And if the aggregate used in the concrete is crushed, it is called as recycled aggregates. The construction and demolition waste in its …
A Comparative Study Investigating the Feasibility and Potential of Utilising Polymer, Demolition & Glass Waste as a Partial Replacement for Fine and Coarse Aggregate in Concrete December 2023 DOI ...
Resource utilization of construction and demolition (C&D) waste has great potential to significantly reduce the consumption of natural resources and improve the environment. Meanwhile, establishing a sound policy system and reducing production are the key ways to solve the problem of C&D waste. Numerous studies on C&D waste, …
The use of recycled concrete aggregate (RCA) from construction and demolition waste (CDW) in new concrete production is a promising solution to reduce the exploitation of non-renewable resources and landfill waste. Nowadays, only a small part of RCA is recycled due to severe regulatory restrictions in this field.
To enhance the utilization of recycled aggregate concrete, its performance in terms of mechanical characteristics need to be optimized. ... Every year, India generates 29.75 million tonnages of construction—waste, and demolition waste, and these numbers are expected to quadruple over the next ten to 15 years and it is 30–40% of global ...
Similar to other countries, the major components of C&D waste generated in Korea are concrete and asphalt. Hence, research and development (R&D) related to the recycling of C&D waste has been carried out in the direction of producing high-quality recycled aggregate from concrete and asphalt waste (Kim & Chung 2012).As a result …
Recycled aggregates (RA) from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco …
Three types of aggregates were used in this study which include natural sand as fine aggregate (NFA), coarse aggregates with grading of 4.75–20 mm were dolomite as natural (NCA) and the crushed concrete rubble as (RCA) which were collected from fifteen different sources of demolished buildings and landfill locations then crushed using a …
Brick-based construction and demolition waste (CDW) was successfully used to prepare lightweight aggregate concrete, and the effects of the CDW mineral admixture and aggregate on workability, hardened performance, microstructure and influence mechanism were also investigated. The results indicated that replacing …
To investigate the effect of brick-based CDW on lightweight aggregate concrete, CDW aggregate and mineral admixture were respectively used to replace lightweight aggregate by volume and cement by mass, the mixture proportions were shown in Table .1, and the reference (A1) was a popular proportion in local concrete factory of …
Resource utilization of construction and demolition (C&D) waste has great potential to significantly reduce the consumption of natural resources and improve the …
The aggregate gradings for limestone quarried aggregates, supplied by a block making factory, as well as recycled concrete aggregate (RCA) and recycled masonry aggregate (RMA) supplied by local demolition companies are shown in Fig. 1. The concrete construction and demolition waste (C&DW) that was crushed to produce …
The recycled aggregate concrete (RAC) exhibited lower density, compressive and indirect tensile strength when compared to that of control concrete. ... Properties and composition of recycled aggregates from construction and demolition waste suitable for concrete production. Constr. Build. Mater., 65 (2014), pp. 201-217. View …
Concrete has become a widely used building material, with the global concrete consumption estimated to be around 14 billion cubic meters in 2020, according to statistics from the Global Cement and Concrete Association (GCCA) [].Aggregates in concrete are an essential component, constituting approximately 75% of the total …
The cement content (Q c) and aggregate content (Q a) were determined based on the proportion of materials used in producing the concrete. To estimate the amount of calcium oxide present in the cement (CaO c ) and the percentage of CaO that is completely carbonated (%CaO c ), a recommended value of 65% and 75%, respectively …
DOI: 10.1016/J.JCLEPRO.2018.03.085 Corpus ID: 158557449; Construction and demolition waste generation and properties of recycled aggregate concrete: A global perspective @article{Akhtar2018ConstructionAD, title={Construction and demolition waste generation and properties of recycled aggregate concrete: A global …
An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate ...
Recycled aggregates from construction and demolition waste (CDW) instead of natural aggregates (NA) were analysed in the manufacture of new eco-friendly concrete and revealed that the use of RA in percentages of up to 50 wt.% is feasible, thereby saving production costs and minimizing environmental impact. Recycled …
The demolition of old concrete structures is an increasing trend, mainly due to their technical state, end of service-life and plans of modernization. ... Two identical twin towers, with one tower made of recycled aggregate concrete and the other made of natural aggregate concrete led to 2.175 × 10 5 ...
Aggregate. Three types of aggregates were used in this study which include natural sand as fine aggregate (NFA), coarse aggregates with grading of 4.75–20 mm were dolomite as natural (NCA) and the crushed concrete rubble as (RCA) which were collected from fifteen different sources of demolished buildings and landfill locations then …
Furthermore, it was also suggested to use the recycled aggregates from 30 to 50% to achieve the strength equivalent to natural aggregate concrete with supplementary cementitious materials. More research is imperative in the area of unconventional supplementary materials in recycled aggregate concrete and full …
For the purpose to produce M30 grade concrete, this research paper will investigate the usage of construction and demolition debris as reused concrete aggregate. The incorporation of RCA in concrete offers several potential benefits, including reducing the demand for natural aggregate, minimizing the disposal of CDW in landfills, …
Recycled Concrete Aggregate (RCA): consisting of a minimum of 90% by weight of Portland cement-based fragments. • Recycled Masonry Aggregate (RMA): …
The model analysis results approved that concrete with lower density and water absorption, and superior compressive strength of 49.70MPa could be manufacturedusing demolishing concrete as coarse ...
The main aim of this review is to present the status of construction and demolition waste generation around the world and subsequently provide a critical …
After removal of contaminants through selective demolition, screening, and /or air separation and size reduction in a crusher to aggregate sizes, crushed concrete can be used as: new concrete for pavements, …
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 …
The main objective of this research is to investigate the possibility of utilizing construction & demolition waste aggregate in rigid pavement construction. In the present study compressive strength of concrete at 7, 14, and 28 days was checked, ... concrete. Metal coarse aggregate is replaced by recycled coarse aggregate by weight in M25 grade ...
This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture process, inherent defects (e.g. existing of additional interfacial transition …
