Fracture Energy Analysis of Eco-Concretes in Japan

2010 ◽  
Vol 168-170 ◽  
pp. 985-989
Author(s):  
Carlos Aquino ◽  
Shogo Yagi ◽  
Takahisa Okamoto

The raw materials from household garbage and industrial waste have increased its usage in the concrete and cement industries. These eco-materials have helped the environment, avoiding pollution, land filling or burning of waste and the usage of other natural resources. However, the cost of many eco-materials is still higher than that of common natural materials. It is necessary to study in detail its behavior and properties to decrease its cost and increase its performance. This research deals with Eco-cement and molten slag aggregate which main raw materials are household garbage and industrial waste. Concretes produced with Portland cement and Eco-cement were mixed with gravel, limestone, quartz and molten slag aggregates to compare its properties. The fracture energy, strength and modulus of elasticity tests were performed and discussed in this paper. The concretes produced with Eco-cement and molten slag aggregate show better results than those produced with Portland cement and natural aggregates.

2020 ◽  
Vol 10 (1) ◽  
pp. 351 ◽  
Author(s):  
Patrícia Rodrigues ◽  
José D. Silvestre ◽  
Inês Flores-Colen ◽  
Cristina A. Viegas ◽  
Hawreen H. Ahmed ◽  
...  

This study applies a methodology to evaluate the ecotoxicological potential of raw materials and cement-based construction materials. In this study, natural aggregates and Portland cement were replaced with non-conventional recycled concrete aggregates (RA) and fly ash (FA), respectively, in the production of two concrete products alternative to conventional concrete (used as reference). The experimental program involved assessing both the chemical properties (non-metallic and metallic parameters) and ecotoxicity data (battery of tests with the luminescent bacterium Vibrio fischeri, the freshwater crustacean Daphnia magna, and the yeast Saccharomyces cerevisiae) of eluates obtained from leaching tests of RA, FA, and the three concrete mixes. Even though the results indicated that RA and FA have the ability to release some chemicals into the water and induce its alkalinisation, the respective eluate samples presented no or low levels of potential ecotoxicity. However, eluates from concrete mixes produced with a replacement ratio of Portland cement with 60% of FA and 100% of natural aggregates and produced with 60% of FA and 100% of RA were classified as clearly ecotoxic mainly towards Daphnia magna mobility. Therefore, raw materials with weak evidences of ecotoxicity could lead to the production of concrete products with high ecotoxicological potential. Overall, the results obtained highlight the importance of integrating data from the chemical and ecotoxicological characterization of materials’ eluate samples aiming to assess the possible environmental risk of the construction materials, namely of incorporating non-conventional raw materials in concrete, and contributing to achieve construction sustainability.


Author(s):  
Iu. Halynska ◽  
T. Bondar

More and more companies in the world are striving to implement clean production strategies and maximize resource productivity in their operations. In the process of applying an integrated, preventive environmental strategy in production to reduce risks for both humans and the environment, stakeholders face causal effects and socio-environmental and economic interdependence in the implementation of clean production projects. All this contributes to the development and growth of scientific, methodological and methodological approaches to the implementation of clean production projects. Studying world and domestic experience in introducing of clean production can determine the ways to comprehensively solve environmental and economic problems in Ukraine and provide the prerequisites for creating an effective system of using natural resources in solving environmental and economic problems of the world, including climate change. The implementation of scientific approaches is possible through the distribution of information on the principles of clean production, the development and implementation of a set of economic and environmental factors for the development of production, the improvement of the mechanism for integrating of environmental factors of the economic development strategy, viewing environmental pollution standards and the special use of natural resources, as well as standards for their economic regulation with the goal of a gradual approximation to EU standards, the creation of a system of sustainable management of production development, stimulates environmental protection and ensures the careful use of natural resources. Therefore, the article discovers the basic principles, methods and mechanisms for creating of clean production projects. The prerequisites for creating an environmental direction in the production of goods and services, as well as the need for risk assessment in the introduction of clean production, are considered. Generalization of existing methods of introduction of clean production, taking into account the world experience, showed that despite the local prerequisites and financial and technological problems, it is profitable for enterprises to implement the concept of СР. The result is a synthesis of existing methods for introducing of clean production, taking into account international experience, which can reduce operating costs, can contribute to improving the safety of workers, as well as reducing the impact of business on the environment. It is obvious that clean production technologies are a good business for industry, as they help to reduce waste disposal costs, reduce the cost of raw materials, reduce the cost of damage to health, improve public relations, improve company productivity, and increase the competitiveness of local and international markets. Clean production is an integral part of the social process, which is in line with economic, political, ethical and cultural values. Keywords: clean production, sustainable development, environmental strategies, indicators of resource and energy intensity.


Author(s):  
V. V. Tytok

Trends in housing development should be based on the geographical location and climatic conditions of the region, national characteristics and culture, natural resources, transport links, density and living standards. Construction significantly affects the socio-economic development of the region. In this regard, increasing the sustainability of the regional construction complex, which is based on the building materials industry and the construction industry is a relevant and promising area of research.Demand in the building materials market continues to stimulate increased interest in the development of new types of efficient and inexpensive building materials. Since construction is one of the most material-intensive sectors of the economy, which consumes a large number of construction materials and products, various measures are taken to reduce their cost.In this regard, recently in the construction seek to make greater use of local building materials. This allows you to unload transport from long-distance transportation and significantly reduces the cost of construction. However, the building materials industry cannot develop by focusing only on natural sources of raw materials, as the costs of their extraction and processing are constantly growing. The use of man-made waste provides production with a rich source of cheap and often already prepared raw materials, which reduces the cost of manufacturing building materials.One of the promising areas in the construction of affordable housing is the maximum use of building materials and products that can be obtained from local raw materials and industrial waste. As local building materials are offered: clay, sand, soil, straw, reeds, flax. The use of industrial waste solves both environmental, fuel and energy problems and expands the raw material base of building materials.


2021 ◽  
Vol XXVIII (2) ◽  
pp. 120-124
Author(s):  
Ion Chiricuta ◽  

This work facilitates the application of modern technologies for road construction, by using steel slag instead of natural stone aggregates. This procedure will result in a significant decrease in the cost of works (slag, being an industrial waste, is much cheaper than natural aggregate). In the same time, the use of slag aggregates can result in protection of the environment, by eliminating slag storage spaces and by preserving the natural environment (extraction of natural aggregates may disturb groundwater and intensify erosion etc). Marshall stability, flow index and bulk density were determined for both kinds of aggregates, in order to find if the steel slag can safely replace the natural aggregates. By comparing the experimental results obtained for the two kinds of aggregates, it was confirmed the possibility of successfully using of steel slag as a substitute for natural aggregates in the base layer of a road structure.


2019 ◽  
Vol 8 (2) ◽  
pp. 4170-4175

The production of cement liberates the equal amount of CO2 into the environment. This will results in various social and environmental problems. There is a need in determining the new cement materials from waste or industrial waste. Second, the extraction of natural aggregates from natural resources poses other environmental problems. So in this article, the experimental programme is conducted to determine the strength and durability performance of cement partially replaced with Metakaolin (MK) (0%, 2.5%, 5%, 7.5% and 10%) and coarse aggregate substituted by shredded plastic waste (SPW) at 0.5% by weight. The main objective of this article was limited to analyzing the strength parameters along with the durability parameters.


Author(s):  
Gifty E ◽  
Harini Devi N ◽  
Meena P ◽  
Gunasekar S

With increase in population and urbanization, demand of raw materials such as cement and aggregate has increased in the construction industries. Further it has been recognized that waste from construction &demolition sectors are of large volume and this volume is increasing every year. Utilization of demolished waste offers not only the solution of disposal problems but also helps to conserve natural resources for meeting increased demand of aggregates and save energy. This study deals with the fabrication of concrete paver blocks using construction and demolition (C&D) waste as a replacement of natural aggregates.


2021 ◽  
Vol 11 (1) ◽  
pp. 231-235
Author(s):  
Atsu, A. M ◽  
Thwala, W. D. ◽  
Aigbavboa, C. O.

Manufacturing waste forms part of industrial waste which is also rooted in solid waste. In Ghana, the ruling government has a flagship project known as one district one factory (1d1f). Most of these factories that are established and yet to be established are manufacturing industries. No doubt that these industries will generate lots of waste which must be managed properly. Also, the more factories are built, the more waste will be created. The main purpose of this paper is to identify and try to control the exact sources of waste generation on the production line of manufacturing industries. The method used was literature review, and interview of industry players. From the literature review, it was found that several sources of waste have been established such as municipal sources of waste, medical/clinical sources, agriculture sources, end-of-life-of automobile, industrial sources of waste, construction/demolition sources, and electronic sources of waste (eschooltoday, 2020, amauomo and baird, 2016) whiles the results from the interview session revealed that the exact point on the manufacturing line of the industry, which can be termed as sources of waste are; at the beginning, and sometimes the end of the production line. Observation on the production line also confirmed the perception of the factory hands, that at the beginning, and the end. Once the sources are identified, it is possible to control it. In conclusion, it was revealed that factory hands do not make critical observation on the production line. They agreed that if the sources are identified and controlled, it will reduce the cost of production which will increase their profit margin. It is therefore recommended that manufacturing industries should take much interest in identifying the sources of waste creation on their production lines. Also, they should take measurement seriously when feeding raw materials into the production line.


2020 ◽  
Vol 30 (3) ◽  
pp. 311-316
Author(s):  
MSH Sunny ◽  
MR Islam ◽  
MS Rahman ◽  
MT Hasan

In Bangladesh, the cost of building materials is increasing gradually, available raw materials of construction are not sufficient to meet up the needs of the country. For that we have to find out cheaper and waste materials (such as ceramic waste) to reuse for construction. The study was conducted to observe the physical properties of waste ceramics and compressive strength of ceramics mortar for different curing ages. The study was done to check the probability of using waste ceramics instead of natural aggregates (sand).The fineness modulus of ceramics aggregates was 2.94. Ceramic aggregate absorbs 5.89% moisture whereas sand absorbs 14.33%. Generally, finer the aggregate shows greater the compressive strength. Though the fineness modulus of ceramics was greater than that of sand, it possessed higher compressive strength because of its self-strength. The ratio of mortar mixture was (1:2) and (1:3) for different curing periods both sand and ceramics samples. The compressive strength of sand and ceramic mortar was 2603 psi and 3500 psi respectively at the ratio of (1:2) for 3 days curing. On the other hand the compressive strength of sand and ceramics mortar was 2340 psi and 3075 psi respectively at the ratio of (1:3) for 3 days curing. Between the sand and ceramic mortar, the compressive strength of ceramic mortar was found maximum at 28 days curing period. It can be concluded that recycled ceramic aggregates will be used in comparatively low load bearing, low cost temporary and medium category farming etc. concrete structure. Progressive Agriculture 30 (3): 311-316, 2019


2019 ◽  
Vol 972 ◽  
pp. 3-9
Author(s):  
Malgorzata Ulewicz ◽  
Jakub Jura

The preliminary results of utilization of bottom ash from combustion of biomass for the produce of concrete has been presented. Currently, this waste are deposited in industrial waste landfills. The chemical composition of waste materials was determined using X-ray fluorescence (spectrometer ARL Advant 'XP). Concrete were made using CEM I 42.5 R (Cemex) and sand - gravel mix aggregate. The obtained concrete were subjected to microscopic examination (LEO Electron Microscopy Ltd.) and their compressive strength (PN-EN-196-1) and absorbability (PN-85/B-04500) were identified. The obtained results showed, the replacement of the natural aggregates by bottom ash from combustion of biomass reduce consumption of raw materials and will have a good influence on the environment.


2019 ◽  
Vol 105 ◽  
pp. 04048
Author(s):  
Alina Pinchuk ◽  
Nataliia Tkalenko ◽  
Vyktoriia Marhasova

The article is devoted to the issue of waste management in the mining regions, as the problems of industrial waste or waste products will always be relevant in nowadays. The most experts focus on urbanization processes, on increasing the resources’ requirements, which in turn will increase the needs of the population and environmental pollution. The processing of waste in the mining regions can be achieved through the use of elements of the circular economy, which will lead to the economic use of natural resources and the interaction of economic, environmental and social development. The building of Eco-Industrial Park using a sector-clustered approach to waste management is suggested in the conclusions. The Eco-Industrial Park will allow related industries to work in symbiosis, where secondary raw materials can be involved in recycling, remanufacturing, recovery, regeneration.


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