EFFECT OF TEMPERATURE ON RECYCLED AGGREGATE …
The results. showed th at the worka bility of th e recycled ag gregate concrete reduced considerably as the amount of recycled aggregate. increased. The specimen were cured for 28days and aft ...
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Recycled Concrete Aggregate (RCA) – KTC Group
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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The Utilization of Electronic Waste to Produce Recycled E
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 Utilization of Recycled Aggregate in High
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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IFC Supports Nigeria's Plastics Packaging and Recycling …
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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(PDF) Recycled aggregates in concrete …
Recycled aggregates and particularly, recycled concrete aggregate substantially affect the properties and mix design of concrete both at. fresh and hardened states since it is known by high ...
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The environmental benefits of recycled aggregates
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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Understanding the different types of recycled aggregates
Recycled 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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(PDF) Recycling Demolition Waste Sandcrete Blocks as Aggregate …
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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(PDF) A SOLUTION TO THE PROBLEM OF RECYCLED …
The recycling of the concrete, bricks and masonry rubble as concrete aggregates is an important way to contribute to a sustainable material flow; but this is not the case in Nigeria because of the various uncertainties limiting the widespread use of Recycled concrete Aggregate (RCA).
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Recycled & Secondary Aggregates
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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Use of Recycled Polypropylene Grains as Partial Replacement …
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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Full article: Recycling of polyethylene terephthalate (PET) plastic
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.
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(PDF) Fine recycled concrete aggregate as a material …
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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Hydration mechanism and strength properties of recycled aggregate
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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Recycled Aggregate: A Viable Solution for Sustainable …
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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Mechanical evaluation of recycled aggregate mixes and
The raw material required for laboratory and field investigations was procured from different sites. Recycled aggregates were collected by milling the bituminous layer of Narwana-Tohana Road (MDR-112), Jind, Haryana, as shown in Fig. 1.To maintain the homogeneity, self-prepared sampling pattern was followed according to which samples …
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(PDF) SOLUTIONS TO PLASTIC PROBLEMS IN NIGERIA
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 ...
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Crystals | Free Full-Text | Use of Recycled Concrete …
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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Recycled Concrete Aggregate
19.2.1 Recycled concrete aggregate (RCA). Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006).In designated concrete RC20/25 to RC40/50, RCA can automatically …
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A. O. Sojobi
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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ENVIRONMENTAL MENACE OF PLASTIC WASTE IN NIGERIA …
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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Challenges and prospects of plastic waste management in Nigeria
Secondary recycling—involves the processing of waste into products of different characteristics. 3. Tertiary recycling—involves the production of basic chemicals and fuel from segregated municipal waste. 4. Quaternary recycling—involves energy extraction by partial or complete oxidation of the material [1, 66].
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(PDF) Review Of The Use Of Construction And Demolition …
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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Recycled Aggregate in Pavement Construction: Review of Literatures
[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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Advances on the Use of Geopolymer Recycled Aggregate …
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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Filler-Ability of Highly Active Metakaolin for Improving
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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Performance of Recycled Asphalt Pavement as Coarse …
The waste asphalt pavement rubbles were crushed, sieved and graded to sizes similar to that of the natural gravel. The RAP coarse aggregate consist therefore of "asphalt-mortar" (asphalt binder-sand-filler matrix) coated aggregates retained on 4.75 mm sieve. The physical properties of RAP aggregate are shown in Table 1.
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Effect of ITZ on chloride ion transport in recycled aggregate …
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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Review Of The Use Of Construction And Demolition Waste In …
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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