Fig. 10 shows concrete containing natural coarse aggregate and recycled brick coarse aggregate (Liu et al., 2021). Hence, the RCA's physical, chemical, and mechanical characteristics must be investigated before use (Mills-Beale and You, 2010). As previously discussed, it is important to note that these properties would differ from the ...

Nigeria. [53] Busari, A., Joshua, O., Oyedepo, J., Olawuyi O., K. Daramola. ... recycled aggregate produced from C&D waste can be employed in various civil engineering works, which can help in a ...

Recycled coarse aggregate was prepared and impervious materials were removed. Aggregates were recovered from broken structural components such as slabs, beams, and columns.

Over 1500𝑚3 of recycled aggregate concrete (RAC) which utilized only recycled coarse aggregates was supplied for foundations, floor slabs, waffle floors and structural columns [13]. Additionally, the Vilbeler Weg reinforced concrete office building with an open multi-storey garage, built in Darmstadt in 1997/1998 was constructed with ...

Engineering at the University of Nigeria, Nsukka, ... like recycled aggregate, polystyrene aggregate [8], laterite and quarry dust [9], etc. have been used. A good number of these

Recycled aggregate has a high water absorption rate, and more water is often needed to be added to the production. Nie et al. [67] found that when the dosage was , compared with natural aggregate concrete, the water consumption of ordinary quality RCA concrete increased by 12.4%. It is due to a large amount of mortar attached to the ...

The use of Recycled Concrete Aggregate (RCA) is gaining importance throughout the globe due to the depleting sources of natural aggregate and disposal problem of demolished waste.

Overall, the study suggests that recycling rubber tire waste as an aggregate in concrete is a viable approach for solid waste management and can also provide environmental and economic benefits.

Recycled and secondary aggregates are making an increasingly important contribution to the UK's needs.. ... However continued effort is required to instil confidence with the recycled aggregate across the full range of private and …

The comprehensive information presented in Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste will be helpful to graduate students, researchers and concrete technologists. The collected data will also be an essential reference for practicing engineers who face problems concerning the use of these materials in ...

research has shown that it is viable option to use recycled concrete aggregates to replace natural aggregates (NA) in structural concrete. Structural examples of the use of RCAs are outlined in …

If you peer into the gutters of any big Nigerian city, a filthy sight awaits you: Floating cans, nylon water sachets, empty bottles and other waste materials discarded by humans, swept there by ...

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 …

Also recycled aggregate mixed with ceramic showed good mechanical performance due to their high bearing capacity (measured by CBR Index) for use in sub-bases in low traffic roads. 6.2. Capping layer. On weak sub-grades, it is common practice to use a capping layer between sub-grade and sub-base layers. This reduces the thickness of sub-base and ...

Ahmadu Bello University, Zaria, Nigeria ... recycled aggregate replacing natural aggregate increased from 0% to , the compressive strength decreased from 30.85 Mpa to 17.58 Mpa which is a 43% decrease as compared to natural aggregate concrete. A 10% addition of …

This paper reports the results of a study conducted to investigate the effect of Recycled Concrete Aggregate (RCA) replacement with Normal Concrete Aggregate (NCA) at 0%, 50% and .

The C&DW consists of a stream of heavy materials such as concrete, wood, metal, gypsum, plastic, etc., among which concrete is the main debris (Mak et al., 2019)., Natural aggregate (NA) is the main constituent of concrete and is generally used to fabricate concrete by at least 60% by mass of total blends (Mo et al., 2020), and is thus embedded ...

In addition, methods for enhancing the mechanical characteristics of recycled aggregate and long-term efficiency such as improving the properties without modifying the recycled aggregate (namely, different concrete mixing designs and the addition of reinforcing fibers) were reviewed. The machine learning model for predicting compressive ...

The sustainability assessment of recycled aggregate structures should consist of environmental, social, and economic assessments. While environmental assessment has a two-decade-long tradition, social assessment was much less investigated probably due to the inherent complexity of the nature of different possible social impacts. On the other ...

Recycled Aggregate 32 Background Shortage of aggregate: Consumption 4 billion T/25 years; 6 lane expressway= 52 T/km (APAO, 2004) Concrete Waste: 150 million T/year in USA ±(Salem 2003) Increased sustainability: Growing shortage of natural aggregate required using RCA Barriers to RCA use High cost of concrete crushers

In Nigeria, this favors rigid plastic and disregards low weight water sachets, because waste pickers are paid by weight. In general, the improper management of plastics is a growing issue but the infrastructure is not growing at the same pace – only half of plastic waste is currently collected and around 10% recycled.

There have been efforts to use building demolition waste as an alternative aggregate in concrete to decrease the use of natural resources for construction. The World Green Building Council estimates that the construction industry is responsible for more than 50% of all material extracted globally and that construction and demolition waste makes up 35% of global …

recycled concrete aggregates (RCA) [4]. Initially, the recycled aggregate (RA) was used for non-structural purposes such as fill material, base course material and foundations, however, modern research has shown that it is viable option to use recycled concrete aggregates to replace natural aggregates (NA) in structural concrete.

In Nigeria, there is no record of recycled concrete or coarse aggregate remediation but in recent time, recycled coarse aggregate has become a major source of financial relief to some developers and a means of livelihood to concrete re-cyclists in some Nigerian cities.

As the construction industry faces growing environmental concerns and a need for viable practices, this study explores the potential for substituting natural aggregates (NA) with …

Notable examples include studies on: recycled concrete aggregate properties with amounts of old adhered mortars (Duan and Poon Citation 2014), the current status on the use of recycled aggregates in concrete (De Brito and …

However, the sample with recycled aggregate was still better than that with marble waste in this regard. ... (Nigeria) was used for this . study conforming to ASTM C150.1 /C150M-20, and .

The tests were carried out in the laboratory by replacing the natural aggregate (NA) with recycled concrete aggregate (RCA) in different percentages 50%, 75% and . The physical properties of RCA were evaluated for crushed and graded concrete rubble gathered from different demolition sites and landfill areas.

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 concrete ...

Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture …