Use of recycled aggregates in concrete a paradigm shift. Recycled concrete aggregates rca contain not only the original aggregates, but also hydrated cement paste. One of the major challenges of our present society is the protection of environment. In general, the reuse and recycle of construction waste is concentrated in the preparation of recycled aggregate for concrete. Green concrete is that type of concrete that is used to create the construction materials having a lesser effect on the environment. Properties of recycled aggregate 510mm not less than 10mm no 1st 2nd 3rd water absorption % recovery percentage % recycled fine aggregate recycled coarse aggregat e powder size of supplied concrete lumps sand gravel cement paste no 1st 2nd 3rd original concrete number of crushing treatment number of crushing treatment. Strength variation of concrete produced from recycled aggregate is higher than concrete made from natural aggregate. Ra is used to replace natural aggregate na as coarse aggregate in concrete mixes. Files download recycled concrete aggregate powerpoint presentation free one of the major challenges of our present society is the protection of environment some of the important elements in this respect are the reduction of the consumption of energy and natural raw materials and consumption of waste materials.
In this paper, the permeability properties of fine recycled aggregate concrete are presented. The unique properties of recycled aggregates provides, superior compaction and constructability. Literature survey limbachiya and leelawat 2000 found that recycled aggregate concrete had 7 to 9% lower relative density and 2 times higher water absorption than natural aggregate. This paper focuses on coarse rca which is the coarse aggregate from the original concrete that is created after the mortar is separated from the rock. Meanwhile, the alkalinity of recycled aggregate concrete, chloride and sulphate contents of recycled aggregate have not been adversely affected. In this paper, the effects of various percentages 0%, 25%, 50%, 75%, 100% of recycled aggregate ra on compressive strength of recycled aggregate concrete rac were investigated.
Files download recycled concrete aggregate powerpoint presentation free. It is called recycled aggregate which can be produced by concrete crusher. For the recycled aggregate concrete, it would be necessary to add more cement in concrete made with 100% of recycled aggregate in order to achieve the same workability and compression strength as conventional concrete. This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Concrete recycling gains importance because it protects natural resources and eliminates the need for disposal by using the readily available concrete as an aggregate source for new concrete or pavement subbase layers. Recycled aggregate occurs as either recycled concrete aggregate rca or recycled asphalt pavement rap. There are many testing based on the recycled aggregate have been carried out all around the world. The slump of recycled aggregate concrete is more than the normal concrete. In this study, total 90 cylinders and 5 beams were prepared with stone aggregate and 5%, 10%, 15% and 20%. Ppt batching effects on properties of recycled aggregate. According to bodin and zaharieva, precautions must also be taken of pathological reactions such as alkali aggregate reaction and sulphate reaction in the.
I would like to express my gratitude to all those who gave me the possibility to complete this project. Pdf recycled aggregate concrete as structural material. Recycled aggregate concrete is in close proximity to normal concrete in terms of split tensile strength. This version of concrete is made up from the mix of the industrial waste and inorganic polymer. A healthy and sustainable reuse of plastics offers a host of advantages. However, to date limited research exists exploring the use of coarse rca in scc. Replacement of conventional aggregate by recyled aggregate. Recycled concrete aggregate powerpoint presentation. Replacement of recycled coarse aggregates with natural coarse aggregates in concrete. The most commonly used way to produce green concrete is by using the industrial waste products such as fly ash, blast. Strength and durability evaluation of recycled aggregate.
Bulk density of aggregate the bulk density of the recycled aggregate, due to a higher porosity of mortar layer, has a lower value than the bulk density of natural aggregates and. This creates substantial garbage every day which is much unhealthy. The utilisation of recycled concrete aggregate rca in selfcompacting concrete scc has the potential to reduce both the environmental impact and financial cost associated with this increasingly popular concrete type. Recycled aggregate an overview sciencedirect topics. In the procedure shown in 12, the coarse recycled concrete aggregates were kept immersed in hcl with a molarity of 0.
Construction materials are increasingly judged by their ecological characteristics. Recycled aggregate self compacting concrete prashant o. In addition, the use of rca leads to a possible solution to the environmental problem caused by concrete waste and reduces the negative environmental impact of. Modani 1, vinod m mohitkar 2 1 assistant professor, b. College of engineering, pusad 445204 2 secretery, maharashtra state board of technical education, mumbai 51 abstract an experimental inves tigation was conducted on self compacting concrete with different. Recycled concrete as aggregate for structural concrete. This paper focuses on the possibility of the use of recycled aggregate concrete as a structural material. For that purpose an experimental study of the shear behaviour. In order to evaluate their potential use of recycle materials in highway construction, two different recycled concrete aggregate rca materials and two. By adding a portion of recycled aggregate instead of natural aggregate coarse into the mixture, producing the recycled concrete, which can.
Laboratory and field performance of recycled aggregate base in a seasonally ppt. The aggregates are categorized by size as coarse and fine aggregate. The fra used come from demolished concrete of known properties. The adobe flash plugin is needed to view this content. The characteristic of recycled aggregates could be different by its parent concrete because the parent concrete was designed for its purposes such as permeable, durable and high strength concrete. The work presented in this paper seeks to build on the existing knowledge in this area by. Properties of selfcompacting concrete with recycled. As interest in sustainable materials such as recycled aggregate concrete rac rises, effort, it is important to understand the properties of rac that relates to its. Recycled concrete aggregate an overview sciencedirect. Mix design for pervious recycled aggregate concrete open. After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. Recycled concrete aggregate ppt video online download. View and download powerpoint presentations on recycled aggregate concrete ppt.
Environmental suitability of recycled concrete aggregates. Replacement of conventional aggregate by recyled aggregate free download as powerpoint presentation. Files download recycled concrete aggregate powerpoint presentation free one of the major challenges of our present society is the protection of environment some of the important elements in this respect are the reduction of the consumption of energy and. The suitability of recycled plastics as coarse aggregate in concrete and its advantages are discussed here. Ppt batching effects on properties of recycled aggregate concretes for airfield rigid pavements powerpoint presentation free to download id. View and download powerpoint presentations on non destructive test for concrete ppt. The extensive research on recycled concrete aggregate and recycled aggregate concrete rac as started from year 1945 in various part of the world after second world war, but in a fragmented manner. Recycled concrete sand sustainable concrete sand solutions. Aggregate strength, gradation, absorption, specific gravity, shape and texture are some of the physical and mechanical characteristics that contribute to the strength and durability of concrete.
Use of industrial, construction and demolition waste focuses on the recent development which the use of various types of recycled waste materials as aggregate in the production. Use of recycled aggregate in concrete can be useful for environmental protection and economical terms. Some of the important elements in this respect are the reduction of the consumption of energy and natural raw materials and consumption of waste materials. Waste material based concrete powerpoint ppt presentations. Recycled glass aggregate concrete decor magazine vol. Mixes with 10%, 30%, 50% and 100% by volume replacement of fine natural aggregates fna with fra were produced and tested for water.
Recycled aggregate in concrete civil engineering community. Download as ppt, pdf, txt or read online from scribd. View waste material based concrete ppts online, safely and virusfree. The widespread use of this material has led to continuous developments such as ultrahigh strength concrete and selfcompacting concrete. Concrete is the favourite choice as a construction material among civil engineers around the globe for decades. Recycled plastics as coarse aggregate for structural concrete. This is a high school building, 35% of coarse aggregate were replaced by recycled concrete aggregate. Crushed concrete aggregates properties and uses of.
Find powerpoint presentations and slides using the power of, find free presentations research about recycled aggregate concrete ppt. First effort has been made by nixon in 1977 who complied all the work on recycled aggregate carried out between 19451977 and prepared a stateof. However, with urbanisation comes the moral responsibility of sustaining the environment. The scope of this project is to determine and compare the. By collecting the used concrete and breaking it up, recycled concrete aggregate rca is created fig. The use of plastic is increasing day by day, although steps were taken to reduce its consumption. Find powerpoint presentations and slides using the power of, find free presentations research about non destructive test for concrete ppt. Highstrength structural concrete with recycled aggregates a dissertation submitted by nelson, shing chai ngo. Hanson and torben 1986 stated that since 1945, the research on recycled aggregate had been carried out in many countries.
Concrete production using recycled waste plastic as aggregate. The use of recycled concrete aggregate materials in highway constructions as compared to the use of virgin materials reduces virgin natural resource demands on the environment. Highstrength structural concrete with recycled aggregates. Recycled aggregates in concrete aggregate research. Recycled concrete aggregates ppt download slideplayer. Recycled coarse aggregates international journal of advanced technology in civil engineering, issn. Abstractthe use of recycled concrete aggregate rca in concrete as partial and full replacements of natural coarse aggregate is growing interest in the construction industry, as it reduces the demand for virgin aggregate. Review article assessment of recycled aggregate concrete parekh d. It has been shown that the application of coarse recycled concrete aggregate, as the component materials in the con crete mixtures, it is possible to produce. Recycled concrete sand pty ltd is a dynamic innovative company based in cape town south africa. Recycled aggregate concrete is defined as concrete manufactured with waste materials in order to reduce the negative environmental impact that results from the manufacturing process of cement, achieving a more sustainable product. One of the major challenges of our present society is the protection of environment some of the important elements in this respect are. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes and precast.
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