Recycled Concrete as Aggregate for Structural Concrete Production
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In this article, a comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the context of load testing of reinforced concrete beams made of the investigated concrete types.Abstract:
A comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the paper. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes and precast concrete columns. Three types of concrete mixtures were tested: concrete made entirely with natural aggregate (NAC) as a control concrete and two types of concrete made with natural fine and recycled coarse aggregate (50% and 100% replacement of coarse recycled aggregate). Ninety-nine specimens were made for the testing of the basic properties of hardened concrete. Load testing of reinforced concrete beams made of the investigated concrete types is also presented in the paper. Regardless of the replacement ratio, recycled aggregate concrete (RAC) had a satisfactory performance, which did not differ significantly from the performance of control concrete in this experimental research. However, for this to be fulfilled, it is necessary to use quality recycled concrete coarse aggregate and to follow the specific rules for design and production of this new concrete type.read more
Citations
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Recycled aggregate from C&D waste & its use in concrete – A breakthrough towards sustainability in construction sector: A review
TL;DR: A brief status of recycled aggregate concrete made from recycled aggregate, summarizes and critically analyses some of the most important research findings over the past few years regarding the material aspects is given in this article.
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A review of recycled aggregate in concrete applications (2000–2017)
Vivian W.Y. Tam,Vivian W.Y. Tam,Mahfooz Soomro,Ana Catarina Jorge Evangelista,Ana Catarina Jorge Evangelista +4 more
TL;DR: In this paper, the authors reviewed the literature on the production and utilisation of recycled aggregate in concrete, concrete pavements, roadway construction, and other civil engineering works and some discussion on the savings on CO2 emissions have been included.
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A critical review and assessment for usage of recycled aggregate as sustainable construction material
TL;DR: In this paper, the authors provide an account of properties of concrete prepared with recycled aggregate, analyses the important findings on Recycled Aggregate Concrete (RAC) in the recent time and discusses the suitability of its usage in construction.
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Production of geopolymeric binder from blended waste concrete powder and fly ash
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An investigation on mechanical and physical properties of recycled aggregate concrete (RAC) with and without silica fume
TL;DR: In this article, demolished-building-rubble is used as recycled aggregate (RA) with and without silica fume (SF) in concrete mixtures, and the mechanical properties of the concrete specimens such as compressive strength, tensile splitting strength and elasticity modulus, and physical properties of concrete specimens, such as density and water absorption ratio are determined.
References
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Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading
TL;DR: In this article, the compressive strength and the stress-strain curve (SSC) of recycled aggregate concrete (RAC) with different replacement percentages of recycled coarse aggregate (RCA) are investigated experimentally.
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Mechanical behaviour of concrete made with fine recycled concrete aggregates
Luís Evangelista,J. de Brito +1 more
TL;DR: In this paper, the use of fine recycled concrete aggregates to partially or globally replace natural fine aggregates (sand) in the production of structural concrete is discussed, and the results of the following tests are reported: compressive strength, split tensile strength, modulus of elasticity and abrasion resistance.
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Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete
TL;DR: In this article, the influence of moisture states of natural and recycled aggregates on the properties of fresh and hardened concretes was investigated, and the results suggested that an AD aggregate that contains not more than 50% recycled aggregate is optimum for producing normal strength recycled aggregate concrete.
Journal ArticleDOI
Properties of concrete made with recycled aggregate from partially hydrated old concrete
TL;DR: In this article, a 28-day compressive strength of 28 MPa concrete was used as a source of aggregate for new concretes, simulating the situation prevailing in precast concrete plants.
Journal ArticleDOI
Performance of concrete made with commercially produced coarse recycled concrete aggregate
TL;DR: In this paper, performance tests have been carried out for fresh and hardened properties of concrete made with commercially produced coarse recycled concrete aggregate and natural fine sand, and the results indicate that the difference between the characteristics of fresh-and hardened recycled aggregate concrete and natural aggregate concrete is perhaps relatively narrow than reported for laboratory-crushed recycled aggregatecrete mixtures.