Recycled concrete aggregate research papers academia. C of cuttack region, about 25 years old on the properties of self compacting concrete scc and compared the results with normal vibrated concrete nvc containing 100% natural coarse aggregate nca. This is useful in reducing the environmental problems created by dumping these materials. Coarse aggregategravel classification of coarse aggregate uncrushed gravel or stone which is the result of natural disintegration and crushed gravel or stone are usually called the coarse aggregates. Replacement of recycled coarse aggregates with natural. An experimental study on concrete by using e waste as. Basic changes in all aggregate properties were determined and their effects on concreting work were discussed at length.
The recycled concrete aggregate used in this investigation is of free cost since it is the waste obtained. Characterization of recycled coarse aggregate rca via a. Recycled coarse aggregates recycled coarse aggregates. To compare the compressive strength and density of recycled plastics used as coarse aggregate for constructional concrete with the conventional concrete to know its applications in construction industry. Pdf utilization of recycled coarse aggregate in concrete. The increase in weight due to water contained in the pores of the material. 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 concrete aggregate was produced by crushing of.
Mechanical behavior of three generations of 100% repeated recycled coarse aggregate concrete. Bulk specific gravity also known as bulk dry specific gravity. 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. After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste.
Aggregate can be used in a number of ways in construction. An experimental study was carried out to investigate the properties of concrete with recycle aggregates. Recycled plastics as coarse aggregate for structural. In roads and railway ballast the aggregates are used to resist the overall static as well as. Recycling of coarse aggregates pdf compressive strength of recycled coarse aggregate rca is found to be higher than. Coarse aggregate was obtained from locally available crushed stone aggregate about 12 mm maximum of single lot size has been used trough out the experiment. Natural coarse aggregate used is microtonalite with maximum size of 25 mm. In india, a huge quantity of construction and demolition wastes are produced every year. We know the fact that volume of both aggregates should be equal.
Performance of light weight concrete using fly ash pellets as coarse aggregate replacement 99 considered for the efficiency of the production of pellet such as speed of revolution of pelletizer disc, moisture content, angle of pelletizer disc and duration of pelletization 8. The ratio of the weight in air of a unit volume of aggregate, including the weight of water within the voids filled to the extent achieved. Using low cost recycled coarse aggregates as an alternative material to. Paper open access related content effect of different.
The gradation curve of the rubber crumbs and fine aggregates used in this study are shown in fig. Coarse aggregate for use in bituminous mixtures may consist of reclaimed portland cement concrete meeting the requirements of 9015, except that the reclaimed. Evaluation of recycled concrete for use as aggregate in. Typically, coarse aggregate sizes are larger than 4. Materials are mixed by considering the proportions as per the mix design. Using multilinear correlation analysis, the influences of these aggregate characteristics and other parameters on the properties of recycled aggregate concrete were evaluated. 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 the 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. It was found that rac had lower compressive strength compared to natural.
This study evaluated the use of recycled concrete as coarse aggregate in new concrete pavements. This research also covered rac mixtures at different watercement ratio 0. Therefore, when using rca made from waste concrete, much water must be added with the concrete, and slump loss occurs when transporting. Mix design for concrete with crushed ceramic tiles as coarse.
In this paper, the permeability properties of fine recycled aggregate concrete are presented. Tests for mechanical properties of different types of recycled aggregate included crushing value and abrasion resistance. Aggregates are the most mined material in the world. Influence of crushed coarse aggregates on properties of concrete. The ratio of the weight in air of a unit volume of aggregate at a stated temperature to the weight in air of an equal volume. Issn 2348 7968 influence of recycled coarse aggregate on.
Environmental suitability of recycled concrete aggregates. Effect of recycled coarse aggregate type on concrete. Gravel is created by river erosion, resulting in smooth and rounded products. Similarly the properties of recycled aggregate concrete were also determined and explained here. Investigations on concrete with recycled concrete as. Aggregates impact on different characteristics and properties of concrete is certainly huge. Aggregate ra on compressive strength of recycled aggregate concrete rac were investigated. The workability was comparable to the control mixture, and the air content reached 6%. Gab materials contain coarse and fine aggregate particles as well as fines clay and silt. Patel institute of technology, vallabh vidyanagargujaratindia. Concrete is prepared for m20 mix designed for plain concrete. Investigations on concrete with recycled concrete as coarse. Some natural aggregate deposits, called pitrun gravel, consist. Age and successive recycling article pdf available in journal of the institution of engineers india 972.
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. Partial replacement of eplastic waste as coarseaggregate. For the this research project ordinary portland cement of grade 43, natural sand from narmada is used as fine aggregate, natural crushed aggregate is used as a coarse aggregate and crushed plastic waste of which is passed from 20 mm sieve and retained on 4. The aggregate are placed as per volume in the cubes but the specific gravity of n. As mentioned earlier, coarse aggregates are stones that are retained on 4. The mould of dimension 150x150x150 mm in 03 layers in which. In simple words it is defined as a mixture of four ingredients as coarse aggregates that form the largest proportion of the mix, fine aggregates such as sand that act. Moreover it is proved that aggregates types has the severe effect on physicmechanical properties of concrete as aggregate covered. Two conventional graded aggregate base gab materials and two recycled concrete aggregate materials were used in the current study. Properties of self compacting concrete using recycled. Properties of selfcompacting concrete with recycled coarse. Pdf behaviour of recycled coarse aggregate concrete. Ceramic tile aggregate is used as partial replacement with coarse aggregate.
Fine and coarse natural aggregates were derived from river sava and dominantly consist of quartz grains. The initial questions arising of the bond strength and the heat of hydration regarding plastic aggregate were solved. Recycled plastics as coarse aggregate for structural concrete. Investigations on concrete with recycled concrete as coarse aggregate muhammad ali. Uses of aggregates in construction, roads, railway and other. Natural fine aggregate used is river sand and rca used from demolished concrete waste from which physical test such as. Size numbers grading sizes for coarse aggregates apply to the amounts of. Research article properties of selfcompacting concrete. Specific gravities of coarse aggregate, fine aggregate and tire rubber were estimated. 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. Sciencedirect international conference on solid waste management, 5iconswm 2015 partial replacement of eplastic waste as coarseaggregate in concrete ashwini manjunath b t department of. Recycled concrete as aggregate for structural concrete. To reduce the pressure on naturally availability materials by replacing it.
As the percentage of laterite increases, there was a reduction in all these characteristics even with the particle size of coarse aggregate reduction due to loss from the aggregate paste interface zone. May 20, 2014 recycled coarse aggregate rca made from waste concrete is not a suitable structural material as it has high absorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. Pdf use of recycled concrete rubbles as coarse aggregate. Replacement of recycled coarse aggregates with natural coarse. The fra used come from demolished concrete of known properties. Conclusions based on this experimental investigation the behavior of recycled concrete aggregate and concrete was concluded as, it can be seen that recycled concrete aggregate as natural coarse aggregate has no detrimental effect on the. Pdf use of recycled concrete rubbles as coarse aggregate in. Expanded fly ash clay aggregate a sustainable alternative coarse. Review article assessment of recycled aggregate concrete.
Also, when sand was replaced by 25% of laterite, the 19. Strength of recycled concrete made from crushed concrete. Paper open access related content effect of different coarse. Based on the result of properties of recycled aggregate and natural coarse aggregate, it can be seen that specific gravity for natural coarse aggregate is higher than recycled aggregate, and the value of specific gravity for natural coarse aggregate is 2. Research article properties of selfcompacting concrete with recycled coarse aggregate w. Environmental suitability of recycled concrete aggregates in. Mar 29, 20 by collecting the used concrete and breaking it up, recycled concrete aggregate rca is created fig. These waste materials need a large place to dump and hence the disposal of these wastes has become a problem. After completions of all experimental, programs are conducted that ceramic tile aggregate can be used in place of coarse aggregate with certain percentage of replacement. Keywords recycle, construction material, coarse aggregate, demolished. Recycled coarse aggregate rca made from waste concrete is not a suitable structural material as it has high absorption of cement mortar, which adheres on the aggregate surface and on the tiny cracks thereon. At 28 days of age, the average compressive strength of the two mixtures was.
The rock is crushed into several different graded sizes for use in applications including ready mix concrete, asphalt and decorative stone. Mechanical and durability properties of recycled aggregate concrete rac made with different replacement levels of recycled coarse aggregate rca. The addition of coarse aggregate with ewaste in the range of 0%, 32%, 34%, 36%, and 38%. It also compares these properties with natural aggregates. The use of concrete rubbles as coarse aggregate is possible in normal concrete mixes. Two mixtures with 10% coarse aggregate replaced by tire chips had the best performance. Use of plastic aggregates in concrete international journal of.
Influence of crushed coarse aggregates on properties of. Research article properties of selfcompacting concrete with. Crushed stone is created through the mining and crushing of rock. By collecting the used concrete and breaking it up, recycled concrete aggregate rca is created fig. Both coarse aggregates and fine aggregates are the main constituents of concrete because they not only give the body to the concrete, it also have a significant effect on the fresh concrete based on aggregates shape, size, texture, grading and crushing type. Evaluation of recycled concrete for use as aggregate in new.
View recycled concrete aggregate research papers on academia. 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. An experimental study on partial replacement for coarse. Properties of selfcompacting concrete with recycled. Influence of recycled coarse aggregate on some properties of fresh and hardened concrete. Performance of light weight concrete using fly ash pellets as. A total of 16 sccs were produced and classified into four series, each of which included four mixes designed with two. Ra is used to replace natural aggregate na as coarse aggregate in concrete mixes. A maximum size up to 40 mm is used for coarse aggregate in most structural applications, while for mass concreting purposes such as dams, sizes up to 150 mm may be used. Mixes with 10%, 30%, 50% and 100% by volume replacement of fine natural aggregates fna with fra were produced and tested for water. Based on specific gravity and dryrodded bulk density, coarse aggregates can be classified as medium weight aggregates. This paper addresses durability and shrinkage performance of the selfcompacting concretes sccs in which natural coarse aggregate nca andor natural fine aggregate nfa were replaced by recycled coarse aggregate rca andor recycled fine aggregate rfa, respectively. Department of civil engineering, university of botswana, gaborone, botswana.
Typical values substance specific gravity density lbft3 water 1. The significant reality is that some of 7080% of the amount of concrete volume is taken by the aggregates itself. Construction aggregate is a broad category of granular raw material of different sizes sand, gravel, crushed stone, slag, recycled concrete etc used in construction. The work presented in this paper seeks to build on the existing knowledge in this area by. Partial replacement of eplastic waste as coarseaggregate in. Coarse aggregate specification coarse aggregate general. Jayeshkumar pitroda2 1assistant professor and research scholar, civil engineering department, a. Performance of light weight concrete using fly ash pellets. This paper presents the influence of different amounts of recycled coarse aggregate rca obtained from a demolished town club building of banki, n.
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 which is reused. Sciencedirect international conference on solid waste management, 5iconswm 2015 partial replacement of eplastic waste as coarse aggregate in concrete ashwini manjunath b t department of. In this research, 100% recycled coarse aggregate were used to make concrete cylinder specimen with fine aggregates of different fineness modulus fm value 1. Recycled coarse aggregates international journal of advanced technology in civil engineering, issn. To reduce the pressure on naturally availability materials by replacing it with recycled plastic aggregate. The suitability of recycled plastics as coarse aggregate in concrete and its advantages are discussed here. A healthy and sustainable reuse of plastics offers a host of advantages. Use of recycled tire in concrete for partial aggregate. Properties of self compacting concrete using recycled coarse. Owing to scarcity of coarse aggregate for the preparation of concrete, partial addition of ewaste with coarse aggregate was attempted. Natural fine aggregate used is river sand and rca used from demolished concrete waste from which physical test such as specific gravity, absorption and sieve analysis are carried out.
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