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·Thus recycled aggregate could come from demolition of concrete structures airport runways bridge supports concrete roadbed or rejected concrete products on the production line etc Concrete made using such aggregate is referred to as recycled aggregate concrete RAC
The RCA is composed of coarse recycled concrete aggregate CRCA and fine recycled concrete aggregate FRCA The CRCA is a small concrete component made up of old coarse aggregate mortar and interfacial transition zone ITZ whereas the FRCA >5 mm is made up of crushed and sieved waste concrete mortar fragments
·Recycled Concrete Aggregate A Sustainable Choice for Unbound Base ACI Fall 2015 Convention Denver Colorado November 8 2015 Cecil L Jones PE Diversified Engineering Services Inc Recycled Concrete Aggregate
·A large amount of research has been conducted on recycled aggregate concrete RAC due to its social environmental and economic significance However the in situ application of RAC has so far been mainly limited to nonstructural purposes as the performance of RAC in both the short and long term is inferior to its normal concrete
·This leads to a faster decrease in porosity over time in Recycled Aggregate Concrete RAC as opposed to Normal Aggregate Concrete NAC Gonzalez Corominas and Etxeberria Citation 2016; Kou and Poon Citation 2009; Thomas et al Citation 2013; Mas et al Citation 2012 observed that although RAC containing 100% coarse RCA exhibited higher
·This method is suitable for various types of concrete such as ordinary aggregate concrete recycled aggregate concrete RAC and fiber reinforced concrete Finite element analysis is applied to simulate stress and damage evolution in mesoscale models of concrete taking into account the effects of actual aggregate slenderness ratio concavity
·Carbonation of concrete is a process which absorbs carbon dioxide CO2 Recycled aggregate concrete RAC may own greater potential in CO2 uptake due to the faster carbonation rate than natural aggregate concrete NAC A quantitative model was employed to predict the CO2 uptake of RAC in this study The carbonation of RAC and the specific surface
·Recycled aggregate concrete RAC is inferior in mechanical and durability performance as compared with natural aggregate concrete NAC [4] By increasing the quantity of RA the mechanical performance and durability of RAC decrease compared to NAC because of the high porosity and weak ITZ of recycled aggregate [5] The weaker ITZ between the
·In the present investigation an attempt was made to study the influence of the strength of parent concrete on the properties of recycled aggregates and recycled aggregate concrete In this study four grades of normal concrete mixes M20 M25 M30 and M40 were considered as parent concrete to produce the recycled coarse aggregates and recycled
·Now after five years of weather and use the recycled concrete has proven that it can perform as well as new concrete and often better Not only that but the recycled concrete can be recycled again and used a second and third time without its target strength being compromised although the rate of strength gain is less with each use
·A field study of recycled aggregate concrete in structural and non structural element • Compressive strength and rebound hammer correlation of recycled aggregate concrete • Long term up to 5 years in situ performance of recycled aggregate concrete • The long term strength of recycled aggregate concrete was comparable to conventional
·Several review articles on LCA of recycled aggregate concrete were published recently 73 80 82 The authors dealt with basic methodological issues and the way these issues were resolved in the published research in this area Based on the reviews performed by mentioned authors some conclusions can be drawn
·The research at a microscopic level explains the strengthening effect of nano silica upon recycled aggregate concrete and lays a theoretical foundation for upcycling construction and demolition wastes Graphical abstract Download Download high res image 114KB Download Download full size image;
·Recycling concrete construction waste is a promising way towards sustainable construction Indeed replacing natural aggregates with recycled aggregates obtained from concrete waste lowers the environmental impact of concrete constructions and improves natural resource conservation This paper reports on an experimental study on mechanical and
·This study proposes the use of diatomaceous earth DE as a surface treating agent for recycled aggregate RA to enhance the performance of recycled aggregate concrete RAC The treatment process involves pre saturating the RA and applying a coating using a slurry composed of calcined DE and ordinary Portland cement at specific proportions Test
·Waste concrete with a particle size of 19 mm after crushing can be called RA The RA formed by simple treatment of waste concrete usually contains many initial defects such as a large amount of adhesive mortar and microcracks [14 15] These adhesive mortars are rough and porous resulting in greater water absorption compared to NA and the formation of a
·In recycled aggregate concrete though there may be some additional hydration compounds developed due to the reactions between old cement mortar adhered to RCA and new cement matrix still the percentage area of porosity is higher Fig Average porosity in ITZ at various ages Scrivener et al 2004
The comprehensive information presented in Recycled Aggregate in Concrete Use of Industrial Construction and Demolition Waste will be helpful to graduate students researchers and concrete technologists The collected data will also be an essential reference for practicing engineers who face problems concerning the use of these materials in
·Then the performance of recycled aggregate concrete RAC can be further enhanced by various forms of curing Meanwhile combining factors such as economic efficiency and carbon emissions it is also found that the replacement rate of RA and the transport distance are the main factors limiting the large scale application of RAC This paper
·Recycled concrete aggregate was produced from concrete waste sourced from the demolition site of a water tank The core strength of the original concrete was found to be 25 MPa The concrete waste collected was subjected to primary crushing and screened to control the particle sizes of the recycled concrete aggregate
·To offset the shortcomings of recycled aggregate concrete RAC made from recycled aggregates the application of nano materials has been proved as an innovative and highly efficient strategy This paper first discusses basic physiochemical properties and dispersibility of two typical nano materials including nanosilica and graphene oxide and
·Extensive use of cement in the construction industry increases CO2 emissions and has a negative impact on the environment In this work recycled coarse aggregate RCA from construction and demolition wastes C&DW was used to fabricate sustainable pervious concrete PC In order to mitigate the environmental hazards of excess cement waste and to
·Geopolymer concrete is a green alternative to cement production This article reviews its properties and applications with recycled aggregates
·On behalf of RILEM Technical Committee 37 DRC Nixon prepared a state of the art report on recycled concrete as an aggregate for concrete covering the period 1945 1977 [2] A second state of the art report on recycled aggregate and RAC was prepared by Hansen covering developments between 1978 and 1985 [3] And the third state of the art report was an
