scholarly journals Materials From Hazardous Iron Ore Treatment Waste, Concrete Demolition Debris And Lime Production Waste to Increase Environmental Sustainability of Industrial Regions

2021 ◽  
Author(s):  
Vsevolod Mymrin ◽  
Ana Povaluk ◽  
Luana Cechin ◽  
Monica A. Avanci ◽  
Cleber L. Pedroso ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Iron Ore ◽  
Construction Materials ◽  
Solid Particles ◽  
Production Waste ◽  
Sustainable Construction ◽  
Natural Rock ◽  
Concrete Production ◽  
Ore Treatment ◽  
Lime Production

Abstract To prevent environment pollution by hazardous industrial dumps of iron ore treatment sludge, concrete production/demolition debris and lime production waste sustainable cement-less construction materials were developed for substitution of traditional natural raw components excavated in careers, irreversibly destroying natural bonds. Their ​​ axial resistance values on the 3rd day of hydration were till 2.34 MPa, on the 28th day - up to 3.94 MPa, on the 180th day 8.40 MPa and on the 365th day 10.22 MPa. The expanding coefficient on the 3rd day were till 2.13%, 2.51% on the 28th day, and on the 365th day 2.22%. Water absorption on the 28th day was 7.17 - 9.32% and decreases to 6.26 - 8.64% on the 90th day. All these characteristics correspond to the Brazilian norms. The physical - chemical processes of materials’ structures formation included alkaline dissociation of solid particles’ surface, with sol appearing and densification till transition to gel. Long-lasting gel compaction and densification to stone-like condition made its structure similar to natural rock materials - silica, opal, obsidian, perlite, pumice, amber, flask, etc. They can be used for production of road bases, concrete blocks and solid unburned bricks, among other sustainable construction materials.

scholarly journals Strength and Microstructure of Concrete with Iron Ore Tailings as Replacement for River Sand

2018 ◽  
Vol 34 ◽  
pp. 01003 ◽  
Author(s):  
Ali Umara Shettima ◽  
Yusof Ahmad ◽  
Mohd Warid Hussin ◽  
Nasiru Zakari Muhammad ◽  
Ogunbode Eziekel Babatude
Keyword(s):  
Iron Ore ◽  
Economic Value ◽  
Waste Product ◽  
Construction Materials ◽  
Sustainable Construction ◽  
Electron Microscopic ◽  
River Sand ◽  
Iron Ore Tailings ◽  
Concrete Production ◽  
And Performance

River Sand is one of the basic ingredients used in the production of concrete. Consequently, continuous consumption of sand in construction industry contributes significantly to depletion of natural resources. To achieve more sustainable construction materials, this paper reports the use of iron ore tailings (IOT) as replacement for river sand in concrete production. IOT is a waste product generated from the production of iron ore and disposed to land fill without any economic value. Concrete mixtures containing different amount of IOT were designed for grade C30 with water to cement ratio of 0.60. The percentage ratios of the river sand replacements by IOT were 25%, 50%, 75% and 100%. Concrete microstructure test namely, XRD and Field Emission Scanned Electron Microscopic/Energy dispersive X-ray Spectroscopy (FESEM/EDX) were conducted for control and IOT concretes in order to determine the interaction and performance of the concrete containing IOT. Test results indicated that the slump values of 130 mm and 80 to 110 mm were recorded for the control and IOT concretes respectively. The concrete sample of 50% IOT recorded the highest compressive strength of 37.7 MPa at 28 days, and the highest flexural strength of 5.5 MPa compared to 4.7 MPa for reference concrete. The texture of the IOT is rough and angular which was able to improve the strength of the concrete.

scholarly journals New composites from waste: iron ore, pulp, lime, and concrete

2020 ◽  
Vol 24 ◽  
pp. e6
Author(s):  
Cleber Luis Pedroso ◽  
Vsévolod Mymrine ◽  
Elizabete Yukiko Nakanishi Bavastri ◽  
Daniela Evaniki Pedroso ◽  
Alfredo Iarozinski Neto ◽  
...  
Keyword(s):  
Axial Compression ◽  
Iron Ore ◽  
Raw Materials ◽  
Construction Materials ◽  
Production Waste ◽  
Water Addition ◽  
Lime Production ◽  
Compression Resistance ◽  
Potential Use

This research aimed at the development of new composites for civil construction using only industrial waste, namely, iron ore tailings (IOT), pulp production waste (PPW), lime production waste (LPW), and concrete waste (CW). The characterization of raw materials was carried out through particle size, specific mass, hydrogen potential (pH), loss on ignition (LOI) tests, and scanning electron microscopy (SEM); and, it was analyzed axial compression resistance and SEM in the developed composites. The specimens for the resistance test were molded, always using the same four types of residues in the mixture, with only water addition and no other type of binder. The residues proportions used were, in percentage, 10% to 40% of IOT and PPW, 25 to 30% of the LPW, and 15% to 25% of CW, distributed in 19 different compositions, that is, the proportions' variation of the residues in each specimen. The specimens were tested at the ages of 3, 7, 14, 28, 60, 90, 180, 365, and 720 days of cure. The results indicated a slight increase in resistance with increasing curing time, with emphasis on compositions 16 and 17, whose 28-day axial compression resistance reached 4.07MPa and 6.92MPa, respectively. In these two compositions (16 and 17), the formation of new structures was observed in the materials due to the neutralization and dissolution of the surfaces, as the alkalinity gradually decreased over time, with the hydrogen potential (pH) around 7.50 that, consequently caused the synthesis of new amorphous and crystalline formations. In this context, the studies allowed to conclude that the association of industrial residues has potential use as civil construction materials, for instance, in concrete artifacts, besides contributing to the reduction of finite natural resources extraction. It also provides a correct destination for the waste disposed of inappropriately, that constantly menaces the environment and the society that lives around it.

scholarly journals Innovation potentials for construction materials with specific focus on the challenges in Africa

2020 ◽  
Vol 5 ◽  
pp. 63-74
Author(s):  
Wolfram Schmidt ◽  
Mike Otieno ◽  
Kolawole Olonade ◽  
Nonkululeko Radebe ◽  
Henri Van-Damme ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Cementitious Materials ◽  
Sustainable Construction ◽  
African Continent ◽  
Concrete Technology ◽  
Rich Diversity ◽  
The Rich ◽  
Basic Infrastructure ◽  
Industrialised Countries

Africa is urgently in need of adequate basic infrastructure and housing, and it is one of the continents where massive construction activities are on the rise. There is a vast variety of potentially viable resources for sustainable construction on the continents, and consequently, the continent can bring innovative, greener technologies based on local sources effectively into practice. However, unlike established concrete constituents from industrialised countries in the global North, most of the innovation potentials from the African continent have not yet been the focus of intensive fundamental and applied research. This clearly limits the implementation of more sustainable local technologies. This paper presents a case for the need to first appreciate the rich diversity and versatility of the African continent which is often not realistically perceived and appreciated. It discusses specific innovation potentials and challenges for cementitious materials and concrete technology based on local materials derived from sources on the African continent. The unique African materials solutions are presented and discussed, from mineral binders over chemical admixtures and fibres to reinforcement and aggregates. Due to the pressing challenges faced by Africa, with regards to population growth and urbanisation, the focus is not only put on the technological (durability, robustness and safety) and environmental sustainability, but also strongly on socio-economic applicability, adaptability and scalability. This includes a review of alternative, traditional and vernacular construction technologies such as materials-saving structures that help reducing cementitious materials. Eventually, a strategic research roadmap is hypothesised that points out the most relevant potentials and research needs for quick implementation of more localised construction materials.

scholarly journals Binders alternative to Portland cement and waste management for sustainable construction—part 1

2018 ◽  
Vol 16 (3) ◽  
pp. 186-202 ◽  
Author(s):  
Luigi Coppola ◽  
Tiziano Bellezze ◽  
Alberto Belli ◽  
Maria Chiara Bignozzi ◽  
Fabio Bolzoni ◽  
...  
Keyword(s):  
Waste Management ◽  
Portland Cement ◽  
Greenhouse Gases ◽  
Renewable Resources ◽  
State Of The Art ◽  
Construction Materials ◽  
Sustainable Construction ◽  
Greenhouse Gases Emissions ◽  
Concrete Production ◽  
Alkali Activated

This review presents “a state of the art” report on sustainability in construction materials. The authors propose different solutions to make the concrete industry more environmentally friendly in order to reduce greenhouse gases emissions and consumption of non-renewable resources. Part 1—the present paper—focuses on the use of binders alternative to Portland cement, including sulfoaluminate cements, alkali-activated materials, and geopolymers. Part 2 will be dedicated to traditional Portland-free binders and waste management and recycling in mortar and concrete production.

Characterization of construction materials on the base of mortar waste, activated by aluminum anodization sludge and lime production waste

2019 ◽  
Vol 212 ◽  
pp. 202-209 ◽  
Author(s):  
Vsevolod Mymrin ◽  
Andrea Molinetti ◽  
Kirill Alekseev ◽  
Monica A. Avanci ◽  
Walderson Klitzke ◽  
...  
Keyword(s):  
Construction Materials ◽  
Production Waste ◽  
Aluminum Anodization ◽  
Lime Production

scholarly journals Engineering Properties of Concrete Made with Coal Bottom Ash as Sustainable Construction Materials

2022 ◽  
Vol 8 (1) ◽  
pp. 181-194
Author(s):  
Fanny Monika ◽  
Hakas Prayuda ◽  
Martyana Dwi Cahyati ◽  
Erwiena Nurmala Augustin ◽  
Hilal Aulia Rahman ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Bottom Ash ◽  
Construction Materials ◽  
Engineering Properties ◽  
Sustainable Construction ◽  
Full Potential ◽  
Fine Aggregate ◽  
Concrete Production ◽  
Hardened Properties

Concrete is considered one of the construction materials that contribute the most significant carbon dioxide in the world. Meanwhile, according to various studies, concrete production will continue to rise through 2050, especially in developing countries. According to several reports, cement manufacture is one of the largest sources of carbon dioxide in the concrete sector. In addition, overexploitation of aggregates due to concrete production also causes unavoidable natural damage. Bottom ash waste was used as a replacement for cement and fine aggregate as sustainable construction materials. It is envisaged that this research would allow industrial waste to be utilized to its full potential, resulting in a concrete that is more environmentally friendly and minimizes carbon dioxide emissions during the manufacturing process. This study is divided into bottom ash as a cement substitute and bottom ash as a fine aggregate substitute. The engineering properties of the concrete were checked during the experiments in this study when it was fresh and hardened states. The slump test is used to determine the workability of fresh concrete. While for the hardened properties tests consist of compressive strength, splitting tensile strength, flexural strength, and mass density. The usage of bottom ash as a cement replacement demonstrates that as the composition of bottom ash increases, the performance of the hardened properties of concrete decreases. While using bottom ash as a fine aggregate replacement reveals that the performance of hardened properties has improved as the proportion of bottom ash utilized has increased. Doi: 10.28991/CEJ-2022-08-01-014 Full Text: PDF

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