Park the work reported here was jointly funded by the building research levy and the foundation for research, science and technology from the public good science fund. The third part of the paper gives research on durability of rac. The american concrete institutes committee 555, concrete with recycled materials has produced aci 555r01, report on removal and reuse of hardened concrete, and is working on a new report on concrete with recycled materials as aggregate. View and download powerpoint presentations on recycled aggregate concrete ppt. Figure 8 reports the chloride diffusion of the concrete with rca from vancouver.
Green concrete is a revolutionary topic in the history of concrete industry. This version of concrete is made up from the mix of the industrial waste and inorganic polymer. The recycled aggregate concrete compared well with the natural. Higher absorption rates are indicative of higher volume fractions of old cement mortar adhering to the virgin aggregate particles in the original concrete. This study evaluated the use of recycled concrete as coarse aggregate in new concrete pavements. The range of water absorption in rca used as coarse aggregate is 3. This dissertation has investigated recycled concrete aggregates in. 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.
Figure 3 shows different fractions of recycled aggregate, pro. Green concrete seminar ppt construction aggregate concrete. Crushed returned concrete as aggregates for new concrete. The aggregates are categorized by size as coarse and fine 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. 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 construction and demolition concrete waste as.
Properties of recycled concrete aggregates recycled concrete aggregates rca have higher water absorption rates than virgin aggregates. Warning by ipcc report co2 emissions must be reduced by 85 50% by 2050 compared with the. A study on the properties of recycled aggregate concrete. A lot of research has already been done on the mechanical properties of recycled aggregate concrete. Olorunsogo, early age properties of recycled aggregate concrete, in. In addition to the defence estates project method drem, the. A thorough analysis of the data has been made, leading to a guide to the production and evaluation of recycled concrete aggregates as well as. The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed.
Evaluation of recycled concrete for use as aggregate in. Recycled aggregates in concrete aggregate research. Concrete made with such recycled concrete aggregate is called recycled aggregate concrete rac. The other name for green concrete is resource saving structures with reduced environmental impact for e.
Pdf use of recycled concrete aggregate in concrete. Use of recycled aggregates in concrete a paradigm shift. J1992, recycled aggregate and recycled aggregate concrete, recycled ofdemolished concrete and masonary, rilem report no. A project report on behaviour of concrete by partial replacement of coarse aggregate with recycled plastic granules. Research report environmental suitability of recycled concrete aggregate in highways project title. Astm class c fly ash, and waste plastic highdensity poly. In the procedure shown in 12, the coarse recycled concrete aggregates were kept immersed in hcl with a molarity of 0. Recycled concrete aggregate rca is generally produced by twostage crushing of demolished concrete, and screening and removal of contaminants such as reinforcement, paper, wood, plastics and gypsum. Performance of recycled aggregate concrete for m40 grade. It is called recycled aggregate which can be produced by concrete crusher. Meanwhile, the alkalinity of recycled aggregate concrete, chloride and sulphate contents of recycled aggregate have not been adversely affected. The use of recycled concrete pavement eliminates the development of.
Recycled glass aggregate concrete decor magazine vol. This effect of rapid urbanization is also seen in construction industry. Recycled aggregates and recycled aggregate concrete second. Strength and durability evaluation of recycled aggregate. Proceedings of the national seminar on pcc pavement recycling and rehabilitation, st louis, missouri, usa, 2730 september 1981. Acceptable properties of aggregates are an elemental base for concrete quality. Basic changes in all aggregate properties were determined and their effects on concreting work were discussed at length. Therefore, in terms of applying recycled aggregate for concrete, there have been. This paper discusses the suitability of producing concrete with 100 % recycled aggregate to meet durability and strength requirements for different applications. Concrete is the favourite choice as a construction material among civil engineers around the globe for decades. Concrete is 100% recyclable recycled concrete aggregate rca can be used in. Therefore, the use of alternate aggregate is desirable.
World is growing and urbanising at a very fast rate and so is india. Only a few researchers have utilized rca for making highstrength concrete. Mechanical behaviour of concrete with recycled aggregate, 2nd workshop on the new boundaries of structural concrete, italy, 5562. Pdf recycled aggregate concrete as structural material. Ra is used to replace natural aggregate na as coarse aggregate in concrete mixes. This report is a part of the project nerema advanced solutions for recycling. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. It was observed that the addition of 5 % silica fume to concrete with 50 % recycled aggregate was subsequently accompanied by 4. Project program funded by ministry of land, infrastructure, and.
Concrete solutions for sustainability in pavements and. 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. The utilization of recycled aggregate ra in highstrength concrete has been restricted to 2530% only because of its poor quality. 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. It also compares these properties with natural aggregates. Due to the fact that recycled aggregate has a proportional mortar which attached to aggregate, it gives a higher porosity and a lower strength to rac than the normal concrete. Recycled concrete using recycled aggregate class l. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm h in.
At the moment i am in the imperial college london, department of civil and environmental engineering working on lowcarbon materials. Seminar ppt on green concrete construction aggregate. The use of local and recycled aggregates is desirable as it can reduce transportation and fuel cost and support sustainable development. Use to produce recycled aggregate concrete incorporating milled. Project 18 final report recycled materials resource center. Snyder, tara cavalline, tom yu, and peter taylor 8. Green concrete seminar ppt with pdf report study mafia. For information on recycling asphalt pavement into new asphalt pavement. This led to some changes in the standard for various applications. However, with urbanisation comes the moral responsibility of sustaining the environment. The most commonly used way to produce green concrete is by using the industrial waste products such as fly ash, blast. Explore green concrete with free download of seminar report and ppt in pdf and doc format. Similarly the properties of recycled aggregate concrete were also determined and explained here.
Use of virgin aggregates contributes about 1% of all co2 emissions from a typical cubic meter of concrete. History engrossed substitute house bill eshb 1695 passed the washington state legislature in 2015. Highlights research progress of micro and mesostructure of rac is introduced in the first part of this paper. Eliminate the expense of aggregate material imports and exports. Recycled aggregates and recycled aggregate concrete second state. An overview of study on recycled aggregate concrete in. By sagheer ahmad04620703415 sandeep meena 04820703415 sarvre azam 04920703415 shikhar singh05120703415 civil engineering v semester content. The concrete is made with concrete wastes which are ecofriendly so called as green concrete.
In major egyptian cities there is a surge in construction and demolition waste cdw quantities causing an adverse effect on the environment. The utilization of recycled aggregate is particularly very promising as 75 per cent of concrete is made of aggregates. Recycled concrete aggregate usage in the us summary report. To obtain good quality concrete using recycled aggregate it is necessary to follow the minimum requirements defined by the respective building standards. Development of design guidelines for proper selection of graded aggregate base in maryland state highways task order. Increase project efficiency and improve job cost recycled concrete aggregates. Also explore the seminar topics paper on green concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. These authorized application remain quite low risk indoor, no frost. Recycled concrete as aggregate for structural concrete. Properties of recycled aggregate concrete as affected by admixtures in original concrete, aci journal, vol.
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. Pdf the use of recycled concrete aggregate rca in concrete as partial and full. The use of such waste as recycled aggregate in concrete can be useful for both environmental and economical aspects in the construction industry. Recycled aggregate is produced by crushing concrete, and sometimes asphalt, to reclaim the aggregate. Find powerpoint presentations and slides using the power of, find free presentations research about recycled aggregate concrete ppt.
Transportation applications of recycled concrete aggregate. Pdf durability of recycled aggregate concrete miquel. Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. Green concrete is that type of concrete that is used to create the construction materials having a lesser effect on the environment. Green concrete seminar ppt free download as powerpoint presentation. Recycled construction and demolition concrete waste as aggregate. Use of recycled aggregate in concrete seminar report pdf. The extensive, but fragmented research on recycled concrete aggregates and recycled aggregate concrete, which has been carried out in various parts of the world from 1945 to 1985, has been collated to form a comprehensive stateoftheart document. Wilmot and vorobieff 1997 stated that recycled aggregate have been used in the road industry for the last 100 years in australia. Environmental suitability of recycled concrete aggregates. 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. Recycled concrete aggregate rca produced from demolished pavements in three geographicallydispersed locations in washington state were used to perform testson aggregate characte ristics, fresh concrete propertiesand hardened concrete properties. Aydilek university of maryland, college park project number sp109b4g final report for the additional task.
Construction materials are increasingly judged by their ecological characteristics. In that case, the aggregates considered are slag, power plant wastes, recycled concrete, mining and quarrying wastes, waste glass, incinerator residue, red mud, burnt clay, sawdust, combustor ash and foundry sand. Green concrete can be defined as the concrete with material as a partial or complete. The second part of this paper is devoted to the mechanical properties of recycled aggregate concrete material.
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