Recycled Aggregate: A Viable Solution for …
2.1. Application in Concrete. C&DW can be used in concrete as coarse/fine aggregate and a finely ground material (i.e., filler). Concerning aggregate, Robalo et al. …
(PDF) Recycled concrete with coarse recycled aggregate
concrete properties. This review focuses on structur al RC made with coarse r ecycled aggrega te from concrete waste. The main. objective is to pro vide a state of the art report on RC' s ...
(PDF) Recycled aggregates in concrete …
The optimum percentage of replacement of natural coarse aggregate with treated recycled coarse aggregate is also found out based on compressive strength. It suggests that treatment using fly ash ...
(PDF) NON-CONVENTIONAL COARSE …
An artificial aggregate, the plam kernel shell obtained from palm nut, can be classified as organic lightweight aggregate.Tests on the concrete made with this material as coarse aggregate, show a ...
Mechanical and Freeze-Thaw Durability Properties of Recycled Aggregate
The influence of recycled coarse aggregates (RCAs) on the fresh, hardened, and freeze-thaw durability properties of recycled aggregate concrete (RAC) is investigated in the research reported in this paper. Four different mixes were considered with natural aggregate and three different replacement levels of RCA [i.e., (1) 30%, (2) 40%, and (3) …
Environmental and Economic Life Cycle Assessment of Recycled Coarse …
The incorporation of recycled aggregates in concrete not only reduces the extraction of natural resources, but also decreases landfill disposal of construction and demolition waste. ... and applies this methodology in a real context pertaining the procurement of coarse aggregates to ready-mix concrete plants. A case study of two …
Recycled Aggregates for Concrete Production: State-of …
Great Britain In Great Britain the normative distinguishes two types of recycled aggregates, RCA and RA, the former coming just from concrete-based material, characterized by a limitation of about 5 % in masonry content (in weight), and the second from a mixed waste. The complementary UK Standard to EN 206-1, BS 8500-2 2015 [], …
Hardened properties of 3D printed concrete with recycled coarse aggregate
(For example, RAC-100: recycled coarse aggregate concrete with a 100 % replacement ratio.) 2.3.4. SEM test. The micromorphology of the old mortar and the new mortar was analyzed by SEM. The equipment used was a Quanta 600 FEG with a resolution of 1 nm and magnification of 100 to 400,000 times. SEM samples were …
Effect of epoxy resin surface-modified techniques on recycled coarse …
Recycled coarse aggregates. The RCA used in this research came from the site of a building demolition project. With sizes of 300–600 mm, the RCA (excluding steel reinforcement) was recrushed by a jaw crusher to control the size range from 5 to 30 mm. Screens were used to divide the crushed RCA into components with 5–10 mm, 10–20 …
Pore structure and durability of green concrete containing recycled …
The mineral compositions of brick powder and concrete powder were shown in Fig. 3.The main mineral compositions of brick powder were quartz (SiO 2), feldspar and hematite; The main mineral phases in concrete powder were calcite (CaCO 3), SiO 2, hydration product Ca(OH) 2 and incompletely reacted C 2 S. The characteristic …
Effects of bacterial consortium enhanced recycled coarse aggregates …
The strength and durability properties of the recycled aggregate concrete (RAC) have been affected by the cracks and the weak interfacial transition zone (ITZ) of the recycled coarse aggregates (RCA). However, the mechanical and physical features of RCA can be improved by microbially induced calcite precipitation (MICP).
Self-compacting concrete with recycled coarse aggregates …
This means that recycling waste into coarse aggregate would contribute significantly to reduction of the waste. This resulted in studies on SCC with RCA (Recycled Coarse Aggregate) – the combination of Recycled Aggregate Concrete (RAC) with its ability to self-consolidate (Fig. 1 a).
Reducing Environmental Degradation from …
This paper examined the potential of recycled aggregate use in Ghana and concluded that concrete rubbles from demolished concrete structures and Air Cooled Blast Furnace Slag (ACBFS), a waste...
Top 5 Quarry Companies in Ghana (2023) – Prices …
Aggregates for Concrete; Aggregates for Road Base Materials; Asphaltic purpose chippings; Sea Defense Boulders; Drainage Channels; Eastern Quarries Limited …
Recycled Aggregate Concrete Hollow Block as a Sustainable …
The carbon emission per unit hollow block could be 2.5 to 2.7 kgCo 2 if 50% of the cement was replaced with coal ash and 90% of the natural aggregate was replaced with recycled coarse aggregate. 5. Recycled aggregates combined with coal ash can be used to create grade A hollow masonry units with sufficient characteristic strength, …
Micro-structural analysis of recycled concretes made with recycled
This paper investigates the microstructure of recycled concrete (RC) containing recycled coarse concrete aggregates (RCA) using scanning electron microscopy (SEM). In this study, the effect of replacement of RCA along with the use of cementitious materials (CM's) including micro-silica (SF), fly ash (FA) and natural …
Enhancing the quality of recycled coarse aggregates by …
The adherence of mortar on the surface of RCA affects the mechanical and durability properties of the recycled aggregate concrete (RAC) (Abdulla 2014, Dhir and Paine 2007, Xu and Shi 2000, Ho et al. 2013, Otsuki et al. 2003, Katz 2004, Revathi et al. 2014, Saravanakumar and Dhinakaran 2014, Juan De and Gutiérrez 2009).Puthussery et …
Study on the sulfate freezethaw resistance of recycled coarse aggregate
The cement used is ordinary Portland cement (P·O 42.5) produced by a local cement plant. The density of cement is 3.15 g/cm 3, the initial setting time and final setting time are 142 min and 198 min, respectively, and the compressive strength of 3d and 28d are 28.2 MPa and 48.7 MPa respectively.The sand used is the washed medium sand of the …
Influence of service time of recycled coarse aggregate on …
2.1.3 Recycled coarse aggregates. RACs selected in the study were gathered from three sources. One source was the 1-year-old laboratory waste concrete (collected from tested full-scale RC beams) with a w/c value of 0.45 and with a 150 mm 3 cubic compressive strength f cu150 of 37.5 MPa (called as RCA1). The other two …
A critical review and assessment for usage of …
Concrete is a composite material made up of cement, sand, course aggregate and water, and is used for construction. Cement alone has a world production …
Recycled Concrete Aggregates: A Review
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AN EXPERIMENTAL INVESTIGATION USING …
WEBThis research study investigates the effect of using recycled coarse aggregate (RCA) as a substitute of natural coarse aggregate (NCA) on the mechanical …
(PDF) NON-CONVENTIONAL COARSE AGGREGATE …
In the Ghanaian construction industry, coarse aggregates are obtained solely from natural rock deposits to produce concrete. This practice puts undue pressure on natural rock …
(PDF) Behaviour of Recycled Coarse Aggregate …
The Recycled Coarse Aggregate (RCA) content was also varied from 0 to in steps of 25. It was found that the addition of 5% (by weight of cement) nano silica to CRCA improved workability ...
A Comprehensive Review on Recycled Aggregate …
This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and …
Enhancing the quality of recycled coarse aggregates by …
Enhancing the quality of recycled coarse aggregates by different treatment techniques-a review. Environ Sci Pollut Res Int2021 Nov;28 (43):60346-60365. doi: 10.1007/s11356-021-16428-3. Epub 2021 Sep 15. Jagan Sivamani, Neelakantan Thurvas Renganathan, Saravanakumar Palaniraj. 34528204. 10.1007/s11356-021-16428-3.
Mechanical Properties of Recycled Coarse Aggregate (RCA) Concrete
The recycled concrete families were created by replacing parts of the natural aggregates forming families of concrete with 0%, 20%, 50%, and of aggregates from recycled sources.
(PDF) Recycled Glass Concrete: Coarse and Fine Aggregates …
Recycled waste glasses were used as coarse. and fine aggregates replacement in concrete. Coarse. aggregates were replaced with Green Bottles coarse aggregates. at th ird, h alf, two thirds, and ...
Behaviour of Recycled Coarse Aggregate Concrete: Age …
Recycled Coarse Aggregate (RCA) concrete construction technique can be called as 'green concrete', as it minimizes the environmental hazard of the concrete waste disposal. Indian standard recommends target mean compressive strength of the conventional concrete in terms of water cement ratio (w/c). The present work is an …
Static size effect of recycled coarse aggregate
To this end, a synthesis of experimental studies with different recycled coarse aggregate (RCA) substitute rates (0%, 30%, 50%, 70% and ), different prismatic sizes of 70 × 70 × 210, 100 × 100 × 300, 150 × 150 × 450 and 200 × 200 × 600 mm are carried out to investigate the size effect of RAC with consideration of the …
Recycled Concrete Aggregate
19.2.1 Recycled concrete aggregate (RCA) Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006). In designated concrete RC20/25 to RC40/50, RCA can automatically ...