Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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Recycling concrete &building rubble is not only able to bring profit to investors, but also good for environment protection.
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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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The vibrating screen is a kind of sieving equipment of international advanced level, developed by our…
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Sofol VSI Series vertical shaft impact crusher is designed by reputed German expert of Sofol and every…
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How the weaker ITZ between recycled aggregate and mortar in recycled concrete affects the transport mechanism of chloride ions has become the main obstacle to the large-scale promotion and recycling of demolished building waste. To tackle this issue, a novel equivalent single-phase analytical method was proposed and a series of …
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1.2. Crushing process. Special facilities have become familiar in some parts of the world for recycling waste into coarse aggregate and for use in new civil engineering applications such as roads, pavements, or for structural concrete. An important stage in the processing of CDW is the crushing.
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The use of geopolymer concrete with recycled aggregate is a complex topic. When recycled aggregates are used with (Geo Polymer Cement) GPC or with ordinary cement, interfacial transition zone develops between the attached mortar and (Recycled Aggregate) RA. This is one of the weakest zones, and proper analysis is …
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The use of recycled aggregate as a partial or total replacement of the conventional aggregate for construction is a promising approach to ensuring sustainability in the built environment. Except for the need of improving its quality, recycled aggregate has become a reliable solution to the depleting over explored natural sources.
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These methods increase the cost of recycling. Recycling is crucial for managing e-waste effectively. Collection and transportation of e-waste to recycling facilities are the initial stages in the process. Shredding, sorting, and separation of materials are performed to extract valuable commodities like metals and plastics, as shown in Fig. …
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The recycled aggregates used were classified into three different types according to their measured specific gravity and water absorption, namely, RG I for recycled coarse aggregate having a ...
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The slump test is the common and practical workability test for fresh concrete and is performed in accordance with ASTM C143 [17]. Fig. 1 shows the slump values for HPCs that are prepared with natural aggregate (b) and RA (c). The maximum detected slump value of HPC without RA was 185 mm [18].Previous studies, however, had …
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Recycled aggregates are developed from the reprocessing of materials that have been originally used in construction. They include sand, gravel, crushed stone, and asphalt. Essentially, the term refers to materials that have been previously used in construction. A process of reprocessing which consists of crushing and mixing is then …
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Hence, for the structural concrete Natural Aggregate can be replaced by the Recycled Aggregate up to 60% range. I INTRODUCTION: To achieve sustainable issue in construction area, researchers and companies focus on using waste concrete as a new construction material. It is called recycled aggregate which can be produced by …
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In Japan, recycled concrete aggregate (RCA) and recycled-aggregate concrete (RAC) are standardized in the Japanese Industrial Standards (JIS) A 5021–5023. The differences between the specifications in JIS and those in foreign countries are explained. In Japan, the durability of RAC under severe conditions, particularly freezing …
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The recycled aggregate used in this work comes from the Residue Recovery Unit at Centro de Tratamento de Resíduos Grajaú (CTR Grajaú), which belongs to Odebrecht Ambiental, and is produced from the crushing of the construction residues generated in the city of São Paulo, Brazil. CTR Grajaú is the largest civil construction …
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[49] Tam V. W. Y., Gao X. F. and Tam C. M. 2005 Microstructural analysis of recycled aggregate concrete produced from two-stage mixing approach Cem. Concr. Res. 35 1195-1203. Crossref; Google Scholar [50] Wahab A. B. and Lawal A. F. 2011 An evaluation of waste control measures in construction industry in Nigeria 5 246-254. …
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recycled aggregate concrete showed percentage reduction in compressive strength of 16.10%, 16.31%, 14.67%, 26.06%, 29.28% and 17.54% for 10%, 20%, 30%, 40%, 50% and replacements of natural aggregates with recycled ... In Nigeria, the cost of natural aggregate is on the increase; thus the reuse of recycled aggregates to make new …
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Public water supply in Lagos State, Nigeria: Review of importance and challenges, status and concerns and pragmatic solutions. ... Efficiencies of carbonation and nano silica treatment methods in enhancing the performance of recycled aggregate concrete. L Li, D Xuan, AO Sojobi, S Liu, CS Poon. Construction and Building Materials 308, 125080 ...
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Strength properties of recycled aggregate concrete were enhanced with addition of ceramic powder and ceramic coarse fraction, more than the strength developed in the control concrete. ... (British Standard Institute, Citation 1989a; Nigeria Industrial Standards Center, Citation 1989, Citation 2003), gravel of 12.7 mm nominal sizes, and river ...
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2.1. Application in Concrete. C&DW can be used in concrete as coarse/fine aggregate and a finely ground material (i.e., filler). Concerning aggregate, Robalo et al. [] observed that replacing NA with C&DW progressively increases the water or superplasticizer admixture to keep the workability of concrete due to the high porosity …
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The applications of recycled aggregate as partial replacement of coarse aggregate in the range of 20 to 40% have been reported to be successful [5]. A study by Bairagi [6] concluded that up to 50% of natural aggregate could be replaced by recycled aggregate without seriously affecting the properties of the concrete, both in the fresh and ...
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Abdulmumin Edidi is a Civil Engineer, Youth and Community Development Advocate, also Research and Policy Development Enthusiast. He has being a part of projects ranging, Building, Bridge, and Road constructions, he also has a research publication on Effect of Recycled Aggregate on Concrete Strength in an attempt of …
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Recycled concrete aggregates (RCA) are used in existing green building composites to promote the environmental preservation of natural coarse aggregates (NCA). Besides, the use of RCA leads to potential solutions to the social and economic problems caused by concrete waste. It is found that insufficient information on the longevity and …
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The coarse recycled aggregate (RA) and recycled washed glass sand (RGS), meeting the requirements of BS EN 12620, were used in RAC mixes to substitute natural aggregates by 25% on mass basis. RA was graded 20-5 mm aggregates and observed to be irregular shaped compared to natural coarse aggregates. Recycled …
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Increase in construction activities leads to increased consumption of natural aggregates resources used in concrete and increased quantity of generated construction and demolishing wastes that are hazardous for the environment. Being a developing country that had faced wars and that owns numerous aged and damaged buildings, …
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Recycled Concrete Aggregate (RCA) To align with Singapore's vision in construction sustainability, Eastern Continent also recycle concrete debris from demolishing works and convert them into useable products as Recycled Concrete Aggregate (RCA). The primary process will be using excavator and jaw crusher to break up the concrete hardcore. The ...
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Regrettably, more than. 88% of the plastic waste produced in Nigeria is not recycled, Sogbanmu T.O. added. This has. negative impacts on our environmental, health, economy and, climatic crises ...
DetailsAn estimated 367 million tonnes (367 billion kg) of plastic were produced in 2020 alone – about 12 tonnes (12,000kg) of plastic waste produced every second that year. With about 2.5 million ...
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Nigeria is widely reported as having released up to 0.34 million tonnes of plastic debris into the ocean in 2010 and was ranked the ninth country in the world for pollution of marine environments.
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Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, polyethylene terephthalate (PET), glass, and slag. Furthermore, around 32 bi tons of natural aggregate (NA) are extracted …
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Up to 30% by mass of recycled aggregate as coarse aggregate, there is only a small difference in abrasion resistance (approximately 0.2mm), and which is within text repeatabi lity but below 30% ...
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Durability. Recycled aggregate concrete has better resistance to carbonation than natural aggregate concrete (Dhir and Paine 2007) because recycled aggregate concretes have higher cement content to achieve a given strength. Abrasion resistance of recycled aggregate concrete has been assessed using an accelerated abrasion method (Dhir et …
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Waste product from polyethylene materials are non-biodegradable and they form the bulk of the materials been used today. This paper looked into how this waste product was recycled in to polypropylene grains of sizes <4.5 mm and used to partially replace fine aggregate in concrete. Sieve analysis was carried out on the recycled …
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The Sustainable Choice for Construction Aggregates. Aggneo is a natural secondary aggregate, with the same quality and performance as aggregate. So, whatever the project, you don't have to compromise on strength or durability. By re-processing and reclaiming the aggregate, which would otherwise become waste material, we are driving …
DetailsThe total or partial replacement of natural aggregates with recycled ones in concrete mixes is a possible route towards the production of more environmentally sustainable materials [2], [3]. A viable solution involves the use of reclaimed asphalt pavement (RAP) to be applied as recycled aggregate for concrete.
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This paper highlights the menace of plastic pollution in Nigeria, opportunities in plastic recycling, government policies and technological efforts in the development of plastic recycling. Global ...
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Recycled aggregates are the product of processing inert construction and demolition waste, asphalt planings and used railway ballasts into construction aggregates. Just as primary aggregates, these materials conform to European aggregate standards and national specifications, and make a key contribution to total aggregates demand.
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Environmentally Sustainable. Arguably, one of the greatest advantages of recycled aggregate is the fact that it is environmentally sustainable. It typically uses far less energy during the production stages and eliminates the need for quarrying material. In addition, material deposits are where they are.
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In addition, this study evaluated the effects of recycling PET plastic bottle wastes produced in North Central Nigeria in BAC used in flexible pavement construction. The mix design consists of 60/70 penetration-grade asphaltic concrete (5%), and aggregate composition comprising 68% coarse aggregate, 6% fine aggregate, and 21% filler.
DetailsRecycled Aggregate Types. Recycled Type 1 (Sub-Base) Type 1 recycled aggregate is a type of recycled construction material that is produced from crushed concrete and sometimes includes other materials such as brick, asphalt, or rock. It is often used as a sub-base material for road construction, pathways, and hard-standing areas.
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2 Dep t of Civil Engineering, Yaba College of Tec hnology, Lagos, Nigeria . ... Recycled aggregate concrete is normally classified as light weight concrete and recommended for use in production of ...
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To take care the defects resulting from recycled aggregate in fresh and hardened concrete, various filler materials are used in the concrete. ... Covenant University, Ota, Nigeria. He has published several articles in renowned journal outlets and conference proceedings. His pedagogical interests include but not limited to; structural health ...
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The plant and process are enough to fast-track the evolution of plastics recycling in the country and support jobs along the recycling value chain. This will be a big win for Nigeria's economy and its environment.". The $39 million financing package includes a $24 million senior 'A' loan from IFC and a $15 million subordinated loan from ...
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PROPERTIES OF RECYCLED AGGREGATE IN CONCRETE Table 7: Mix proportions used in the testing program of concrete Material Quantity of Materials by Weight W/C (water to Cement Ratio) 0.65 0.58 0.5 Cement Content (Kg/m³) 290 290 290 - water necessary for the mix (L) 188 168 145 - water quantity for absorption (L) 12 12 15 200 180 160 1,100 …
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PE series jaw crusher is usually used as primary crusher in quarry production lines, mineral ore crushing plants and powder making plants.
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