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2020-5-28 · Recycled aggregate concrete is the name given to the concrete having coarse aggregates taken from "old concrete" i.e. which obtained from demolition work and that from laboratory waste. It involves number of operations in manufacturing of recycled aggregates. The basic operations are separation, crushing, separation of ferrous elements, screening, …
2021-11-10 · A jaw crusher machine was used to extract the recycled aggregates of required sizes. ... For RAC-50 columns, a significant decrease in peak load was observed compared to natural aggregate reinforced concrete columns. However, RAC-100 columns exhibited the minimum peak load achieved among all the specimens tested.
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2018-7-19 · Raw materials and combination ratio of RAC are same with our previous study (Lu et al., 2014).Raw materials used for RAC specimens are (1) RCA taken from waste concrete of a Mianyang road at KeDa Street, the design strength of this waste concrete is unclear, and the waste concrete is broken by a jaw crusher, graded and cleaned to RCA of diameters from 10 …
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Dec 01, 2013· Under this condition, fresh recycled aggregate concrete (RAC) requires more water than natural aggregate concrete (NAC) for mixing, which probably lead to high porosity in concrete. Otherwise, because of the old cement paste adhered, the interfacial zone between new cement mortar and aggregate in RAC is usually weaker than that ...
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2021-11-4 · A jaw crusher is used to crush the DC samples into 20 mm and 10 mm aggregate for producing RA and RAC which properties are investigated. Six groups of RA properties: i) particle size distribution; ii) particle density; iii) porosity and absortion; iv) particle shape; v)
2021-12-2 · Moreover, Ulsen et al. reported that the residual mortar content, density, and particle size distribution of RCA produced by the jaw crusher and impact crusher were similar. However, the influence of the crusher type on the aggregate may vary due to …
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2012-8-24 · Working characteristics of cone crusher: 1) Movable cone rotates continuously, and the material crushing process and the unloading process works alternately along the work surface, which realizes the high output. 2) The materials are pressed, bent and sheared in the two cones, and can be easily crushed; lower power consumption.
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In other word, 3S consisted of an additional jaw crusher compared to 2S crushing. Likewise, 4S crushing had primary, secondary, tertiary and quaternary crushers as …
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2020-7-16 · The jaw crusher produces aggregates with a more constrained grain size range 0 20 40 60 80 100 1 10 100] Particle size [mm] Impact crusher - Reference ... High water demand of RAC The higher the mortar content is, the higher the …
2022-1-1 · The jaw crusher was used for crushing original concrete (Fig. 2c) to a greater degree with a maximum size of 25 mm. Further, RCA was mechanically sieved and graded into FRCA (size <4.75 mm) ( Fig. 2 d) and CRCA (nominal sizes of 10 mm and 20 mm) within the gradation limit of IS 383 [ 22 ] and to achieve a similar fineness modulus as that of NA.
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2019-12-11 · Then, using a jaw crusher and adjusting its opening size to match the maximum size of the aggregate used in the parent concrete, recycled aggregates were produced to be used in making RAC specimens. The details of the concrete specimens made using RCA are included in Table 2.2. Table 2.1: Details of Parent Concrete (Padmini et al., 2009)
Recycled aggregate concrete (RAC) is expected to a sustainable solution to alter the aggregate concrete (VAC) in structural use. While it is able to address environmental issues for both aggregate (VA) consumption and waste generation, not so many studies quantify the environmental burdens through life cycle assessment (LCA).
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2020-1-28 · prior to placement. The material is first crushed in a jaw crusher that breaks the steel from the material and provides an initial crushing of the concrete.(7) The material is sent down a picking belt where the steel is removed from the material.(2) The remaining concrete material is further crushed and screened to a predetermined gradation.(7)
Double joggle jaw crusher make Sket, type PSB 10S, opening 1000 x630 mm, built in 1969 horizontal impact crusher Wageneder , type HSB 125/112 F, year of construction 2003 1-deck eccentric screening machine Haver Niagara 1400 x 4000 mm, built in 1993 1-deck circular oscillator Krupp 1300 x 3000 mm, built in 2001
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initially crushed using a jaw crusher. The pollutions and steel remains were removed. Then, the material was sieved to produce the recycled aggregates of two fractions: 2–4 mm and 4–8 mm, characterized by density 2410 kg/ m3 and 2475 kg/m3, respectively. The aggregate used was processed in a laboratory.
2018-4-20 · Aggregate (RAC) performs compared with conventional concrete. A correct mix design and the introduction of differently shaped aggregates and different super plasticizers can influence structural concrete''s performance ... Primary crushing using a jaw crusher A primary and secondary crushing, the later with an
2020-5-7 · In order to study the capillary water absorption characteristics of recycled concrete (RAC) with different replacement rates of recycled coarse aggregate (0, 20%, 40%, and 60%) in freeze-thaw environment, the standard test method of measuring the water absorption of hydraulic cement concrete (ASTM C1585-13) was adopted, and the influence mechanism of freeze …
2018-12-14 · RAC is quite similar performance with 10mm and 14mm size of natural aggregate (NA) in natural aggregate concrete ... jaw crusher where it is broken down into required sizes. The crushed materials are sieved using a vibrator sieve in order to obtain aggregate with the sizes of 10mm, 14mm and 20mm. ...
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