· Recycled Coarse Aggregate (RCA) concrete construction technique can be called as 'green concrete', as it minimizes the environmental hazard of the concrete waste disposal. Indian standard recommends target mean compressive strength of the conventional concrete in terms of water cement ratio (w/c). The present work is an …

Purpose: Recycling construction waste is a promising way towards sustainable development in construction. Recycled aggregate (RA) is obtained from demolished concrete structures, laboratory crushed concrete, concrete waste at a ready mix concrete plant and the concrete made from RA is known as RA concrete.

COARSE AGGREGATE. Coarse aggregates refer to irregular and granular materials such as sand, gravel, or crushed stone, and are used for making concrete. In most cases, Coarse is naturally occurring and can be obtained by blasting quarries or crushing them by hand or crushers. It is imperative to wash them before using them for producing concrete.

recycled concrete aggregate (RCA), mainly composed of coarse particles of concrete; recycled masonry aggregate, mainly composed of coarse particles of brick; and mixed …

 · To produce purer and more valuable recycled concrete aggregate, calcination and grinding process is added after crushing, sieving, and contamination removing. …

 · Chandra, S. (2004), "Implications of using recycled construction demolition waste as aggregate in concrete", Proceedings of the International Conference on Sustainable Waste Manage and Recycling: Construction Demolition Waste, Kingston University, London, U.K., September.

 · The use of Recycled Coarse Aggregate (RCA) in concrete is one of the ways of demolished waste utilization [5, 6]. ... Ebid M, Okba SH (2013) Recycled construction and demolition concrete waste as aggregate for structural concrete. HBRC J 9(3):193–200. CrossRef Google Scholar

 · The produced coarse recycled concrete aggregate is sent to a rotary kiln for calcination, which can burn the combustible impurities into ashes. The calcined aggregate is then ground into powder by ball mills and Raymond mills. The calcination treatment method removes the combustibles in the recycled concrete aggregate and reduces the moisture ...

 · Characterization study on recycled coarse aggregate for its utilization in concrete - A review. S Jagan 1, ... [27] Zhou Chunheng and Chen Zongping 2017 Mechanical properties of recycled concrete made with different types of coarse aggregate Construction and Building Materials 134 497-506. Google Scholar

 · An experimental study of recycled aggregate concrete (RAC) using recycled coarse aggregate (RCA) is reported. The RCA was obtained from construction and demolition waste (C&DW) and used as full ...

 · For the purposes, six 200 kg recycled coarse aggregates (RCAs) samples were collected from a conventional recycling plant in Korea. Subsequently, the samples were processed by a heavy media separation process using Fe 3 O 4 suspensions with various densities from 2.65 g/cm 3 to 2.40 g/cm 3 with an interval of 0.05 g/cm 3.

The construction and demolition waste aggregates are classified by BS 8500 (2002). The code classifies this into two types as: Recycled Concrete Aggregates (RCA) Recycled Aggregates (RA) The concrete aggregate that contains 95% of crushed concrete is called as recycled concrete aggregates. And if the aggregate used in the concrete is ...

 · Coarse Aggregate: The Coarse aggregate was used as Recycled coarse aggregate (RCA). The specific gravity of the RCA was 2.30. The Fineness modulus was …

 · A linear regression analysis is used to construct the correlation among the aggregate properties. From the result, it is refined six groups of tests: (1) particle size distribution; (2) particle density and strength; (3) strength and abrasiveness; (4) weak particle; (5) particle shape; and (6) chemical contents.

 · Next, the recycled coarse aggregate was measured using temporary weighing and loading equipment installed at the construction site, and was loaded to the truck …

 · Authors in [2] found that recycled coarse aggregates and natural aggregates can be mixed in a proportionate ratio to be used in pavement and building construction. Various strength tests ...

RA can be obtained after crushing and screening of the construction rubble obtained from demolished structures. The recycled coarse aggregate (RCA) used in this work is obtained from STA (The stanbul Environmental Protection and Waste Processing Corporation) to replace the natural coarse aggregates (NCA) in different proportions.

 · The amount of recycled coarse aggregate used in this research is approximately 125 kg. Many researchers state that recycled aggregates are only suitable for non-structural concrete application. This research, however, shows that the recycled aggregates that are obtained from concrete specimen make good quality concrete.

 · Recycled aggregate is made up of crushed cement, asphalt, and granite. When a building is torn down or demolished, aggregate materials are collected from the waste, left behind at the demolition site. The resulting recycled aggregate can then be reused in projects, such as railroad track ballast, road surfacing, road construction, water ...

2  · Recycled Aggregate can be used in the following constructions. Can be used for constructing gutters, pavements etc. Large pieces of crushed aggregate can be used for building revetments which in turn is very …

The replacement of recycled aggregate on concrete will decrease the characteristic Strength. In the context of Batch 1, the characteristic Strength for 0% was 29.58 MPa, 35% Recycled Aggregate was 27.27 MPa, 50%. Recycled Aggregate was 25.27 MPa and 65% Recycled Aggregate was 23.08 MPa. Then, in terms of Batch 2, the characteristic …

1.Size of Coarse Aggregates: The size of the coarse aggregate depends on the use of the concrete is to be poured. For large-scale concreting operations without complex reinforcement, large aggregates of size 80 mm, 40 mm, 20 mm are used. For the simple construction of residential or other buildings, 20 mm is the maximum size will be used.

 · According to infrastructure's demand, however, the use of recycled coarse aggregate (RCA) as a replacement for natural aggregate and CCA is beneficial to the …

 · The thoughtful utilization of natural resources in construction practices and the usage of recycled materials in the production of concrete can be a solution. In this experimental study, the behavior of recycled aggregate concrete (RAC) incorporating recycled coarse (RC) aggregate is examined.

In this test the recycled coarse aggregate replacement ratio is 30%, by using recycled coarse aggregate which through high quality processing replaces ordinary coarse aggregate and adding PVA fiber (the mass of PVA fiber respectively are 0%, 0.5%, 1.0% and 1.5% of the cement), the influences of PVA fiber on the strength, effective porosity and ...

 · An important aspect of sustainable construction is the recycling or reuse of the construction and demolition (C&D) waste to maintain a friendly green environment. The wide range of building materials and its compositions inhibit the efficient waste management and complete recycling after demolishing.

These have the origin from the precast concrete and test specimens. The CDW composition depends upon the type of demolition waste as well as the type of aggregate used for that …

 · This construction waste could be reused as recycled coarse aggregate [ 3 ]. Compared with natural aggregate, recycled aggregate has sharper edges, rougher surface, higher water absorption, and lower density, which …

 · Advantages of Recycled Concrete Aggregate 1. Decreases the cost of construction. 2. Preserve natural resources. 3. It is a high water absorption capacity. 4. It is regarded as green construction material. 5. Disadvantages of Recycled Concrete Aggregate 1. It downgrades the quality of concrete. 2. Workability of concrete is decreased. 3.

 · IS 383: 2016, Coarse and fine aggregate for concrete specification (3rd Revision) Google Scholar Behera M, Bhattacharyya SK, Minocha AK, Deoliya R, Maiti S (2014) Recycled aggregate from C&Dwaste & its use in concrete—A breakthrough towards sustainability in construction sector: a review. Constr Build Mater 68:501–516.

 · Using multilinear correlation analysis, the influences of these aggregate characteristics and other parameters on the properties of recycled aggregate concrete …

A typical construction and demolition waste aggregate is said to have 65-70% of major coarse as well as fine aggregates, with 30-35% of cement paste. Table-1: Composition of different materials in construction wastes as per Coelho and de Brito 2011 Different Classification of Recycled Aggregates from the construction and demolition waste

 · It has been observed that the recycled coarse aggregate is used as normal aggregate. The workability of the concrete is increased by using RCA. Maximum …

 · M-Sand is used as fine aggregate in control mixes concrete. Natural Coarse Aggregates (NCA) consist of 53.4% passing 20 mm and retained on 12.5 mm sieves and 46.6% of 12.5 mm down size, all in aggregates with fineness modulus of 8.92. 4.3 Recycled Aggregates (RA)

 · The modulus of elasticity of concrete made with recycled coarse and fine aggregate is lower than that of concrete made with recycled coarse aggregate only. ... Decreases the cost of construction. 2. Preserve natural resources. 3. It is a high water absorption capacity. 4. It is regarded as green construction material. 5. Disadvantages of ...

 · Wen et al. [] evaluated the effects of using recycled aggregate in new concrete pavement and found that replacement of natural coarse aggregate with RCA till 45 percent by volume showed negligible effects on concrete properties but suggested that for new cement concrete pavement construction RCA can be productively replaced with a part of …