— The use of recycled concrete aggregates as an alternative aggregate material in concrete has been studied over the past two decades It is now recognized that the recycled aggregate concrete RAC where natural aggregates are replaced with recycled concrete aggregates is a promising technology for conserving natural resources
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— Recycled Concrete Aggregate RCA is a future material towards sustainable development Since the porosity of RA is higher than the virgin aggregate the workability of the RAC mix is lower for the same water content than that of NAC The workability of RAC reduces as the replacement ratio of RA increases [29] [32] [34]
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— Literature review on the fresh properties of recycled aggregate concrete RAC • Workability stability heat of hydration air content and density were analysed • Control over the recycled aggregates manufacture is key to obtain high quality RAC • Predictable properties are achieved by adding adequate amount of compensating water
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— Old concrete and masonry that have reached the end of the road can be recycled and used not only as aggregate for new concrete but also for a number of other applications in construction [4] For example since 1982 the ASTM definition of coarse aggregate has included crushed hydraulic cement concrete and the definition of
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— ABSTRACT This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates One study examines the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties where cleanliness
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— According to Muduli and Mukharjee 2019 a higher air content value was recorded for RCA than the normal aggregate concrete However the research of Falek et al 2017 revealed that an inverse relationship exists between the density and the amount of RA in the concrete mixture As the quantity of the fine recycled aggregate increases then
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— Old concrete and masonry that have reached the end of the road can be recycled and used not only as aggregate for new concrete but also for a number of other applications in construction [4] For example since 1982 the ASTM definition of coarse aggregate has included crushed hydraulic cement concrete and the definition of
— Application in Concrete C&DW can be used in concrete as coarse/fine aggregate and a finely ground material filler Concerning aggregate Robalo et al [] observed that replacing NA with C&DW progressively increases the water or superplasticizer admixture to keep the workability of concrete due to the high porosity and water
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— Low calcium fly ash LCFA and ground granulated blast furnace slag GGBS based geopolymer concretes are eco friendly novel concrete to be used as an alternative to traditional OPC concrete Natural resources are used in the production of cement while industrial and demolished concrete wastes such as GGBS LCFA and
— Application in Concrete C&DW can be used in concrete as coarse/fine aggregate and a finely ground material filler Concerning aggregate Robalo et al [] observed that replacing NA with C&DW progressively increases the water or superplasticizer admixture to keep the workability of concrete due to the high porosity and water
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— The role of 0 2mm fine recycled concrete aggregate on the compressive and splitting tensile strengths of recycled concrete aggregate concrete Mater Des 64 2014 pp 345 354 /
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— Studies by Awoyera et al 2016 and Thomas et al 2013 investigated the performance of concrete produced with steel slag and copper tailing as aggregate respectively while Siddique et al 2008 and Meng et al 2018 in their studies explored the use of recycled waste plastic and various waste types in concrete and concrete blocks
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— In this work the effect of physical properties of recycled coarse aggregate RCA on the workability and mechanical properties of recycled aggregate thermal insulation concrete RATIC was studied Two kinds of RCAs from different concrete waste plants were studied and the density water absorption and crushing index of RCAs were analyzed
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Title Workability and Strength of Ultra High Performance Concrete Containing Nano Ca OH 2 Modified Recycled Fine Aggregates Author s Binbin Zhang Tao Ji Yu Ma Yu Yang and Yantong Hu Publication Materials Journal Volume 119 Issue 5 Appears on pages s 165 174 Keywords nano calcium hydroxide nano CH ; recycled fine aggregate
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— Keywords Recycled concrete Workability Slump test Flow test VeBe test 1 Introduction In recent years there has been a great expansion in the amount of materials used in concrete production resulting in high performance concrete fiber concrete and recycled concrete among others Because of the different behavior between recycled
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— Mechanical properties of recycled concrete with demolished waste concrete aggregate and clay brick aggregate Results Phys 9 2018 pp 1317 1322 / View PDF View article View in Scopus Google Scholar
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— mately 60 to 75% of the volume of concrete Aggregate properties significantly affect the workability of plastic concrete and also the durability strength thermal properties and density of hardened concrete This Bulletin describes types of aggregates normally used in concrete aggregate properties affecting performance of
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— Mixing and specimen preparation Table 2 displays the quantities of each element namely cement fine aggregate coarse aggregate and recycled coarse aggregate Moreover Table 2 accurately computed the optimal blend ratios for casting each design using the specified amounts of constituents in cubic meters The concrete mixture
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— Highlights Durability and mechanical properties of recycled concrete have been analysed A total of 24 mixtures at ages of 28 180 and 365 days were studied The durability is lower but for lowers water/cement ratios the loss is less The loss of mechanical properties is greater for lower water/cement ratios
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This paper describes two laboratory based experimental studies to determine some plastic and hardened properties of concrete incorporating recycled concrete aggregates One study examined the effects that the cleanliness of recycled coarse aggregate particles has on the concrete properties where cleanliness relates to the amount of cement paste and mortar
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