— Recycling technologies such as on site concrete waste crushing for road base construction and recycling concrete aggregate for non structural prefabricated concrete components are widely used Japan has a leading position in the area of concrete recycling as the establishment of comprehensive recycling law which hugely encourages concrete
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— To alleviate the environmental impacts EI produced by conventional concrete de Brito and Saikia 2012 its main constituents cement and aggregates can be replaced with more sustainable alternatives that minimize the EI Jimnez et al 2015 Turk et al 2015 Portland cement is the primary source of carbon emissions generated by
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— To effectively recycle waste petroleum products and construction waste recycling polypropylene fiber RPF and recycled aggregate can be mixed into concrete to make RPF recycled coarse aggregate RCA concrete In this study the RPF recycled from a polypropylene PP packaging belt was used as the test material and manually cut into
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— Recycling/upcycling is the most feasible solution to these streams of wastes Commonly recycling of concrete begins with crushing EoL concrete waste to produce a granular product of given particle size annex E and EN 13369 2012 contain recommendations on the use of coarse recycled aggregates in concrete ECRA 2015
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— The flow of quality control is from investigation of the original concrete to application of the recycled coarse aggregate concrete Quality control is carried out according to the construction specification & manufacturing guidelines for recycled coarse aggregate concrete Quality control covers the three respective processes for the material
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— This study presents an innovative approach for waste concrete recycling using water jet impact WJI method The liberation behavior of coarse aggregates subjected to WJI is discussed; the properties of the recycled concrete aggregate RCA are characterized; and the reuse performance of RCA is evaluated Results show that high
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— The properties of recycled coarsee aggregates from repeatedly recycling waste concrete were determined In this study five series of concrete mixtures using coarse and fine natural aggregates were prepared which have the same objective slump value from 35mm to 50mm and different compressive strengths ranging from 25MPa to 60 MPa
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— Addressing the increasing demand for concrete due to advancements in the construction sector and population growth this research explores the critical intersection of waste management and sustainable construction practices By incorporating recycled coarse aggregate RCA derived from construction and demolition waste into concrete
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— Concrete waste CW recycling stands as a promising strategy to promote sustainable construction practices This research aims to assess the feasibility of using recycled concrete aggregates RCA as a surrogate for natural aggregates NA in concrete applications and reduce the environmental impact associated with the depletion of natural
— The RCA has a higher porosity when compared to the NCA due to the development of micro cracks within the old adhered mortar as a consequence of the crushing process [] Moreover the RCA has more interfacial transition zones ITZs between the original natural aggregate and the old adhered mortar as shown in Fig
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— As building construction speeds up demolitions will increase due to concrete s limited lifespan ultimately ending in demolition In earthquake prone countries like Nepal buildings may collapse during earthquakes leading to the disposal of bricks creating potential environmental pollution This research explores the use of Crushed Brick
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— Only the chipping of concrete according to type 1 and type 2 as defined in the above standard can be used for concrete production Type 1 RA can be associated to a RCA it contains at least 90 % of concrete and natural aggregates not more than 10 % of clinker non pored bricks sand lime bricks less than 2 % of other mineral materials and
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— According to the obtained result it was found that the et al 444 increase in the percentage of recycle coarse aggregate the workability compressive strength and tensile strength results
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— The specific purpose was to study the mechanical performance of concrete designed with incorporation of coarse recycled aggregates from three successive recycling cycles at two replacement ratios 25% and 100% comparing it with that of a reference concrete a mix with the same composition but where all aggregates are natural
— International Journal of Advances in Engineering & Technology Nov 2014 ©IJAET ISSN 22311963 1522 Vol 7 Issue 5 pp 1522 1530 EXPERIMENTAL INVESTIGATIONS OF COARSE AGGREGATE RECYCLED CONCRETE Prasada Rao1 and Sindhu Desai2 1Professor Department of Civil Engineering SVUCE
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— Wang et al [142] reported that concrete with natural coarse aggregate and 100% fRCA had the elastic modulus reduced by % for concretes using while the decrease ranged from to % for concrete with 50% coarse recycled concrete aggregates and 100% fRCA Pereira et al
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— The coarse aggregates obtained by different crushing mechanisms jaw and impact crushers show very similar characteristics in terms of binder content assessed by acid leaching and wt % water absorption and wt % and porosity and vol % Thus it is not possible to conclude that any of these mechanisms are
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— Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete SC The dosages of cement water sand and coarse recycled concrete aggregate CRCA are the same as the corresponding components in natural concrete but the CRCA should be
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— The review study yielded the following findings in regards to concrete material properties 1 replacing NA in concrete with RCA decreases the compressive strength but yields comparable
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— This study presents a liberation process for recycling high quality coarse aggregates from waste concrete by impacting with steel grits Considering the mortar liberation ratio and specific energy
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