyari weaving professional school, Mykhaylo Dyachenko, Pryluky region.

scholarly journals Prediction of weldment mechanical properties in GMAW with robot-assisted using fuzzy logic systems

2021 ◽  
Author(s):  
P. Devendran ◽  
P. Ashoka Varthanan
Keyword(s):  
Mechanical Properties ◽  
Membership Function ◽  
Orthogonal Array ◽  
Fuzzy System ◽  
Research Work ◽  
Welding Process ◽  
Rule Base ◽  
Inference System ◽  
Material Characteristics

Abstract Welding operation decides the quality of product standards in all metal work products like automobiles, aerospace vehicles, and many more. The quality of the welding process is more reliable by automating the process with robots. In this research work, the GMAW operation is automated with the “Fanuc Robot Arc mate 100iC/12” robot. The material characteristics such as ultimate tensile strength, hardness, and impact strength of weldments are predicted using a fuzzy system using triangular membership function (TrMF) and trapezoidal membership function (TMF). The simulated results are validated by comparing with experimental work, the experiments are designed using orthogonal array L18, and material characteristics are studied using fractography test. The fuzzy system is trained with experimental results using the IF-Then rule base with the help of the L18 orthogonal array. The inference system has predicted the accuracy rate of weldment mechanical properties, showing a lower error rate.

Dispersing the Charge as a Way to Improve the Quality of Ceramic Bricks

2018 ◽  
Vol 931 ◽  
pp. 558-563 ◽  
Author(s):  
Viktoriya A. Guryeva ◽  
Viktor V. Dubineckij ◽  
Aleksandr V. Doroshin
Keyword(s):  
Mechanical Properties ◽  
Original Composition ◽  
Water Absorption ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Dust Particles ◽  
Drill Cuttings ◽  
Additional Processing ◽  
Grinding Time

Investigations of the influence of dispersion of feedstock on the basis of clay of the Buguruslan deposit and drill cuttings from the facilities of PJSC «Orenburgneft» have been carried out, it is revealed that as the grinding time increases, the content of clay and dust particles increases. Intensive sintering of the samples between 1000 °C and 1100 °C has been established, which is confirmed by the compaction of the samples and the decrease in the water absorption of the ceramic masses. Minimal water absorption, within 2.35%, showed a sample of 3-hour grinding, and a sample of a 2-hour grinding of 8.34%. As a result of the study of dispersion of the charge on the basis of clay raw materials and drill cuttings, it was found that by subjecting the original composition to additional processing, within 2 hours, the physical and mechanical properties of ceramic bricks can be improved.

Exploring Possibilities of Implementation of Special Rutile Electrodes for Welding Microalloyed Steels

2016 ◽  
Vol 1138 ◽  
pp. 19-24
Author(s):  
Mihailo Mrdak ◽  
Nikola Bajić ◽  
Marko Rakin ◽  
Darko Veljić ◽  
Zoran Karastojković ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Microalloyed Steel ◽  
Raw Materials ◽  
Microalloyed Steels ◽  
Test Results ◽  
Medium Thickness ◽  
Cored Wire ◽  
Ni Content

The paper presents test results of a new quality of a special rutile electrode, with a core of flux-cored wire made from local raw materials, based on analyzing mechanical properties and microstructure of the weld metal in MMA welding. The base metal for experimental welding was microalloyed steel marked J55 (thickness 7.0 mm) according to API Spec 5L standards (EN 10113-3. and JUS C.B0 502) which was produced in Smederevo steelworks. For experimental welding a special electrode IHIS E 35 R-2 was used, with a medium thickness rutile coating, a core of flux-cored wire and Ni content of 2.5%. The results of the analyzes indicate that the new quality special rutile electrode with the flux-cored wire core provides good structural and mechanical properties of weld metal in microalloyed steel welded joints.

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